Adding LITTLEFS after esp_littlefs (IDF) is built-in (#4483)

Tools idea: https://github.com/lorol/arduino-esp32fs-plugin

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,54 @@
+---
+name: Bug report
+about: Please fill in the bug report carefully
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Make your question, not a Statement, inclusive. Include all pertinent information:
+
+What you are trying to do?
+Describe your system( Hardware, computer, O/S, core version, environment).
+Describe what is failing.
+Show the shortest possible code that will duplicate the error.
+Show the EXACT error message(it doesn't work is not enough).
+All of this work on your part shows us that you have worked to solve YOUR problem. The more complete your issue posting is, the more likely someone will volunteer their time to help you.
+
+If you have a Guru Meditation Error or Backtrace, ***please decode it***:
+https://github.com/me-no-dev/EspExceptionDecoder
+
+----------------------------- Remove above -----------------------------
+
+
+### Hardware:
+Board:							?ESP32 Dev Module? ?node32? ?ttgo_lora?
+Core Installation version:			?1.0.0? ?1.0.1-rc4? ?1.0.1? ?1.0.1-git? ?1.0.2? ?1.0.3?
+IDE name:						?Arduino IDE? ?Platform.io? ?IDF component?
+Flash Frequency:					?40Mhz?
+PSRAM enabled:                                    ?no? ?yes?
+Upload Speed:					?115200?
+Computer OS:                                        ?Windows 10? ?Mac OSX? ?Ubuntu?
+
+### Description:
+Describe your problem here
+
+
+### Sketch:  (leave the backquotes for [code formatting](https://help.github.com/articles/creating-and-highlighting-code-blocks/))
+```cpp
+
+//Change the code below by your sketch
+#include <Arduino.h>
+
+void setup() {
+}
+
+void loop() {
+}
+```
+
+### Debug Messages:
+```
+Enable Core debug level: Debug on tools menu of Arduino IDE, then put the serial output here 
+```

.github/scripts/check-cmakelists.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+#
+# This script is for Travis. It checks all non-examples source files in libraries/ and cores/ are listed in
+# CMakeLists.txt for the cmake-based IDF component
+#
+# If you see an error running this script, edit CMakeLists.txt and add any new source files into your PR
+#
+
+set -e
+
+# pull all submodules
+git submodule update --init --recursive
+
+# find all source files in repo
+REPO_SRCS=`find cores/esp32/ libraries/ -name 'examples' -prune -o -name '*.c' -print -o -name '*.cpp' -print | sort`
+
+# find all source files named in CMakeLists.txt COMPONENT_SRCS
+CMAKE_SRCS=`cmake --trace-expand -C CMakeLists.txt 2>&1 | grep set\(srcs | cut -d'(' -f3 | sed 's/ )//' | sed 's/srcs //' | tr ' ;' '\n' | sort`
+
+if ! diff -u0 --label "Repo Files" --label "srcs" <(echo "$REPO_SRCS") <(echo "$CMAKE_SRCS"); then
+    echo "Source files in repo (-) and source files in CMakeLists.txt (+) don't match"
+    echo "Edit CMakeLists.txt as appropriate to add/remove source files from COMPONENT_SRCS"
+    exit 1
+fi
+
+echo "CMakeLists.txt and repo source files match"
+exit 0

.github/scripts/install-arduino-core-esp32.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+export ARDUINO_ESP32_PATH="$ARDUINO_USR_PATH/hardware/espressif/esp32"
+if [ ! -d "$ARDUINO_ESP32_PATH" ]; then
+	echo "Installing ESP32 Arduino Core ..."
+	script_init_path="$PWD"
+	mkdir -p "$ARDUINO_USR_PATH/hardware/espressif"
+	cd "$ARDUINO_USR_PATH/hardware/espressif"
+
+	echo "Installing Python Serial ..."
+	pip install pyserial > /dev/null
+
+	if [ "$OS_IS_WINDOWS" == "1" ]; then
+		echo "Installing Python Requests ..."
+		pip install requests > /dev/null
+	fi
+
+	if [ "$GITHUB_REPOSITORY" == "espressif/arduino-esp32" ];  then
+		echo "Linking Core..."
+		ln -s $GITHUB_WORKSPACE esp32
+	else
+		echo "Cloning Core Repository..."
+		git clone https://github.com/espressif/arduino-esp32.git esp32 > /dev/null 2>&1
+	fi
+
+	#echo "Updating Submodules ..."
+	cd esp32
+	#git submodule update --init --recursive > /dev/null 2>&1
+
+	echo "Installing Platform Tools ..."
+	cd tools && python get.py
+	cd $script_init_path
+
+	echo "ESP32 Arduino has been installed in '$ARDUINO_ESP32_PATH'"
+	echo ""
+fi

.github/scripts/install-arduino-ide.sh

@@ -0,0 +1,228 @@
+#!/bin/bash
+
+#OSTYPE: 'linux-gnu', ARCH: 'x86_64' => linux64
+#OSTYPE: 'msys', ARCH: 'x86_64' => win32
+#OSTYPE: 'darwin18', ARCH: 'i386' => macos
+
+OSBITS=`arch`
+if [[ "$OSTYPE" == "linux"* ]]; then
+	export OS_IS_LINUX="1"
+	ARCHIVE_FORMAT="tar.xz"
+	if [[ "$OSBITS" == "i686" ]]; then
+		OS_NAME="linux32"
+	elif [[ "$OSBITS" == "x86_64" ]]; then
+		OS_NAME="linux64"
+	elif [[ "$OSBITS" == "armv7l" || "$OSBITS" == "aarch64" ]]; then
+		OS_NAME="linuxarm"
+	else
+		OS_NAME="$OSTYPE-$OSBITS"
+		echo "Unknown OS '$OS_NAME'"
+		exit 1
+	fi
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+	export OS_IS_MACOS="1"
+	ARCHIVE_FORMAT="zip"
+	OS_NAME="macosx"
+elif [[ "$OSTYPE" == "cygwin" ]] || [[ "$OSTYPE" == "msys" ]] || [[ "$OSTYPE" == "win32" ]]; then
+	export OS_IS_WINDOWS="1"
+	ARCHIVE_FORMAT="zip"
+	OS_NAME="windows"
+else
+	OS_NAME="$OSTYPE-$OSBITS"
+	echo "Unknown OS '$OS_NAME'"
+	exit 1
+fi
+export OS_NAME
+
+ARDUINO_BUILD_DIR="$HOME/.arduino/build.tmp"
+ARDUINO_CACHE_DIR="$HOME/.arduino/cache.tmp"
+
+if [ "$OS_IS_MACOS" == "1" ]; then
+	export ARDUINO_IDE_PATH="/Applications/Arduino.app/Contents/Java"
+	export ARDUINO_USR_PATH="$HOME/Documents/Arduino"
+elif [ "$OS_IS_WINDOWS" == "1" ]; then
+	export ARDUINO_IDE_PATH="$HOME/arduino_ide"
+	export ARDUINO_USR_PATH="$HOME/Documents/Arduino"
+else
+	export ARDUINO_IDE_PATH="$HOME/arduino_ide"
+	export ARDUINO_USR_PATH="$HOME/Arduino"
+fi
+
+# Updated as of Nov 3rd 2020
+ARDUINO_IDE_URL="https://github.com/espressif/arduino-esp32/releases/download/1.0.4/arduino-nightly-"
+
+# Currently not working
+#ARDUINO_IDE_URL="https://www.arduino.cc/download.php?f=/arduino-nightly-"
+
+if [ ! -d "$ARDUINO_IDE_PATH" ]; then
+	echo "Installing Arduino IDE on $OS_NAME ..."
+	echo "Downloading '$ARDUINO_IDE_URL$OS_NAME.$ARCHIVE_FORMAT' to 'arduino.$ARCHIVE_FORMAT' ..."
+	if [ "$OS_IS_LINUX" == "1" ]; then
+		wget -O "arduino.$ARCHIVE_FORMAT" "$ARDUINO_IDE_URL$OS_NAME.$ARCHIVE_FORMAT" > /dev/null 2>&1
+		echo "Extracting 'arduino.$ARCHIVE_FORMAT' ..."
+		tar xf "arduino.$ARCHIVE_FORMAT" > /dev/null
+		mv arduino-nightly "$ARDUINO_IDE_PATH"
+	else
+		curl -o "arduino.$ARCHIVE_FORMAT" -L "$ARDUINO_IDE_URL$OS_NAME.$ARCHIVE_FORMAT" > /dev/null 2>&1
+		echo "Extracting 'arduino.$ARCHIVE_FORMAT' ..."
+		unzip "arduino.$ARCHIVE_FORMAT" > /dev/null
+		if [ "$OS_IS_MACOS" == "1" ]; then
+			mv "Arduino.app" "/Applications/Arduino.app"
+		else
+			mv arduino-nightly "$ARDUINO_IDE_PATH"
+		fi
+	fi
+	rm -rf "arduino.$ARCHIVE_FORMAT"
+
+	mkdir -p "$ARDUINO_USR_PATH/libraries"
+	mkdir -p "$ARDUINO_USR_PATH/hardware"
+
+	echo "Arduino IDE Installed in '$ARDUINO_IDE_PATH'"
+	echo ""
+fi
+
+function build_sketch(){ # build_sketch <fqbn> <path-to-ino> [extra-options]
+    if [ "$#" -lt 2 ]; then
+		echo "ERROR: Illegal number of parameters"
+		echo "USAGE: build_sketch <fqbn> <path-to-ino> [extra-options]"
+		return 1
+	fi
+
+	local fqbn="$1"
+	local sketch="$2"
+	local xtra_opts="$3"
+	local win_opts=""
+	if [ "$OS_IS_WINDOWS" == "1" ]; then
+		local ctags_version=`ls "$ARDUINO_IDE_PATH/tools-builder/ctags/"`
+		local preprocessor_version=`ls "$ARDUINO_IDE_PATH/tools-builder/arduino-preprocessor/"`
+		win_opts="-prefs=runtime.tools.ctags.path=$ARDUINO_IDE_PATH/tools-builder/ctags/$ctags_version -prefs=runtime.tools.arduino-preprocessor.path=$ARDUINO_IDE_PATH/tools-builder/arduino-preprocessor/$preprocessor_version"
+	fi
+
+	echo ""
+	echo "Compiling '"$(basename "$sketch")"' ..."
+	mkdir -p "$ARDUINO_BUILD_DIR"
+	mkdir -p "$ARDUINO_CACHE_DIR"
+	$ARDUINO_IDE_PATH/arduino-builder -compile -logger=human -core-api-version=10810 \
+		-fqbn=$fqbn \
+		-warnings="all" \
+		-tools "$ARDUINO_IDE_PATH/tools-builder" \
+		-tools "$ARDUINO_IDE_PATH/tools" \
+		-built-in-libraries "$ARDUINO_IDE_PATH/libraries" \
+		-hardware "$ARDUINO_IDE_PATH/hardware" \
+		-hardware "$ARDUINO_USR_PATH/hardware" \
+		-libraries "$ARDUINO_USR_PATH/libraries" \
+		-build-cache "$ARDUINO_CACHE_DIR" \
+		-build-path "$ARDUINO_BUILD_DIR" \
+		$win_opts $xtra_opts "$sketch"
+}
+
+function count_sketches() # count_sketches <examples-path> <target-mcu>
+{
+	local examples="$1"
+	local target="$2"
+    rm -rf sketches.txt
+	if [ ! -d "$examples" ]; then
+		touch sketches.txt
+		return 0
+	fi
+    local sketches=$(find $examples -name *.ino)
+    local sketchnum=0
+    for sketch in $sketches; do
+        local sketchdir=$(dirname $sketch)
+        local sketchdirname=$(basename $sketchdir)
+        local sketchname=$(basename $sketch)
+        if [[ "${sketchdirname}.ino" != "$sketchname" ]]; then
+            continue
+        fi;
+        if [[ -f "$sketchdir/.skip.$target" ]]; then
+            continue
+        fi
+        echo $sketch >> sketches.txt
+        sketchnum=$(($sketchnum + 1))
+    done
+    return $sketchnum
+}
+
+function build_sketches() # build_sketches <fqbn> <target-mcu> <examples-path> <chunk> <total-chunks> [extra-options]
+{
+    local fqbn=$1
+	local target="$2"
+    local examples=$3
+    local chunk_idex=$4
+    local chunks_num=$5
+    local xtra_opts=$6
+
+    if [ "$#" -lt 3 ]; then
+		echo "ERROR: Illegal number of parameters"
+		echo "USAGE: build_sketches <fqbn> <target-mcu <examples-path> [<chunk> <total-chunks>] [extra-options]"
+		return 1
+	fi
+
+    if [ "$#" -lt 5 ]; then
+		chunk_idex="0"
+		chunks_num="1"
+		xtra_opts=$4
+	fi
+
+	if [ "$chunks_num" -le 0 ]; then
+		echo "ERROR: Chunks count must be positive number"
+		return 1
+	fi
+	if [ "$chunk_idex" -ge "$chunks_num" ]; then
+		echo "ERROR: Chunk index must be less than chunks count"
+		return 1
+	fi
+
+	set +e
+    count_sketches "$examples"
+    local sketchcount=$?
+	set -e
+    local sketches=$(cat sketches.txt)
+    rm -rf sketches.txt
+
+    local chunk_size=$(( $sketchcount / $chunks_num ))
+    local all_chunks=$(( $chunks_num * $chunk_size ))
+    if [ "$all_chunks" -lt "$sketchcount" ]; then
+    	chunk_size=$(( $chunk_size + 1 ))
+    fi
+
+    local start_index=$(( $chunk_idex * $chunk_size ))
+    if [ "$sketchcount" -le "$start_index" ]; then
+    	echo "Skipping job"
+    	return 0
+    fi
+
+    local end_index=$(( $(( $chunk_idex + 1 )) * $chunk_size ))
+    if [ "$end_index" -gt "$sketchcount" ]; then
+    	end_index=$sketchcount
+    fi
+
+    local start_num=$(( $start_index + 1 ))
+    echo "Found $sketchcount Sketches";
+    echo "Chunk Count : $chunks_num"
+    echo "Chunk Size  : $chunk_size"
+    echo "Start Sketch: $start_num"
+    echo "End Sketch  : $end_index"
+
+    local sketchnum=0
+    for sketch in $sketches; do
+        local sketchdir=$(dirname $sketch)
+        local sketchdirname=$(basename $sketchdir)
+        local sketchname=$(basename $sketch)
+        if [ "${sketchdirname}.ino" != "$sketchname" ] \
+        || [ -f "$sketchdir/.skip.$target" ]; then
+            continue
+        fi
+        sketchnum=$(($sketchnum + 1))
+        if [ "$sketchnum" -le "$start_index" ] \
+        || [ "$sketchnum" -gt "$end_index" ]; then
+        	continue
+        fi
+        build_sketch "$fqbn" "$sketch" "$xtra_opts"
+        local result=$?
+        if [ $result -ne 0 ]; then
+            return $result
+        fi
+    done
+    return 0
+}

.github/scripts/install-platformio-esp32.sh

@@ -0,0 +1,151 @@
+#!/bin/bash
+
+export PLATFORMIO_ESP32_PATH="$HOME/.platformio/packages/framework-arduinoespressif32"
+PLATFORMIO_ESP32_URL="https://github.com/platformio/platform-espressif32.git#feature/idf-v4.0"
+
+echo "Installing Python Wheel ..."
+pip install wheel > /dev/null 2>&1
+
+echo "Installing PlatformIO ..."
+pip install -U https://github.com/platformio/platformio/archive/develop.zip > /dev/null 2>&1
+
+echo "Installing Platform ESP32 ..."
+python -m platformio platform install $PLATFORMIO_ESP32_URL > /dev/null 2>&1
+
+echo "Replacing the framework version ..."
+python -c "import json; import os; fp=open(os.path.expanduser('~/.platformio/platforms/espressif32/platform.json'), 'r+'); data=json.load(fp); data['packages']['framework-arduinoespressif32']['version'] = '*'; del data['packages']['framework-arduinoespressif32']['owner']; fp.seek(0); fp.truncate(); json.dump(data, fp); fp.close()"
+
+if [ "$GITHUB_REPOSITORY" == "espressif/arduino-esp32" ];  then
+	echo "Linking Core..."
+	ln -s $GITHUB_WORKSPACE "$PLATFORMIO_ESP32_PATH"
+else
+	echo "Cloning Core Repository ..."
+	git clone --recursive https://github.com/espressif/arduino-esp32.git "$PLATFORMIO_ESP32_PATH" > /dev/null 2>&1
+fi
+
+echo "PlatformIO for ESP32 has been installed"
+echo ""
+
+function build_pio_sketch(){ # build_pio_sketch <board> <options> <path-to-ino>
+    if [ "$#" -lt 3 ]; then
+        echo "ERROR: Illegal number of parameters"
+        echo "USAGE: build_pio_sketch <board> <options> <path-to-ino>"
+        return 1
+    fi
+
+    local board="$1"
+    local options="$2"
+    local sketch="$3"
+    local sketch_dir=$(dirname "$sketch")
+    echo ""
+    echo "Compiling '"$(basename "$sketch")"' ..."
+    python -m platformio ci --board "$board" "$sketch_dir" --project-option="$options"
+}
+
+function count_sketches() # count_sketches <examples-path>
+{
+    local examples="$1"
+    rm -rf sketches.txt
+    if [ ! -d "$examples" ]; then
+        touch sketches.txt
+        return 0
+    fi
+    local sketches=$(find $examples -name *.ino)
+    local sketchnum=0
+    for sketch in $sketches; do
+        local sketchdir=$(dirname $sketch)
+        local sketchdirname=$(basename $sketchdir)
+        local sketchname=$(basename $sketch)
+        if [[ "${sketchdirname}.ino" != "$sketchname" ]]; then
+            continue
+        fi;
+        if [[ -f "$sketchdir/.test.skip" ]]; then
+            continue
+        fi
+        echo $sketch >> sketches.txt
+        sketchnum=$(($sketchnum + 1))
+    done
+    return $sketchnum
+}
+
+function build_pio_sketches() # build_pio_sketches <board> <options> <examples-path> <chunk> <total-chunks>
+{
+    if [ "$#" -lt 3 ]; then
+        echo "ERROR: Illegal number of parameters"
+        echo "USAGE: build_pio_sketches <board> <options> <examples-path> [<chunk> <total-chunks>]"
+        return 1
+    fi
+
+    local board=$1
+    local options="$2"
+    local examples=$3
+    local chunk_idex=$4
+    local chunks_num=$5
+
+    if [ "$#" -lt 5 ]; then
+        chunk_idex="0"
+        chunks_num="1"
+    fi
+
+    if [ "$chunks_num" -le 0 ]; then
+        echo "ERROR: Chunks count must be positive number"
+        return 1
+    fi
+    if [ "$chunk_idex" -ge "$chunks_num" ]; then
+        echo "ERROR: Chunk index must be less than chunks count"
+        return 1
+    fi
+
+    set +e
+    count_sketches "$examples"
+    local sketchcount=$?
+    set -e
+    local sketches=$(cat sketches.txt)
+    rm -rf sketches.txt
+
+    local chunk_size=$(( $sketchcount / $chunks_num ))
+    local all_chunks=$(( $chunks_num * $chunk_size ))
+    if [ "$all_chunks" -lt "$sketchcount" ]; then
+        chunk_size=$(( $chunk_size + 1 ))
+    fi
+
+    local start_index=$(( $chunk_idex * $chunk_size ))
+    if [ "$sketchcount" -le "$start_index" ]; then
+        echo "Skipping job"
+        return 0
+    fi
+
+    local end_index=$(( $(( $chunk_idex + 1 )) * $chunk_size ))
+    if [ "$end_index" -gt "$sketchcount" ]; then
+        end_index=$sketchcount
+    fi
+
+    local start_num=$(( $start_index + 1 ))
+    echo "Found $sketchcount Sketches";
+    echo "Chunk Count : $chunks_num"
+    echo "Chunk Size  : $chunk_size"
+    echo "Start Sketch: $start_num"
+    echo "End Sketch  : $end_index"
+
+    local sketchnum=0
+    for sketch in $sketches; do
+        local sketchdir=$(dirname $sketch)
+        local sketchdirname=$(basename $sketchdir)
+        local sketchname=$(basename $sketch)
+        if [ "${sketchdirname}.ino" != "$sketchname" ] \
+        || [ -f "$sketchdir/.test.skip" ]; then
+            continue
+        fi
+        sketchnum=$(($sketchnum + 1))
+        if [ "$sketchnum" -le "$start_index" ] \
+        || [ "$sketchnum" -gt "$end_index" ]; then
+            continue
+        fi
+        build_pio_sketch "$board" "$options" "$sketch"
+        local result=$?
+        if [ $result -ne 0 ]; then
+            return $result
+        fi
+    done
+    return 0
+}

.github/scripts/merge_packages.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+# This script merges two Arduino Board Manager package json files.
+# Usage:
+#   python merge_packages.py package_esp8266com_index.json version/new/package_esp8266com_index.json
+# Written by Ivan Grokhotkov, 2015
+#
+from __future__ import print_function
+from distutils.version import LooseVersion
+import re
+import json
+import sys
+
+def load_package(filename):
+    pkg = json.load(open(filename))['packages'][0]
+    print("Loaded package {0} from {1}".format(pkg['name'], filename), file=sys.stderr)
+    print("{0} platform(s), {1} tools".format(len(pkg['platforms']), len(pkg['tools'])), file=sys.stderr)
+    return pkg
+
+def merge_objects(versions, obj):
+    for o in obj:
+        name = o['name'].encode('ascii')
+        ver = o['version'].encode('ascii')
+        if not name in versions:
+            print("found new object, {0}".format(name), file=sys.stderr)
+            versions[name] = {}
+        if not ver in versions[name]:
+            print("found new version {0} for object {1}".format(ver, name), file=sys.stderr)
+            versions[name][ver] = o
+    return versions
+
+# Normalize ESP release version string (x.x.x) by adding '-rc<MAXINT>' (x.x.x-rc9223372036854775807) to ensure having REL above any RC
+# Dummy approach, functional anyway for current ESP package versioning (unlike NormalizedVersion/LooseVersion/StrictVersion & similar crap)
+def pkgVersionNormalized(versionString):
+
+    verStr = str(versionString)
+    verParts = re.split('\.|-rc', verStr, flags=re.IGNORECASE)
+    
+    if len(verParts) == 3:
+        if (sys.version_info > (3, 0)): # Python 3
+            verStr = str(versionString) + '-rc' + str(sys.maxsize)
+        else: # Python 2
+            verStr = str(versionString) + '-rc' + str(sys.maxint)
+        
+    elif len(verParts) != 4:
+        print("pkgVersionNormalized WARNING: unexpected version format: {0})".format(verStr), file=sys.stderr)
+        
+    return verStr
+
+
+def main(args):
+    if len(args) < 3:
+        print("Usage: {0} <package1> <package2>".format(args[0]), file=sys.stderr)
+        return 1
+
+    tools = {}
+    platforms = {} 
+    pkg1 = load_package(args[1])
+    tools = merge_objects(tools, pkg1['tools']);
+    platforms = merge_objects(platforms, pkg1['platforms']);
+    pkg2 = load_package(args[2])
+    tools = merge_objects(tools, pkg2['tools']);
+    platforms = merge_objects(platforms, pkg2['platforms']);
+
+    pkg1['tools'] = []
+    pkg1['platforms'] = []
+
+    for name in tools:
+        for version in tools[name]:
+            print("Adding tool {0}-{1}".format(name, version), file=sys.stderr)
+            pkg1['tools'].append(tools[name][version])
+
+    for name in platforms:
+        for version in platforms[name]:
+            print("Adding platform {0}-{1}".format(name, version), file=sys.stderr)
+            pkg1['platforms'].append(platforms[name][version])
+                
+    pkg1['platforms'] = sorted(pkg1['platforms'], key=lambda k: LooseVersion(pkgVersionNormalized(k['version'])), reverse=True)
+
+    json.dump({'packages':[pkg1]}, sys.stdout, indent=2)
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))

.github/scripts/on-pages.sh

@@ -0,0 +1,131 @@
+#/bin/bash
+set -e
+
+function get_file_size(){
+    local file="$1"
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+        eval `stat -s "$file"`
+        local res="$?"
+        echo "$st_size"
+        return $res
+    else
+        stat --printf="%s" "$file"
+        return $?
+    fi
+}
+
+#git_remove_from_pages <file>
+function git_remove_from_pages(){
+    local path=$1
+    local info=`curl -s -k -H "Authorization: token $GITHUB_TOKEN" -H "Accept: application/vnd.github.v3.object+json" -X GET "https://api.github.com/repos/$GITHUB_REPOSITORY/contents/$path?ref=gh-pages"`
+    local type=`echo "$info" | jq -r '.type'`
+    if [ ! $type == "file" ]; then
+        if [ ! $type == "null" ]; then
+            echo "Wrong type '$type'"
+        else
+            echo "File is not on Pages"
+        fi
+        return 0
+    fi
+    local sha=`echo "$info" | jq -r '.sha'`
+    local message="Deleting "$(basename $path)
+    local json="{\"branch\":\"gh-pages\",\"message\":\"$message\",\"sha\":\"$sha\"}"
+    echo "$json" | curl -s -k -H "Authorization: token $GITHUB_TOKEN" -H "Accept: application/vnd.github.v3.raw+json" -X DELETE --data @- "https://api.github.com/repos/$GITHUB_REPOSITORY/contents/$path"
+}
+
+function git_upload_to_pages(){
+    local path=$1
+    local src=$2
+
+    if [ ! -f "$src" ]; then
+        >&2 echo "Input is not a file! Aborting..."
+        return 1
+    fi
+
+    local info=`curl -s -k -H "Authorization: token $GITHUB_TOKEN" -H "Accept: application/vnd.github.v3.object+json" -X GET "https://api.github.com/repos/$GITHUB_REPOSITORY/contents/$path?ref=gh-pages"`
+    local type=`echo "$info" | jq -r '.type'`
+    local message=$(basename $path)
+    local sha=""
+    local content=""
+
+    if [ $type == "file" ]; then
+        sha=`echo "$info" | jq -r '.sha'`
+        sha=",\"sha\":\"$sha\""
+        message="Updating $message"
+    elif [ ! $type == "null" ]; then
+        >&2 echo "Wrong type '$type'"
+        return 1
+    else
+        message="Creating $message"
+    fi
+
+    content=`base64 -i "$src"`
+    data="{\"branch\":\"gh-pages\",\"message\":\"$message\",\"content\":\"$content\"$sha}"
+
+    echo "$data" | curl -s -k -H "Authorization: token $GITHUB_TOKEN" -H "Accept: application/vnd.github.v3.raw+json" -X PUT --data @- "https://api.github.com/repos/$GITHUB_REPOSITORY/contents/$path"
+}
+
+function git_safe_upload_to_pages(){
+    local path=$1
+    local file="$2"
+    local name=$(basename "$file")
+    local size=`get_file_size "$file"`
+    local upload_res=`git_upload_to_pages "$path" "$file"`
+    if [ $? -ne 0 ]; then 
+        >&2 echo "ERROR: Failed to upload '$name' ($?)"
+        return 1
+    fi
+    up_size=`echo "$upload_res" | jq -r '.content.size'`
+    if [ $up_size -ne $size ]; then
+        >&2 echo "ERROR: Uploaded size does not match! $up_size != $size"
+        #git_delete_asset
+        return 1
+    fi
+    echo "$upload_res" | jq -r '.content.download_url'
+    return $?
+}
+
+EVENT_JSON=`cat $GITHUB_EVENT_PATH`
+
+pages_added=`echo "$EVENT_JSON" | jq -r '.commits[].added[]'`
+pages_modified=`echo "$EVENT_JSON" | jq -r '.commits[].modified[]'`
+pages_removed=`echo "$EVENT_JSON" | jq -r '.commits[].removed[]'`
+
+for page in $pages_added; do
+    if [[ $page != "README.md" && $page != "docs/"* ]]; then
+        continue
+    fi
+    echo "Adding '$page' to pages ..."
+    if [[ $page == "README.md" ]]; then
+        git_safe_upload_to_pages "index.md" "README.md"
+    else
+        git_safe_upload_to_pages "$page" "$page"
+    fi
+done
+
+for page in $pages_modified; do
+    if [[ $page != "README.md" && $page != "docs/"* ]]; then
+        continue
+    fi
+    echo "Modifying '$page' ..."
+    if [[ $page == "README.md" ]]; then
+        git_safe_upload_to_pages "index.md" "README.md"
+    else
+        git_safe_upload_to_pages "$page" "$page"
+    fi
+done
+
+for page in $pages_removed; do
+    if [[ $page != "README.md" && $page != "docs/"* ]]; then
+        continue
+    fi
+    echo "Removing '$page' from pages ..."
+    if [[ $page == "README.md" ]]; then
+        git_remove_from_pages "README.md" > /dev/null
+    else
+        git_remove_from_pages "$page" > /dev/null
+    fi
+done
+
+echo
+echo "DONE!"

.github/scripts/on-push.sh

@@ -0,0 +1,91 @@
+#!/bin/bash
+
+set -e
+
+if [ ! -z "$TRAVIS_TAG" ]; then
+	echo "Skipping Test: Tagged build"
+	exit 0
+fi
+
+if [ ! -z "$GITHUB_WORKSPACE" ]; then
+	export TRAVIS_BUILD_DIR="$GITHUB_WORKSPACE"
+	export TRAVIS_REPO_SLUG="$GITHUB_REPOSITORY"
+elif [ ! -z "$TRAVIS_BUILD_DIR" ]; then
+	export GITHUB_WORKSPACE="$TRAVIS_BUILD_DIR"
+	export GITHUB_REPOSITORY="$TRAVIS_REPO_SLUG"
+else
+	export GITHUB_WORKSPACE="$PWD"
+	export GITHUB_REPOSITORY="espressif/arduino-esp32"
+fi
+
+CHUNK_INDEX=$1
+CHUNKS_CNT=$2
+BUILD_PIO=0
+if [ "$#" -lt 2 ] || [ "$CHUNKS_CNT" -le 0 ]; then
+	CHUNK_INDEX=0
+	CHUNKS_CNT=1
+elif [ "$CHUNK_INDEX" -gt "$CHUNKS_CNT" ]; then
+	CHUNK_INDEX=$CHUNKS_CNT
+elif [ "$CHUNK_INDEX" -eq "$CHUNKS_CNT" ]; then
+	BUILD_PIO=1
+fi
+
+#echo "Updating submodules ..."
+#git -C "$GITHUB_WORKSPACE" submodule update --init --recursive > /dev/null 2>&1
+
+if [ "$BUILD_PIO" -eq 0 ]; then
+	# ArduinoIDE ESP32 Test
+    TARGET="esp32"
+	FQBN="espressif:esp32:esp32:PSRAM=enabled,PartitionScheme=huge_app"
+	source ./.github/scripts/install-arduino-ide.sh
+	source ./.github/scripts/install-arduino-core-esp32.sh
+	if [ "$OS_IS_WINDOWS" == "1" ]; then
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/WiFiClientSecure/examples/WiFiClientSecure/WiFiClientSecure.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/BLE/examples/BLE_server/BLE_server.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/ESP32/examples/Camera/CameraWebServer/CameraWebServer.ino"
+	elif [ "$OS_IS_MACOS" == "1" ]; then
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/WiFi/examples/WiFiClient/WiFiClient.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/WiFiClientSecure/examples/WiFiClientSecure/WiFiClientSecure.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/BLE/examples/BLE_server/BLE_server.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/ESP32/examples/Camera/CameraWebServer/CameraWebServer.ino"
+	else
+		# CMake Test
+		if [ "$CHUNK_INDEX" -eq 0 ]; then
+			bash "$ARDUINO_ESP32_PATH/.github/scripts/check-cmakelists.sh"
+		fi
+		build_sketches "$FQBN" "$TARGET" "$ARDUINO_ESP32_PATH/libraries" "$CHUNK_INDEX" "$CHUNKS_CNT"
+	fi
+
+	# ArduinoIDE ESP32S2 Test
+    TARGET="esp32s2"
+	FQBN="espressif:esp32:esp32s2:PSRAM=enabled,PartitionScheme=huge_app"
+	if [ "$OS_IS_WINDOWS" == "1" ]; then
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/WiFi/examples/WiFiClient/WiFiClient.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/WiFiClientSecure/examples/WiFiClientSecure/WiFiClientSecure.ino"
+	elif [ "$OS_IS_MACOS" == "1" ]; then
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/WiFi/examples/WiFiClient/WiFiClient.ino" && \
+		build_sketch "$FQBN" "$ARDUINO_ESP32_PATH/libraries/WiFiClientSecure/examples/WiFiClientSecure/WiFiClientSecure.ino"
+	else
+		build_sketches "$FQBN" "$TARGET" "$ARDUINO_ESP32_PATH/libraries" "$CHUNK_INDEX" "$CHUNKS_CNT"
+    fi
+else
+	source ./.github/scripts/install-platformio-esp32.sh
+	# PlatformIO ESP32 Test
+	BOARD="esp32dev"
+    OPTIONS="board_build.partitions = huge_app.csv"
+	build_pio_sketch "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries/WiFi/examples/WiFiClient/WiFiClient.ino" && \
+	build_pio_sketch "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries/WiFiClientSecure/examples/WiFiClientSecure/WiFiClientSecure.ino" && \
+	build_pio_sketch "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino" && \
+	build_pio_sketch "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries/BLE/examples/BLE_server/BLE_server.ino" && \
+	build_pio_sketch "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries/ESP32/examples/Camera/CameraWebServer/CameraWebServer.ino"
+	
+	# PlatformIO ESP32 Test
+    # OPTIONS="board_build.mcu = esp32s2"
+    # build_pio_sketch "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries/WiFi/examples/WiFiClient/WiFiClient.ino" && \
+    # build_pio_sketch "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries/WiFiClientSecure/examples/WiFiClientSecure/WiFiClientSecure.ino"
+
+    python -m platformio ci --board "$BOARD" "$PLATFORMIO_ESP32_PATH/libraries/WiFi/examples/WiFiClient" --project-option="board_build.mcu = esp32s2" --project-option="board_build.partitions = huge_app.csv"
+    
+	#build_pio_sketches "$BOARD" "$OPTIONS" "$PLATFORMIO_ESP32_PATH/libraries"
+fi

.github/scripts/on-release.sh

@@ -0,0 +1,380 @@
+#!/bin/bash
+
+if [ ! $GITHUB_EVENT_NAME == "release" ]; then
+    echo "Wrong event '$GITHUB_EVENT_NAME'!"
+    exit 1
+fi
+
+EVENT_JSON=`cat $GITHUB_EVENT_PATH`
+
+action=`echo $EVENT_JSON | jq -r '.action'`
+if [ ! $action == "published" ]; then
+    echo "Wrong action '$action'. Exiting now..."
+    exit 0
+fi
+
+draft=`echo $EVENT_JSON | jq -r '.release.draft'`
+if [ $draft == "true" ]; then
+    echo "It's a draft release. Exiting now..."
+    exit 0
+fi
+
+RELEASE_PRE=`echo $EVENT_JSON | jq -r '.release.prerelease'`
+RELEASE_TAG=`echo $EVENT_JSON | jq -r '.release.tag_name'`
+RELEASE_BRANCH=`echo $EVENT_JSON | jq -r '.release.target_commitish'`
+RELEASE_ID=`echo $EVENT_JSON | jq -r '.release.id'`
+RELEASE_BODY=`echo $EVENT_JSON | jq -r '.release.body'`
+
+OUTPUT_DIR="$GITHUB_WORKSPACE/build"
+PACKAGE_NAME="esp32-$RELEASE_TAG"
+PACKAGE_JSON_MERGE="$GITHUB_WORKSPACE/.github/scripts/merge_packages.py"
+PACKAGE_JSON_TEMPLATE="$GITHUB_WORKSPACE/package/package_esp32_index.template.json"
+PACKAGE_JSON_DEV="package_esp32_dev_index.json"
+PACKAGE_JSON_REL="package_esp32_index.json"
+
+echo "Event: $GITHUB_EVENT_NAME, Repo: $GITHUB_REPOSITORY, Path: $GITHUB_WORKSPACE, Ref: $GITHUB_REF"
+echo "Action: $action, Branch: $RELEASE_BRANCH, ID: $RELEASE_ID" 
+echo "Tag: $RELEASE_TAG, Draft: $draft, Pre-Release: $RELEASE_PRE"
+
+function get_file_size(){
+    local file="$1"
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+        eval `stat -s "$file"`
+        local res="$?"
+        echo "$st_size"
+        return $res
+    else
+        stat --printf="%s" "$file"
+        return $?
+    fi
+}
+
+function git_upload_asset(){
+    local name=$(basename "$1")
+    # local mime=$(file -b --mime-type "$1")
+    curl -k -X POST -sH "Authorization: token $GITHUB_TOKEN" -H "Content-Type: application/octet-stream" --data-binary @"$1" "https://uploads.github.com/repos/$GITHUB_REPOSITORY/releases/$RELEASE_ID/assets?name=$name"
+}
+
+function git_safe_upload_asset(){
+    local file="$1"
+    local name=$(basename "$file")
+    local size=`get_file_size "$file"`
+    local upload_res=`git_upload_asset "$file"`
+    if [ $? -ne 0 ]; then 
+        >&2 echo "ERROR: Failed to upload '$name' ($?)"
+        return 1
+    fi
+    up_size=`echo "$upload_res" | jq -r '.size'`
+    if [ $up_size -ne $size ]; then
+        >&2 echo "ERROR: Uploaded size does not match! $up_size != $size"
+        #git_delete_asset
+        return 1
+    fi
+    echo "$upload_res" | jq -r '.browser_download_url'
+    return $?
+}
+
+function git_upload_to_pages(){
+    local path=$1
+    local src=$2
+
+    if [ ! -f "$src" ]; then
+        >&2 echo "Input is not a file! Aborting..."
+        return 1
+    fi
+
+    local info=`curl -s -k -H "Authorization: token $GITHUB_TOKEN" -H "Accept: application/vnd.github.v3.object+json" -X GET "https://api.github.com/repos/$GITHUB_REPOSITORY/contents/$path?ref=gh-pages"`
+    local type=`echo "$info" | jq -r '.type'`
+    local message=$(basename $path)
+    local sha=""
+    local content=""
+
+    if [ $type == "file" ]; then
+        sha=`echo "$info" | jq -r '.sha'`
+        sha=",\"sha\":\"$sha\""
+        message="Updating $message"
+    elif [ ! $type == "null" ]; then
+        >&2 echo "Wrong type '$type'"
+        return 1
+    else
+        message="Creating $message"
+    fi
+
+    content=`base64 -i "$src"`
+    data="{\"branch\":\"gh-pages\",\"message\":\"$message\",\"content\":\"$content\"$sha}"
+
+    echo "$data" | curl -s -k -H "Authorization: token $GITHUB_TOKEN" -H "Accept: application/vnd.github.v3.raw+json" -X PUT --data @- "https://api.github.com/repos/$GITHUB_REPOSITORY/contents/$path"
+}
+
+function git_safe_upload_to_pages(){
+    local path=$1
+    local file="$2"
+    local name=$(basename "$file")
+    local size=`get_file_size "$file"`
+    local upload_res=`git_upload_to_pages "$path" "$file"`
+    if [ $? -ne 0 ]; then 
+        >&2 echo "ERROR: Failed to upload '$name' ($?)"
+        return 1
+    fi
+    up_size=`echo "$upload_res" | jq -r '.content.size'`
+    if [ $up_size -ne $size ]; then
+        >&2 echo "ERROR: Uploaded size does not match! $up_size != $size"
+        #git_delete_asset
+        return 1
+    fi
+    echo "$upload_res" | jq -r '.content.download_url'
+    return $?
+}
+
+function merge_package_json(){
+    local jsonLink=$1
+    local jsonOut=$2
+    local old_json=$OUTPUT_DIR/oldJson.json
+    local merged_json=$OUTPUT_DIR/mergedJson.json
+    
+    echo "Downloading previous JSON $jsonLink ..."
+    curl -L -o "$old_json" "https://github.com/$GITHUB_REPOSITORY/releases/download/$jsonLink?access_token=$GITHUB_TOKEN" 2>/dev/null
+    if [ $? -ne 0 ]; then echo "ERROR: Download Failed! $?"; exit 1; fi
+
+    echo "Creating new JSON ..."
+    set +e
+    stdbuf -oL python "$PACKAGE_JSON_MERGE" "$jsonOut" "$old_json" > "$merged_json"
+    set -e
+    
+    set -v
+    if [ ! -s $merged_json ]; then
+        rm -f "$merged_json"
+        echo "Nothing to merge"
+    else
+        rm -f "$jsonOut"
+        mv "$merged_json" "$jsonOut"
+        echo "JSON data successfully merged"
+    fi
+    rm -f "$old_json"
+    set +v
+}
+
+set -e
+
+##
+## PACKAGE ZIP
+##
+
+mkdir -p "$OUTPUT_DIR"
+PKG_DIR="$OUTPUT_DIR/$PACKAGE_NAME"
+PACKAGE_ZIP="$PACKAGE_NAME.zip"
+
+echo "Updating submodules ..."
+git -C "$GITHUB_WORKSPACE" submodule update --init --recursive > /dev/null 2>&1
+
+mkdir -p "$PKG_DIR/tools"
+
+# Copy all core files to the package folder
+echo "Copying files for packaging ..."
+cp -f  "$GITHUB_WORKSPACE/boards.txt"              "$PKG_DIR/"
+cp -f  "$GITHUB_WORKSPACE/programmers.txt"         "$PKG_DIR/"
+cp -Rf "$GITHUB_WORKSPACE/cores"                   "$PKG_DIR/"
+cp -Rf "$GITHUB_WORKSPACE/libraries"               "$PKG_DIR/"
+cp -Rf "$GITHUB_WORKSPACE/variants"                "$PKG_DIR/"
+cp -f  "$GITHUB_WORKSPACE/tools/espota.exe"        "$PKG_DIR/tools/"
+cp -f  "$GITHUB_WORKSPACE/tools/espota.py"         "$PKG_DIR/tools/"
+cp -f  "$GITHUB_WORKSPACE/tools/esptool.py"        "$PKG_DIR/tools/"
+cp -f  "$GITHUB_WORKSPACE/tools/gen_esp32part.py"  "$PKG_DIR/tools/"
+cp -f  "$GITHUB_WORKSPACE/tools/gen_esp32part.exe" "$PKG_DIR/tools/"
+cp -Rf "$GITHUB_WORKSPACE/tools/partitions"        "$PKG_DIR/tools/"
+cp -Rf "$GITHUB_WORKSPACE/tools/sdk"               "$PKG_DIR/tools/"
+
+# Remove unnecessary files in the package folder
+echo "Cleaning up folders ..."
+find "$PKG_DIR" -name '*.DS_Store' -exec rm -f {} \;
+find "$PKG_DIR" -name '*.git*' -type f -delete
+
+# Replace tools locations in platform.txt
+echo "Generating platform.txt..."
+cat "$GITHUB_WORKSPACE/platform.txt" | \
+sed "s/version=.*/version=$ver$extent/g" | \
+sed 's/runtime.tools.xtensa-esp32-elf-gcc.path={runtime.platform.path}\/tools\/xtensa-esp32-elf//g' | \
+sed 's/tools.esptool_py.path={runtime.platform.path}\/tools\/esptool/tools.esptool_py.path=\{runtime.tools.esptool_py.path\}/g' \
+ > "$PKG_DIR/platform.txt"
+
+# Add header with version information
+echo "Generating core_version.h ..."
+ver_define=`echo $RELEASE_TAG | tr "[:lower:].\055" "[:upper:]_"`
+ver_hex=`git -C "$GITHUB_WORKSPACE" rev-parse --short=8 HEAD 2>/dev/null`
+echo \#define ARDUINO_ESP32_GIT_VER 0x$ver_hex > "$PKG_DIR/cores/esp32/core_version.h"
+echo \#define ARDUINO_ESP32_GIT_DESC `git -C "$GITHUB_WORKSPACE" describe --tags 2>/dev/null` >> "$PKG_DIR/cores/esp32/core_version.h"
+echo \#define ARDUINO_ESP32_RELEASE_$ver_define >> "$PKG_DIR/cores/esp32/core_version.h"
+echo \#define ARDUINO_ESP32_RELEASE \"$ver_define\" >> "$PKG_DIR/cores/esp32/core_version.h"
+
+# Compress package folder
+echo "Creating ZIP ..."
+pushd "$OUTPUT_DIR" >/dev/null
+zip -qr "$PACKAGE_ZIP" "$PACKAGE_NAME"
+if [ $? -ne 0 ]; then echo "ERROR: Failed to create $PACKAGE_ZIP ($?)"; exit 1; fi
+
+# Calculate SHA-256
+echo "Calculating SHA sum ..."
+PACKAGE_PATH="$OUTPUT_DIR/$PACKAGE_ZIP"
+PACKAGE_SHA=`shasum -a 256 "$PACKAGE_ZIP" | cut -f 1 -d ' '`
+PACKAGE_SIZE=`get_file_size "$PACKAGE_ZIP"`
+popd >/dev/null
+rm -rf "$PKG_DIR"
+echo "'$PACKAGE_ZIP' Created! Size: $PACKAGE_SIZE, SHA-256: $PACKAGE_SHA"
+echo
+
+# Upload package to release page
+echo "Uploading package to release page ..."
+PACKAGE_URL=`git_safe_upload_asset "$PACKAGE_PATH"`
+echo "Package Uploaded"
+echo "Download URL: $PACKAGE_URL"
+echo
+
+##
+## PACKAGE JSON
+##
+
+# Construct JQ argument with package data
+jq_arg=".packages[0].platforms[0].version = \"$RELEASE_TAG\" | \
+    .packages[0].platforms[0].url = \"$PACKAGE_URL\" |\
+    .packages[0].platforms[0].archiveFileName = \"$PACKAGE_ZIP\" |\
+    .packages[0].platforms[0].size = \"$PACKAGE_SIZE\" |\
+    .packages[0].platforms[0].checksum = \"SHA-256:$PACKAGE_SHA\""
+
+# Generate package JSONs
+echo "Genarating $PACKAGE_JSON_DEV ..."
+cat "$PACKAGE_JSON_TEMPLATE" | jq "$jq_arg" > "$OUTPUT_DIR/$PACKAGE_JSON_DEV"
+if [ "$RELEASE_PRE" == "false" ]; then
+    echo "Genarating $PACKAGE_JSON_REL ..."
+    cat "$PACKAGE_JSON_TEMPLATE" | jq "$jq_arg" > "$OUTPUT_DIR/$PACKAGE_JSON_REL"
+fi
+
+# Figure out the last release or pre-release
+echo "Getting previous releases ..."
+releasesJson=`curl -sH "Authorization: token $GITHUB_TOKEN" "https://api.github.com/repos/$GITHUB_REPOSITORY/releases" 2>/dev/null`
+if [ $? -ne 0 ]; then echo "ERROR: Get Releases Failed! ($?)"; exit 1; fi
+
+set +e
+prev_release=$(echo "$releasesJson" | jq -e -r '. | map(select(.draft == false and .prerelease == false)) | sort_by(.created_at | - fromdateiso8601) | .[0].tag_name')
+prev_any_release=$(echo "$releasesJson" | jq -e -r '. | map(select(.draft == false)) | sort_by(.created_at | - fromdateiso8601)  | .[0].tag_name')
+shopt -s nocasematch
+if [ "$prev_any_release" == "$RELEASE_TAG" ]; then
+    prev_release=$(echo "$releasesJson" | jq -e -r '. | map(select(.draft == false and .prerelease == false)) | sort_by(.created_at | - fromdateiso8601) | .[1].tag_name')
+    prev_any_release=$(echo "$releasesJson" | jq -e -r '. | map(select(.draft == false)) | sort_by(.created_at | - fromdateiso8601)  | .[1].tag_name')
+fi
+COMMITS_SINCE_RELEASE="$prev_any_release"
+shopt -u nocasematch
+set -e
+
+# Merge package JSONs with previous releases
+if [ ! -z "$prev_any_release" ] && [ "$prev_any_release" != "null" ]; then
+    echo "Merging with JSON from $prev_any_release ..."
+    merge_package_json "$prev_any_release/$PACKAGE_JSON_DEV" "$OUTPUT_DIR/$PACKAGE_JSON_DEV"
+fi
+
+if [ "$RELEASE_PRE" == "false" ]; then
+    COMMITS_SINCE_RELEASE="$prev_release"
+    if [ ! -z "$prev_release" ] && [ "$prev_release" != "null" ]; then
+        echo "Merging with JSON from $prev_release ..."
+        merge_package_json "$prev_release/$PACKAGE_JSON_REL" "$OUTPUT_DIR/$PACKAGE_JSON_REL"
+    fi
+fi
+
+echo "Previous Release: $prev_release"
+echo "Previous (any)release: $prev_any_release"
+echo
+
+# Upload package JSONs
+echo "Uploading $PACKAGE_JSON_DEV ..."
+echo "Download URL: "`git_safe_upload_asset "$OUTPUT_DIR/$PACKAGE_JSON_DEV"`
+echo "Pages URL: "`git_safe_upload_to_pages "$PACKAGE_JSON_DEV" "$OUTPUT_DIR/$PACKAGE_JSON_DEV"`
+echo
+if [ "$RELEASE_PRE" == "false" ]; then
+    echo "Uploading $PACKAGE_JSON_REL ..."
+    echo "Download URL: "`git_safe_upload_asset "$OUTPUT_DIR/$PACKAGE_JSON_REL"`
+    echo "Pages URL: "`git_safe_upload_to_pages "$PACKAGE_JSON_REL" "$OUTPUT_DIR/$PACKAGE_JSON_REL"`
+    echo
+fi
+
+##
+## RELEASE NOTES
+##
+
+# Create release notes
+echo "Preparing release notes ..."
+releaseNotes=""
+
+# Process annotated tags
+relNotesRaw=`git -C "$GITHUB_WORKSPACE" show -s --format=%b $RELEASE_TAG`
+readarray -t msgArray <<<"$relNotesRaw"
+arrLen=${#msgArray[@]}
+if [ $arrLen > 3 ] && [ "${msgArray[0]:0:3}" == "tag" ]; then 
+    ind=3
+    while [ $ind -lt $arrLen ]; do
+        if [ $ind -eq 3 ]; then
+            releaseNotes="#### ${msgArray[ind]}"
+            releaseNotes+=$'\r\n'
+        else
+            oneLine="$(echo -e "${msgArray[ind]}" | sed -e 's/^[[:space:]]*//')"
+            if [ ${#oneLine} -gt 0 ]; then
+                if [ "${oneLine:0:2}" == "* " ]; then oneLine=$(echo ${oneLine/\*/-}); fi
+                if [ "${oneLine:0:2}" != "- " ]; then releaseNotes+="- "; fi        
+                releaseNotes+="$oneLine"
+                releaseNotes+=$'\r\n'
+            fi
+        fi
+        let ind=$ind+1
+    done
+fi
+
+# Append Commit Messages
+if [ ! -z "$COMMITS_SINCE_RELEASE" ] && [ "$COMMITS_SINCE_RELEASE" != "null" ]; then
+    echo "Getting commits since $COMMITS_SINCE_RELEASE ..."
+    commitFile=$OUTPUT_DIR/commits.txt
+    git -C "$GITHUB_WORKSPACE" log --oneline $COMMITS_SINCE_RELEASE.. > "$OUTPUT_DIR/commits.txt"
+    releaseNotes+=$'\r\n##### Commits\r\n'
+    IFS=$'\n'
+    for next in `cat $commitFile`
+    do
+        IFS=' ' read -r commitId commitMsg <<< "$next"
+        commitLine="- [$commitId](https://github.com/$GITHUB_REPOSITORY/commit/$commitId) $commitMsg"
+        releaseNotes+="$commitLine"
+        releaseNotes+=$'\r\n'
+    done
+    rm -f $commitFile
+fi
+
+# Prepend the original release body
+if [ "${RELEASE_BODY: -1}" == $'\r' ]; then         
+    RELEASE_BODY="${RELEASE_BODY:0:-1}"
+else 
+    RELEASE_BODY="$RELEASE_BODY"
+fi
+RELEASE_BODY+=$'\r\n'
+releaseNotes="$RELEASE_BODY$releaseNotes"
+
+# Update release page
+echo "Updating release notes ..."
+releaseNotes=$(printf '%s' "$releaseNotes" | python -c 'import json,sys; print(json.dumps(sys.stdin.read()))')
+releaseNotes=${releaseNotes:1:-1}
+curlData="{\"body\": \"$releaseNotes\"}"
+releaseData=`curl --data "$curlData" "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/$RELEASE_ID?access_token=$GITHUB_TOKEN" 2>/dev/null`
+if [ $? -ne 0 ]; then echo "ERROR: Updating Release Failed: $?"; exit 1; fi
+echo "Release notes successfully updated"
+echo
+
+##
+## SUBMODULE VERSIONS
+##
+
+# Upload submodules versions
+echo "Generating submodules.txt ..."
+git -C "$GITHUB_WORKSPACE" submodule status > "$OUTPUT_DIR/submodules.txt"
+echo "Uploading submodules.txt ..."
+echo "Download URL: "`git_safe_upload_asset "$OUTPUT_DIR/submodules.txt"`
+echo ""
+set +e
+
+##
+## DONE
+##
+echo "DONE!"

.github/stale.yml

@@ -0,0 +1,64 @@
+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Number of days of inactivity before an Issue or Pull Request becomes stale
+daysUntilStale: 60
+
+# Number of days of inactivity before an Issue or Pull Request with the stale label is closed.
+# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
+daysUntilClose: 14
+
+# Only issues or pull requests with all of these labels are check if stale. Defaults to `[]` (disabled)
+onlyLabels: []
+
+# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
+exemptLabels:
+  - pinned
+  - security
+  - "to be implemented"
+  - "for reference"
+  - "move to PR"
+  - "enhancement"
+
+# Set to true to ignore issues in a project (defaults to false)
+exemptProjects: false
+
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: false
+
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: false
+
+# Label to use when marking as stale
+staleLabel: stale
+
+# Comment to post when marking as stale. Set to `false` to disable
+markComment: >
+  [STALE_SET] This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed in 14 days if no further activity occurs. Thank you
+  for your contributions.
+
+# Comment to post when removing the stale label.
+unmarkComment: >
+  [STALE_CLR] This issue has been removed from the stale queue. Please ensure activity to keep it openin the future.
+
+# Comment to post when closing a stale Issue or Pull Request.
+closeComment: >
+  [STALE_DEL] This stale issue has been automatically closed. Thank you for your contributions.
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 30
+
+# Limit to only `issues` or `pulls`
+only: issues
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+# pulls:
+#   daysUntilStale: 30
+#   markComment: >
+#     This pull request has been automatically marked as stale because it has not had
+#     recent activity. It will be closed if no further activity occurs. Thank you
+#     for your contributions.
+
+# issues:
+#   exemptLabels:
+#     - confirmed

.github/workflows/gh-pages.yml

@@ -0,0 +1,21 @@
+name: GitHub Pages CI
+
+on:
+  push:
+    branches:
+    - master
+    paths:
+    - 'README.md'
+    - 'docs/**'
+
+jobs:
+
+  build-pages:
+    name: Build GitHub Pages
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Copy Files
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: bash ./.github/scripts/on-pages.sh

.github/workflows/push.yml

@@ -0,0 +1,58 @@
+name: ESP32 Arduino CI
+
+on:
+  push:
+    branches:
+    - master
+    - release/*
+  pull_request:
+
+jobs:
+  
+  # Ubuntu
+  build-arduino-linux:
+    name: Arduino ${{ matrix.chunk }} on ubuntu-latest
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        chunk: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
+    
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - name: Build Sketches
+      run: bash ./.github/scripts/on-push.sh ${{ matrix.chunk }} 15
+
+  # Windows and MacOS
+  build-arduino-win-mac:
+    name: Arduino on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, macOS-latest]
+    
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - name: Build Sketches
+      run: bash ./.github/scripts/on-push.sh
+
+  # PlatformIO on Windows, Ubuntu and Mac
+  build-platformio:
+    name: PlatformIO on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+    
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - name: Build Sketches
+      run: bash ./.github/scripts/on-push.sh 1 1 #equal and non-zero to trigger PIO

.github/workflows/release.yml

@@ -0,0 +1,20 @@
+name: ESP32 Arduino Release
+
+on:
+  release:
+    types: published
+
+jobs:
+  build:
+    name: Publish Release
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - name: Build Release
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: bash ./.github/scripts/on-release.sh

.gitignore

@@ -1,4 +1,5 @@
 tools/xtensa-esp32-elf
+tools/xtensa-esp32s2-elf
 tools/dist
 tools/esptool
 tools/esptool.exe
@@ -12,3 +13,6 @@ tools/mkspiffs/mkspiffs.exe
 .vs/
 __vm/
 *.vcxproj*
+.vscode/
+platform.sloeber.txt
+boards.sloeber.txt

.travis.yml

@@ -0,0 +1,55 @@
+sudo: false
+
+language: python
+
+os:
+  - linux
+
+git:
+  depth: false
+
+before_install:
+  - git submodule update --init --recursive
+
+stages:
+  - build
+  - deploy
+
+jobs:
+  include:
+
+    - name: "Build Arduino 0"
+      if: tag IS blank AND (type = pull_request OR (type = push AND branch = master))
+      stage: build
+      script: $TRAVIS_BUILD_DIR/.github/scripts/on-push.sh 0 10
+
+    - name: "Build Arduino 1"
+      if: tag IS blank AND (type = pull_request OR (type = push AND branch = master))
+      stage: build
+      script: $TRAVIS_BUILD_DIR/.github/scripts/on-push.sh 1 10
+
+    - name: "Build Arduino 2"
+      if: tag IS blank AND (type = pull_request OR (type = push AND branch = master))
+      stage: build
+      script: $TRAVIS_BUILD_DIR/.github/scripts/on-push.sh 2 10
+
+    - name: "Build Arduino 3"
+      if: tag IS blank AND (type = pull_request OR (type = push AND branch = master))
+      stage: build
+      script: $TRAVIS_BUILD_DIR/.github/scripts/on-push.sh 3 10
+
+    - name: "Build PlatformIO"
+      if: tag IS blank AND (type = pull_request OR (type = push AND branch = master))
+      stage: build
+      script: $TRAVIS_BUILD_DIR/.github/scripts/on-push.sh 1 1
+
+notifications:
+  email:
+    on_success: change
+    on_failure: change
+  webhooks:
+    urls:
+        - https://webhooks.gitter.im/e/cb057279c430d91a47a8
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: never     # options: [always|never|change] default: always

CMakeLists.txt

@@ -0,0 +1,162 @@
+set(CORE_SRCS
+  cores/esp32/base64.cpp
+  cores/esp32/cbuf.cpp
+  cores/esp32/esp32-hal-adc.c
+  cores/esp32/esp32-hal-bt.c
+  cores/esp32/esp32-hal-cpu.c
+  cores/esp32/esp32-hal-dac.c
+  cores/esp32/esp32-hal-gpio.c
+  cores/esp32/esp32-hal-i2c.c
+  cores/esp32/esp32-hal-ledc.c
+  cores/esp32/esp32-hal-matrix.c
+  cores/esp32/esp32-hal-misc.c
+  cores/esp32/esp32-hal-psram.c
+  cores/esp32/esp32-hal-sigmadelta.c
+  cores/esp32/esp32-hal-spi.c
+  cores/esp32/esp32-hal-time.c
+  cores/esp32/esp32-hal-timer.c
+  cores/esp32/esp32-hal-tinyusb.c
+  cores/esp32/esp32-hal-touch.c
+  cores/esp32/esp32-hal-uart.c
+  cores/esp32/esp32-hal-rmt.c
+  cores/esp32/Esp.cpp
+  cores/esp32/FunctionalInterrupt.cpp
+  cores/esp32/HardwareSerial.cpp
+  cores/esp32/IPAddress.cpp
+  cores/esp32/IPv6Address.cpp
+  cores/esp32/libb64/cdecode.c
+  cores/esp32/libb64/cencode.c
+  cores/esp32/main.cpp
+  cores/esp32/MD5Builder.cpp
+  cores/esp32/Print.cpp
+  cores/esp32/stdlib_noniso.c
+  cores/esp32/Stream.cpp
+  cores/esp32/StreamString.cpp
+  cores/esp32/USB.cpp
+  cores/esp32/USBCDC.cpp
+  cores/esp32/wiring_pulse.c
+  cores/esp32/wiring_shift.c
+  cores/esp32/WMath.cpp
+  cores/esp32/WString.cpp
+  )
+
+set(LIBRARY_SRCS
+  libraries/ArduinoOTA/src/ArduinoOTA.cpp
+  libraries/AsyncUDP/src/AsyncUDP.cpp
+  libraries/BluetoothSerial/src/BluetoothSerial.cpp
+  libraries/DNSServer/src/DNSServer.cpp
+  libraries/EEPROM/src/EEPROM.cpp
+  libraries/ESPmDNS/src/ESPmDNS.cpp
+  libraries/FFat/src/FFat.cpp
+  libraries/FS/src/FS.cpp
+  libraries/FS/src/vfs_api.cpp
+  libraries/HTTPClient/src/HTTPClient.cpp
+  libraries/HTTPUpdate/src/HTTPUpdate.cpp
+  libraries/LITTLEFS/src/LITTLEFS.cpp
+  libraries/NetBIOS/src/NetBIOS.cpp
+  libraries/Preferences/src/Preferences.cpp
+  libraries/SD_MMC/src/SD_MMC.cpp
+  libraries/SD/src/SD.cpp
+  libraries/SD/src/sd_diskio.cpp
+  libraries/SD/src/sd_diskio_crc.c
+  libraries/SimpleBLE/src/SimpleBLE.cpp
+  libraries/SPIFFS/src/SPIFFS.cpp
+  libraries/SPI/src/SPI.cpp
+  libraries/Ticker/src/Ticker.cpp
+  libraries/Update/src/Updater.cpp
+  libraries/WebServer/src/WebServer.cpp
+  libraries/WebServer/src/Parsing.cpp
+  libraries/WebServer/src/detail/mimetable.cpp
+  libraries/WiFiClientSecure/src/ssl_client.cpp
+  libraries/WiFiClientSecure/src/WiFiClientSecure.cpp
+  libraries/WiFi/src/ETH.cpp
+  libraries/WiFi/src/WiFiAP.cpp
+  libraries/WiFi/src/WiFiClient.cpp
+  libraries/WiFi/src/WiFi.cpp
+  libraries/WiFi/src/WiFiGeneric.cpp
+  libraries/WiFi/src/WiFiMulti.cpp
+  libraries/WiFi/src/WiFiProv.cpp
+  libraries/WiFi/src/WiFiScan.cpp
+  libraries/WiFi/src/WiFiServer.cpp
+  libraries/WiFi/src/WiFiSTA.cpp
+  libraries/WiFi/src/WiFiUdp.cpp
+  libraries/Wire/src/Wire.cpp
+  )
+
+set(BLE_SRCS
+  libraries/BLE/src/BLE2902.cpp
+  libraries/BLE/src/BLE2904.cpp
+  libraries/BLE/src/BLEAddress.cpp
+  libraries/BLE/src/BLEAdvertisedDevice.cpp
+  libraries/BLE/src/BLEAdvertising.cpp
+  libraries/BLE/src/BLEBeacon.cpp
+  libraries/BLE/src/BLECharacteristic.cpp
+  libraries/BLE/src/BLECharacteristicMap.cpp
+  libraries/BLE/src/BLEClient.cpp
+  libraries/BLE/src/BLEDescriptor.cpp
+  libraries/BLE/src/BLEDescriptorMap.cpp
+  libraries/BLE/src/BLEDevice.cpp
+  libraries/BLE/src/BLEEddystoneTLM.cpp
+  libraries/BLE/src/BLEEddystoneURL.cpp
+  libraries/BLE/src/BLEExceptions.cpp
+  libraries/BLE/src/BLEHIDDevice.cpp
+  libraries/BLE/src/BLERemoteCharacteristic.cpp
+  libraries/BLE/src/BLERemoteDescriptor.cpp
+  libraries/BLE/src/BLERemoteService.cpp
+  libraries/BLE/src/BLEScan.cpp
+  libraries/BLE/src/BLESecurity.cpp
+  libraries/BLE/src/BLEServer.cpp
+  libraries/BLE/src/BLEService.cpp
+  libraries/BLE/src/BLEServiceMap.cpp
+  libraries/BLE/src/BLEUtils.cpp
+  libraries/BLE/src/BLEUUID.cpp
+  libraries/BLE/src/BLEValue.cpp
+  libraries/BLE/src/FreeRTOS.cpp
+  libraries/BLE/src/GeneralUtils.cpp
+  )
+
+
+set(includedirs
+  variants/esp32/
+  cores/esp32/
+  libraries/ArduinoOTA/src
+  libraries/AsyncUDP/src
+  libraries/BLE/src
+  libraries/BluetoothSerial/src
+  libraries/DNSServer/src
+  libraries/EEPROM/src
+  libraries/ESP32/src
+  libraries/ESPmDNS/src
+  libraries/FFat/src
+  libraries/FS/src
+  libraries/HTTPClient/src
+  libraries/HTTPUpdate/src
+  libraries/LITTLEFS/src
+  libraries/NetBIOS/src
+  libraries/Preferences/src
+  libraries/SD_MMC/src
+  libraries/SD/src
+  libraries/SimpleBLE/src
+  libraries/SPIFFS/src
+  libraries/SPI/src
+  libraries/Ticker/src
+  libraries/Update/src
+  libraries/WebServer/src
+  libraries/WiFiClientSecure/src
+  libraries/WiFi/src
+  libraries/Wire/src
+  )
+
+set(srcs ${CORE_SRCS} ${LIBRARY_SRCS} ${BLE_SRCS})
+set(priv_includes cores/esp32/libb64)
+set(requires spi_flash mbedtls mdns esp_adc_cal)
+set(priv_requires fatfs nvs_flash app_update spiffs bootloader_support openssl bt tinyusb main)
+
+idf_component_register(INCLUDE_DIRS ${includedirs} PRIV_INCLUDE_DIRS ${priv_includes} SRCS ${srcs} REQUIRES ${requires} PRIV_REQUIRES ${priv_requires})
+
+if(IDF_TARGET STREQUAL "esp32")
+target_compile_options(${COMPONENT_TARGET} PUBLIC -DARDUINO=10812 -DARDUINO_ESP32_DEV -DARDUINO_ARCH_ESP32 -DARDUINO_BOARD="ESP32_DEV" -DARDUINO_VARIANT="esp32" -DESP32)
+endif()
+if(IDF_TARGET STREQUAL "esp32s2")
+target_compile_options(${COMPONENT_TARGET} PUBLIC -DARDUINO=10812 -DARDUINO_ESP32S2_DEV -DARDUINO_ARCH_ESP32 -DARDUINO_BOARD="ESP32S2_DEV" -DARDUINO_VARIANT="esp32s2" -DESP32)
+endif()

Kconfig.projbuild

@@ -0,0 +1,334 @@
+menu "Arduino Configuration"
+
+config ENABLE_ARDUINO_DEPENDS
+    bool
+    select LWIP_SO_RCVBUF
+    select ETHERNET
+    select WIFI_ENABLED
+    select ESP32_PHY_CALIBRATION_AND_DATA_STORAGE if IDF_TARGET_ESP32
+    select MEMMAP_SMP
+    default "y"
+
+config AUTOSTART_ARDUINO
+    bool "Autostart Arduino setup and loop on boot"
+    default "n"
+    help
+        Enabling this option will implement app_main and start Arduino.
+        All you need to implement in your main.cpp is setup() and loop()
+        and include Arduino.h
+        If disabled, you can call initArduino() to run any preparations
+        required by the framework
+
+choice ARDUINO_RUNNING_CORE
+    bool "Core on which Arduino's setup() and loop() are running"
+    default ARDUINO_RUN_CORE1
+    help
+        Select on which core Arduino's setup() and loop() functions run
+
+    config ARDUINO_RUN_CORE0
+        bool "CORE 0"
+    config ARDUINO_RUN_CORE1
+        bool "CORE 1"
+    config ARDUINO_RUN_NO_AFFINITY
+        bool "BOTH"
+
+endchoice
+
+config ARDUINO_RUNNING_CORE
+    int
+    default 0 if ARDUINO_RUN_CORE0
+    default 1 if ARDUINO_RUN_CORE1
+    default -1 if ARDUINO_RUN_NO_AFFINITY
+
+choice ARDUINO_EVENT_RUNNING_CORE
+    bool "Core on which Arduino's event handler is running"
+    default ARDUINO_EVENT_RUN_CORE1
+    help
+        Select on which core Arduino's WiFi.onEvent() run
+
+    config ARDUINO_EVENT_RUN_CORE0
+        bool "CORE 0"
+    config ARDUINO_EVENT_RUN_CORE1
+        bool "CORE 1"
+    config ARDUINO_EVENT_RUN_NO_AFFINITY
+        bool "BOTH"
+
+endchoice
+
+config ARDUINO_EVENT_RUNNING_CORE
+    int
+    default 0 if ARDUINO_EVENT_RUN_CORE0
+    default 1 if ARDUINO_EVENT_RUN_CORE1
+    default -1 if ARDUINO_EVENT_RUN_NO_AFFINITY
+
+choice ARDUINO_UDP_RUNNING_CORE
+    bool "Core on which Arduino's UDP is running"
+    default ARDUINO_UDP_RUN_CORE1
+    help
+        Select on which core Arduino's UDP run
+
+    config ARDUINO_UDP_RUN_CORE0
+        bool "CORE 0"
+    config ARDUINO_UDP_RUN_CORE1
+        bool "CORE 1"
+    config ARDUINO_UDP_RUN_NO_AFFINITY
+        bool "BOTH"
+
+endchoice
+
+config ARDUINO_UDP_RUNNING_CORE
+    int
+    default 0 if ARDUINO_UDP_RUN_CORE0
+    default 1 if ARDUINO_UDP_RUN_CORE1
+    default -1 if ARDUINO_UDP_RUN_NO_AFFINITY
+
+config ARDUINO_ISR_IRAM
+    bool "Run interrupts in IRAM"
+    default "n"
+    help
+        Enabling this option will Attach all interrupts with the IRAm flag.
+        It will also make some HAL function, like, digitalRead/Write and more
+				be loaded into IRAM for access inside ISRs.
+				Beware that this is a very dangerous setting. Enable it only if you
+				are fully aware of the consequences.
+
+config DISABLE_HAL_LOCKS
+    bool "Disable mutex locks for HAL"
+    default "n"
+    help
+        Enabling this option will run all hardware abstraction without locks.
+        While communication with external hardware will be faster, you need to
+        make sure that there is no option to use the same bus from another thread
+        or interrupt at the same time. Option is best used with Arduino enabled
+        and code implemented only in setup/loop and Arduino callbacks
+
+menu "Debug Log Configuration"
+choice ARDUHAL_LOG_DEFAULT_LEVEL
+    bool "Default log level"
+    default ARDUHAL_LOG_DEFAULT_LEVEL_ERROR
+    help
+        Specify how much output to see in logs by default.
+
+config ARDUHAL_LOG_DEFAULT_LEVEL_NONE
+    bool "No output"
+config ARDUHAL_LOG_DEFAULT_LEVEL_ERROR
+    bool "Error"
+config ARDUHAL_LOG_DEFAULT_LEVEL_WARN
+    bool "Warning"
+config ARDUHAL_LOG_DEFAULT_LEVEL_INFO
+    bool "Info"
+config ARDUHAL_LOG_DEFAULT_LEVEL_DEBUG
+    bool "Debug"
+config ARDUHAL_LOG_DEFAULT_LEVEL_VERBOSE
+    bool "Verbose"
+endchoice
+
+config ARDUHAL_LOG_DEFAULT_LEVEL
+    int
+    default 0 if ARDUHAL_LOG_DEFAULT_LEVEL_NONE
+    default 1 if ARDUHAL_LOG_DEFAULT_LEVEL_ERROR
+    default 2 if ARDUHAL_LOG_DEFAULT_LEVEL_WARN
+    default 3 if ARDUHAL_LOG_DEFAULT_LEVEL_INFO
+    default 4 if ARDUHAL_LOG_DEFAULT_LEVEL_DEBUG
+    default 5 if ARDUHAL_LOG_DEFAULT_LEVEL_VERBOSE
+
+config ARDUHAL_LOG_COLORS
+    bool "Use ANSI terminal colors in log output"
+    default "n"
+    help
+        Enable ANSI terminal color codes in bootloader output.
+        In order to view these, your terminal program must support ANSI color codes.
+
+config ARDUHAL_ESP_LOG
+    bool "Forward ESP_LOGx to Arduino log output"
+    default "n"
+    help
+        This option will redefine the ESP_LOGx macros to Arduino's log_x macros.
+        To enable for your application, add the follwing after your includes:
+        #ifdef ARDUINO_ARCH_ESP32
+        #include "esp32-hal-log.h"
+        #endif
+
+endmenu
+
+choice ARDUHAL_PARTITION_SCHEME
+    bool "Used partition scheme"
+    default ARDUHAL_PARTITION_SCHEME_DEFAULT
+    help
+        Specify which partition scheme to be used.
+
+config ARDUHAL_PARTITION_SCHEME_DEFAULT
+    bool "Default"
+config ARDUHAL_PARTITION_SCHEME_MINIMAL
+    bool "Minimal (for 2MB FLASH)"
+config ARDUHAL_PARTITION_SCHEME_NO_OTA
+    bool "No OTA (for large apps)"
+config ARDUHAL_PARTITION_SCHEME_HUGE_APP
+    bool "Huge App (for very large apps)"
+config ARDUHAL_PARTITION_SCHEME_MIN_SPIFFS
+    bool "Minimal SPIFFS (for large apps with OTA)"
+endchoice
+
+config ARDUHAL_PARTITION_SCHEME
+    string
+    default "default" if ARDUHAL_PARTITION_SCHEME_DEFAULT
+    default "minimal" if ARDUHAL_PARTITION_SCHEME_MINIMAL
+    default "no_ota" if ARDUHAL_PARTITION_SCHEME_NO_OTA
+    default "huge_app" if ARDUHAL_PARTITION_SCHEME_HUGE_APP
+    default "min_spiffs" if ARDUHAL_PARTITION_SCHEME_MIN_SPIFFS
+
+
+config AUTOCONNECT_WIFI
+    bool "Autoconnect WiFi on boot"
+    default "n"
+    depends on AUTOSTART_ARDUINO
+    select ARDUINO_SELECTIVE_WiFi
+    help
+        If enabled, WiFi will connect to the last used SSID (if station was enabled),
+        else connection will be started only after calling WiFi.begin(ssid, password)
+
+config ARDUINO_SELECTIVE_COMPILATION
+    bool "Include only specific Arduino libraries"
+    default n
+
+config ARDUINO_SELECTIVE_ArduinoOTA
+    bool "Enable ArduinoOTA"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_WiFi
+    select ARDUINO_SELECTIVE_ESPmDNS
+    default y
+
+config ARDUINO_SELECTIVE_AsyncUDP
+    bool "Enable AsyncUDP"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_AzureIoT
+    bool "Enable AzureIoT"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_HTTPClient
+    default y
+
+config ARDUINO_SELECTIVE_BLE
+    bool "Enable BLE"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_BluetoothSerial
+    bool "Enable BluetoothSerial"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_DNSServer
+    bool "Enable DNSServer"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_WiFi
+    default y
+
+config ARDUINO_SELECTIVE_EEPROM
+    bool "Enable EEPROM"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_ESP32
+    bool "Enable ESP32"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_ESPmDNS
+    bool "Enable ESPmDNS"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_WiFi
+    default y
+
+config ARDUINO_SELECTIVE_FFat
+    bool "Enable FFat"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_FS
+    default y
+
+config ARDUINO_SELECTIVE_FS
+    bool "Enable FS"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_HTTPClient
+    bool "Enable HTTPClient"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_WiFi
+    select ARDUINO_SELECTIVE_WiFiClientSecure
+    default y
+
+config ARDUINO_SELECTIVE_NetBIOS
+    bool "Enable NetBIOS"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_WiFi
+    default y
+
+config ARDUINO_SELECTIVE_Preferences
+    bool "Enable Preferences"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_SD
+    bool "Enable SD"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_FS
+    default y
+
+config ARDUINO_SELECTIVE_SD_MMC
+    bool "Enable SD_MMC"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_FS
+    default y
+
+config ARDUINO_SELECTIVE_SimpleBLE
+    bool "Enable SimpleBLE"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_SPI
+    bool "Enable SPI"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_SPIFFS
+    bool "Enable SPIFFS"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_FS
+    default y
+
+config ARDUINO_SELECTIVE_Ticker
+    bool "Enable Ticker"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_Update
+    bool "Enable Update"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_WebServer
+    bool "Enable WebServer"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+    select ARDUINO_SELECTIVE_FS
+
+config ARDUINO_SELECTIVE_WiFi
+    bool "Enable WiFi"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+config ARDUINO_SELECTIVE_WiFiClientSecure
+    bool "Enable WiFiClientSecure"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    select ARDUINO_SELECTIVE_WiFi
+    default y
+
+config ARDUINO_SELECTIVE_Wire
+    bool "Enable Wire"
+    depends on ARDUINO_SELECTIVE_COMPILATION
+    default y
+
+
+endmenu

LICENSE.md

@@ -0,0 +1,503 @@
+### GNU LESSER GENERAL PUBLIC LICENSE
+
+Version 2.1, February 1999
+
+    Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+    51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+    
+    Everyone is permitted to copy and distribute verbatim copies
+    of this license document, but changing it is not allowed.
+
+    [This is the first released version of the Lesser GPL.  It also counts
+     as the successor of the GNU Library Public License, version 2, hence
+     the version number 2.1.]
+
+### Preamble
+
+The licenses for most software are designed to take away your freedom
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+
+### How to Apply These Terms to Your New Libraries
+
+If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change. You can do so by permitting
+redistribution under these terms (or, alternatively, under the terms
+of the ordinary General Public License).
+
+To apply these terms, attach the following notices to the library. It
+is safest to attach them to the start of each source file to most
+effectively convey the exclusion of warranty; and each file should
+have at least the "copyright" line and a pointer to where the full
+notice is found.
+
+    one line to give the library's name and an idea of what it does.
+    Copyright (C) year  name of author
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+Also add information on how to contact you by electronic and paper
+mail.
+
+You should also get your employer (if you work as a programmer) or
+your school, if any, to sign a "copyright disclaimer" for the library,
+if necessary. Here is a sample; alter the names:
+
+    Yoyodyne, Inc., hereby disclaims all copyright interest in
+    the library `Frob' (a library for tweaking knobs) written
+    by James Random Hacker.
+
+    signature of Ty Coon, 1 April 1990
+    Ty Coon, President of Vice
+
+That's all there is to it!

Makefile.projbuild

@@ -0,0 +1,7 @@
+BOOT_APP_BIN_ROOT := $(call dequote,$(COMPONENT_PATH))
+
+ifndef CONFIG_PARTITION_TABLE_CUSTOM
+PARTITION_TABLE_CSV_PATH = $(call dequote,$(abspath $(BOOT_APP_BIN_ROOT)/$(subst $(quote),,tools/partitions/$(CONFIG_ARDUHAL_PARTITION_SCHEME).csv)))
+endif
+
+CPPFLAGS += -DARDUINO=10800 -DESP32=1 -DARDUINO_ARCH_ESP32=1 -DBOARD_HAS_PSRAM

_config.yml

@@ -1 +0,0 @@
-theme: jekyll-theme-cayman

component.mk

@@ -0,0 +1,36 @@
+ARDUINO_ALL_LIBRARIES := $(patsubst $(COMPONENT_PATH)/libraries/%,%,$(wildcard $(COMPONENT_PATH)/libraries/*))
+
+# Macro returns non-empty if Arduino library $(1) should be included in the build
+# (either because selective compilation is of, or this library is enabled
+define ARDUINO_LIBRARY_ENABLED
+$(if $(CONFIG_ARDUINO_SELECTIVE_COMPILATION),$(CONFIG_ARDUINO_SELECTIVE_$(1)),y)
+endef
+
+ARDUINO_ENABLED_LIBRARIES := $(foreach LIBRARY,$(sort $(ARDUINO_ALL_LIBRARIES)),$(if $(call ARDUINO_LIBRARY_ENABLED,$(LIBRARY)),$(LIBRARY)))
+
+$(info Arduino libraries in build: $(ARDUINO_ENABLED_LIBRARIES))
+
+# Expand all subdirs under $(1)
+define EXPAND_SUBDIRS
+$(sort $(dir $(wildcard $(1)/* $(1)/*/* $(1)/*/*/* $(1)/*/*/*/* $(1)/*/*/*/*/*)))
+endef
+
+# Macro returns SRCDIRS for library
+define ARDUINO_LIBRARY_GET_SRCDIRS
+	$(if $(wildcard $(COMPONENT_PATH)/libraries/$(1)/src/.), 							\
+		$(call EXPAND_SUBDIRS,$(COMPONENT_PATH)/libraries/$(1)/src), 					\
+		$(filter-out $(call EXPAND_SUBDIRS,$(COMPONENT_PATH)/libraries/$(1)/examples),  \
+			$(call EXPAND_SUBDIRS,$(COMPONENT_PATH)/libraries/$(1)) 				   	\
+		) 																				\
+	)
+endef
+
+# Make a list of all srcdirs in enabled libraries
+ARDUINO_LIBRARY_SRCDIRS := $(patsubst $(COMPONENT_PATH)/%,%,$(foreach LIBRARY,$(ARDUINO_ENABLED_LIBRARIES),$(call ARDUINO_LIBRARY_GET_SRCDIRS,$(LIBRARY))))
+
+#$(info Arduino libraries src dirs: $(ARDUINO_LIBRARY_SRCDIRS))
+
+COMPONENT_ADD_INCLUDEDIRS := cores/esp32 variants/esp32 $(ARDUINO_LIBRARY_SRCDIRS)
+COMPONENT_PRIV_INCLUDEDIRS := cores/esp32/libb64
+COMPONENT_SRCDIRS := cores/esp32/libb64 cores/esp32 variants/esp32 $(ARDUINO_LIBRARY_SRCDIRS)
+CXXFLAGS += -fno-rtti

cores/esp32/Arduino.h

@@ -0,0 +1,189 @@
+/*
+ Arduino.h - Main include file for the Arduino SDK
+ Copyright (c) 2005-2013 Arduino Team.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef Arduino_h
+#define Arduino_h
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/semphr.h"
+#include "esp32-hal.h"
+#include "esp8266-compat.h"
+#include "soc/gpio_reg.h"
+
+#include "stdlib_noniso.h"
+#include "binary.h"
+
+#define PI 3.1415926535897932384626433832795
+#define HALF_PI 1.5707963267948966192313216916398
+#define TWO_PI 6.283185307179586476925286766559
+#define DEG_TO_RAD 0.017453292519943295769236907684886
+#define RAD_TO_DEG 57.295779513082320876798154814105
+#define EULER 2.718281828459045235360287471352
+
+#define SERIAL  0x0
+#define DISPLAY 0x1
+
+#define LSBFIRST 0
+#define MSBFIRST 1
+
+//Interrupt Modes
+#define RISING    0x01
+#define FALLING   0x02
+#define CHANGE    0x03
+#define ONLOW     0x04
+#define ONHIGH    0x05
+#define ONLOW_WE  0x0C
+#define ONHIGH_WE 0x0D
+
+#define DEFAULT 1
+#define EXTERNAL 0
+
+#ifndef __STRINGIFY
+#define __STRINGIFY(a) #a
+#endif
+
+#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
+#define radians(deg) ((deg)*DEG_TO_RAD)
+#define degrees(rad) ((rad)*RAD_TO_DEG)
+#define sq(x) ((x)*(x))
+
+#define sei()
+#define cli()
+#define interrupts() sei()
+#define noInterrupts() cli()
+
+#define clockCyclesPerMicrosecond() ( F_CPU / 1000000L )
+#define clockCyclesToMicroseconds(a) ( (a) / clockCyclesPerMicrosecond() )
+#define microsecondsToClockCycles(a) ( (a) * clockCyclesPerMicrosecond() )
+
+#define lowByte(w) ((uint8_t) ((w) & 0xff))
+#define highByte(w) ((uint8_t) ((w) >> 8))
+
+#define bitRead(value, bit) (((value) >> (bit)) & 0x01)
+#define bitSet(value, bit) ((value) |= (1UL << (bit)))
+#define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
+#define bitWrite(value, bit, bitvalue) (bitvalue ? bitSet(value, bit) : bitClear(value, bit))
+
+// avr-libc defines _NOP() since 1.6.2
+#ifndef _NOP
+#define _NOP() do { __asm__ volatile ("nop"); } while (0)
+#endif
+
+#define bit(b) (1UL << (b))
+#define _BV(b) (1UL << (b))
+
+#define digitalPinToPort(pin)       (((pin)>31)?1:0)
+#define digitalPinToBitMask(pin)    (1UL << (((pin)>31)?((pin)-32):(pin)))
+#define digitalPinToTimer(pin)      (0)
+#define analogInPinToBit(P)         (P)
+#define portOutputRegister(port)    ((volatile uint32_t*)((port)?GPIO_OUT1_REG:GPIO_OUT_REG))
+#define portInputRegister(port)     ((volatile uint32_t*)((port)?GPIO_IN1_REG:GPIO_IN_REG))
+#define portModeRegister(port)      ((volatile uint32_t*)((port)?GPIO_ENABLE1_REG:GPIO_ENABLE_REG))
+
+#define NOT_A_PIN -1
+#define NOT_A_PORT -1
+#define NOT_AN_INTERRUPT -1
+#define NOT_ON_TIMER 0
+
+typedef bool boolean;
+typedef uint8_t byte;
+typedef unsigned int word;
+
+#ifdef __cplusplus
+void setup(void);
+void loop(void);
+
+long random(long, long);
+#endif
+void randomSeed(unsigned long);
+long map(long, long, long, long, long);
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void init(void);
+void initVariant(void);
+void initArduino(void);
+
+unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout);
+unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout);
+
+uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder);
+void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val);
+
+#ifdef __cplusplus
+}
+
+#include <algorithm>
+#include <cmath>
+
+#include "WCharacter.h"
+#include "WString.h"
+#include "Stream.h"
+#include "Printable.h"
+#include "Print.h"
+#include "IPAddress.h"
+#include "Client.h"
+#include "Server.h"
+#include "Udp.h"
+#include "HardwareSerial.h"
+#include "Esp.h"
+
+using std::abs;
+using std::isinf;
+using std::isnan;
+using std::max;
+using std::min;
+using ::round;
+
+uint16_t makeWord(uint16_t w);
+uint16_t makeWord(byte h, byte l);
+
+#define word(...) makeWord(__VA_ARGS__)
+
+unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout = 1000000L);
+unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout = 1000000L);
+
+extern "C" bool getLocalTime(struct tm * info, uint32_t ms = 5000);
+extern "C" void configTime(long gmtOffset_sec, int daylightOffset_sec,
+        const char* server1, const char* server2 = nullptr, const char* server3 = nullptr);
+extern "C" void configTzTime(const char* tz,
+        const char* server1, const char* server2 = nullptr, const char* server3 = nullptr);
+
+// WMath prototypes
+long random(long);
+#endif /* __cplusplus */
+
+#define _min(a,b) ((a)<(b)?(a):(b))
+#define _max(a,b) ((a)>(b)?(a):(b))
+
+#include "pins_arduino.h"
+
+#endif /* _ESP32_CORE_ARDUINO_H_ */

cores/esp32/Client.h

@@ -0,0 +1,48 @@
+/*
+ Client.h - Base class that provides Client
+ Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef client_h
+#define client_h
+#include "Print.h"
+#include "Stream.h"
+#include "IPAddress.h"
+
+class Client: public Stream
+{
+public:
+    virtual int connect(IPAddress ip, uint16_t port) =0;
+    virtual int connect(const char *host, uint16_t port) =0;
+    virtual size_t write(uint8_t) =0;
+    virtual size_t write(const uint8_t *buf, size_t size) =0;
+    virtual int available() = 0;
+    virtual int read() = 0;
+    virtual int read(uint8_t *buf, size_t size) = 0;
+    virtual int peek() = 0;
+    virtual void flush() = 0;
+    virtual void stop() = 0;
+    virtual uint8_t connected() = 0;
+    virtual operator bool() = 0;
+protected:
+    uint8_t* rawIPAddress(IPAddress& addr)
+    {
+        return addr.raw_address();
+    }
+};
+
+#endif

cores/esp32/Esp.cpp

@@ -0,0 +1,342 @@
+/*
+ Esp.cpp - ESP31B-specific APIs
+ Copyright (c) 2015 Ivan Grokhotkov. All rights reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "Arduino.h"
+#include "Esp.h"
+#include "esp_sleep.h"
+#include "esp_spi_flash.h"
+#include <memory>
+#include <soc/soc.h>
+#include <soc/efuse_reg.h>
+#include <esp_partition.h>
+extern "C" {
+#include "esp_ota_ops.h"
+#include "esp_image_format.h"
+}
+#include <MD5Builder.h>
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/spi_flash.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/spi_flash.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/spi_flash.h"
+#endif
+
+/**
+ * User-defined Literals
+ *  usage:
+ *
+ *   uint32_t = test = 10_MHz; // --> 10000000
+ */
+
+unsigned long long operator"" _kHz(unsigned long long x)
+{
+    return x * 1000;
+}
+
+unsigned long long operator"" _MHz(unsigned long long x)
+{
+    return x * 1000 * 1000;
+}
+
+unsigned long long operator"" _GHz(unsigned long long x)
+{
+    return x * 1000 * 1000 * 1000;
+}
+
+unsigned long long operator"" _kBit(unsigned long long x)
+{
+    return x * 1024;
+}
+
+unsigned long long operator"" _MBit(unsigned long long x)
+{
+    return x * 1024 * 1024;
+}
+
+unsigned long long operator"" _GBit(unsigned long long x)
+{
+    return x * 1024 * 1024 * 1024;
+}
+
+unsigned long long operator"" _kB(unsigned long long x)
+{
+    return x * 1024;
+}
+
+unsigned long long operator"" _MB(unsigned long long x)
+{
+    return x * 1024 * 1024;
+}
+
+unsigned long long operator"" _GB(unsigned long long x)
+{
+    return x * 1024 * 1024 * 1024;
+}
+
+
+EspClass ESP;
+
+void EspClass::deepSleep(uint32_t time_us)
+{
+    esp_deep_sleep(time_us);
+}
+
+void EspClass::restart(void)
+{
+    esp_restart();
+}
+
+uint32_t EspClass::getHeapSize(void)
+{
+    multi_heap_info_t info;
+    heap_caps_get_info(&info, MALLOC_CAP_INTERNAL);
+    return info.total_free_bytes + info.total_allocated_bytes;
+}
+
+uint32_t EspClass::getFreeHeap(void)
+{
+    return heap_caps_get_free_size(MALLOC_CAP_INTERNAL);
+}
+
+uint32_t EspClass::getMinFreeHeap(void)
+{
+    return heap_caps_get_minimum_free_size(MALLOC_CAP_INTERNAL);
+}
+
+uint32_t EspClass::getMaxAllocHeap(void)
+{
+    return heap_caps_get_largest_free_block(MALLOC_CAP_INTERNAL);
+}
+
+uint32_t EspClass::getPsramSize(void)
+{
+	if(psramFound()){
+	    multi_heap_info_t info;
+	    heap_caps_get_info(&info, MALLOC_CAP_SPIRAM);
+	    return info.total_free_bytes + info.total_allocated_bytes;
+	}
+	return 0;
+}
+
+uint32_t EspClass::getFreePsram(void)
+{
+	if(psramFound()){
+	    return heap_caps_get_free_size(MALLOC_CAP_SPIRAM);
+	}
+	return 0;
+}
+
+uint32_t EspClass::getMinFreePsram(void)
+{
+	if(psramFound()){
+	    return heap_caps_get_minimum_free_size(MALLOC_CAP_SPIRAM);
+	}
+	return 0;
+}
+
+uint32_t EspClass::getMaxAllocPsram(void)
+{
+	if(psramFound()){
+	    return heap_caps_get_largest_free_block(MALLOC_CAP_SPIRAM);
+	}
+	return 0;
+}
+
+static uint32_t sketchSize(sketchSize_t response) {
+    esp_image_metadata_t data;
+    const esp_partition_t *running = esp_ota_get_running_partition();
+    if (!running) return 0;
+    const esp_partition_pos_t running_pos  = {
+        .offset = running->address,
+        .size = running->size,
+    };
+    data.start_addr = running_pos.offset;
+    esp_image_verify(ESP_IMAGE_VERIFY, &running_pos, &data);
+    if (response) {
+        return running_pos.size - data.image_len;
+    } else {
+        return data.image_len;
+    }
+}
+    
+uint32_t EspClass::getSketchSize () {
+    return sketchSize(SKETCH_SIZE_TOTAL);
+}
+
+String EspClass::getSketchMD5()
+{
+    static String result;
+    if (result.length()) {
+        return result;
+    }
+    uint32_t lengthLeft = getSketchSize();
+
+    const esp_partition_t *running = esp_ota_get_running_partition();
+    if (!running) {
+        log_e("Partition could not be found");
+
+        return String();
+    }
+    const size_t bufSize = SPI_FLASH_SEC_SIZE;
+    std::unique_ptr<uint8_t[]> buf(new uint8_t[bufSize]);
+    uint32_t offset = 0;
+    if(!buf.get()) {
+        log_e("Not enough memory to allocate buffer");
+
+        return String();
+    }
+    MD5Builder md5;
+    md5.begin();
+    while( lengthLeft > 0) {
+        size_t readBytes = (lengthLeft < bufSize) ? lengthLeft : bufSize;
+        if (!ESP.flashRead(running->address + offset, reinterpret_cast<uint32_t*>(buf.get()), (readBytes + 3) & ~3)) {
+            log_e("Could not read buffer from flash");
+
+            return String();
+        }
+        md5.add(buf.get(), readBytes);
+        lengthLeft -= readBytes;
+        offset += readBytes;
+    }
+    md5.calculate();
+    result = md5.toString();
+    return result;
+}
+
+uint32_t EspClass::getFreeSketchSpace () {
+    const esp_partition_t* _partition = esp_ota_get_next_update_partition(NULL);
+    if(!_partition){
+        return 0;
+    }
+
+    return _partition->size;
+}
+
+uint8_t EspClass::getChipRevision(void)
+{
+    esp_chip_info_t chip_info;
+    esp_chip_info(&chip_info);
+    return chip_info.revision;
+}
+
+const char * EspClass::getSdkVersion(void)
+{
+    return esp_get_idf_version();
+}
+
+uint32_t EspClass::getFlashChipSize(void)
+{
+    esp_image_header_t fhdr;
+    if(flashRead(0x1000, (uint32_t*)&fhdr, sizeof(esp_image_header_t)) && fhdr.magic != ESP_IMAGE_HEADER_MAGIC) {
+        return 0;
+    }
+    return magicFlashChipSize(fhdr.spi_size);
+}
+
+uint32_t EspClass::getFlashChipSpeed(void)
+{
+    esp_image_header_t fhdr;
+    if(flashRead(0x1000, (uint32_t*)&fhdr, sizeof(esp_image_header_t)) && fhdr.magic != ESP_IMAGE_HEADER_MAGIC) {
+        return 0;
+    }
+    return magicFlashChipSpeed(fhdr.spi_speed);
+}
+
+FlashMode_t EspClass::getFlashChipMode(void)
+{
+    esp_image_header_t fhdr;
+    if(flashRead(0x1000, (uint32_t*)&fhdr, sizeof(esp_image_header_t)) && fhdr.magic != ESP_IMAGE_HEADER_MAGIC) {
+        return FM_UNKNOWN;
+    }
+    return magicFlashChipMode(fhdr.spi_mode);
+}
+
+uint32_t EspClass::magicFlashChipSize(uint8_t byte)
+{
+    switch(byte & 0x0F) {
+    case 0x0: // 8 MBit (1MB)
+        return (1_MB);
+    case 0x1: // 16 MBit (2MB)
+        return (2_MB);
+    case 0x2: // 32 MBit (4MB)
+        return (4_MB);
+    case 0x3: // 64 MBit (8MB)
+        return (8_MB);
+    case 0x4: // 128 MBit (16MB)
+        return (16_MB);
+    default: // fail?
+        return 0;
+    }
+}
+
+uint32_t EspClass::magicFlashChipSpeed(uint8_t byte)
+{
+    switch(byte & 0x0F) {
+    case 0x0: // 40 MHz
+        return (40_MHz);
+    case 0x1: // 26 MHz
+        return (26_MHz);
+    case 0x2: // 20 MHz
+        return (20_MHz);
+    case 0xf: // 80 MHz
+        return (80_MHz);
+    default: // fail?
+        return 0;
+    }
+}
+
+FlashMode_t EspClass::magicFlashChipMode(uint8_t byte)
+{
+    FlashMode_t mode = (FlashMode_t) byte;
+    if(mode > FM_SLOW_READ) {
+        mode = FM_UNKNOWN;
+    }
+    return mode;
+}
+
+bool EspClass::flashEraseSector(uint32_t sector)
+{
+    return spi_flash_erase_sector(sector) == ESP_OK;
+}
+
+// Warning: These functions do not work with encrypted flash
+bool EspClass::flashWrite(uint32_t offset, uint32_t *data, size_t size)
+{
+    return spi_flash_write(offset, (uint32_t*) data, size) == ESP_OK;
+}
+
+bool EspClass::flashRead(uint32_t offset, uint32_t *data, size_t size)
+{
+    return spi_flash_read(offset, (uint32_t*) data, size) == ESP_OK;
+}
+
+
+uint64_t EspClass::getEfuseMac(void)
+{
+    uint64_t _chipmacid = 0LL;
+    esp_efuse_mac_get_default((uint8_t*) (&_chipmacid));
+    return _chipmacid;
+}

cores/esp32/Esp.h

@@ -0,0 +1,113 @@
+/*
+ Esp.h - ESP31B-specific APIs
+ Copyright (c) 2015 Ivan Grokhotkov. All rights reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef ESP_H
+#define ESP_H
+
+#include <Arduino.h>
+
+/**
+ * AVR macros for WDT managment
+ */
+typedef enum {
+    WDTO_0MS    = 0,   //!< WDTO_0MS
+    WDTO_15MS   = 15,  //!< WDTO_15MS
+    WDTO_30MS   = 30,  //!< WDTO_30MS
+    WDTO_60MS   = 60,  //!< WDTO_60MS
+    WDTO_120MS  = 120, //!< WDTO_120MS
+    WDTO_250MS  = 250, //!< WDTO_250MS
+    WDTO_500MS  = 500, //!< WDTO_500MS
+    WDTO_1S     = 1000,//!< WDTO_1S
+    WDTO_2S     = 2000,//!< WDTO_2S
+    WDTO_4S     = 4000,//!< WDTO_4S
+    WDTO_8S     = 8000 //!< WDTO_8S
+} WDTO_t;
+
+
+typedef enum {
+    FM_QIO = 0x00,
+    FM_QOUT = 0x01,
+    FM_DIO = 0x02,
+    FM_DOUT = 0x03,
+    FM_FAST_READ = 0x04,
+    FM_SLOW_READ = 0x05,
+    FM_UNKNOWN = 0xff
+} FlashMode_t;
+
+typedef enum {
+    SKETCH_SIZE_TOTAL = 0,
+    SKETCH_SIZE_FREE = 1
+} sketchSize_t;
+
+class EspClass
+{
+public:
+    EspClass() {}
+    ~EspClass() {}
+    void restart();
+
+    //Internal RAM
+    uint32_t getHeapSize(); //total heap size
+    uint32_t getFreeHeap(); //available heap
+    uint32_t getMinFreeHeap(); //lowest level of free heap since boot
+    uint32_t getMaxAllocHeap(); //largest block of heap that can be allocated at once
+
+    //SPI RAM
+    uint32_t getPsramSize();
+    uint32_t getFreePsram();
+    uint32_t getMinFreePsram();
+    uint32_t getMaxAllocPsram();
+
+    uint8_t getChipRevision();
+    uint32_t getCpuFreqMHz(){ return getCpuFrequencyMhz(); }
+    inline uint32_t getCycleCount() __attribute__((always_inline));
+    const char * getSdkVersion();
+
+    void deepSleep(uint32_t time_us);
+
+    uint32_t getFlashChipSize();
+    uint32_t getFlashChipSpeed();
+    FlashMode_t getFlashChipMode();
+
+    uint32_t magicFlashChipSize(uint8_t byte);
+    uint32_t magicFlashChipSpeed(uint8_t byte);
+    FlashMode_t magicFlashChipMode(uint8_t byte);
+
+    uint32_t getSketchSize();
+    String getSketchMD5();
+    uint32_t getFreeSketchSpace();
+
+    bool flashEraseSector(uint32_t sector);
+    bool flashWrite(uint32_t offset, uint32_t *data, size_t size);
+    bool flashRead(uint32_t offset, uint32_t *data, size_t size);
+
+    uint64_t getEfuseMac();
+
+};
+
+uint32_t ARDUINO_ISR_ATTR EspClass::getCycleCount()
+{
+    uint32_t ccount;
+    __asm__ __volatile__("esync; rsr %0,ccount":"=a" (ccount));
+    return ccount;
+}
+
+extern EspClass ESP;
+
+#endif //ESP_H

cores/esp32/FunctionalInterrupt.cpp

@@ -0,0 +1,44 @@
+/*
+ * FunctionalInterrupt.cpp
+ *
+ *  Created on: 8 jul. 2018
+ *      Author: Herman
+ */
+
+#include "FunctionalInterrupt.h"
+#include "Arduino.h"
+
+typedef void (*voidFuncPtr)(void);
+typedef void (*voidFuncPtrArg)(void*);
+
+extern "C"
+{
+	extern void __attachInterruptFunctionalArg(uint8_t pin, voidFuncPtrArg userFunc, void * arg, int intr_type, bool functional);
+}
+
+void ARDUINO_ISR_ATTR interruptFunctional(void* arg)
+{
+    InterruptArgStructure* localArg = (InterruptArgStructure*)arg;
+	if (localArg->interruptFunction)
+	{
+	  localArg->interruptFunction();
+	}
+}
+
+void attachInterrupt(uint8_t pin, std::function<void(void)> intRoutine, int mode)
+{
+	// use the local interrupt routine which takes the ArgStructure as argument
+	__attachInterruptFunctionalArg (pin, (voidFuncPtrArg)interruptFunctional, new InterruptArgStructure{intRoutine}, mode, true);
+}
+
+extern "C"
+{
+   void cleanupFunctional(void* arg)
+   {
+	 delete (InterruptArgStructure*)arg;
+   }
+}
+
+
+
+

cores/esp32/FunctionalInterrupt.h

@@ -0,0 +1,20 @@
+/*
+ * FunctionalInterrupt.h
+ *
+ *  Created on: 8 jul. 2018
+ *      Author: Herman
+ */
+
+#ifndef CORE_CORE_FUNCTIONALINTERRUPT_H_
+#define CORE_CORE_FUNCTIONALINTERRUPT_H_
+
+#include <functional>
+
+struct InterruptArgStructure {
+	std::function<void(void)> interruptFunction;
+};
+
+void attachInterrupt(uint8_t pin, std::function<void(void)> intRoutine, int mode);
+
+
+#endif /* CORE_CORE_FUNCTIONALINTERRUPT_H_ */

cores/esp32/HardwareSerial.cpp

@@ -0,0 +1,207 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "pins_arduino.h"
+#include "HardwareSerial.h"
+
+#if CONFIG_IDF_TARGET_ESP32
+
+#ifndef RX1
+#define RX1 9
+#endif
+
+#ifndef TX1
+#define TX1 10
+#endif
+
+#ifndef RX2
+#define RX2 16
+#endif
+
+#ifndef TX2
+#define TX2 17
+#endif
+
+#else
+
+#ifndef RX1
+#define RX1 18
+#endif
+
+#ifndef TX1
+#define TX1 17
+#endif
+
+#endif
+
+#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
+#if ARDUINO_SERIAL_PORT //Serial used for USB CDC
+HardwareSerial Serial0(0);
+#else
+HardwareSerial Serial(0);
+#endif
+HardwareSerial Serial1(1);
+#if CONFIG_IDF_TARGET_ESP32
+HardwareSerial Serial2(2);
+#endif
+#endif
+
+HardwareSerial::HardwareSerial(int uart_nr) : _uart_nr(uart_nr), _uart(NULL) {}
+
+void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin, bool invert, unsigned long timeout_ms)
+{
+    if(0 > _uart_nr || _uart_nr > 2) {
+        log_e("Serial number is invalid, please use 0, 1 or 2");
+        return;
+    }
+    if(_uart) {
+        end();
+    }
+    if(_uart_nr == 0 && rxPin < 0 && txPin < 0) {
+#if CONFIG_IDF_TARGET_ESP32
+        rxPin = 3;
+        txPin = 1;
+#elif CONFIG_IDF_TARGET_ESP32S2
+        rxPin = 44;
+        txPin = 43;
+#endif
+    }
+    if(_uart_nr == 1 && rxPin < 0 && txPin < 0) {
+        rxPin = RX1;
+        txPin = TX1;
+    }
+#if CONFIG_IDF_TARGET_ESP32
+    if(_uart_nr == 2 && rxPin < 0 && txPin < 0) {
+        rxPin = RX2;
+        txPin = TX2;
+    }
+#endif
+    _uart = uartBegin(_uart_nr, baud ? baud : 9600, config, rxPin, txPin, 256, invert);
+
+    if(!baud) {
+        uartStartDetectBaudrate(_uart);
+        time_t startMillis = millis();
+        unsigned long detectedBaudRate = 0;
+        while(millis() - startMillis < timeout_ms && !(detectedBaudRate = uartDetectBaudrate(_uart))) {
+            yield();
+        }
+
+        end();
+
+        if(detectedBaudRate) {
+            delay(100); // Give some time...
+            _uart = uartBegin(_uart_nr, detectedBaudRate, config, rxPin, txPin, 256, invert);
+        } else {
+            log_e("Could not detect baudrate. Serial data at the port must be present within the timeout for detection to be possible");
+            _uart = NULL;
+        }
+    }
+}
+
+void HardwareSerial::updateBaudRate(unsigned long baud)
+{
+	uartSetBaudRate(_uart, baud);
+}
+
+void HardwareSerial::end()
+{
+    if(uartGetDebug() == _uart_nr) {
+        uartSetDebug(0);
+    }
+    uartEnd(_uart);
+    _uart = 0;
+}
+
+size_t HardwareSerial::setRxBufferSize(size_t new_size) {
+    return uartResizeRxBuffer(_uart, new_size);
+}
+
+void HardwareSerial::setDebugOutput(bool en)
+{
+    if(_uart == 0) {
+        return;
+    }
+    if(en) {
+        uartSetDebug(_uart);
+    } else {
+        if(uartGetDebug() == _uart_nr) {
+            uartSetDebug(NULL);
+        }
+    }
+}
+
+int HardwareSerial::available(void)
+{
+    return uartAvailable(_uart);
+}
+int HardwareSerial::availableForWrite(void)
+{
+    return uartAvailableForWrite(_uart);
+}
+
+int HardwareSerial::peek(void)
+{
+    if (available()) {
+        return uartPeek(_uart);
+    }
+    return -1;
+}
+
+int HardwareSerial::read(void)
+{
+    if(available()) {
+        return uartRead(_uart);
+    }
+    return -1;
+}
+
+// read characters into buffer
+// terminates if size characters have been read, or no further are pending
+// returns the number of characters placed in the buffer
+// the buffer is NOT null terminated.
+size_t HardwareSerial::read(uint8_t *buffer, size_t size)
+{
+    size_t avail = available();
+    if (size < avail) {
+        avail = size;
+    }
+    size_t count = 0;
+    while(count < avail) {
+        *buffer++ = uartRead(_uart);
+        count++;
+    }
+    return count;
+}
+
+void HardwareSerial::flush(void)
+{
+    uartFlush(_uart);
+}
+
+void HardwareSerial::flush(bool txOnly)
+{
+    uartFlushTxOnly(_uart, txOnly);
+}
+
+size_t HardwareSerial::write(uint8_t c)
+{
+    uartWrite(_uart, c);
+    return 1;
+}
+
+size_t HardwareSerial::write(const uint8_t *buffer, size_t size)
+{
+    uartWriteBuf(_uart, buffer, size);
+    return size;
+}
+uint32_t  HardwareSerial::baudRate()
+
+{
+	return uartGetBaudRate(_uart);
+}
+HardwareSerial::operator bool() const
+{
+    return true;
+}

cores/esp32/HardwareSerial.h

@@ -0,0 +1,128 @@
+/*
+ HardwareSerial.h - Hardware serial library for Wiring
+ Copyright (c) 2006 Nicholas Zambetti.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+ Modified 28 September 2010 by Mark Sproul
+ Modified 14 August 2012 by Alarus
+ Modified 3 December 2013 by Matthijs Kooijman
+ Modified 18 December 2014 by Ivan Grokhotkov (esp8266 platform support)
+ Modified 31 March 2015 by Markus Sattler (rewrite the code for UART0 + UART1 support in ESP8266)
+ Modified 25 April 2015 by Thomas Flayols (add configuration different from 8N1 in ESP8266)
+ Modified 13 October 2018 by Jeroen Döll (add baudrate detection)
+ Baudrate detection example usage (detection on Serial1):
+   void setup() {
+     Serial.begin(115200);
+     delay(100);
+     Serial.println();
+
+     Serial1.begin(0, SERIAL_8N1, -1, -1, true, 11000UL);  // Passing 0 for baudrate to detect it, the last parameter is a timeout in ms
+
+     unsigned long detectedBaudRate = Serial1.baudRate();
+     if(detectedBaudRate) {
+       Serial.printf("Detected baudrate is %lu\n", detectedBaudRate);
+     } else {
+       Serial.println("No baudrate detected, Serial1 will not work!");
+     }
+   }
+
+ Pay attention: the baudrate returned by baudRate() may be rounded, eg 115200 returns 115201
+ */
+
+#ifndef HardwareSerial_h
+#define HardwareSerial_h
+
+#include <inttypes.h>
+
+#include "Stream.h"
+#include "esp32-hal.h"
+
+class HardwareSerial: public Stream
+{
+public:
+    HardwareSerial(int uart_nr);
+
+    void begin(unsigned long baud, uint32_t config=SERIAL_8N1, int8_t rxPin=-1, int8_t txPin=-1, bool invert=false, unsigned long timeout_ms = 20000UL);
+    void end();
+    void updateBaudRate(unsigned long baud);
+    int available(void);
+    int availableForWrite(void);
+    int peek(void);
+    int read(void);
+    size_t read(uint8_t *buffer, size_t size);
+    inline size_t read(char * buffer, size_t size)
+    {
+        return read((uint8_t*) buffer, size);
+    }
+    void flush(void);
+    void flush( bool txOnly);
+    size_t write(uint8_t);
+    size_t write(const uint8_t *buffer, size_t size);
+    inline size_t write(const char * buffer, size_t size)
+    {
+        return write((uint8_t*) buffer, size);
+    }
+    inline size_t write(const char * s)
+    {
+        return write((uint8_t*) s, strlen(s));
+    }
+    inline size_t write(unsigned long n)
+    {
+        return write((uint8_t) n);
+    }
+    inline size_t write(long n)
+    {
+        return write((uint8_t) n);
+    }
+    inline size_t write(unsigned int n)
+    {
+        return write((uint8_t) n);
+    }
+    inline size_t write(int n)
+    {
+        return write((uint8_t) n);
+    }
+    uint32_t baudRate();
+    operator bool() const;
+
+    size_t setRxBufferSize(size_t);
+    void setDebugOutput(bool);
+
+protected:
+    int _uart_nr;
+    uart_t* _uart;
+};
+
+extern void serialEventRun(void) __attribute__((weak));
+
+#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
+#ifndef ARDUINO_SERIAL_PORT
+#define ARDUINO_SERIAL_PORT 0
+#endif
+#if ARDUINO_SERIAL_PORT //Serial used for USB CDC
+#include "USB.h"
+#include "USBCDC.h"
+extern HardwareSerial Serial0;
+#else
+extern HardwareSerial Serial;
+#endif
+extern HardwareSerial Serial1;
+#if CONFIG_IDF_TARGET_ESP32
+extern HardwareSerial Serial2;
+#endif
+#endif
+
+#endif // HardwareSerial_h

cores/esp32/IPAddress.cpp

@@ -0,0 +1,122 @@
+/*
+ IPAddress.cpp - Base class that provides IPAddress
+ Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <Arduino.h>
+#include <IPAddress.h>
+#include <Print.h>
+
+IPAddress::IPAddress()
+{
+    _address.dword = 0;
+}
+
+IPAddress::IPAddress(uint8_t first_octet, uint8_t second_octet, uint8_t third_octet, uint8_t fourth_octet)
+{
+    _address.bytes[0] = first_octet;
+    _address.bytes[1] = second_octet;
+    _address.bytes[2] = third_octet;
+    _address.bytes[3] = fourth_octet;
+}
+
+IPAddress::IPAddress(uint32_t address)
+{
+    _address.dword = address;
+}
+
+IPAddress::IPAddress(const uint8_t *address)
+{
+    memcpy(_address.bytes, address, sizeof(_address.bytes));
+}
+
+IPAddress& IPAddress::operator=(const uint8_t *address)
+{
+    memcpy(_address.bytes, address, sizeof(_address.bytes));
+    return *this;
+}
+
+IPAddress& IPAddress::operator=(uint32_t address)
+{
+    _address.dword = address;
+    return *this;
+}
+
+bool IPAddress::operator==(const uint8_t* addr) const
+{
+    return memcmp(addr, _address.bytes, sizeof(_address.bytes)) == 0;
+}
+
+size_t IPAddress::printTo(Print& p) const
+{
+    size_t n = 0;
+    for(int i = 0; i < 3; i++) {
+        n += p.print(_address.bytes[i], DEC);
+        n += p.print('.');
+    }
+    n += p.print(_address.bytes[3], DEC);
+    return n;
+}
+
+String IPAddress::toString() const
+{
+    char szRet[16];
+    sprintf(szRet,"%u.%u.%u.%u", _address.bytes[0], _address.bytes[1], _address.bytes[2], _address.bytes[3]);
+    return String(szRet);
+}
+
+bool IPAddress::fromString(const char *address)
+{
+    // TODO: add support for "a", "a.b", "a.b.c" formats
+
+    uint16_t acc = 0; // Accumulator
+    uint8_t dots = 0;
+
+    while (*address)
+    {
+        char c = *address++;
+        if (c >= '0' && c <= '9')
+        {
+            acc = acc * 10 + (c - '0');
+            if (acc > 255) {
+                // Value out of [0..255] range
+                return false;
+            }
+        }
+        else if (c == '.')
+        {
+            if (dots == 3) {
+                // Too much dots (there must be 3 dots)
+                return false;
+            }
+            _address.bytes[dots++] = acc;
+            acc = 0;
+        }
+        else
+        {
+            // Invalid char
+            return false;
+        }
+    }
+
+    if (dots != 3) {
+        // Too few dots (there must be 3 dots)
+        return false;
+    }
+    _address.bytes[3] = acc;
+    return true;
+}

cores/esp32/IPAddress.h

@@ -0,0 +1,96 @@
+/*
+ IPAddress.h - Base class that provides IPAddress
+ Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef IPAddress_h
+#define IPAddress_h
+
+#include <stdint.h>
+#include <WString.h>
+#include <Printable.h>
+
+// A class to make it easier to handle and pass around IP addresses
+
+class IPAddress: public Printable
+{
+private:
+    union {
+        uint8_t bytes[4];  // IPv4 address
+        uint32_t dword;
+    } _address;
+
+    // Access the raw byte array containing the address.  Because this returns a pointer
+    // to the internal structure rather than a copy of the address this function should only
+    // be used when you know that the usage of the returned uint8_t* will be transient and not
+    // stored.
+    uint8_t* raw_address()
+    {
+        return _address.bytes;
+    }
+
+public:
+    // Constructors
+    IPAddress();
+    IPAddress(uint8_t first_octet, uint8_t second_octet, uint8_t third_octet, uint8_t fourth_octet);
+    IPAddress(uint32_t address);
+    IPAddress(const uint8_t *address);
+    virtual ~IPAddress() {}
+
+    bool fromString(const char *address);
+    bool fromString(const String &address) { return fromString(address.c_str()); }
+
+    // Overloaded cast operator to allow IPAddress objects to be used where a pointer
+    // to a four-byte uint8_t array is expected
+    operator uint32_t() const
+    {
+        return _address.dword;
+    }
+    bool operator==(const IPAddress& addr) const
+    {
+        return _address.dword == addr._address.dword;
+    }
+    bool operator==(const uint8_t* addr) const;
+
+    // Overloaded index operator to allow getting and setting individual octets of the address
+    uint8_t operator[](int index) const
+    {
+        return _address.bytes[index];
+    }
+    uint8_t& operator[](int index)
+    {
+        return _address.bytes[index];
+    }
+
+    // Overloaded copy operators to allow initialisation of IPAddress objects from other types
+    IPAddress& operator=(const uint8_t *address);
+    IPAddress& operator=(uint32_t address);
+
+    virtual size_t printTo(Print& p) const;
+    String toString() const;
+
+    friend class EthernetClass;
+    friend class UDP;
+    friend class Client;
+    friend class Server;
+    friend class DhcpClass;
+    friend class DNSClient;
+};
+
+const IPAddress INADDR_NONE(0, 0, 0, 0);
+
+#endif

cores/esp32/IPv6Address.cpp

@@ -0,0 +1,90 @@
+/*
+ IPv6Address.cpp - Base class that provides IPv6Address
+ Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <Arduino.h>
+#include <IPv6Address.h>
+#include <Print.h>
+
+IPv6Address::IPv6Address()
+{
+    memset(_address.bytes, 0, sizeof(_address.bytes));
+}
+
+IPv6Address::IPv6Address(const uint8_t *address)
+{
+    memcpy(_address.bytes, address, sizeof(_address.bytes));
+}
+
+IPv6Address::IPv6Address(const uint32_t *address)
+{
+    memcpy(_address.bytes, (const uint8_t *)address, sizeof(_address.bytes));
+}
+
+IPv6Address& IPv6Address::operator=(const uint8_t *address)
+{
+    memcpy(_address.bytes, address, sizeof(_address.bytes));
+    return *this;
+}
+
+bool IPv6Address::operator==(const uint8_t* addr) const
+{
+    return memcmp(addr, _address.bytes, sizeof(_address.bytes)) == 0;
+}
+
+size_t IPv6Address::printTo(Print& p) const
+{
+    size_t n = 0;
+    for(int i = 0; i < 16; i+=2) {
+        if(i){
+            n += p.print(':');
+        }
+        n += p.printf("%02x", _address.bytes[i]);
+        n += p.printf("%02x", _address.bytes[i+1]);
+
+    }
+    return n;
+}
+
+String IPv6Address::toString() const
+{
+    char szRet[40];
+    sprintf(szRet,"%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
+            _address.bytes[0], _address.bytes[1], _address.bytes[2], _address.bytes[3],
+            _address.bytes[4], _address.bytes[5], _address.bytes[6], _address.bytes[7],
+            _address.bytes[8], _address.bytes[9], _address.bytes[10], _address.bytes[11],
+            _address.bytes[12], _address.bytes[13], _address.bytes[14], _address.bytes[15]);
+    return String(szRet);
+}
+
+bool IPv6Address::fromString(const char *address)
+{
+    //format 0011:2233:4455:6677:8899:aabb:ccdd:eeff
+    if(strlen(address) != 39){
+        return false;
+    }
+    char * pos = (char *)address;
+    size_t i = 0;
+    for(i = 0; i < 16; i+=2) {
+        if(!sscanf(pos, "%2hhx", &_address.bytes[i]) || !sscanf(pos+2, "%2hhx", &_address.bytes[i+1])){
+            return false;
+        }
+        pos += 5;
+    }
+    return true;
+}

cores/esp32/IPv6Address.h

@@ -0,0 +1,94 @@
+/*
+ IPv6Address.h - Base class that provides IPv6Address
+ Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef IPv6Address_h
+#define IPv6Address_h
+
+#include <stdint.h>
+#include <WString.h>
+#include <Printable.h>
+
+// A class to make it easier to handle and pass around IP addresses
+
+class IPv6Address: public Printable
+{
+private:
+    union {
+        uint8_t bytes[16];  // IPv4 address
+        uint32_t dword[4];
+    } _address;
+
+    // Access the raw byte array containing the address.  Because this returns a pointer
+    // to the internal structure rather than a copy of the address this function should only
+    // be used when you know that the usage of the returned uint8_t* will be transient and not
+    // stored.
+    uint8_t* raw_address()
+    {
+        return _address.bytes;
+    }
+
+public:
+    // Constructors
+    IPv6Address();
+    IPv6Address(const uint8_t *address);
+    IPv6Address(const uint32_t *address);
+    virtual ~IPv6Address() {}
+
+    bool fromString(const char *address);
+    bool fromString(const String &address) { return fromString(address.c_str()); }
+
+    operator const uint8_t*() const
+    {
+        return _address.bytes;
+    }
+    operator const uint32_t*() const
+    {
+        return _address.dword;
+    }
+    bool operator==(const IPv6Address& addr) const
+    {
+        return (_address.dword[0] == addr._address.dword[0])
+            && (_address.dword[1] == addr._address.dword[1])
+            && (_address.dword[2] == addr._address.dword[2])
+            && (_address.dword[3] == addr._address.dword[3]);
+    }
+    bool operator==(const uint8_t* addr) const;
+
+    // Overloaded index operator to allow getting and setting individual octets of the address
+    uint8_t operator[](int index) const
+    {
+        return _address.bytes[index];
+    }
+    uint8_t& operator[](int index)
+    {
+        return _address.bytes[index];
+    }
+
+    // Overloaded copy operators to allow initialisation of IPv6Address objects from other types
+    IPv6Address& operator=(const uint8_t *address);
+
+    virtual size_t printTo(Print& p) const;
+    String toString() const;
+
+    friend class UDP;
+    friend class Client;
+    friend class Server;
+};
+
+#endif

cores/esp32/MD5Builder.cpp

@@ -0,0 +1,117 @@
+/* 
+  Copyright (c) 2015 Hristo Gochkov. All rights reserved.
+  This file is part of the esp8266 core for Arduino environment.
+ 
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#include <Arduino.h>
+#include <MD5Builder.h>
+
+uint8_t hex_char_to_byte(uint8_t c)
+{
+    return  (c >= 'a' && c <= 'f') ? (c - ((uint8_t)'a' - 0xa)) :
+            (c >= 'A' && c <= 'F') ? (c - ((uint8_t)'A' - 0xA)) :
+            (c >= '0' &&  c<= '9') ? (c - (uint8_t)'0') : 0;
+}
+
+void MD5Builder::begin(void)
+{
+    memset(_buf, 0x00, 16);
+    MD5Init(&_ctx);
+}
+
+void MD5Builder::add(uint8_t * data, uint16_t len)
+{
+    MD5Update(&_ctx, data, len);
+}
+
+void MD5Builder::addHexString(const char * data)
+{
+    uint16_t i, len = strlen(data);
+    uint8_t * tmp = (uint8_t*)malloc(len/2);
+    if(tmp == NULL) {
+        return;
+    }
+    for(i=0; i<len; i+=2) {
+        uint8_t high = hex_char_to_byte(data[i]);
+        uint8_t low = hex_char_to_byte(data[i+1]);
+        tmp[i/2] = (high & 0x0F) << 4 | (low & 0x0F);
+    }
+    add(tmp, len/2);
+    free(tmp);
+}
+
+bool MD5Builder::addStream(Stream & stream, const size_t maxLen)
+{
+    const int buf_size = 512;
+    int maxLengthLeft = maxLen;
+    uint8_t * buf = (uint8_t*) malloc(buf_size);
+
+    if(!buf) {
+        return false;
+    }
+
+    int bytesAvailable = stream.available();
+    while((bytesAvailable > 0) && (maxLengthLeft > 0)) {
+
+        // determine number of bytes to read
+        int readBytes = bytesAvailable;
+        if(readBytes > maxLengthLeft) {
+            readBytes = maxLengthLeft ;    // read only until max_len
+        }
+        if(readBytes > buf_size) {
+            readBytes = buf_size;    // not read more the buffer can handle
+        }
+
+        // read data and check if we got something
+        int numBytesRead = stream.readBytes(buf, readBytes);
+        if(numBytesRead< 1) {
+            return false;
+        }
+
+        // Update MD5 with buffer payload
+        MD5Update(&_ctx, buf, numBytesRead);
+
+        // update available number of bytes
+        maxLengthLeft -= numBytesRead;
+        bytesAvailable = stream.available();
+    }
+    free(buf);
+    return true;
+}
+
+void MD5Builder::calculate(void)
+{
+    MD5Final(_buf, &_ctx);
+}
+
+void MD5Builder::getBytes(uint8_t * output)
+{
+    memcpy(output, _buf, 16);
+}
+
+void MD5Builder::getChars(char * output)
+{
+    for(uint8_t i = 0; i < 16; i++) {
+        sprintf(output + (i * 2), "%02x", _buf[i]);
+    }
+}
+
+String MD5Builder::toString(void)
+{
+    char out[33];
+    getChars(out);
+    return String(out);
+}

cores/esp32/MD5Builder.h

@@ -0,0 +1,75 @@
+/* 
+  Copyright (c) 2015 Hristo Gochkov. All rights reserved.
+  This file is part of the esp8266 core for Arduino environment.
+ 
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#ifndef __ESP8266_MD5_BUILDER__
+#define __ESP8266_MD5_BUILDER__
+
+#include <WString.h>
+#include <Stream.h>
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/md5_hash.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/md5_hash.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/md5_hash.h"
+#endif
+
+class MD5Builder
+{
+private:
+    struct MD5Context _ctx;
+    uint8_t _buf[16];
+public:
+    void begin(void);
+    void add(uint8_t * data, uint16_t len);
+    void add(const char * data)
+    {
+        add((uint8_t*)data, strlen(data));
+    }
+    void add(char * data)
+    {
+        add((const char*)data);
+    }
+    void add(String data)
+    {
+        add(data.c_str());
+    }
+    void addHexString(const char * data);
+    void addHexString(char * data)
+    {
+        addHexString((const char*)data);
+    }
+    void addHexString(String data)
+    {
+        addHexString(data.c_str());
+    }
+    bool addStream(Stream & stream, const size_t maxLen);
+    void calculate(void);
+    void getBytes(uint8_t * output);
+    void getChars(char * output);
+    String toString(void);
+};
+
+
+#endif

cores/esp32/Print.cpp

@@ -0,0 +1,324 @@
+/*
+ Print.cpp - Base class that provides print() and println()
+ Copyright (c) 2008 David A. Mellis.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+ Modified 23 November 2006 by David A. Mellis
+ Modified December 2014 by Ivan Grokhotkov
+ Modified May 2015 by Michael C. Miller - ESP31B progmem support
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include "Arduino.h"
+
+#include "Print.h"
+extern "C" {
+    #include "time.h"
+}
+
+// Public Methods //////////////////////////////////////////////////////////////
+
+/* default implementation: may be overridden */
+size_t Print::write(const uint8_t *buffer, size_t size)
+{
+    size_t n = 0;
+    while(size--) {
+        n += write(*buffer++);
+    }
+    return n;
+}
+
+size_t Print::printf(const char *format, ...)
+{
+    char loc_buf[64];
+    char * temp = loc_buf;
+    va_list arg;
+    va_list copy;
+    va_start(arg, format);
+    va_copy(copy, arg);
+    int len = vsnprintf(temp, sizeof(loc_buf), format, copy);
+    va_end(copy);
+    if(len < 0) {
+        va_end(arg);
+        return 0;
+    };
+    if(len >= sizeof(loc_buf)){
+        temp = (char*) malloc(len+1);
+        if(temp == NULL) {
+            va_end(arg);
+            return 0;
+        }
+        len = vsnprintf(temp, len+1, format, arg);
+    }
+    va_end(arg);
+    len = write((uint8_t*)temp, len);
+    if(temp != loc_buf){
+        free(temp);
+    }
+    return len;
+}
+
+size_t Print::print(const __FlashStringHelper *ifsh)
+{
+    return print(reinterpret_cast<const char *>(ifsh));
+}
+
+size_t Print::print(const String &s)
+{
+    return write(s.c_str(), s.length());
+}
+
+size_t Print::print(const char str[])
+{
+    return write(str);
+}
+
+size_t Print::print(char c)
+{
+    return write(c);
+}
+
+size_t Print::print(unsigned char b, int base)
+{
+    return print((unsigned long) b, base);
+}
+
+size_t Print::print(int n, int base)
+{
+    return print((long) n, base);
+}
+
+size_t Print::print(unsigned int n, int base)
+{
+    return print((unsigned long) n, base);
+}
+
+size_t Print::print(long n, int base)
+{
+    if(base == 0) {
+        return write(n);
+    } else if(base == 10) {
+        if(n < 0) {
+            int t = print('-');
+            n = -n;
+            return printNumber(n, 10) + t;
+        }
+        return printNumber(n, 10);
+    } else {
+        return printNumber(n, base);
+    }
+}
+
+size_t Print::print(unsigned long n, int base)
+{
+    if(base == 0) {
+        return write(n);
+    } else {
+        return printNumber(n, base);
+    }
+}
+
+size_t Print::print(double n, int digits)
+{
+    return printFloat(n, digits);
+}
+
+size_t Print::println(const __FlashStringHelper *ifsh)
+{
+    size_t n = print(ifsh);
+    n += println();
+    return n;
+}
+
+size_t Print::print(const Printable& x)
+{
+    return x.printTo(*this);
+}
+
+size_t Print::print(struct tm * timeinfo, const char * format)
+{
+    const char * f = format;
+    if(!f){
+        f = "%c";
+    }
+    char buf[64];
+    size_t written = strftime(buf, 64, f, timeinfo);
+    if(written == 0){
+        return written;
+    }
+    return print(buf);
+}
+
+size_t Print::println(void)
+{
+    return print("\r\n");
+}
+
+size_t Print::println(const String &s)
+{
+    size_t n = print(s);
+    n += println();
+    return n;
+}
+
+size_t Print::println(const char c[])
+{
+    size_t n = print(c);
+    n += println();
+    return n;
+}
+
+size_t Print::println(char c)
+{
+    size_t n = print(c);
+    n += println();
+    return n;
+}
+
+size_t Print::println(unsigned char b, int base)
+{
+    size_t n = print(b, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(int num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(unsigned int num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(long num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(unsigned long num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(double num, int digits)
+{
+    size_t n = print(num, digits);
+    n += println();
+    return n;
+}
+
+size_t Print::println(const Printable& x)
+{
+    size_t n = print(x);
+    n += println();
+    return n;
+}
+
+size_t Print::println(struct tm * timeinfo, const char * format)
+{
+    size_t n = print(timeinfo, format);
+    n += println();
+    return n;
+}
+
+// Private Methods /////////////////////////////////////////////////////////////
+
+size_t Print::printNumber(unsigned long n, uint8_t base)
+{
+    char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
+    char *str = &buf[sizeof(buf) - 1];
+
+    *str = '\0';
+
+    // prevent crash if called with base == 1
+    if(base < 2) {
+        base = 10;
+    }
+
+    do {
+        unsigned long m = n;
+        n /= base;
+        char c = m - base * n;
+        *--str = c < 10 ? c + '0' : c + 'A' - 10;
+    } while(n);
+
+    return write(str);
+}
+
+size_t Print::printFloat(double number, uint8_t digits)
+{
+    size_t n = 0;
+
+    if(isnan(number)) {
+        return print("nan");
+    }
+    if(isinf(number)) {
+        return print("inf");
+    }
+    if(number > 4294967040.0) {
+        return print("ovf");    // constant determined empirically
+    }
+    if(number < -4294967040.0) {
+        return print("ovf");    // constant determined empirically
+    }
+
+    // Handle negative numbers
+    if(number < 0.0) {
+        n += print('-');
+        number = -number;
+    }
+
+    // Round correctly so that print(1.999, 2) prints as "2.00"
+    double rounding = 0.5;
+    for(uint8_t i = 0; i < digits; ++i) {
+        rounding /= 10.0;
+    }
+
+    number += rounding;
+
+    // Extract the integer part of the number and print it
+    unsigned long int_part = (unsigned long) number;
+    double remainder = number - (double) int_part;
+    n += print(int_part);
+
+    // Print the decimal point, but only if there are digits beyond
+    if(digits > 0) {
+        n += print(".");
+    }
+
+    // Extract digits from the remainder one at a time
+    while(digits-- > 0) {
+        remainder *= 10.0;
+        int toPrint = int(remainder);
+        n += print(toPrint);
+        remainder -= toPrint;
+    }
+
+    return n;
+}

cores/esp32/Print.h

@@ -0,0 +1,103 @@
+/*
+ Print.h - Base class that provides print() and println()
+ Copyright (c) 2008 David A. Mellis.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef Print_h
+#define Print_h
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include "WString.h"
+#include "Printable.h"
+
+#define DEC 10
+#define HEX 16
+#define OCT 8
+#define BIN 2
+
+class Print
+{
+private:
+    int write_error;
+    size_t printNumber(unsigned long, uint8_t);
+    size_t printFloat(double, uint8_t);
+protected:
+    void setWriteError(int err = 1)
+    {
+        write_error = err;
+    }
+public:
+    Print() :
+        write_error(0)
+    {
+    }
+    virtual ~Print() {}
+    int getWriteError()
+    {
+        return write_error;
+    }
+    void clearWriteError()
+    {
+        setWriteError(0);
+    }
+
+    virtual size_t write(uint8_t) = 0;
+    size_t write(const char *str)
+    {
+        if(str == NULL) {
+            return 0;
+        }
+        return write((const uint8_t *) str, strlen(str));
+    }
+    virtual size_t write(const uint8_t *buffer, size_t size);
+    size_t write(const char *buffer, size_t size)
+    {
+        return write((const uint8_t *) buffer, size);
+    }
+
+    size_t printf(const char * format, ...)  __attribute__ ((format (printf, 2, 3)));
+    size_t print(const __FlashStringHelper *);
+    size_t print(const String &);
+    size_t print(const char[]);
+    size_t print(char);
+    size_t print(unsigned char, int = DEC);
+    size_t print(int, int = DEC);
+    size_t print(unsigned int, int = DEC);
+    size_t print(long, int = DEC);
+    size_t print(unsigned long, int = DEC);
+    size_t print(double, int = 2);
+    size_t print(const Printable&);
+    size_t print(struct tm * timeinfo, const char * format = NULL);
+
+    size_t println(const __FlashStringHelper *);
+    size_t println(const String &s);
+    size_t println(const char[]);
+    size_t println(char);
+    size_t println(unsigned char, int = DEC);
+    size_t println(int, int = DEC);
+    size_t println(unsigned int, int = DEC);
+    size_t println(long, int = DEC);
+    size_t println(unsigned long, int = DEC);
+    size_t println(double, int = 2);
+    size_t println(const Printable&);
+    size_t println(struct tm * timeinfo, const char * format = NULL);
+    size_t println(void);
+};
+
+#endif

cores/esp32/Printable.h

@@ -0,0 +1,41 @@
+/*
+ Printable.h - Interface class that allows printing of complex types
+ Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef Printable_h
+#define Printable_h
+
+#include <stdlib.h>
+
+class Print;
+
+/** The Printable class provides a way for new classes to allow themselves to be printed.
+ By deriving from Printable and implementing the printTo method, it will then be possible
+ for users to print out instances of this class by passing them into the usual
+ Print::print and Print::println methods.
+ */
+
+class Printable
+{
+public:
+    virtual ~Printable() {}
+    virtual size_t printTo(Print& p) const = 0;
+};
+
+#endif
+

cores/esp32/Server.h

@@ -0,0 +1,31 @@
+/*
+ Server.h - Base class that provides Server
+ Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef server_h
+#define server_h
+
+#include "Print.h"
+
+class Server: public Print
+{
+public:
+    virtual void begin(uint16_t port=0) =0;
+};
+
+#endif

cores/esp32/Stream.cpp

@@ -0,0 +1,294 @@
+/*
+ Stream.cpp - adds parsing methods to Stream class
+ Copyright (c) 2008 David A. Mellis.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+ Created July 2011
+ parsing functions based on TextFinder library by Michael Margolis
+ */
+
+#include "Arduino.h"
+#include "Stream.h"
+#include "esp32-hal.h"
+
+#define PARSE_TIMEOUT 1000  // default number of milli-seconds to wait
+#define NO_SKIP_CHAR  1  // a magic char not found in a valid ASCII numeric field
+
+// private method to read stream with timeout
+int Stream::timedRead()
+{
+    int c;
+    _startMillis = millis();
+    do {
+        c = read();
+        if(c >= 0) {
+            return c;
+        }
+    } while(millis() - _startMillis < _timeout);
+    return -1;     // -1 indicates timeout
+}
+
+// private method to peek stream with timeout
+int Stream::timedPeek()
+{
+    int c;
+    _startMillis = millis();
+    do {
+        c = peek();
+        if(c >= 0) {
+            return c;
+        }
+    } while(millis() - _startMillis < _timeout);
+    return -1;     // -1 indicates timeout
+}
+
+// returns peek of the next digit in the stream or -1 if timeout
+// discards non-numeric characters
+int Stream::peekNextDigit()
+{
+    int c;
+    while(1) {
+        c = timedPeek();
+        if(c < 0) {
+            return c;    // timeout
+        }
+        if(c == '-') {
+            return c;
+        }
+        if(c >= '0' && c <= '9') {
+            return c;
+        }
+        read();  // discard non-numeric
+    }
+}
+
+// Public Methods
+//////////////////////////////////////////////////////////////
+
+void Stream::setTimeout(unsigned long timeout)  // sets the maximum number of milliseconds to wait
+{
+    _timeout = timeout;
+}
+unsigned long Stream::getTimeout(void) {
+  return _timeout;
+}
+
+// find returns true if the target string is found
+bool Stream::find(const char *target)
+{
+    return findUntil(target, (char*) "");
+}
+
+// reads data from the stream until the target string of given length is found
+// returns true if target string is found, false if timed out
+bool Stream::find(const char *target, size_t length)
+{
+    return findUntil(target, length, NULL, 0);
+}
+
+// as find but search ends if the terminator string is found
+bool Stream::findUntil(const char *target, const char *terminator)
+{
+    return findUntil(target, strlen(target), terminator, strlen(terminator));
+}
+
+// reads data from the stream until the target string of the given length is found
+// search terminated if the terminator string is found
+// returns true if target string is found, false if terminated or timed out
+bool Stream::findUntil(const char *target, size_t targetLen, const char *terminator, size_t termLen)
+{
+    size_t index = 0;  // maximum target string length is 64k bytes!
+    size_t termIndex = 0;
+    int c;
+
+    if(*target == 0) {
+        return true;    // return true if target is a null string
+    }
+    while((c = timedRead()) > 0) {
+
+        if(c != target[index]) {
+            index = 0;    // reset index if any char does not match
+        }
+
+        if(c == target[index]) {
+            //////Serial.print("found "); Serial.write(c); Serial.print("index now"); Serial.println(index+1);
+            if(++index >= targetLen) { // return true if all chars in the target match
+                return true;
+            }
+        }
+
+        if(termLen > 0 && c == terminator[termIndex]) {
+            if(++termIndex >= termLen) {
+                return false;    // return false if terminate string found before target string
+            }
+        } else {
+            termIndex = 0;
+        }
+    }
+    return false;
+}
+
+// returns the first valid (long) integer value from the current position.
+// initial characters that are not digits (or the minus sign) are skipped
+// function is terminated by the first character that is not a digit.
+long Stream::parseInt()
+{
+    return parseInt(NO_SKIP_CHAR); // terminate on first non-digit character (or timeout)
+}
+
+// as above but a given skipChar is ignored
+// this allows format characters (typically commas) in values to be ignored
+long Stream::parseInt(char skipChar)
+{
+    boolean isNegative = false;
+    long value = 0;
+    int c;
+
+    c = peekNextDigit();
+    // ignore non numeric leading characters
+    if(c < 0) {
+        return 0;    // zero returned if timeout
+    }
+
+    do {
+        if(c == skipChar) {
+        } // ignore this charactor
+        else if(c == '-') {
+            isNegative = true;
+        } else if(c >= '0' && c <= '9') {    // is c a digit?
+            value = value * 10 + c - '0';
+        }
+        read();  // consume the character we got with peek
+        c = timedPeek();
+    } while((c >= '0' && c <= '9') || c == skipChar);
+
+    if(isNegative) {
+        value = -value;
+    }
+    return value;
+}
+
+// as parseInt but returns a floating point value
+float Stream::parseFloat()
+{
+    return parseFloat(NO_SKIP_CHAR);
+}
+
+// as above but the given skipChar is ignored
+// this allows format characters (typically commas) in values to be ignored
+float Stream::parseFloat(char skipChar)
+{
+    boolean isNegative = false;
+    boolean isFraction = false;
+    long value = 0;
+    int c;
+    float fraction = 1.0;
+
+    c = peekNextDigit();
+    // ignore non numeric leading characters
+    if(c < 0) {
+        return 0;    // zero returned if timeout
+    }
+
+    do {
+        if(c == skipChar) {
+        } // ignore
+        else if(c == '-') {
+            isNegative = true;
+        } else if(c == '.') {
+            isFraction = true;
+        } else if(c >= '0' && c <= '9') {    // is c a digit?
+            value = value * 10 + c - '0';
+            if(isFraction) {
+                fraction *= 0.1;
+            }
+        }
+        read();  // consume the character we got with peek
+        c = timedPeek();
+    } while((c >= '0' && c <= '9') || c == '.' || c == skipChar);
+
+    if(isNegative) {
+        value = -value;
+    }
+    if(isFraction) {
+        return value * fraction;
+    } else {
+        return value;
+    }
+}
+
+// read characters from stream into buffer
+// terminates if length characters have been read, or timeout (see setTimeout)
+// returns the number of characters placed in the buffer
+// the buffer is NOT null terminated.
+//
+size_t Stream::readBytes(char *buffer, size_t length)
+{
+    size_t count = 0;
+    while(count < length) {
+        int c = timedRead();
+        if(c < 0) {
+            break;
+        }
+        *buffer++ = (char) c;
+        count++;
+    }
+    return count;
+}
+
+// as readBytes with terminator character
+// terminates if length characters have been read, timeout, or if the terminator character  detected
+// returns the number of characters placed in the buffer (0 means no valid data found)
+
+size_t Stream::readBytesUntil(char terminator, char *buffer, size_t length)
+{
+    if(length < 1) {
+        return 0;
+    }
+    size_t index = 0;
+    while(index < length) {
+        int c = timedRead();
+        if(c < 0 || c == terminator) {
+            break;
+        }
+        *buffer++ = (char) c;
+        index++;
+    }
+    return index; // return number of characters, not including null terminator
+}
+
+String Stream::readString()
+{
+    String ret;
+    int c = timedRead();
+    while(c >= 0) {
+        ret += (char) c;
+        c = timedRead();
+    }
+    return ret;
+}
+
+String Stream::readStringUntil(char terminator)
+{
+    String ret;
+    int c = timedRead();
+    while(c >= 0 && c != terminator) {
+        ret += (char) c;
+        c = timedRead();
+    }
+    return ret;
+}
+

cores/esp32/Stream.h

@@ -0,0 +1,128 @@
+/*
+ Stream.h - base class for character-based streams.
+ Copyright (c) 2010 David A. Mellis.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+ parsing functions based on TextFinder library by Michael Margolis
+ */
+
+#ifndef Stream_h
+#define Stream_h
+
+#include <inttypes.h>
+#include "Print.h"
+
+// compatability macros for testing
+/*
+ #define   getInt()            parseInt()
+ #define   getInt(skipChar)    parseInt(skipchar)
+ #define   getFloat()          parseFloat()
+ #define   getFloat(skipChar)  parseFloat(skipChar)
+ #define   getString( pre_string, post_string, buffer, length)
+ readBytesBetween( pre_string, terminator, buffer, length)
+ */
+
+class Stream: public Print
+{
+protected:
+    unsigned long _timeout;      // number of milliseconds to wait for the next char before aborting timed read
+    unsigned long _startMillis;  // used for timeout measurement
+    int timedRead();    // private method to read stream with timeout
+    int timedPeek();    // private method to peek stream with timeout
+    int peekNextDigit(); // returns the next numeric digit in the stream or -1 if timeout
+
+public:
+    virtual int available() = 0;
+    virtual int read() = 0;
+    virtual int peek() = 0;
+    virtual void flush() = 0;
+
+    Stream():_startMillis(0)
+    {
+        _timeout = 1000;
+    }
+    virtual ~Stream() {}
+
+// parsing methods
+
+    void setTimeout(unsigned long timeout);  // sets maximum milliseconds to wait for stream data, default is 1 second
+    unsigned long getTimeout(void);
+    bool find(const char *target);   // reads data from the stream until the target string is found
+    bool find(uint8_t *target)
+    {
+        return find((char *) target);
+    }
+    // returns true if target string is found, false if timed out (see setTimeout)
+
+    bool find(const char *target, size_t length);   // reads data from the stream until the target string of given length is found
+    bool find(const uint8_t *target, size_t length)
+    {
+        return find((char *) target, length);
+    }
+    // returns true if target string is found, false if timed out
+
+    bool find(char target)
+    {
+        return find (&target, 1);
+    }
+
+    bool findUntil(const char *target, const char *terminator);   // as find but search ends if the terminator string is found
+    bool findUntil(const uint8_t *target, const char *terminator)
+    {
+        return findUntil((char *) target, terminator);
+    }
+
+    bool findUntil(const char *target, size_t targetLen, const char *terminate, size_t termLen);   // as above but search ends if the terminate string is found
+    bool findUntil(const uint8_t *target, size_t targetLen, const char *terminate, size_t termLen)
+    {
+        return findUntil((char *) target, targetLen, terminate, termLen);
+    }
+
+    long parseInt(); // returns the first valid (long) integer value from the current position.
+    // initial characters that are not digits (or the minus sign) are skipped
+    // integer is terminated by the first character that is not a digit.
+
+    float parseFloat();               // float version of parseInt
+
+    virtual size_t readBytes(char *buffer, size_t length); // read chars from stream into buffer
+    virtual size_t readBytes(uint8_t *buffer, size_t length)
+    {
+        return readBytes((char *) buffer, length);
+    }
+    // terminates if length characters have been read or timeout (see setTimeout)
+    // returns the number of characters placed in the buffer (0 means no valid data found)
+
+    size_t readBytesUntil(char terminator, char *buffer, size_t length); // as readBytes with terminator character
+    size_t readBytesUntil(char terminator, uint8_t *buffer, size_t length)
+    {
+        return readBytesUntil(terminator, (char *) buffer, length);
+    }
+    // terminates if length characters have been read, timeout, or if the terminator character  detected
+    // returns the number of characters placed in the buffer (0 means no valid data found)
+
+    // Arduino String functions to be added here
+    virtual String readString();
+    String readStringUntil(char terminator);
+
+protected:
+    long parseInt(char skipChar); // as above but the given skipChar is ignored
+    // as above but the given skipChar is ignored
+    // this allows format characters (typically commas) in values to be ignored
+
+    float parseFloat(char skipChar);  // as above but the given skipChar is ignored
+};
+
+#endif

cores/esp32/StreamString.cpp

@@ -0,0 +1,67 @@
+/**
+ StreamString.cpp
+
+ Copyright (c) 2015 Markus Sattler. All rights reserved.
+ This file is part of the esp8266 core for Arduino environment.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+ */
+
+#include <Arduino.h>
+#include "StreamString.h"
+
+size_t StreamString::write(const uint8_t *data, size_t size) {
+    if(size && data) {
+        const unsigned int newlen = length() + size;
+        if(reserve(newlen + 1)) {
+            memcpy((void *) (wbuffer() + len()), (const void *) data, size);
+            setLen(newlen);
+            *(wbuffer() + newlen) = 0x00; // add null for string end
+            return size;
+        }
+    }
+    return 0;
+}
+
+size_t StreamString::write(uint8_t data) {
+    return concat((char) data);
+}
+
+int StreamString::available() {
+    return length();
+}
+
+int StreamString::read() {
+    if(length()) {
+        char c = charAt(0);
+        remove(0, 1);
+        return c;
+
+    }
+    return -1;
+}
+
+int StreamString::peek() {
+    if(length()) {
+        char c = charAt(0);
+        return c;
+    }
+    return -1;
+}
+
+void StreamString::flush() {
+}
+

cores/esp32/StreamString.h

@@ -0,0 +1,39 @@
+/**
+ StreamString.h
+
+ Copyright (c) 2015 Markus Sattler. All rights reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+*/
+
+#ifndef STREAMSTRING_H_
+#define STREAMSTRING_H_
+
+
+class StreamString: public Stream, public String
+{
+public:
+    size_t write(const uint8_t *buffer, size_t size) override;
+    size_t write(uint8_t data) override;
+
+    int available() override;
+    int read() override;
+    int peek() override;
+    void flush() override;
+};
+
+
+#endif /* STREAMSTRING_H_ */

cores/esp32/USB.cpp

@@ -0,0 +1,338 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "esp32-hal.h"
+#include "esp32-hal-tinyusb.h"
+#include "USB.h"
+#if CONFIG_USB_ENABLED
+
+#ifndef USB_VID
+#define USB_VID USB_ESPRESSIF_VID
+#endif
+#ifndef USB_PID
+#define USB_PID 0x0002
+#endif
+#ifndef USB_MANUFACTURER
+#define USB_MANUFACTURER "Espressif Systems"
+#endif
+#ifndef USB_PRODUCT
+#define USB_PRODUCT ARDUINO_BOARD
+#endif
+#ifndef USB_SERIAL
+#define USB_SERIAL "0"
+#endif
+
+extern "C" {
+#include "tinyusb.h"
+}
+
+#if CFG_TUD_DFU_RT
+static uint16_t load_dfu_descriptor(uint8_t * dst, uint8_t * itf)
+{
+#define DFU_ATTR_CAN_DOWNLOAD              1
+#define DFU_ATTR_CAN_UPLOAD                2
+#define DFU_ATTR_MANIFESTATION_TOLERANT    4
+#define DFU_ATTR_WILL_DETACH               8
+#define DFU_ATTRS (DFU_ATTR_CAN_DOWNLOAD | DFU_ATTR_CAN_UPLOAD | DFU_ATTR_MANIFESTATION_TOLERANT)
+
+    uint8_t str_index = tinyusb_add_string_descriptor("TinyUSB DFU_RT");
+    uint8_t descriptor[TUD_DFU_RT_DESC_LEN] = {
+            // Interface number, string index, attributes, detach timeout, transfer size */
+            TUD_DFU_RT_DESCRIPTOR(*itf, str_index, DFU_ATTRS, 700, 64)
+    };
+    *itf+=1;
+    memcpy(dst, descriptor, TUD_DFU_RT_DESC_LEN);
+    return TUD_DFU_RT_DESC_LEN;
+}
+// Invoked on DFU_DETACH request to reboot to the bootloader
+void tud_dfu_rt_reboot_to_dfu(void)
+{
+    usb_persist_restart(RESTART_BOOTLOADER_DFU);
+}
+#endif /* CFG_TUD_DFU_RT */
+
+ESP_EVENT_DEFINE_BASE(ARDUINO_USB_EVENTS);
+
+static esp_event_loop_handle_t arduino_usb_event_loop_handle = NULL;
+
+esp_err_t arduino_usb_event_post(esp_event_base_t event_base, int32_t event_id, void *event_data, size_t event_data_size, TickType_t ticks_to_wait){
+    if(arduino_usb_event_loop_handle == NULL){
+        return ESP_FAIL;
+    }
+    return esp_event_post_to(arduino_usb_event_loop_handle, event_base, event_id, event_data, event_data_size, ticks_to_wait);
+}
+esp_err_t arduino_usb_event_handler_register_with(esp_event_base_t event_base, int32_t event_id, esp_event_handler_t event_handler, void *event_handler_arg){
+    if(arduino_usb_event_loop_handle == NULL){
+        return ESP_FAIL;
+    }
+    return esp_event_handler_register_with(arduino_usb_event_loop_handle, event_base, event_id, event_handler, event_handler_arg);
+}
+
+static bool tinyusb_device_mounted = false;
+static bool tinyusb_device_suspended = false;
+
+// Invoked when device is mounted (configured)
+void tud_mount_cb(void){
+    tinyusb_device_mounted = true;
+    arduino_usb_event_data_t p = {0};
+    arduino_usb_event_post(ARDUINO_USB_EVENTS, ARDUINO_USB_STARTED_EVENT, &p, sizeof(arduino_usb_event_data_t), portMAX_DELAY);
+}
+
+// Invoked when device is unmounted
+void tud_umount_cb(void){
+    tinyusb_device_mounted = false;
+    arduino_usb_event_data_t p = {0};
+    arduino_usb_event_post(ARDUINO_USB_EVENTS, ARDUINO_USB_STOPPED_EVENT, &p, sizeof(arduino_usb_event_data_t), portMAX_DELAY);
+}
+
+// Invoked when usb bus is suspended
+// Within 7ms, device must draw an average of current less than 2.5 mA from bus
+void tud_suspend_cb(bool remote_wakeup_en){
+    tinyusb_device_suspended = true;
+    arduino_usb_event_data_t p = {0};
+    p.suspend.remote_wakeup_en = remote_wakeup_en;
+    arduino_usb_event_post(ARDUINO_USB_EVENTS, ARDUINO_USB_SUSPEND_EVENT, &p, sizeof(arduino_usb_event_data_t), portMAX_DELAY);
+}
+
+// Invoked when usb bus is resumed
+void tud_resume_cb(void){
+    tinyusb_device_suspended = false;
+    arduino_usb_event_data_t p = {0};
+    arduino_usb_event_post(ARDUINO_USB_EVENTS, ARDUINO_USB_RESUME_EVENT, &p, sizeof(arduino_usb_event_data_t), portMAX_DELAY);
+}
+
+ESPUSB::ESPUSB(size_t task_stack_size, uint8_t event_task_priority)
+:vid(USB_VID)
+,pid(USB_PID)
+,product_name(USB_PRODUCT)
+,manufacturer_name(USB_MANUFACTURER)
+,serial_number(USB_SERIAL)
+,fw_version(0x0100)
+,usb_version(0x0200)// at least 2.1 or 3.x for BOS & webUSB
+,usb_class(TUSB_CLASS_MISC)
+,usb_subclass(MISC_SUBCLASS_COMMON)
+,usb_protocol(MISC_PROTOCOL_IAD)
+,usb_attributes(TUSB_DESC_CONFIG_ATT_SELF_POWERED)
+,usb_power_ma(500)
+,webusb_enabled(false)
+,webusb_url("espressif.github.io/arduino-esp32/webusb.html")
+,_started(false)
+,_task_stack_size(task_stack_size)
+,_event_task_priority(event_task_priority)
+{
+    if (!arduino_usb_event_loop_handle) {
+        esp_event_loop_args_t event_task_args = {
+            .queue_size = 5,
+            .task_name = "arduino_usb_events",
+            .task_priority = _event_task_priority,
+            .task_stack_size = _task_stack_size,
+            .task_core_id = tskNO_AFFINITY
+        };
+        if (esp_event_loop_create(&event_task_args, &arduino_usb_event_loop_handle) != ESP_OK) {
+            log_e("esp_event_loop_create failed");
+        }
+    }
+}
+
+ESPUSB::~ESPUSB(){
+    if (arduino_usb_event_loop_handle) {
+        esp_event_loop_delete(arduino_usb_event_loop_handle);
+        arduino_usb_event_loop_handle = NULL;
+    }
+}
+
+bool ESPUSB::begin(){
+    if(!_started){
+        tinyusb_device_config_t tinyusb_device_config = {
+                .vid = vid,
+                .pid = pid,
+                .product_name = product_name.c_str(),
+                .manufacturer_name = manufacturer_name.c_str(),
+                .serial_number = serial_number.c_str(),
+                .fw_version = fw_version,
+                .usb_version = usb_version,
+                .usb_class = usb_class,
+                .usb_subclass = usb_subclass,
+                .usb_protocol = usb_protocol,
+                .usb_attributes = usb_attributes,
+                .usb_power_ma = usb_power_ma,
+                .webusb_enabled = webusb_enabled,
+                .webusb_url = webusb_url.c_str()
+        };
+        _started = tinyusb_init(&tinyusb_device_config) == ESP_OK; 
+    }
+    return _started;
+}
+
+void ESPUSB::onEvent(esp_event_handler_t callback){
+    onEvent(ARDUINO_USB_ANY_EVENT, callback);
+}
+void ESPUSB::onEvent(arduino_usb_event_t event, esp_event_handler_t callback){
+    arduino_usb_event_handler_register_with(ARDUINO_USB_EVENTS, event, callback, this);
+}
+
+ESPUSB::operator bool() const
+{
+    return _started && tinyusb_device_mounted;
+}
+
+bool ESPUSB::enableDFU(){
+#if CFG_TUD_DFU_RT
+    return tinyusb_enable_interface(USB_INTERFACE_DFU, TUD_DFU_RT_DESC_LEN, load_dfu_descriptor) == ESP_OK;
+#endif /* CFG_TUD_DFU_RT */
+    return false;
+}
+
+bool ESPUSB::VID(uint16_t v){
+    if(!_started){
+        vid = v;
+    }
+    return !_started;
+}
+uint16_t ESPUSB::VID(void){
+    return vid;
+}
+
+bool ESPUSB::PID(uint16_t p){
+    if(!_started){
+        pid = p;
+    }
+    return !_started;
+}
+uint16_t ESPUSB::PID(void){
+    return pid;
+}
+
+bool ESPUSB::firmwareVersion(uint16_t version){
+    if(!_started){
+        fw_version = version;
+    }
+    return !_started;
+}
+uint16_t ESPUSB::firmwareVersion(void){
+    return fw_version;
+}
+
+bool ESPUSB::usbVersion(uint16_t version){
+    if(!_started){
+        usb_version = version;
+    }
+    return !_started;
+}
+uint16_t ESPUSB::usbVersion(void){
+    return usb_version;
+}
+
+bool ESPUSB::usbPower(uint16_t mA){
+    if(!_started){
+        usb_power_ma = mA;
+    }
+    return !_started;
+}
+uint16_t ESPUSB::usbPower(void){
+    return usb_power_ma;
+}
+
+bool ESPUSB::usbClass(uint8_t _class){
+    if(!_started){
+        usb_class = _class;
+    }
+    return !_started;
+}
+uint8_t ESPUSB::usbClass(void){
+    return usb_class;
+}
+
+bool ESPUSB::usbSubClass(uint8_t subClass){
+    if(!_started){
+        usb_subclass = subClass;
+    }
+    return !_started;
+}
+uint8_t ESPUSB::usbSubClass(void){
+    return usb_subclass;
+}
+
+bool ESPUSB::usbProtocol(uint8_t protocol){
+    if(!_started){
+        usb_protocol = protocol;
+    }
+    return !_started;
+}
+uint8_t ESPUSB::usbProtocol(void){
+    return usb_protocol;
+}
+
+bool ESPUSB::usbAttributes(uint8_t attr){
+    if(!_started){
+        usb_attributes = attr;
+    }
+    return !_started;
+}
+uint8_t ESPUSB::usbAttributes(void){
+    return usb_attributes;
+}
+
+bool ESPUSB::webUSB(bool enabled){
+    if(!_started){
+        webusb_enabled = enabled;
+    }
+    return !_started;
+}
+bool ESPUSB::webUSB(void){
+    return webusb_enabled;
+}
+
+bool ESPUSB::productName(const char * name){
+    if(!_started){
+        product_name = name;
+    }
+    return !_started;
+}
+const char * ESPUSB::productName(void){
+    return product_name.c_str();
+}
+
+bool ESPUSB::manufacturerName(const char * name){
+    if(!_started){
+        manufacturer_name = name;
+    }
+    return !_started;
+}
+const char * ESPUSB::manufacturerName(void){
+    return manufacturer_name.c_str();
+}
+
+bool ESPUSB::serialNumber(const char * name){
+    if(!_started){
+        serial_number = name;
+    }
+    return !_started;
+}
+const char * ESPUSB::serialNumber(void){
+    return serial_number.c_str();
+}
+
+bool ESPUSB::webUSBURL(const char * name){
+    if(!_started){
+        webusb_url = name;
+    }
+    return !_started;
+}
+const char * ESPUSB::webUSBURL(void){
+    return webusb_url.c_str();
+}
+
+ESPUSB USB;
+
+#endif /* CONFIG_USB_ENABLED */

cores/esp32/USB.h

@@ -0,0 +1,118 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+
+#include "sdkconfig.h"
+#if CONFIG_USB_ENABLED
+
+#include "Arduino.h"
+#include "USBCDC.h"
+
+#include "esp_event.h"
+
+ESP_EVENT_DECLARE_BASE(ARDUINO_USB_EVENTS);
+
+typedef enum {
+    ARDUINO_USB_ANY_EVENT = ESP_EVENT_ANY_ID,
+    ARDUINO_USB_STARTED_EVENT = 0,
+    ARDUINO_USB_STOPPED_EVENT,
+    ARDUINO_USB_SUSPEND_EVENT,
+    ARDUINO_USB_RESUME_EVENT,
+    ARDUINO_USB_MAX_EVENT,
+} arduino_usb_event_t;
+
+typedef union {
+    struct {
+        bool remote_wakeup_en;
+    } suspend;
+} arduino_usb_event_data_t;
+
+class ESPUSB {
+    public:
+        ESPUSB(size_t event_task_stack_size=2048, uint8_t event_task_priority=5);
+        ~ESPUSB();
+        
+        void onEvent(esp_event_handler_t callback);
+        void onEvent(arduino_usb_event_t event, esp_event_handler_t callback);
+        
+        bool VID(uint16_t v);
+        uint16_t VID(void);
+
+        bool PID(uint16_t p);
+        uint16_t PID(void);
+
+        bool firmwareVersion(uint16_t version);
+        uint16_t firmwareVersion(void);
+
+        bool usbVersion(uint16_t version);
+        uint16_t usbVersion(void);
+
+        bool usbPower(uint16_t mA);
+        uint16_t usbPower(void);
+
+        bool usbClass(uint8_t _class);
+        uint8_t usbClass(void);
+
+        bool usbSubClass(uint8_t subClass);
+        uint8_t usbSubClass(void);
+
+        bool usbProtocol(uint8_t protocol);
+        uint8_t usbProtocol(void);
+
+        bool usbAttributes(uint8_t attr);
+        uint8_t usbAttributes(void);
+
+        bool webUSB(bool enabled);
+        bool webUSB(void);
+        
+        bool productName(const char * name);
+        const char * productName(void);
+
+        bool manufacturerName(const char * name);
+        const char * manufacturerName(void);
+
+        bool serialNumber(const char * name);
+        const char * serialNumber(void);
+
+        bool webUSBURL(const char * name);
+        const char * webUSBURL(void);
+
+        bool enableDFU();
+        bool begin();
+        operator bool() const;
+        
+    private:
+        uint16_t vid;
+        uint16_t pid;
+        String product_name;
+        String manufacturer_name;
+        String serial_number;
+        uint16_t fw_version;
+        uint16_t usb_version;
+        uint8_t usb_class;
+        uint8_t usb_subclass;
+        uint8_t usb_protocol;
+        uint8_t usb_attributes;
+        uint16_t usb_power_ma;
+        bool webusb_enabled;
+        String webusb_url;
+        
+        bool _started;
+        size_t _task_stack_size;
+        uint8_t _event_task_priority;
+};
+
+extern ESPUSB USB;
+
+#endif /* CONFIG_USB_ENABLED */

cores/esp32/USBCDC.cpp

@@ -0,0 +1,338 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "esp32-hal.h"
+#include "esp32-hal-tinyusb.h"
+#include "USB.h"
+#include "USBCDC.h"
+#if CONFIG_USB_ENABLED
+
+ESP_EVENT_DEFINE_BASE(ARDUINO_USB_CDC_EVENTS);
+esp_err_t arduino_usb_event_post(esp_event_base_t event_base, int32_t event_id, void *event_data, size_t event_data_size, TickType_t ticks_to_wait);
+esp_err_t arduino_usb_event_handler_register_with(esp_event_base_t event_base, int32_t event_id, esp_event_handler_t event_handler, void *event_handler_arg);
+
+extern "C" {
+#include "tinyusb.h"
+}
+
+#if CFG_TUD_CDC
+#define MAX_USB_CDC_DEVICES 2
+USBCDC * devices[MAX_USB_CDC_DEVICES] = {NULL, NULL};
+
+static uint16_t load_cdc_descriptor(uint8_t * dst, uint8_t * itf)
+{
+    uint8_t str_index = tinyusb_add_string_descriptor("TinyUSB CDC");
+    // Interface number, string index, attributes, detach timeout, transfer size */
+    uint8_t descriptor[TUD_CDC_DESC_LEN] = {
+            // Interface number, string index, EP notification address and size, EP data address (out, in) and size.
+            TUD_CDC_DESCRIPTOR(*itf, str_index, 0x85, 64, 0x03, 0x84, 64)
+    };
+    *itf+=2;
+    memcpy(dst, descriptor, TUD_CDC_DESC_LEN);
+    return TUD_CDC_DESC_LEN;
+}
+
+void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
+{
+    if(itf < MAX_USB_CDC_DEVICES && devices[itf] != NULL){
+        devices[itf]->_onLineState(dtr, rts);
+    }
+}
+
+void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* p_line_coding)
+{
+    if(itf < MAX_USB_CDC_DEVICES && devices[itf] != NULL){
+        devices[itf]->_onLineCoding(p_line_coding->bit_rate, p_line_coding->stop_bits, p_line_coding->parity, p_line_coding->data_bits);
+    }
+}
+
+void tud_cdc_rx_cb(uint8_t itf)
+{
+    if(itf < MAX_USB_CDC_DEVICES && devices[itf] != NULL){
+        devices[itf]->_onRX();
+    }
+}
+
+
+static size_t tinyusb_cdc_write(uint8_t itf, const uint8_t *buffer, size_t size){
+    if(itf >= MAX_USB_CDC_DEVICES){
+        return 0;
+    }
+    if(!tud_cdc_n_connected(itf)){
+        return 0;
+    }
+    size_t tosend = size, sofar = 0;
+    while(tosend){
+        uint32_t space = tud_cdc_n_write_available(itf);
+        if(!space){
+            delay(1);
+            continue;
+        }
+        if(tosend < space){
+            space = tosend;
+        }
+        uint32_t sent = tud_cdc_n_write(itf, buffer + sofar, space);
+        if(!sent){
+            return sofar;
+        }
+        sofar += sent;
+        tosend -= sent;
+        tud_cdc_n_write_flush(itf);
+    }
+    return sofar;
+}
+
+static void ARDUINO_ISR_ATTR cdc0_write_char(char c)
+{
+    tinyusb_cdc_write(0, (const uint8_t *)&c, 1);
+}
+
+//void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char);
+
+static void usb_unplugged_cb(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data){
+    ((USBCDC*)arg)->_onUnplugged();
+}
+
+USBCDC::USBCDC(uint8_t itfn) : itf(itfn), bit_rate(0), stop_bits(0), parity(0), data_bits(0), dtr(false),  rts(false), connected(false), reboot_enable(true), rx_queue(NULL) {
+    tinyusb_enable_interface(USB_INTERFACE_CDC, TUD_CDC_DESC_LEN, load_cdc_descriptor);
+    if(itf < MAX_USB_CDC_DEVICES){
+        devices[itf] = this;
+        arduino_usb_event_handler_register_with(ARDUINO_USB_EVENTS, ARDUINO_USB_STOPPED_EVENT, usb_unplugged_cb, this);
+    }
+}
+
+void USBCDC::onEvent(esp_event_handler_t callback){
+    onEvent(ARDUINO_USB_CDC_ANY_EVENT, callback);
+}
+void USBCDC::onEvent(arduino_usb_cdc_event_t event, esp_event_handler_t callback){
+    arduino_usb_event_handler_register_with(ARDUINO_USB_CDC_EVENTS, event, callback, this);
+}
+
+size_t USBCDC::setRxBufferSize(size_t rx_queue_len){
+    if(rx_queue){
+        return 0;
+    }
+    rx_queue = xQueueCreate(rx_queue_len, sizeof(uint8_t));
+    if(!rx_queue){
+        return 0;
+    }
+    return rx_queue_len;
+}
+
+void USBCDC::begin(unsigned long baud)
+{
+    setRxBufferSize(256);//default if not preset
+}
+
+void USBCDC::end()
+{
+}
+
+void USBCDC::_onUnplugged(void){
+    if(connected){
+        connected = false;
+        dtr = false;
+        rts = false;
+        arduino_usb_cdc_event_data_t p = {0};
+        arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_DISCONNECTED_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
+    }
+}
+
+enum { CDC_LINE_IDLE, CDC_LINE_1, CDC_LINE_2, CDC_LINE_3 };
+void USBCDC::_onLineState(bool _dtr, bool _rts){
+    static uint8_t lineState = CDC_LINE_IDLE;
+    dtr = _dtr;
+    rts = _rts;
+
+    if(reboot_enable){
+        if(!dtr && rts){
+            if(lineState == CDC_LINE_IDLE){
+                lineState++;
+            } else {
+                lineState = CDC_LINE_IDLE;
+            }
+        } else if(dtr && rts){
+            if(lineState == CDC_LINE_1){
+                lineState++;
+            } else {
+                lineState = CDC_LINE_IDLE;
+            }
+        } else if(dtr && !rts){
+            if(lineState == CDC_LINE_2){
+                lineState++;
+            } else {
+                lineState = CDC_LINE_IDLE;
+            }
+        } else if(!dtr && !rts){
+            if(lineState == CDC_LINE_3){
+                usb_persist_restart(RESTART_BOOTLOADER);
+            } else {
+                lineState = CDC_LINE_IDLE;
+            }
+        }
+    }
+    
+    if(lineState == CDC_LINE_IDLE){
+        if(dtr && rts && !connected){
+            connected = true;
+            arduino_usb_cdc_event_data_t p = {0};
+            arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_CONNECTED_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
+        } else if(!dtr && !rts && connected){
+            connected = false;
+            arduino_usb_cdc_event_data_t p = {0};
+            arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_DISCONNECTED_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
+        }
+        arduino_usb_cdc_event_data_t l = {0};
+        l.line_state.dtr = dtr;
+        l.line_state.rts = rts;
+        arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_LINE_STATE_EVENT, &l, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
+    }
+
+}
+
+void USBCDC::_onLineCoding(uint32_t _bit_rate, uint8_t _stop_bits, uint8_t _parity, uint8_t _data_bits){
+    if(bit_rate != _bit_rate || data_bits != _data_bits || stop_bits != _stop_bits || parity != _parity){
+        bit_rate = _bit_rate;
+        data_bits = _data_bits;
+        stop_bits = _stop_bits;
+        parity = _parity;
+        arduino_usb_cdc_event_data_t p = {0};
+        p.line_coding.bit_rate = bit_rate;
+        p.line_coding.data_bits = data_bits;
+        p.line_coding.stop_bits = stop_bits;
+        p.line_coding.parity = parity;
+        arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_LINE_CODING_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
+    }
+}
+
+void USBCDC::_onRX(){
+    uint8_t buf[CONFIG_USB_CDC_RX_BUFSIZE+1];
+    uint32_t count = tud_cdc_n_read(itf, buf, CONFIG_USB_CDC_RX_BUFSIZE);
+    for(uint32_t i=0; i<count; i++){
+        if(rx_queue == NULL || !xQueueSend(rx_queue, buf+i, 0)){
+            return;
+        }
+    }
+    arduino_usb_cdc_event_data_t p = {0};
+    p.rx.len = count;
+    arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_RX_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
+}
+
+void  USBCDC::enableReboot(bool enable){
+    reboot_enable = enable;
+}
+bool  USBCDC::rebootEnabled(void){
+    return reboot_enable;
+}
+
+int USBCDC::available(void)
+{
+    if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
+        return -1;
+    }
+    return uxQueueMessagesWaiting(rx_queue);
+}
+
+int USBCDC::peek(void)
+{
+    if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
+        return -1;
+    }
+    uint8_t c;
+    if(xQueuePeek(rx_queue, &c, 0)) {
+        return c;
+    }
+    return -1;
+}
+
+int USBCDC::read(void)
+{
+    if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
+        return -1;
+    }
+    uint8_t c = 0;
+    if(xQueueReceive(rx_queue, &c, 0)) {
+        return c;
+    }
+    return -1;
+}
+
+size_t USBCDC::read(uint8_t *buffer, size_t size)
+{
+    if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
+        return -1;
+    }
+    uint8_t c = 0;
+    size_t count = 0;
+    while(count < size && xQueueReceive(rx_queue, &c, 0)){
+        buffer[count++] = c;
+    }
+    return count;
+}
+
+void USBCDC::flush(void)
+{
+    if(itf >= MAX_USB_CDC_DEVICES){
+        return;
+    }
+    tud_cdc_n_write_flush(itf);
+}
+
+int USBCDC::availableForWrite(void)
+{
+    if(itf >= MAX_USB_CDC_DEVICES){
+        return -1;
+    }
+    return tud_cdc_n_write_available(itf);
+}
+
+size_t USBCDC::write(const uint8_t *buffer, size_t size)
+{
+    return tinyusb_cdc_write(itf, buffer, size);
+}
+
+size_t USBCDC::write(uint8_t c)
+{
+    return write(&c, 1);
+}
+
+uint32_t  USBCDC::baudRate()
+{
+    return bit_rate;
+}
+
+void USBCDC::setDebugOutput(bool en)
+{
+    if(en) {
+        uartSetDebug(NULL);
+        ets_install_putc1((void (*)(char)) &cdc0_write_char);
+    } else {
+        ets_install_putc1(NULL);
+    }
+}
+
+USBCDC::operator bool() const
+{
+    if(itf >= MAX_USB_CDC_DEVICES){
+        return false;
+    }
+    return connected;
+}
+
+#if ARDUINO_SERIAL_PORT //Serial used for USB CDC
+USBCDC Serial(0);
+#endif
+
+#endif /* CONFIG_USB_CDC_ENABLED */
+
+#endif /* CONFIG_USB_ENABLED */

cores/esp32/USBCDC.h

@@ -0,0 +1,133 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+
+#include <inttypes.h>
+
+#include "Stream.h"
+#include "esp32-hal.h"
+#if CONFIG_USB_CDC_ENABLED
+
+#include "esp_event.h"
+
+ESP_EVENT_DECLARE_BASE(ARDUINO_USB_CDC_EVENTS);
+
+typedef enum {
+    ARDUINO_USB_CDC_ANY_EVENT = ESP_EVENT_ANY_ID,
+    ARDUINO_USB_CDC_CONNECTED_EVENT = 0,
+    ARDUINO_USB_CDC_DISCONNECTED_EVENT,
+    ARDUINO_USB_CDC_LINE_STATE_EVENT,
+    ARDUINO_USB_CDC_LINE_CODING_EVENT,
+    ARDUINO_USB_CDC_RX_EVENT,
+    ARDUINO_USB_CDC_MAX_EVENT,
+} arduino_usb_cdc_event_t;
+
+typedef union {
+    struct {
+            bool dtr;
+            bool rts;
+    } line_state;
+    struct {
+            uint32_t bit_rate;
+            uint8_t  stop_bits; ///< 0: 1 stop bit - 1: 1.5 stop bits - 2: 2 stop bits
+            uint8_t  parity;    ///< 0: None - 1: Odd - 2: Even - 3: Mark - 4: Space
+            uint8_t  data_bits; ///< can be 5, 6, 7, 8 or 16
+    } line_coding;
+    struct {
+            size_t len;
+    } rx;
+} arduino_usb_cdc_event_data_t;
+
+class USBCDC: public Stream
+{
+public:
+    USBCDC(uint8_t itf=0);
+
+    void onEvent(esp_event_handler_t callback);
+    void onEvent(arduino_usb_cdc_event_t event, esp_event_handler_t callback);
+
+    size_t setRxBufferSize(size_t);
+    void begin(unsigned long baud=0);
+    void end();
+    
+    int available(void);
+    int availableForWrite(void);
+    int peek(void);
+    int read(void);
+    size_t read(uint8_t *buffer, size_t size);
+    size_t write(uint8_t);
+    size_t write(const uint8_t *buffer, size_t size);
+    void flush(void);
+    
+    inline size_t read(char * buffer, size_t size)
+    {
+        return read((uint8_t*) buffer, size);
+    }
+    inline size_t write(const char * buffer, size_t size)
+    {
+        return write((uint8_t*) buffer, size);
+    }
+    inline size_t write(const char * s)
+    {
+        return write((uint8_t*) s, strlen(s));
+    }
+    inline size_t write(unsigned long n)
+    {
+        return write((uint8_t) n);
+    }
+    inline size_t write(long n)
+    {
+        return write((uint8_t) n);
+    }
+    inline size_t write(unsigned int n)
+    {
+        return write((uint8_t) n);
+    }
+    inline size_t write(int n)
+    {
+        return write((uint8_t) n);
+    }
+    uint32_t baudRate();
+    void setDebugOutput(bool);
+    operator bool() const;
+
+    void enableReboot(bool enable);
+    bool rebootEnabled(void);
+
+    //internal methods
+    void _onDFU(void);
+    void _onLineState(bool _dtr, bool _rts);
+    void _onLineCoding(uint32_t _bit_rate, uint8_t _stop_bits, uint8_t _parity, uint8_t _data_bits);
+    void _onRX(void);
+    void _onUnplugged(void);
+    
+protected:
+    uint8_t  itf;
+    uint32_t bit_rate;
+    uint8_t  stop_bits; ///< 0: 1 stop bit - 1: 1.5 stop bits - 2: 2 stop bits
+    uint8_t  parity;    ///< 0: None - 1: Odd - 2: Even - 3: Mark - 4: Space
+    uint8_t  data_bits; ///< can be 5, 6, 7, 8 or 16
+    bool     dtr;
+    bool     rts;
+    bool     connected;
+    bool     reboot_enable;
+    xQueueHandle rx_queue;
+    
+};
+
+#if ARDUINO_SERIAL_PORT //Serial used for USB CDC
+extern USBCDC Serial;
+#endif
+
+#endif /* CONFIG_USB_CDC_ENABLED */

cores/esp32/Udp.h

@@ -0,0 +1,92 @@
+/*
+ *  Udp.cpp: Library to send/receive UDP packets.
+ *
+ * NOTE: UDP is fast, but has some important limitations (thanks to Warren Gray for mentioning these)
+ * 1) UDP does not guarantee the order in which assembled UDP packets are received. This
+ * might not happen often in practice, but in larger network topologies, a UDP
+ * packet can be received out of sequence.
+ * 2) UDP does not guard against lost packets - so packets *can* disappear without the sender being
+ * aware of it. Again, this may not be a concern in practice on small local networks.
+ * For more information, see http://www.cafeaulait.org/course/week12/35.html
+ *
+ * MIT License:
+ * Copyright (c) 2008 Bjoern Hartmann
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * bjoern@cs.stanford.edu 12/30/2008
+ */
+
+#ifndef udp_h
+#define udp_h
+
+#include <Stream.h>
+#include <IPAddress.h>
+
+class UDP: public Stream
+{
+
+public:
+    virtual uint8_t begin(uint16_t) =0;	// initialize, start listening on specified port. Returns 1 if successful, 0 if there are no sockets available to use
+    virtual void stop() =0;  // Finish with the UDP socket
+
+    // Sending UDP packets
+
+    // Start building up a packet to send to the remote host specific in ip and port
+    // Returns 1 if successful, 0 if there was a problem with the supplied IP address or port
+    virtual int beginPacket(IPAddress ip, uint16_t port) =0;
+    // Start building up a packet to send to the remote host specific in host and port
+    // Returns 1 if successful, 0 if there was a problem resolving the hostname or port
+    virtual int beginPacket(const char *host, uint16_t port) =0;
+    // Finish off this packet and send it
+    // Returns 1 if the packet was sent successfully, 0 if there was an error
+    virtual int endPacket() =0;
+    // Write a single byte into the packet
+    virtual size_t write(uint8_t) =0;
+    // Write size bytes from buffer into the packet
+    virtual size_t write(const uint8_t *buffer, size_t size) =0;
+
+    // Start processing the next available incoming packet
+    // Returns the size of the packet in bytes, or 0 if no packets are available
+    virtual int parsePacket() =0;
+    // Number of bytes remaining in the current packet
+    virtual int available() =0;
+    // Read a single byte from the current packet
+    virtual int read() =0;
+    // Read up to len bytes from the current packet and place them into buffer
+    // Returns the number of bytes read, or 0 if none are available
+    virtual int read(unsigned char* buffer, size_t len) =0;
+    // Read up to len characters from the current packet and place them into buffer
+    // Returns the number of characters read, or 0 if none are available
+    virtual int read(char* buffer, size_t len) =0;
+    // Return the next byte from the current packet without moving on to the next byte
+    virtual int peek() =0;
+    virtual void flush() =0;	// Finish reading the current packet
+
+    // Return the IP address of the host who sent the current incoming packet
+    virtual IPAddress remoteIP() =0;
+    // Return the port of the host who sent the current incoming packet
+    virtual uint16_t remotePort() =0;
+protected:
+    uint8_t* rawIPAddress(IPAddress& addr)
+    {
+        return addr.raw_address();
+    }
+};
+
+#endif

cores/esp32/WCharacter.h

@@ -0,0 +1,154 @@
+/*
+ WCharacter.h - Character utility functions for Wiring & Arduino
+ Copyright (c) 2010 Hernando Barragan.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef Character_h
+#define Character_h
+
+#include <ctype.h>
+#define isascii(__c) ((unsigned)(__c)<=0177)
+#define toascii(__c)  ((__c)&0177)
+
+// WCharacter.h prototypes
+inline boolean isAlphaNumeric(int c) __attribute__((always_inline));
+inline boolean isAlpha(int c) __attribute__((always_inline));
+inline boolean isAscii(int c) __attribute__((always_inline));
+inline boolean isWhitespace(int c) __attribute__((always_inline));
+inline boolean isControl(int c) __attribute__((always_inline));
+inline boolean isDigit(int c) __attribute__((always_inline));
+inline boolean isGraph(int c) __attribute__((always_inline));
+inline boolean isLowerCase(int c) __attribute__((always_inline));
+inline boolean isPrintable(int c) __attribute__((always_inline));
+inline boolean isPunct(int c) __attribute__((always_inline));
+inline boolean isSpace(int c) __attribute__((always_inline));
+inline boolean isUpperCase(int c) __attribute__((always_inline));
+inline boolean isHexadecimalDigit(int c) __attribute__((always_inline));
+inline int toAscii(int c) __attribute__((always_inline));
+inline int toLowerCase(int c) __attribute__((always_inline));
+inline int toUpperCase(int c) __attribute__((always_inline));
+
+// Checks for an alphanumeric character.
+// It is equivalent to (isalpha(c) || isdigit(c)).
+inline boolean isAlphaNumeric(int c)
+{
+    return (isalnum(c) == 0 ? false : true);
+}
+
+// Checks for an alphabetic character.
+// It is equivalent to (isupper(c) || islower(c)).
+inline boolean isAlpha(int c)
+{
+    return (isalpha(c) == 0 ? false : true);
+}
+
+// Checks whether c is a 7-bit unsigned char value
+// that fits into the ASCII character set.
+inline boolean isAscii(int c)
+{
+    return ( isascii (c) == 0 ? false : true);
+}
+
+// Checks for a blank character, that is, a space or a tab.
+inline boolean isWhitespace(int c)
+{
+    return (isblank(c) == 0 ? false : true);
+}
+
+// Checks for a control character.
+inline boolean isControl(int c)
+{
+    return (iscntrl(c) == 0 ? false : true);
+}
+
+// Checks for a digit (0 through 9).
+inline boolean isDigit(int c)
+{
+    return (isdigit(c) == 0 ? false : true);
+}
+
+// Checks for any printable character except space.
+inline boolean isGraph(int c)
+{
+    return (isgraph(c) == 0 ? false : true);
+}
+
+// Checks for a lower-case character.
+inline boolean isLowerCase(int c)
+{
+    return (islower(c) == 0 ? false : true);
+}
+
+// Checks for any printable character including space.
+inline boolean isPrintable(int c)
+{
+    return (isprint(c) == 0 ? false : true);
+}
+
+// Checks for any printable character which is not a space
+// or an alphanumeric character.
+inline boolean isPunct(int c)
+{
+    return (ispunct(c) == 0 ? false : true);
+}
+
+// Checks for white-space characters. For the avr-libc library,
+// these are: space, formfeed ('\f'), newline ('\n'), carriage
+// return ('\r'), horizontal tab ('\t'), and vertical tab ('\v').
+inline boolean isSpace(int c)
+{
+    return (isspace(c) == 0 ? false : true);
+}
+
+// Checks for an uppercase letter.
+inline boolean isUpperCase(int c)
+{
+    return (isupper(c) == 0 ? false : true);
+}
+
+// Checks for a hexadecimal digits, i.e. one of 0 1 2 3 4 5 6 7
+// 8 9 a b c d e f A B C D E F.
+inline boolean isHexadecimalDigit(int c)
+{
+    return (isxdigit(c) == 0 ? false : true);
+}
+
+// Converts c to a 7-bit unsigned char value that fits into the
+// ASCII character set, by clearing the high-order bits.
+inline int toAscii(int c)
+{
+    return toascii(c);
+}
+
+// Warning:
+// Many people will be unhappy if you use this function.
+// This function will convert accented letters into random
+// characters.
+
+// Converts the letter c to lower case, if possible.
+inline int toLowerCase(int c)
+{
+    return tolower(c);
+}
+
+// Converts the letter c to upper case, if possible.
+inline int toUpperCase(int c)
+{
+    return toupper(c);
+}
+
+#endif

cores/esp32/WMath.cpp

@@ -0,0 +1,84 @@
+/* -*- mode: jde; c-basic-offset: 2; indent-tabs-mode: nil -*- */
+
+/*
+ Part of the Wiring project - http://wiring.org.co
+ Copyright (c) 2004-06 Hernando Barragan
+ Modified 13 August 2006, David A. Mellis for Arduino - http://www.arduino.cc/
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General
+ Public License along with this library; if not, write to the
+ Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ Boston, MA  02111-1307  USA
+
+ $Id$
+ */
+
+extern "C" {
+#include <stdlib.h>
+#include "esp_system.h"
+}
+
+void randomSeed(unsigned long seed)
+{
+    if(seed != 0) {
+        srand(seed);
+    }
+}
+
+long random(long howbig)
+{
+    uint32_t x = esp_random();
+    uint64_t m = uint64_t(x) * uint64_t(howbig);
+    uint32_t l = uint32_t(m);
+    if (l < howbig) {
+        uint32_t t = -howbig;
+        if (t >= howbig) {
+            t -= howbig;
+            if (t >= howbig) 
+                t %= howbig;
+        }
+        while (l < t) {
+            x = esp_random();
+            m = uint64_t(x) * uint64_t(howbig);
+            l = uint32_t(m);
+        }
+    }
+    return m >> 32;
+}
+
+long random(long howsmall, long howbig)
+{
+    if(howsmall >= howbig) {
+        return howsmall;
+    }
+    long diff = howbig - howsmall;
+    return random(diff) + howsmall;
+}
+
+long map(long x, long in_min, long in_max, long out_min, long out_max) {
+    long divisor = (in_max - in_min);
+    if(divisor == 0){
+        return -1; //AVR returns -1, SAM returns 0
+    }
+    return (x - in_min) * (out_max - out_min) / divisor + out_min;
+}
+
+unsigned int makeWord(unsigned int w)
+{
+    return w;
+}
+
+unsigned int makeWord(unsigned char h, unsigned char l)
+{
+    return (h << 8) | l;
+}

cores/esp32/WString.cpp

@@ -0,0 +1,861 @@
+/*
+ WString.cpp - String library for Wiring & Arduino
+ ...mostly rewritten by Paul Stoffregen...
+ Copyright (c) 2009-10 Hernando Barragan.  All rights reserved.
+ Copyright 2011, Paul Stoffregen, paul@pjrc.com
+ Modified by Ivan Grokhotkov, 2014 - esp8266 support
+ Modified by Michael C. Miller, 2015 - esp8266 progmem support
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <Arduino.h>
+#include "WString.h"
+#include "stdlib_noniso.h"
+
+/*********************************************/
+/*  Constructors                             */
+/*********************************************/
+
+String::String(const char *cstr) {
+    init();
+    if (cstr)
+        copy(cstr, strlen(cstr));
+}
+
+String::String(const String &value) {
+    init();
+    *this = value;
+}
+
+String::String(const __FlashStringHelper *pstr) {
+    init();
+    *this = pstr; // see operator =
+}
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+String::String(String &&rval) {
+    init();
+    move(rval);
+}
+
+String::String(StringSumHelper &&rval) {
+    init();
+    move(rval);
+}
+#endif
+
+String::String(char c) {
+    init();
+    char buf[2];
+    buf[0] = c;
+    buf[1] = 0;
+    *this = buf;
+}
+
+String::String(unsigned char value, unsigned char base) {
+    init();
+    char buf[1 + 8 * sizeof(unsigned char)];
+    utoa(value, buf, base);
+    *this = buf;
+}
+
+String::String(int value, unsigned char base) {
+    init();
+    char buf[2 + 8 * sizeof(int)];
+    if (base == 10) {
+        sprintf(buf, "%d", value);
+    } else {
+        itoa(value, buf, base);
+    }
+    *this = buf;
+}
+
+String::String(unsigned int value, unsigned char base) {
+    init();
+    char buf[1 + 8 * sizeof(unsigned int)];
+    utoa(value, buf, base);
+    *this = buf;
+}
+
+String::String(long value, unsigned char base) {
+    init();
+    char buf[2 + 8 * sizeof(long)];
+    if (base==10) {
+        sprintf(buf, "%ld", value);
+    } else {
+        ltoa(value, buf, base);
+    }
+    *this = buf;
+}
+
+String::String(unsigned long value, unsigned char base) {
+    init();
+    char buf[1 + 8 * sizeof(unsigned long)];
+    ultoa(value, buf, base);
+    *this = buf;
+}
+
+String::String(float value, unsigned char decimalPlaces) {
+    init();
+    char buf[33];
+    *this = dtostrf(value, (decimalPlaces + 2), decimalPlaces, buf);
+}
+
+String::String(double value, unsigned char decimalPlaces) {
+    init();
+    char buf[33];
+    *this = dtostrf(value, (decimalPlaces + 2), decimalPlaces, buf);
+}
+
+String::~String() {
+    invalidate();
+}
+
+// /*********************************************/
+// /*  Memory Management                        */
+// /*********************************************/
+
+inline void String::init(void) {
+    setSSO(false);
+    setCapacity(0);
+    setLen(0);
+    setBuffer(nullptr);
+}
+
+void String::invalidate(void) {
+    if(!isSSO() && wbuffer())
+        free(wbuffer());
+    init();
+}
+
+unsigned char String::reserve(unsigned int size) {
+    if(buffer() && capacity() >= size)
+        return 1;
+    if(changeBuffer(size)) {
+        if(len() == 0)
+            wbuffer()[0] = 0;
+        return 1;
+    }
+    return 0;
+}
+
+unsigned char String::changeBuffer(unsigned int maxStrLen) {
+    // Can we use SSO here to avoid allocation?
+    if (maxStrLen < sizeof(sso.buff) - 1) {
+        if (isSSO() || !buffer()) {
+            // Already using SSO, nothing to do
+	    uint16_t oldLen = len();
+            setSSO(true);
+	    setLen(oldLen);
+            return 1;
+        } else { // if bufptr && !isSSO()
+            // Using bufptr, need to shrink into sso.buff
+            char temp[sizeof(sso.buff)];
+            memcpy(temp, buffer(), maxStrLen);
+            free(wbuffer());
+            uint16_t oldLen = len();
+            setSSO(true);
+	    setLen(oldLen);
+            memcpy(wbuffer(), temp, maxStrLen);
+            return 1;
+        }
+    }
+    // Fallthrough to normal allocator
+    size_t newSize = (maxStrLen + 16) & (~0xf);
+    // Make sure we can fit newsize in the buffer
+    if (newSize > CAPACITY_MAX) {
+        return false;
+    }
+    uint16_t oldLen = len();
+    char *newbuffer = (char *) realloc(isSSO() ? nullptr : wbuffer(), newSize);
+    if (newbuffer) {
+        size_t oldSize = capacity() + 1; // include NULL.
+        if (isSSO()) {
+            // Copy the SSO buffer into allocated space
+            memmove(newbuffer, sso.buff, sizeof(sso.buff));
+        }
+        if (newSize > oldSize)
+        {
+            memset(newbuffer + oldSize, 0, newSize - oldSize);
+        }
+        setSSO(false);
+        setCapacity(newSize - 1);
+        setLen(oldLen); // Needed in case of SSO where len() never existed
+        setBuffer(newbuffer);
+        return 1;
+    }
+    return 0;
+}
+
+// /*********************************************/
+// /*  Copy and Move                            */
+// /*********************************************/
+
+String & String::copy(const char *cstr, unsigned int length) {
+    if(!reserve(length)) {
+        invalidate();
+        return *this;
+    }
+    setLen(length);
+    memmove(wbuffer(), cstr, length + 1);
+    return *this;
+}
+
+String & String::copy(const __FlashStringHelper *pstr, unsigned int length) {
+    if (!reserve(length)) {
+        invalidate();
+        return *this;
+    }
+    setLen(length);
+    memcpy_P(wbuffer(), (PGM_P)pstr, length + 1); // We know wbuffer() cannot ever be in PROGMEM, so memcpy safe here
+    return *this;
+}
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+void String::move(String &rhs) {
+    if(buffer()) {
+        if(capacity() >= rhs.len()) {
+            memmove(wbuffer(), rhs.buffer(), rhs.length() + 1);
+            setLen(rhs.len());
+	    rhs.invalidate();
+            return;
+        } else {
+            if (!isSSO()) {
+                free(wbuffer());
+                setBuffer(nullptr);
+            }
+        }
+    }
+    if (rhs.isSSO()) {
+        setSSO(true);
+        memmove(sso.buff, rhs.sso.buff, sizeof(sso.buff));
+    } else {
+        setSSO(false);
+        setBuffer(rhs.wbuffer());
+    }
+    setCapacity(rhs.capacity());
+    setLen(rhs.len());
+    rhs.setSSO(false);
+    rhs.setCapacity(0);
+    rhs.setLen(0);
+    rhs.setBuffer(nullptr);
+}
+#endif
+
+String & String::operator =(const String &rhs) {
+    if(this == &rhs)
+        return *this;
+
+    if(rhs.buffer())
+        copy(rhs.buffer(), rhs.len());
+    else
+        invalidate();
+
+    return *this;
+}
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+String & String::operator =(String &&rval) {
+    if(this != &rval)
+        move(rval);
+    return *this;
+}
+
+String & String::operator =(StringSumHelper &&rval) {
+    if(this != &rval)
+        move(rval);
+    return *this;
+}
+#endif
+
+String & String::operator =(const char *cstr) {
+    if(cstr)
+        copy(cstr, strlen(cstr));
+    else
+        invalidate();
+
+    return *this;
+}
+
+String & String::operator = (const __FlashStringHelper *pstr)
+{
+    if (pstr) copy(pstr, strlen_P((PGM_P)pstr));
+    else invalidate();
+
+    return *this;
+}
+
+// /*********************************************/
+// /*  concat                                   */
+// /*********************************************/
+
+unsigned char String::concat(const String &s) {
+    // Special case if we're concatting ourself (s += s;) since we may end up
+    // realloc'ing the buffer and moving s.buffer in the method called
+    if (&s == this) {
+        unsigned int newlen = 2 * len();
+        if (!s.buffer())
+            return 0;
+        if (s.len() == 0)
+            return 1;
+        if (!reserve(newlen))
+            return 0;
+        memmove(wbuffer() + len(), buffer(), len());
+        setLen(newlen);
+        wbuffer()[len()] = 0;
+        return 1;
+    } else {
+        return concat(s.buffer(), s.len());
+    }
+}
+
+unsigned char String::concat(const char *cstr, unsigned int length) {
+    unsigned int newlen = len() + length;
+    if(!cstr)
+        return 0;
+    if(length == 0)
+        return 1;
+    if(!reserve(newlen))
+        return 0;
+    if (cstr >= wbuffer() && cstr < wbuffer() + len())
+        // compatible with SSO in ram #6155 (case "x += x.c_str()")
+        memmove(wbuffer() + len(), cstr, length + 1);
+    else
+        // compatible with source in flash #6367
+        memcpy_P(wbuffer() + len(), cstr, length + 1);
+    setLen(newlen);
+    return 1;
+}
+
+unsigned char String::concat(const char *cstr) {
+    if(!cstr)
+        return 0;
+    return concat(cstr, strlen(cstr));
+}
+
+unsigned char String::concat(char c) {
+    char buf[2];
+    buf[0] = c;
+    buf[1] = 0;
+    return concat(buf, 1);
+}
+
+unsigned char String::concat(unsigned char num) {
+    char buf[1 + 3 * sizeof(unsigned char)];
+    sprintf(buf, "%d", num);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(int num) {
+    char buf[2 + 3 * sizeof(int)];
+    sprintf(buf, "%d", num);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(unsigned int num) {
+    char buf[1 + 3 * sizeof(unsigned int)];
+    utoa(num, buf, 10);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(long num) {
+    char buf[2 + 3 * sizeof(long)];
+    sprintf(buf, "%ld", num);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(unsigned long num) {
+    char buf[1 + 3 * sizeof(unsigned long)];
+    ultoa(num, buf, 10);
+    return concat(buf, strlen(buf));
+}
+
+unsigned char String::concat(float num) {
+    char buf[20];
+    char* string = dtostrf(num, 4, 2, buf);
+    return concat(string, strlen(string));
+}
+
+unsigned char String::concat(double num) {
+    char buf[20];
+    char* string = dtostrf(num, 4, 2, buf);
+    return concat(string, strlen(string));
+}
+
+unsigned char String::concat(const __FlashStringHelper * str) {
+    if (!str) return 0;
+    int length = strlen_P((PGM_P)str);
+    if (length == 0) return 1;
+    unsigned int newlen = len() + length;
+    if (!reserve(newlen)) return 0;
+    memcpy_P(wbuffer() + len(), (PGM_P)str, length + 1);
+    setLen(newlen);
+    return 1;
+}
+
+/*********************************************/
+/*  Concatenate                              */
+/*********************************************/
+
+StringSumHelper & operator +(const StringSumHelper &lhs, const String &rhs) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(rhs.buffer(), rhs.len()))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, const char *cstr) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!cstr || !a.concat(cstr, strlen(cstr)))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, char c) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(c))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, unsigned char num) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(num))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, int num) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(num))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, unsigned int num) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(num))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, long num) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(num))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, unsigned long num) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(num))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, float num) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(num))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator +(const StringSumHelper &lhs, double num) {
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if(!a.concat(num))
+        a.invalidate();
+    return a;
+}
+
+StringSumHelper & operator + (const StringSumHelper &lhs, const __FlashStringHelper *rhs)
+{
+    StringSumHelper &a = const_cast<StringSumHelper&>(lhs);
+    if (!a.concat(rhs))
+        a.invalidate();
+    return a;
+}
+
+// /*********************************************/
+// /*  Comparison                               */
+// /*********************************************/
+
+int String::compareTo(const String &s) const {
+    if(!buffer() || !s.buffer()) {
+        if(s.buffer() && s.len() > 0)
+            return 0 - *(unsigned char *) s.buffer();
+        if(buffer() && len() > 0)
+            return *(unsigned char *) buffer();
+        return 0;
+    }
+    return strcmp(buffer(), s.buffer());
+}
+
+unsigned char String::equals(const String &s2) const {
+    return (len() == s2.len() && compareTo(s2) == 0);
+}
+
+unsigned char String::equals(const char *cstr) const {
+    if(len() == 0)
+        return (cstr == NULL || *cstr == 0);
+    if(cstr == NULL)
+        return buffer()[0] == 0;
+    return strcmp(buffer(), cstr) == 0;
+}
+
+unsigned char String::operator<(const String &rhs) const {
+    return compareTo(rhs) < 0;
+}
+
+unsigned char String::operator>(const String &rhs) const {
+    return compareTo(rhs) > 0;
+}
+
+unsigned char String::operator<=(const String &rhs) const {
+    return compareTo(rhs) <= 0;
+}
+
+unsigned char String::operator>=(const String &rhs) const {
+    return compareTo(rhs) >= 0;
+}
+
+unsigned char String::equalsIgnoreCase(const String &s2) const {
+    if(this == &s2)
+        return 1;
+    if(len() != s2.len())
+        return 0;
+    if(len() == 0)
+        return 1;
+    const char *p1 = buffer();
+    const char *p2 = s2.buffer();
+    while(*p1) {
+        if(tolower(*p1++) != tolower(*p2++))
+            return 0;
+    }
+    return 1;
+}
+
+unsigned char String::equalsConstantTime(const String &s2) const {
+    // To avoid possible time-based attacks present function
+    // compares given strings in a constant time.
+    if(len() != s2.len())
+        return 0;
+    //at this point lengths are the same
+    if(len() == 0)
+        return 1;
+    //at this point lenghts are the same and non-zero
+    const char *p1 = buffer();
+    const char *p2 = s2.buffer();
+    unsigned int equalchars = 0;
+    unsigned int diffchars = 0;
+    while(*p1) {
+        if(*p1 == *p2)
+            ++equalchars;
+        else
+            ++diffchars;
+        ++p1;
+        ++p2;
+    }
+    //the following should force a constant time eval of the condition without a compiler "logical shortcut"
+    unsigned char equalcond = (equalchars == len());
+    unsigned char diffcond = (diffchars == 0);
+    return (equalcond & diffcond); //bitwise AND
+}
+
+unsigned char String::startsWith(const String &s2) const {
+    if(len() < s2.len())
+        return 0;
+    return startsWith(s2, 0);
+}
+
+unsigned char String::startsWith(const String &s2, unsigned int offset) const {
+    if(offset > (unsigned)(len() - s2.len()) || !buffer() || !s2.buffer())
+        return 0;
+    return strncmp(&buffer()[offset], s2.buffer(), s2.len()) == 0;
+}
+
+unsigned char String::endsWith(const String &s2) const {
+    if(len() < s2.len() || !buffer() || !s2.buffer())
+        return 0;
+    return strcmp(&buffer()[len() - s2.len()], s2.buffer()) == 0;
+}
+
+// /*********************************************/
+// /*  Character Access                         */
+// /*********************************************/
+
+char String::charAt(unsigned int loc) const {
+    return operator[](loc);
+}
+
+void String::setCharAt(unsigned int loc, char c) {
+    if(loc < len())
+        wbuffer()[loc] = c;
+}
+
+char & String::operator[](unsigned int index) {
+    static char dummy_writable_char;
+    if(index >= len() || !buffer()) {
+        dummy_writable_char = 0;
+        return dummy_writable_char;
+    }
+    return wbuffer()[index];
+}
+
+char String::operator[](unsigned int index) const {
+    if(index >= len() || !buffer())
+        return 0;
+    return buffer()[index];
+}
+
+void String::getBytes(unsigned char *buf, unsigned int bufsize, unsigned int index) const {
+    if(!bufsize || !buf)
+        return;
+    if(index >= len()) {
+        buf[0] = 0;
+        return;
+    }
+    unsigned int n = bufsize - 1;
+    if(n > len() - index)
+        n = len() - index;
+    strncpy((char *) buf, buffer() + index, n);
+    buf[n] = 0;
+}
+
+// /*********************************************/
+// /*  Search                                   */
+// /*********************************************/
+
+int String::indexOf(char c) const {
+    return indexOf(c, 0);
+}
+
+int String::indexOf(char ch, unsigned int fromIndex) const {
+    if(fromIndex >= len())
+        return -1;
+    const char* temp = strchr(buffer() + fromIndex, ch);
+    if(temp == NULL)
+        return -1;
+    return temp - buffer();
+}
+
+int String::indexOf(const String &s2) const {
+    return indexOf(s2, 0);
+}
+
+int String::indexOf(const String &s2, unsigned int fromIndex) const {
+    if(fromIndex >= len())
+        return -1;
+    const char *found = strstr(buffer() + fromIndex, s2.buffer());
+    if(found == NULL)
+        return -1;
+    return found - buffer();
+}
+
+int String::lastIndexOf(char theChar) const {
+    return lastIndexOf(theChar, len() - 1);
+}
+
+int String::lastIndexOf(char ch, unsigned int fromIndex) const {
+    if(fromIndex >= len())
+        return -1;
+    char tempchar = buffer()[fromIndex + 1];
+    wbuffer()[fromIndex + 1] = '\0';
+    char* temp = strrchr(wbuffer(), ch);
+    wbuffer()[fromIndex + 1] = tempchar;
+    if(temp == NULL)
+        return -1;
+    return temp - buffer();
+}
+
+int String::lastIndexOf(const String &s2) const {
+    return lastIndexOf(s2, len() - s2.len());
+}
+
+int String::lastIndexOf(const String &s2, unsigned int fromIndex) const {
+    if(s2.len() == 0 || len() == 0 || s2.len() > len())
+        return -1;
+    if(fromIndex >= len())
+        fromIndex = len() - 1;
+    int found = -1;
+    for(char *p = wbuffer(); p <= wbuffer() + fromIndex; p++) {
+        p = strstr(p, s2.buffer());
+        if(!p)
+            break;
+        if((unsigned int) (p - wbuffer()) <= fromIndex)
+            found = p - buffer();
+    }
+    return found;
+}
+
+String String::substring(unsigned int left, unsigned int right) const {
+    if(left > right) {
+        unsigned int temp = right;
+        right = left;
+        left = temp;
+    }
+    String out;
+    if(left >= len())
+        return out;
+    if(right > len())
+        right = len();
+    char temp = buffer()[right];  // save the replaced character
+    wbuffer()[right] = '\0';
+    out = wbuffer() + left;  // pointer arithmetic
+    wbuffer()[right] = temp;  //restore character
+    return out;
+}
+
+// /*********************************************/
+// /*  Modification                             */
+// /*********************************************/
+
+void String::replace(char find, char replace) {
+    if(!buffer())
+        return;
+    for(char *p = wbuffer(); *p; p++) {
+        if(*p == find)
+            *p = replace;
+    }
+}
+
+void String::replace(const String& find, const String& replace) {
+    if(len() == 0 || find.len() == 0)
+        return;
+    int diff = replace.len() - find.len();
+    char *readFrom = wbuffer();
+    char *foundAt;
+    if(diff == 0) {
+        while((foundAt = strstr(readFrom, find.buffer())) != NULL) {
+            memmove(foundAt, replace.buffer(), replace.len());
+            readFrom = foundAt + replace.len();
+        }
+    } else if(diff < 0) {
+        char *writeTo = wbuffer();
+        while((foundAt = strstr(readFrom, find.buffer())) != NULL) {
+            unsigned int n = foundAt - readFrom;
+            memmove(writeTo, readFrom, n);
+            writeTo += n;
+            memmove(writeTo, replace.buffer(), replace.len());
+            writeTo += replace.len();
+            readFrom = foundAt + find.len();
+            setLen(len() + diff);
+        }
+        memmove(writeTo, readFrom, strlen(readFrom)+1);
+    } else {
+        unsigned int size = len(); // compute size needed for result
+        while((foundAt = strstr(readFrom, find.buffer())) != NULL) {
+            readFrom = foundAt + find.len();
+            size += diff;
+        }
+        if(size == len())
+            return;
+        if(size > capacity() && !changeBuffer(size))
+            return; // XXX: tell user!
+        int index = len() - 1;
+        while(index >= 0 && (index = lastIndexOf(find, index)) >= 0) {
+            readFrom = wbuffer() + index + find.len();
+            memmove(readFrom + diff, readFrom, len() - (readFrom - buffer()));
+	    int newLen = len() + diff;
+            memmove(wbuffer() + index, replace.buffer(), replace.len());
+            setLen(newLen);
+            wbuffer()[newLen] = 0;
+            index--;
+        }
+    }
+}
+
+void String::remove(unsigned int index) {
+    // Pass the biggest integer as the count. The remove method
+    // below will take care of truncating it at the end of the
+    // string.
+    remove(index, (unsigned int) -1);
+}
+
+void String::remove(unsigned int index, unsigned int count) {
+    if(index >= len()) {
+        return;
+    }
+    if(count <= 0) {
+        return;
+    }
+    if(count > len() - index) {
+        count = len() - index;
+    }
+    char *writeTo = wbuffer() + index;
+    unsigned int newlen = len() - count;
+    setLen(newlen);
+    memmove(writeTo, wbuffer() + index + count, newlen - index);
+    wbuffer()[newlen] = 0;
+}
+
+void String::toLowerCase(void) {
+    if(!buffer())
+        return;
+    for(char *p = wbuffer(); *p; p++) {
+        *p = tolower(*p);
+    }
+}
+
+void String::toUpperCase(void) {
+    if(!buffer())
+        return;
+    for(char *p = wbuffer(); *p; p++) {
+        *p = toupper(*p);
+    }
+}
+
+void String::trim(void) {
+    if(!buffer() || len() == 0)
+        return;
+    char *begin = wbuffer();
+    while(isspace(*begin))
+        begin++;
+    char *end = wbuffer() + len() - 1;
+    while(isspace(*end) && end >= begin)
+        end--;
+    unsigned int newlen = end + 1 - begin;
+    setLen(newlen);
+    if(begin > buffer())
+        memmove(wbuffer(), begin, newlen);
+    wbuffer()[newlen] = 0;
+}
+
+// /*********************************************/
+// /*  Parsing / Conversion                     */
+// /*********************************************/
+
+long String::toInt(void) const {
+    if (buffer())
+        return atol(buffer());
+    return 0;
+}
+
+float String::toFloat(void) const {
+    if (buffer())
+        return atof(buffer());
+    return 0;
+}
+
+double String::toDouble(void) const
+{
+    if (buffer())
+        return atof(buffer());
+    return 0.0;
+}
+
+// global empty string to allow returning const String& with nothing
+
+const String emptyString;

cores/esp32/WString.h

@@ -0,0 +1,362 @@
+/*
+ WString.h - String library for Wiring & Arduino
+ ...mostly rewritten by Paul Stoffregen...
+ Copyright (c) 2009-10 Hernando Barragan.  All right reserved.
+ Copyright 2011, Paul Stoffregen, paul@pjrc.com
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef String_class_h
+#define String_class_h
+#ifdef __cplusplus
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <pgmspace.h>
+#include <stdint.h>
+
+// An inherited class for holding the result of a concatenation.  These
+// result objects are assumed to be writable by subsequent concatenations.
+class StringSumHelper;
+
+// an abstract class used as a means to proide a unique pointer type
+// but really has no body
+class __FlashStringHelper;
+#define FPSTR(pstr_pointer) (reinterpret_cast<const __FlashStringHelper *>(pstr_pointer))
+#define F(string_literal) (FPSTR(PSTR(string_literal)))
+
+// The string class
+class String {
+        // use a function pointer to allow for "if (s)" without the
+        // complications of an operator bool(). for more information, see:
+        // http://www.artima.com/cppsource/safebool.html
+        typedef void (String::*StringIfHelperType)() const;
+        void StringIfHelper() const {
+        }
+
+    public:
+        // constructors
+        // creates a copy of the initial value.
+        // if the initial value is null or invalid, or if memory allocation
+        // fails, the string will be marked as invalid (i.e. "if (s)" will
+        // be false).
+        String(const char *cstr = "");
+        String(const String &str);
+        String(const __FlashStringHelper *str);
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+        String(String &&rval);
+        String(StringSumHelper &&rval);
+#endif
+        explicit String(char c);
+        explicit String(unsigned char, unsigned char base = 10);
+        explicit String(int, unsigned char base = 10);
+        explicit String(unsigned int, unsigned char base = 10);
+        explicit String(long, unsigned char base = 10);
+        explicit String(unsigned long, unsigned char base = 10);
+        explicit String(float, unsigned char decimalPlaces = 2);
+        explicit String(double, unsigned char decimalPlaces = 2);
+        ~String(void);
+
+        // memory management
+        // return true on success, false on failure (in which case, the string
+        // is left unchanged).  reserve(0), if successful, will validate an
+        // invalid string (i.e., "if (s)" will be true afterwards)
+        unsigned char reserve(unsigned int size);
+        inline unsigned int length(void) const {
+            if(buffer()) {
+                return len();
+            } else {
+                return 0;
+            }
+        }
+        inline void clear(void) {
+            setLen(0);
+        }
+        inline bool isEmpty(void) const {
+            return length() == 0;
+        }
+
+        // creates a copy of the assigned value.  if the value is null or
+        // invalid, or if the memory allocation fails, the string will be
+        // marked as invalid ("if (s)" will be false).
+        String & operator =(const String &rhs);
+        String & operator =(const char *cstr);
+        String & operator = (const __FlashStringHelper *str);
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+        String & operator =(String &&rval);
+        String & operator =(StringSumHelper &&rval);
+#endif
+
+        // concatenate (works w/ built-in types)
+
+        // returns true on success, false on failure (in which case, the string
+        // is left unchanged).  if the argument is null or invalid, the
+        // concatenation is considered unsuccessful.
+        unsigned char concat(const String &str);
+        unsigned char concat(const char *cstr);
+        unsigned char concat(char c);
+        unsigned char concat(unsigned char c);
+        unsigned char concat(int num);
+        unsigned char concat(unsigned int num);
+        unsigned char concat(long num);
+        unsigned char concat(unsigned long num);
+        unsigned char concat(float num);
+        unsigned char concat(double num);
+        unsigned char concat(const __FlashStringHelper * str);
+
+        // if there's not enough memory for the concatenated value, the string
+        // will be left unchanged (but this isn't signalled in any way)
+        String & operator +=(const String &rhs) {
+            concat(rhs);
+            return (*this);
+        }
+        String & operator +=(const char *cstr) {
+            concat(cstr);
+            return (*this);
+        }
+        String & operator +=(char c) {
+            concat(c);
+            return (*this);
+        }
+        String & operator +=(unsigned char num) {
+            concat(num);
+            return (*this);
+        }
+        String & operator +=(int num) {
+            concat(num);
+            return (*this);
+        }
+        String & operator +=(unsigned int num) {
+            concat(num);
+            return (*this);
+        }
+        String & operator +=(long num) {
+            concat(num);
+            return (*this);
+        }
+        String & operator +=(unsigned long num) {
+            concat(num);
+            return (*this);
+        }
+        String & operator +=(float num) {
+            concat(num);
+            return (*this);
+        }
+        String & operator +=(double num) {
+            concat(num);
+            return (*this);
+        }
+        String & operator += (const __FlashStringHelper *str){
+            concat(str);
+            return (*this);
+        }
+
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, const String &rhs);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, const char *cstr);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, char c);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, unsigned char num);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, int num);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, unsigned int num);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, long num);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, unsigned long num);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, float num);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, double num);
+        friend StringSumHelper & operator +(const StringSumHelper &lhs, const __FlashStringHelper *rhs);
+
+        // comparison (only works w/ Strings and "strings")
+        operator StringIfHelperType() const {
+            return buffer() ? &String::StringIfHelper : 0;
+        }
+        int compareTo(const String &s) const;
+        unsigned char equals(const String &s) const;
+        unsigned char equals(const char *cstr) const;
+        unsigned char operator ==(const String &rhs) const {
+            return equals(rhs);
+        }
+        unsigned char operator ==(const char *cstr) const {
+            return equals(cstr);
+        }
+        unsigned char operator !=(const String &rhs) const {
+            return !equals(rhs);
+        }
+        unsigned char operator !=(const char *cstr) const {
+            return !equals(cstr);
+        }
+        unsigned char operator <(const String &rhs) const;
+        unsigned char operator >(const String &rhs) const;
+        unsigned char operator <=(const String &rhs) const;
+        unsigned char operator >=(const String &rhs) const;
+        unsigned char equalsIgnoreCase(const String &s) const;
+        unsigned char equalsConstantTime(const String &s) const;
+        unsigned char startsWith(const String &prefix) const;
+        unsigned char startsWith(const char *prefix) const {
+            return this->startsWith(String(prefix));
+        }
+        unsigned char startsWith(const __FlashStringHelper *prefix) const {
+            return this->startsWith(String(prefix));
+        }
+        unsigned char startsWith(const String &prefix, unsigned int offset) const;
+        unsigned char endsWith(const String &suffix) const;
+        unsigned char endsWith(const char *suffix) const {
+            return this->endsWith(String(suffix));
+        }
+        unsigned char endsWith(const __FlashStringHelper * suffix) const {
+            return this->endsWith(String(suffix));
+        }
+
+        // character access
+        char charAt(unsigned int index) const;
+        void setCharAt(unsigned int index, char c);
+        char operator [](unsigned int index) const;
+        char& operator [](unsigned int index);
+        void getBytes(unsigned char *buf, unsigned int bufsize, unsigned int index = 0) const;
+        void toCharArray(char *buf, unsigned int bufsize, unsigned int index = 0) const {
+            getBytes((unsigned char *) buf, bufsize, index);
+        }
+        const char* c_str() const { return buffer(); }
+        char* begin() { return wbuffer(); }
+        char* end() { return wbuffer() + length(); }
+        const char* begin() const { return c_str(); }
+        const char* end() const { return c_str() + length(); }
+
+        // search
+        int indexOf(char ch) const;
+        int indexOf(char ch, unsigned int fromIndex) const;
+        int indexOf(const String &str) const;
+        int indexOf(const String &str, unsigned int fromIndex) const;
+        int lastIndexOf(char ch) const;
+        int lastIndexOf(char ch, unsigned int fromIndex) const;
+        int lastIndexOf(const String &str) const;
+        int lastIndexOf(const String &str, unsigned int fromIndex) const;
+        String substring(unsigned int beginIndex) const {
+            return substring(beginIndex, len());
+        }
+        ;
+        String substring(unsigned int beginIndex, unsigned int endIndex) const;
+
+        // modification
+        void replace(char find, char replace);
+        void replace(const String &find, const String &replace);
+        void replace(const char *find, const String &replace) {
+            this->replace(String(find), replace);
+        }
+        void replace(const __FlashStringHelper *find, const String &replace) {
+            this->replace(String(find), replace);
+        }
+        void replace(const char *find, const char *replace) {
+            this->replace(String(find), String(replace));
+        }
+        void replace(const __FlashStringHelper *find, const char *replace) {
+            this->replace(String(find), String(replace));
+        }
+        void replace(const __FlashStringHelper *find, const __FlashStringHelper *replace) {
+            this->replace(String(find), String(replace));
+        }
+        void remove(unsigned int index);
+        void remove(unsigned int index, unsigned int count);
+        void toLowerCase(void);
+        void toUpperCase(void);
+        void trim(void);
+
+        // parsing/conversion
+        long toInt(void) const;
+        float toFloat(void) const;
+	double toDouble(void) const;
+
+    protected:
+        // Contains the string info when we're not in SSO mode
+        struct _ptr { 
+            char *   buff;
+            uint16_t cap;
+            uint16_t len;
+        };
+        // This allows strings up up to 11 (10 + \0 termination) without any extra space.
+        enum { SSOSIZE = sizeof(struct _ptr) + 4 - 1 }; // Characters to allocate space for SSO, must be 12 or more
+        struct _sso {
+            char     buff[SSOSIZE];
+            unsigned char len   : 7; // Ensure only one byte is allocated by GCC for the bitfields
+            unsigned char isSSO : 1;
+        } __attribute__((packed)); // Ensure that GCC doesn't expand the flag byte to a 32-bit word for alignment issues
+        enum { CAPACITY_MAX = 65535 }; // If typeof(cap) changed from uint16_t, be sure to update this enum to the max value storable in the type
+        union {
+            struct _ptr ptr;
+            struct _sso sso;
+        };
+        // Accessor functions
+        inline bool isSSO() const { return sso.isSSO; }
+        inline unsigned int len() const { return isSSO() ? sso.len : ptr.len; }
+        inline unsigned int capacity() const { return isSSO() ? (unsigned int)SSOSIZE - 1 : ptr.cap; } // Size of max string not including terminal NUL
+        inline void setSSO(bool set) { sso.isSSO = set; }
+        inline void setLen(int len) { if (isSSO()) sso.len = len; else ptr.len = len; }
+        inline void setCapacity(int cap) { if (!isSSO()) ptr.cap = cap; }
+	inline void setBuffer(char *buff) { if (!isSSO()) ptr.buff = buff; }
+        // Buffer accessor functions
+        inline const char *buffer() const { return (const char *)(isSSO() ? sso.buff : ptr.buff); }
+        inline char *wbuffer() const { return isSSO() ? const_cast<char *>(sso.buff) : ptr.buff; } // Writable version of buffer
+
+    protected:
+        void init(void);
+        void invalidate(void);
+        unsigned char changeBuffer(unsigned int maxStrLen);
+        unsigned char concat(const char *cstr, unsigned int length);
+
+        // copy and move
+        String & copy(const char *cstr, unsigned int length);
+        String & copy(const __FlashStringHelper *pstr, unsigned int length);
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+        void move(String &rhs);
+#endif
+};
+
+class StringSumHelper: public String {
+    public:
+        StringSumHelper(const String &s) :
+                String(s) {
+        }
+        StringSumHelper(const char *p) :
+                String(p) {
+        }
+        StringSumHelper(char c) :
+                String(c) {
+        }
+        StringSumHelper(unsigned char num) :
+                String(num) {
+        }
+        StringSumHelper(int num) :
+                String(num) {
+        }
+        StringSumHelper(unsigned int num) :
+                String(num) {
+        }
+        StringSumHelper(long num) :
+                String(num) {
+        }
+        StringSumHelper(unsigned long num) :
+                String(num) {
+        }
+        StringSumHelper(float num) :
+                String(num) {
+        }
+        StringSumHelper(double num) :
+                String(num) {
+        }
+};
+
+extern const String emptyString;
+
+#endif  // __cplusplus
+#endif  // String_class_h

cores/esp32/apps/sntp/sntp.h

@@ -0,0 +1 @@
+#include "lwip/apps/sntp.h"

cores/esp32/base64.cpp

@@ -0,0 +1,64 @@
+/**
+ * base64.cpp
+ *
+ * Created on: 09.12.2015
+ *
+ * Copyright (c) 2015 Markus Sattler. All rights reserved.
+ * This file is part of the ESP31B core for Arduino.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include "Arduino.h"
+extern "C" {
+#include "libb64/cdecode.h"
+#include "libb64/cencode.h"
+}
+#include "base64.h"
+
+/**
+ * convert input data to base64
+ * @param data const uint8_t *
+ * @param length size_t
+ * @return String
+ */
+String base64::encode(const uint8_t * data, size_t length)
+{
+    size_t size = base64_encode_expected_len(length) + 1;
+    char * buffer = (char *) malloc(size);
+    if(buffer) {
+        base64_encodestate _state;
+        base64_init_encodestate(&_state);
+        int len = base64_encode_block((const char *) &data[0], length, &buffer[0], &_state);
+        len = base64_encode_blockend((buffer + len), &_state);
+
+        String base64 = String(buffer);
+        free(buffer);
+        return base64;
+    }
+    return String("-FAIL-");
+}
+
+/**
+ * convert input data to base64
+ * @param text const String&
+ * @return String
+ */
+String base64::encode(const String& text)
+{
+    return base64::encode((uint8_t *) text.c_str(), text.length());
+}
+

cores/esp32/base64.h

@@ -0,0 +1,13 @@
+#ifndef CORE_BASE64_H_
+#define CORE_BASE64_H_
+
+class base64
+{
+public:
+    static String encode(const uint8_t * data, size_t length);
+    static String encode(const String& text);
+private:
+};
+
+
+#endif /* CORE_BASE64_H_ */

cores/esp32/binary.h

@@ -0,0 +1,534 @@
+/*
+ binary.h - Definitions for binary constants
+ Copyright (c) 2006 David A. Mellis.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef Binary_h
+#define Binary_h
+
+#define B0 0
+#define B00 0
+#define B000 0
+#define B0000 0
+#define B00000 0
+#define B000000 0
+#define B0000000 0
+#define B00000000 0
+#define B1 1
+#define B01 1
+#define B001 1
+#define B0001 1
+#define B00001 1
+#define B000001 1
+#define B0000001 1
+#define B00000001 1
+#define B10 2
+#define B010 2
+#define B0010 2
+#define B00010 2
+#define B000010 2
+#define B0000010 2
+#define B00000010 2
+#define B11 3
+#define B011 3
+#define B0011 3
+#define B00011 3
+#define B000011 3
+#define B0000011 3
+#define B00000011 3
+#define B100 4
+#define B0100 4
+#define B00100 4
+#define B000100 4
+#define B0000100 4
+#define B00000100 4
+#define B101 5
+#define B0101 5
+#define B00101 5
+#define B000101 5
+#define B0000101 5
+#define B00000101 5
+#define B110 6
+#define B0110 6
+#define B00110 6
+#define B000110 6
+#define B0000110 6
+#define B00000110 6
+#define B111 7
+#define B0111 7
+#define B00111 7
+#define B000111 7
+#define B0000111 7
+#define B00000111 7
+#define B1000 8
+#define B01000 8
+#define B001000 8
+#define B0001000 8
+#define B00001000 8
+#define B1001 9
+#define B01001 9
+#define B001001 9
+#define B0001001 9
+#define B00001001 9
+#define B1010 10
+#define B01010 10
+#define B001010 10
+#define B0001010 10
+#define B00001010 10
+#define B1011 11
+#define B01011 11
+#define B001011 11
+#define B0001011 11
+#define B00001011 11
+#define B1100 12
+#define B01100 12
+#define B001100 12
+#define B0001100 12
+#define B00001100 12
+#define B1101 13
+#define B01101 13
+#define B001101 13
+#define B0001101 13
+#define B00001101 13
+#define B1110 14
+#define B01110 14
+#define B001110 14
+#define B0001110 14
+#define B00001110 14
+#define B1111 15
+#define B01111 15
+#define B001111 15
+#define B0001111 15
+#define B00001111 15
+#define B10000 16
+#define B010000 16
+#define B0010000 16
+#define B00010000 16
+#define B10001 17
+#define B010001 17
+#define B0010001 17
+#define B00010001 17
+#define B10010 18
+#define B010010 18
+#define B0010010 18
+#define B00010010 18
+#define B10011 19
+#define B010011 19
+#define B0010011 19
+#define B00010011 19
+#define B10100 20
+#define B010100 20
+#define B0010100 20
+#define B00010100 20
+#define B10101 21
+#define B010101 21
+#define B0010101 21
+#define B00010101 21
+#define B10110 22
+#define B010110 22
+#define B0010110 22
+#define B00010110 22
+#define B10111 23
+#define B010111 23
+#define B0010111 23
+#define B00010111 23
+#define B11000 24
+#define B011000 24
+#define B0011000 24
+#define B00011000 24
+#define B11001 25
+#define B011001 25
+#define B0011001 25
+#define B00011001 25
+#define B11010 26
+#define B011010 26
+#define B0011010 26
+#define B00011010 26
+#define B11011 27
+#define B011011 27
+#define B0011011 27
+#define B00011011 27
+#define B11100 28
+#define B011100 28
+#define B0011100 28
+#define B00011100 28
+#define B11101 29
+#define B011101 29
+#define B0011101 29
+#define B00011101 29
+#define B11110 30
+#define B011110 30
+#define B0011110 30
+#define B00011110 30
+#define B11111 31
+#define B011111 31
+#define B0011111 31
+#define B00011111 31
+#define B100000 32
+#define B0100000 32
+#define B00100000 32
+#define B100001 33
+#define B0100001 33
+#define B00100001 33
+#define B100010 34
+#define B0100010 34
+#define B00100010 34
+#define B100011 35
+#define B0100011 35
+#define B00100011 35
+#define B100100 36
+#define B0100100 36
+#define B00100100 36
+#define B100101 37
+#define B0100101 37
+#define B00100101 37
+#define B100110 38
+#define B0100110 38
+#define B00100110 38
+#define B100111 39
+#define B0100111 39
+#define B00100111 39
+#define B101000 40
+#define B0101000 40
+#define B00101000 40
+#define B101001 41
+#define B0101001 41
+#define B00101001 41
+#define B101010 42
+#define B0101010 42
+#define B00101010 42
+#define B101011 43
+#define B0101011 43
+#define B00101011 43
+#define B101100 44
+#define B0101100 44
+#define B00101100 44
+#define B101101 45
+#define B0101101 45
+#define B00101101 45
+#define B101110 46
+#define B0101110 46
+#define B00101110 46
+#define B101111 47
+#define B0101111 47
+#define B00101111 47
+#define B110000 48
+#define B0110000 48
+#define B00110000 48
+#define B110001 49
+#define B0110001 49
+#define B00110001 49
+#define B110010 50
+#define B0110010 50
+#define B00110010 50
+#define B110011 51
+#define B0110011 51
+#define B00110011 51
+#define B110100 52
+#define B0110100 52
+#define B00110100 52
+#define B110101 53
+#define B0110101 53
+#define B00110101 53
+#define B110110 54
+#define B0110110 54
+#define B00110110 54
+#define B110111 55
+#define B0110111 55
+#define B00110111 55
+#define B111000 56
+#define B0111000 56
+#define B00111000 56
+#define B111001 57
+#define B0111001 57
+#define B00111001 57
+#define B111010 58
+#define B0111010 58
+#define B00111010 58
+#define B111011 59
+#define B0111011 59
+#define B00111011 59
+#define B111100 60
+#define B0111100 60
+#define B00111100 60
+#define B111101 61
+#define B0111101 61
+#define B00111101 61
+#define B111110 62
+#define B0111110 62
+#define B00111110 62
+#define B111111 63
+#define B0111111 63
+#define B00111111 63
+#define B1000000 64
+#define B01000000 64
+#define B1000001 65
+#define B01000001 65
+#define B1000010 66
+#define B01000010 66
+#define B1000011 67
+#define B01000011 67
+#define B1000100 68
+#define B01000100 68
+#define B1000101 69
+#define B01000101 69
+#define B1000110 70
+#define B01000110 70
+#define B1000111 71
+#define B01000111 71
+#define B1001000 72
+#define B01001000 72
+#define B1001001 73
+#define B01001001 73
+#define B1001010 74
+#define B01001010 74
+#define B1001011 75
+#define B01001011 75
+#define B1001100 76
+#define B01001100 76
+#define B1001101 77
+#define B01001101 77
+#define B1001110 78
+#define B01001110 78
+#define B1001111 79
+#define B01001111 79
+#define B1010000 80
+#define B01010000 80
+#define B1010001 81
+#define B01010001 81
+#define B1010010 82
+#define B01010010 82
+#define B1010011 83
+#define B01010011 83
+#define B1010100 84
+#define B01010100 84
+#define B1010101 85
+#define B01010101 85
+#define B1010110 86
+#define B01010110 86
+#define B1010111 87
+#define B01010111 87
+#define B1011000 88
+#define B01011000 88
+#define B1011001 89
+#define B01011001 89
+#define B1011010 90
+#define B01011010 90
+#define B1011011 91
+#define B01011011 91
+#define B1011100 92
+#define B01011100 92
+#define B1011101 93
+#define B01011101 93
+#define B1011110 94
+#define B01011110 94
+#define B1011111 95
+#define B01011111 95
+#define B1100000 96
+#define B01100000 96
+#define B1100001 97
+#define B01100001 97
+#define B1100010 98
+#define B01100010 98
+#define B1100011 99
+#define B01100011 99
+#define B1100100 100
+#define B01100100 100
+#define B1100101 101
+#define B01100101 101
+#define B1100110 102
+#define B01100110 102
+#define B1100111 103
+#define B01100111 103
+#define B1101000 104
+#define B01101000 104
+#define B1101001 105
+#define B01101001 105
+#define B1101010 106
+#define B01101010 106
+#define B1101011 107
+#define B01101011 107
+#define B1101100 108
+#define B01101100 108
+#define B1101101 109
+#define B01101101 109
+#define B1101110 110
+#define B01101110 110
+#define B1101111 111
+#define B01101111 111
+#define B1110000 112
+#define B01110000 112
+#define B1110001 113
+#define B01110001 113
+#define B1110010 114
+#define B01110010 114
+#define B1110011 115
+#define B01110011 115
+#define B1110100 116
+#define B01110100 116
+#define B1110101 117
+#define B01110101 117
+#define B1110110 118
+#define B01110110 118
+#define B1110111 119
+#define B01110111 119
+#define B1111000 120
+#define B01111000 120
+#define B1111001 121
+#define B01111001 121
+#define B1111010 122
+#define B01111010 122
+#define B1111011 123
+#define B01111011 123
+#define B1111100 124
+#define B01111100 124
+#define B1111101 125
+#define B01111101 125
+#define B1111110 126
+#define B01111110 126
+#define B1111111 127
+#define B01111111 127
+#define B10000000 128
+#define B10000001 129
+#define B10000010 130
+#define B10000011 131
+#define B10000100 132
+#define B10000101 133
+#define B10000110 134
+#define B10000111 135
+#define B10001000 136
+#define B10001001 137
+#define B10001010 138
+#define B10001011 139
+#define B10001100 140
+#define B10001101 141
+#define B10001110 142
+#define B10001111 143
+#define B10010000 144
+#define B10010001 145
+#define B10010010 146
+#define B10010011 147
+#define B10010100 148
+#define B10010101 149
+#define B10010110 150
+#define B10010111 151
+#define B10011000 152
+#define B10011001 153
+#define B10011010 154
+#define B10011011 155
+#define B10011100 156
+#define B10011101 157
+#define B10011110 158
+#define B10011111 159
+#define B10100000 160
+#define B10100001 161
+#define B10100010 162
+#define B10100011 163
+#define B10100100 164
+#define B10100101 165
+#define B10100110 166
+#define B10100111 167
+#define B10101000 168
+#define B10101001 169
+#define B10101010 170
+#define B10101011 171
+#define B10101100 172
+#define B10101101 173
+#define B10101110 174
+#define B10101111 175
+#define B10110000 176
+#define B10110001 177
+#define B10110010 178
+#define B10110011 179
+#define B10110100 180
+#define B10110101 181
+#define B10110110 182
+#define B10110111 183
+#define B10111000 184
+#define B10111001 185
+#define B10111010 186
+#define B10111011 187
+#define B10111100 188
+#define B10111101 189
+#define B10111110 190
+#define B10111111 191
+#define B11000000 192
+#define B11000001 193
+#define B11000010 194
+#define B11000011 195
+#define B11000100 196
+#define B11000101 197
+#define B11000110 198
+#define B11000111 199
+#define B11001000 200
+#define B11001001 201
+#define B11001010 202
+#define B11001011 203
+#define B11001100 204
+#define B11001101 205
+#define B11001110 206
+#define B11001111 207
+#define B11010000 208
+#define B11010001 209
+#define B11010010 210
+#define B11010011 211
+#define B11010100 212
+#define B11010101 213
+#define B11010110 214
+#define B11010111 215
+#define B11011000 216
+#define B11011001 217
+#define B11011010 218
+#define B11011011 219
+#define B11011100 220
+#define B11011101 221
+#define B11011110 222
+#define B11011111 223
+#define B11100000 224
+#define B11100001 225
+#define B11100010 226
+#define B11100011 227
+#define B11100100 228
+#define B11100101 229
+#define B11100110 230
+#define B11100111 231
+#define B11101000 232
+#define B11101001 233
+#define B11101010 234
+#define B11101011 235
+#define B11101100 236
+#define B11101101 237
+#define B11101110 238
+#define B11101111 239
+#define B11110000 240
+#define B11110001 241
+#define B11110010 242
+#define B11110011 243
+#define B11110100 244
+#define B11110101 245
+#define B11110110 246
+#define B11110111 247
+#define B11111000 248
+#define B11111001 249
+#define B11111010 250
+#define B11111011 251
+#define B11111100 252
+#define B11111101 253
+#define B11111110 254
+#define B11111111 255
+
+#endif

cores/esp32/cbuf.cpp

@@ -0,0 +1,196 @@
+/*
+ cbuf.cpp - Circular buffer implementation
+ Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
+ This file is part of the esp8266 core for Arduino environment.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "cbuf.h"
+
+cbuf::cbuf(size_t size) :
+    next(NULL), _size(size+1), _buf(new char[size+1]), _bufend(_buf + size + 1), _begin(_buf), _end(_begin)
+{
+}
+
+cbuf::~cbuf()
+{
+    delete[] _buf;
+}
+
+size_t cbuf::resizeAdd(size_t addSize)
+{
+    return resize(_size + addSize);
+}
+
+size_t cbuf::resize(size_t newSize)
+{
+
+    size_t bytes_available = available();
+    newSize += 1;
+    // not lose any data
+    // if data can be lost use remove or flush before resize
+    if((newSize < bytes_available) || (newSize == _size)) {
+        return _size;
+    }
+
+    char *newbuf = new char[newSize];
+    char *oldbuf = _buf;
+
+    if(!newbuf) {
+        return _size;
+    }
+
+    if(_buf) {
+        read(newbuf, bytes_available);
+        memset((newbuf + bytes_available), 0x00, (newSize - bytes_available));
+    }
+
+    _begin = newbuf;
+    _end = newbuf + bytes_available;
+    _bufend = newbuf + newSize;
+    _size = newSize;
+
+    _buf = newbuf;
+    delete[] oldbuf;
+
+    return _size;
+}
+
+size_t cbuf::available() const
+{
+    if(_end >= _begin) {
+        return _end - _begin;
+    }
+    return _size - (_begin - _end);
+}
+
+size_t cbuf::size()
+{
+    return _size;
+}
+
+size_t cbuf::room() const
+{
+    if(_end >= _begin) {
+        return _size - (_end - _begin) - 1;
+    }
+    return _begin - _end - 1;
+}
+
+int cbuf::peek()
+{
+    if(empty()) {
+        return -1;
+    }
+
+    return static_cast<int>(*_begin);
+}
+
+size_t cbuf::peek(char *dst, size_t size)
+{
+    size_t bytes_available = available();
+    size_t size_to_read = (size < bytes_available) ? size : bytes_available;
+    size_t size_read = size_to_read;
+    char * begin = _begin;
+    if(_end < _begin && size_to_read > (size_t) (_bufend - _begin)) {
+        size_t top_size = _bufend - _begin;
+        memcpy(dst, _begin, top_size);
+        begin = _buf;
+        size_to_read -= top_size;
+        dst += top_size;
+    }
+    memcpy(dst, begin, size_to_read);
+    return size_read;
+}
+
+int cbuf::read()
+{
+    if(empty()) {
+        return -1;
+    }
+
+    char result = *_begin;
+    _begin = wrap_if_bufend(_begin + 1);
+    return static_cast<int>(result);
+}
+
+size_t cbuf::read(char* dst, size_t size)
+{
+    size_t bytes_available = available();
+    size_t size_to_read = (size < bytes_available) ? size : bytes_available;
+    size_t size_read = size_to_read;
+    if(_end < _begin && size_to_read > (size_t) (_bufend - _begin)) {
+        size_t top_size = _bufend - _begin;
+        memcpy(dst, _begin, top_size);
+        _begin = _buf;
+        size_to_read -= top_size;
+        dst += top_size;
+    }
+    memcpy(dst, _begin, size_to_read);
+    _begin = wrap_if_bufend(_begin + size_to_read);
+    return size_read;
+}
+
+size_t cbuf::write(char c)
+{
+    if(full()) {
+        return 0;
+    }
+
+    *_end = c;
+    _end = wrap_if_bufend(_end + 1);
+    return 1;
+}
+
+size_t cbuf::write(const char* src, size_t size)
+{
+    size_t bytes_available = room();
+    size_t size_to_write = (size < bytes_available) ? size : bytes_available;
+    size_t size_written = size_to_write;
+    if(_end >= _begin && size_to_write > (size_t) (_bufend - _end)) {
+        size_t top_size = _bufend - _end;
+        memcpy(_end, src, top_size);
+        _end = _buf;
+        size_to_write -= top_size;
+        src += top_size;
+    }
+    memcpy(_end, src, size_to_write);
+    _end = wrap_if_bufend(_end + size_to_write);
+    return size_written;
+}
+
+void cbuf::flush()
+{
+    _begin = _buf;
+    _end = _buf;
+}
+
+size_t cbuf::remove(size_t size)
+{
+    size_t bytes_available = available();
+    if(size >= bytes_available) {
+        flush();
+        return 0;
+    }
+    size_t size_to_remove = (size < bytes_available) ? size : bytes_available;
+    if(_end < _begin && size_to_remove > (size_t) (_bufend - _begin)) {
+        size_t top_size = _bufend - _begin;
+        _begin = _buf;
+        size_to_remove -= top_size;
+    }
+    _begin = wrap_if_bufend(_begin + size_to_remove);
+    return available();
+}

cores/esp32/cbuf.h

@@ -0,0 +1,79 @@
+/*
+ cbuf.h - Circular buffer implementation
+ Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
+ This file is part of the esp8266 core for Arduino environment.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __cbuf_h
+#define __cbuf_h
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+class cbuf
+{
+public:
+    cbuf(size_t size);
+    ~cbuf();
+
+    size_t resizeAdd(size_t addSize);
+    size_t resize(size_t newSize);
+    size_t available() const;
+    size_t size();
+
+    size_t room() const;
+
+    inline bool empty() const
+    {
+        return _begin == _end;
+    }
+
+    inline bool full() const
+    {
+        return wrap_if_bufend(_end + 1) == _begin;
+    }
+
+    int peek();
+    size_t peek(char *dst, size_t size);
+
+    int read();
+    size_t read(char* dst, size_t size);
+
+    size_t write(char c);
+    size_t write(const char* src, size_t size);
+
+    void flush();
+    size_t remove(size_t size);
+
+    cbuf *next;
+
+private:
+    inline char* wrap_if_bufend(char* ptr) const
+    {
+        return (ptr == _bufend) ? _buf : ptr;
+    }
+
+    size_t _size;
+    char* _buf;
+    const char* _bufend;
+    char* _begin;
+    char* _end;
+
+};
+
+#endif//__cbuf_h

cores/esp32/esp32-hal-adc.c

@@ -0,0 +1,279 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal-adc.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_attr.h"
+#include "soc/rtc_io_reg.h"
+#include "soc/rtc_cntl_reg.h"
+#include "soc/sens_reg.h"
+
+#include "driver/adc.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp_adc_cal.h"
+#include "esp32/rom/ets_sys.h"
+#include "esp_intr_alloc.h"
+#define DEFAULT_VREF    1100
+static esp_adc_cal_characteristics_t *__analogCharacteristics[2] = {NULL, NULL};
+static uint16_t __analogVRef = 0;
+static uint8_t __analogVRefPin = 0;
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/ets_sys.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/ets_sys.h"
+#include "esp_intr.h"
+#endif
+
+static uint8_t __analogAttenuation = 3;//11db
+static uint8_t __analogWidth = 3;//12 bits
+static uint8_t __analogClockDiv = 1;
+
+void __analogSetClockDiv(uint8_t clockDiv){
+    if(!clockDiv){
+        clockDiv = 1;
+    }
+    __analogClockDiv = clockDiv;
+    adc_set_clk_div(__analogClockDiv);
+}
+
+void __analogSetAttenuation(adc_attenuation_t attenuation)
+{
+    __analogAttenuation = attenuation & 3;
+}
+
+#if CONFIG_IDF_TARGET_ESP32
+void __analogSetWidth(uint8_t bits){
+    if(bits < 9){
+        bits = 9;
+    } else if(bits > 12){
+        bits = 12;
+    }
+    __analogWidth = bits - 9;
+    adc1_config_width(__analogWidth);
+}
+#endif
+
+void __analogInit(){
+    static bool initialized = false;
+    if(initialized){
+        return;
+    }
+    initialized = true;
+    __analogSetClockDiv(__analogClockDiv);
+#if CONFIG_IDF_TARGET_ESP32
+    __analogSetWidth(__analogWidth + 9);//in bits
+#endif
+}
+
+void __analogSetPinAttenuation(uint8_t pin, adc_attenuation_t attenuation)
+{
+    int8_t channel = digitalPinToAnalogChannel(pin);
+    if(channel < 0 || attenuation > 3){
+        return ;
+    }
+    if(channel > 9){
+        adc2_config_channel_atten(channel - 10, attenuation);
+    } else {
+        adc1_config_channel_atten(channel, attenuation);
+    }
+    __analogInit();
+}
+
+bool __adcAttachPin(uint8_t pin){
+    int8_t channel = digitalPinToAnalogChannel(pin);
+    if(channel < 0){
+        log_e("Pin %u is not ADC pin!", pin);
+        return false;
+    }
+    int8_t pad = digitalPinToTouchChannel(pin);
+    if(pad >= 0){
+#if CONFIG_IDF_TARGET_ESP32
+        uint32_t touch = READ_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG);
+        if(touch & (1 << pad)){
+            touch &= ~((1 << (pad + SENS_TOUCH_PAD_OUTEN2_S))
+                    | (1 << (pad + SENS_TOUCH_PAD_OUTEN1_S))
+                    | (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)));
+            WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, touch);
+        }
+#endif
+    } else if(pin == 25){
+        CLEAR_PERI_REG_MASK(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_XPD_DAC | RTC_IO_PDAC1_DAC_XPD_FORCE);//stop dac1
+    } else if(pin == 26){
+        CLEAR_PERI_REG_MASK(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_XPD_DAC | RTC_IO_PDAC2_DAC_XPD_FORCE);//stop dac2
+    }
+
+    pinMode(pin, ANALOG);
+    __analogSetPinAttenuation(pin, __analogAttenuation);
+    return true;
+}
+
+void __analogReadResolution(uint8_t bits)
+{
+    if(!bits || bits > 16){
+        return;
+    }
+#if CONFIG_IDF_TARGET_ESP32
+    __analogSetWidth(bits);         // hadware from 9 to 12
+#endif
+}
+
+uint16_t __analogRead(uint8_t pin)
+{
+    int8_t channel = digitalPinToAnalogChannel(pin);
+    int value = 0;
+    esp_err_t r = ESP_OK;
+    if(channel < 0){
+        log_e("Pin %u is not ADC pin!", pin);
+        return value;
+    }
+    __adcAttachPin(pin);
+    if(channel > 9){
+        channel -= 10;
+        r = adc2_get_raw( channel, __analogWidth, &value);
+        if ( r == ESP_OK ) {
+            return value;
+        } else if ( r == ESP_ERR_INVALID_STATE ) {
+            log_e("GPIO%u: %s: ADC2 not initialized yet.", pin, esp_err_to_name(r));
+        } else if ( r == ESP_ERR_TIMEOUT ) {
+            log_e("GPIO%u: %s: ADC2 is in use by Wi-Fi.", pin, esp_err_to_name(r));
+        } else {
+            log_e("GPIO%u: %s", pin, esp_err_to_name(r));
+        }
+    } else {
+        return adc1_get_raw(channel);
+    }
+    return value;
+}
+
+uint32_t __analogReadMilliVolts(uint8_t pin){
+    int8_t channel = digitalPinToAnalogChannel(pin);
+    if(channel < 0){
+        log_e("Pin %u is not ADC pin!", pin);
+        return 0;
+    }
+#if CONFIG_IDF_TARGET_ESP32
+    if(!__analogVRef){
+        if (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_TP) == ESP_OK) {
+            log_d("eFuse Two Point: Supported");
+            __analogVRef = DEFAULT_VREF;
+        }
+        if (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_VREF) == ESP_OK) {
+            log_d("eFuse Vref: Supported");
+            __analogVRef = DEFAULT_VREF;
+        }
+        if(!__analogVRef){
+            __analogVRef = DEFAULT_VREF;
+            if(__analogVRefPin){
+                esp_adc_cal_characteristics_t chars;
+                if(adc2_vref_to_gpio(__analogVRefPin) == ESP_OK){
+                    __analogVRef = __analogRead(__analogVRefPin);
+                    esp_adc_cal_characterize(1, __analogAttenuation, __analogWidth, DEFAULT_VREF, &chars);
+                    __analogVRef = esp_adc_cal_raw_to_voltage(__analogVRef, &chars);
+                    log_d("Vref to GPIO%u: %u", __analogVRefPin, __analogVRef);
+                }
+            }
+        }
+    }
+    uint8_t unit = 1;
+    if(channel > 9){
+        unit = 2;
+    }
+    uint16_t adc_reading = __analogRead(pin);
+    if(__analogCharacteristics[unit - 1] == NULL){
+        __analogCharacteristics[unit - 1] = calloc(1, sizeof(esp_adc_cal_characteristics_t));
+        if(__analogCharacteristics[unit - 1] == NULL){
+            return 0;
+        }
+        esp_adc_cal_value_t val_type = esp_adc_cal_characterize(unit, __analogAttenuation, __analogWidth, __analogVRef, __analogCharacteristics[unit - 1]);
+        if (val_type == ESP_ADC_CAL_VAL_EFUSE_TP) {
+            log_i("ADC%u: Characterized using Two Point Value: %u\n", unit, __analogCharacteristics[unit - 1]->vref);
+        } else if (val_type == ESP_ADC_CAL_VAL_EFUSE_VREF) {
+            log_i("ADC%u: Characterized using eFuse Vref: %u\n", unit, __analogCharacteristics[unit - 1]->vref);
+        } else if(__analogVRef != DEFAULT_VREF){
+            log_i("ADC%u: Characterized using Vref to GPIO%u: %u\n", unit, __analogVRefPin, __analogCharacteristics[unit - 1]->vref);
+        } else {
+            log_i("ADC%u: Characterized using Default Vref: %u\n", unit, __analogCharacteristics[unit - 1]->vref);
+        }
+    }
+    return esp_adc_cal_raw_to_voltage(adc_reading, __analogCharacteristics[unit - 1]);
+#else
+    uint16_t adc_reading = __analogRead(pin);
+    uint16_t max_reading = 8191;
+    uint16_t max_mv = 1100;
+    switch(__analogAttenuation){
+        case 3: max_mv = 3900; break;
+        case 2: max_mv = 2200; break;
+        case 1: max_mv = 1500; break;
+        default: break;
+    }
+    return (adc_reading * max_mv) / max_reading;
+#endif
+}
+
+#if CONFIG_IDF_TARGET_ESP32
+
+void __analogSetVRefPin(uint8_t pin){
+    if(pin <25 || pin > 27){
+        pin = 0;
+    }
+    __analogVRefPin = pin;
+}
+
+int __hallRead()    //hall sensor without LNA
+{
+    int Sens_Vp0;
+    int Sens_Vn0;
+    int Sens_Vp1;
+    int Sens_Vn1;
+
+    pinMode(36, ANALOG);
+    pinMode(39, ANALOG);
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_XPD_HALL_FORCE_M);     // hall sens force enable
+    SET_PERI_REG_MASK(RTC_IO_HALL_SENS_REG, RTC_IO_XPD_HALL);               // xpd hall
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_HALL_PHASE_FORCE_M);   // phase force
+    CLEAR_PERI_REG_MASK(RTC_IO_HALL_SENS_REG, RTC_IO_HALL_PHASE);           // hall phase
+    Sens_Vp0 = __analogRead(36);
+    Sens_Vn0 = __analogRead(39);
+    SET_PERI_REG_MASK(RTC_IO_HALL_SENS_REG, RTC_IO_HALL_PHASE);
+    Sens_Vp1 = __analogRead(36);
+    Sens_Vn1 = __analogRead(39);
+    SET_PERI_REG_BITS(SENS_SAR_MEAS_WAIT2_REG, SENS_FORCE_XPD_SAR, 0, SENS_FORCE_XPD_SAR_S);
+    CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_XPD_HALL_FORCE);
+    CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_HALL_PHASE_FORCE);
+    return (Sens_Vp1 - Sens_Vp0) - (Sens_Vn1 - Sens_Vn0);
+}
+#endif
+
+extern uint16_t analogRead(uint8_t pin) __attribute__ ((weak, alias("__analogRead")));
+extern uint32_t analogReadMilliVolts(uint8_t pin) __attribute__ ((weak, alias("__analogReadMilliVolts")));
+extern void analogReadResolution(uint8_t bits) __attribute__ ((weak, alias("__analogReadResolution")));
+extern void analogSetClockDiv(uint8_t clockDiv) __attribute__ ((weak, alias("__analogSetClockDiv")));
+extern void analogSetAttenuation(adc_attenuation_t attenuation) __attribute__ ((weak, alias("__analogSetAttenuation")));
+extern void analogSetPinAttenuation(uint8_t pin, adc_attenuation_t attenuation) __attribute__ ((weak, alias("__analogSetPinAttenuation")));
+
+extern bool adcAttachPin(uint8_t pin) __attribute__ ((weak, alias("__adcAttachPin")));
+
+#if CONFIG_IDF_TARGET_ESP32
+extern void analogSetVRefPin(uint8_t pin) __attribute__ ((weak, alias("__analogSetVRefPin")));
+extern void analogSetWidth(uint8_t bits) __attribute__ ((weak, alias("__analogSetWidth")));
+extern int hallRead() __attribute__ ((weak, alias("__hallRead")));
+#endif
+

cores/esp32/esp32-hal-adc.h

@@ -0,0 +1,103 @@
+/*
+ Arduino.h - Main include file for the Arduino SDK
+ Copyright (c) 2005-2013 Arduino Team.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef MAIN_ESP32_HAL_ADC_H_
+#define MAIN_ESP32_HAL_ADC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "esp32-hal.h"
+
+typedef enum {
+    ADC_0db,
+    ADC_2_5db,
+    ADC_6db,
+    ADC_11db
+} adc_attenuation_t;
+
+/*
+ * Get ADC value for pin
+ * */
+uint16_t analogRead(uint8_t pin);
+
+/*
+ * Get MilliVolts value for pin
+ * */
+uint32_t analogReadMilliVolts(uint8_t pin);
+
+/*
+ * Set the resolution of analogRead return values. Default is 12 bits (range from 0 to 4096).
+ * If between 9 and 12, it will equal the set hardware resolution, else value will be shifted.
+ * Range is 1 - 16
+ *
+ * Note: compatibility with Arduino SAM
+ */
+void analogReadResolution(uint8_t bits);
+
+/*
+ * Set the divider for the ADC clock.
+ * Default is 1
+ * Range is 1 - 255
+ * */
+void analogSetClockDiv(uint8_t clockDiv);
+
+/*
+ * Set the attenuation for all channels
+ * Default is 11db
+ * */
+void analogSetAttenuation(adc_attenuation_t attenuation);
+
+/*
+ * Set the attenuation for particular pin
+ * Default is 11db
+ * */
+void analogSetPinAttenuation(uint8_t pin, adc_attenuation_t attenuation);
+
+/*
+ * Attach pin to ADC (will also clear any other analog mode that could be on)
+ * */
+bool adcAttachPin(uint8_t pin);
+
+#if CONFIG_IDF_TARGET_ESP32
+/*
+ * Sets the sample bits and read resolution
+ * Default is 12bit (0 - 4095)
+ * Range is 9 - 12
+ * */
+void analogSetWidth(uint8_t bits);
+
+/*
+ * Set pin to use for ADC calibration if the esp is not already calibrated (25, 26 or 27)
+ * */
+void analogSetVRefPin(uint8_t pin);
+
+/*
+ * Get value for HALL sensor (without LNA)
+ * connected to pins 36(SVP) and 39(SVN)
+ * */
+int hallRead();
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_ADC_H_ */

cores/esp32/esp32-hal-bt.c

@@ -0,0 +1,99 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal-bt.h"
+
+#ifdef CONFIG_BT_ENABLED
+
+bool btInUse(){ return true; }
+
+#ifdef CONFIG_BLUEDROID_ENABLED
+#include "esp_bt.h"
+
+#ifdef CONFIG_CLASSIC_BT_ENABLED
+#define BT_MODE ESP_BT_MODE_BTDM
+#else
+#define BT_MODE ESP_BT_MODE_BLE
+#endif
+
+bool btStarted(){
+    return (esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED);
+}
+
+bool btStart(){
+    esp_bt_controller_config_t cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
+    if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED){
+        return true;
+    }
+    if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_IDLE){
+        esp_bt_controller_init(&cfg);
+        while(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_IDLE){}
+    }
+    if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_INITED){
+        if (esp_bt_controller_enable(BT_MODE)) {
+            log_e("BT Enable failed");
+            return false;
+        }
+    }
+    if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED){
+        return true;
+    }
+    log_e("BT Start failed");
+    return false;
+}
+
+bool btStop(){
+    if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_IDLE){
+        return true;
+    }
+    if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED){
+        if (esp_bt_controller_disable()) {
+            log_e("BT Disable failed");
+            return false;
+        }
+        while(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED);
+    }
+    if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_INITED){
+        if (esp_bt_controller_deinit()) {
+			log_e("BT deint failed");
+			return false;
+		}
+		vTaskDelay(1);
+		if (esp_bt_controller_get_status() != ESP_BT_CONTROLLER_STATUS_IDLE) {			
+			return false;		
+		}
+        return true;
+    }
+    log_e("BT Stop failed");
+    return false;
+}
+
+#else
+bool btStarted()
+{
+    return false;
+}
+
+bool btStart()
+{
+    return false;
+}
+
+bool btStop()
+{
+    return false;
+}
+#endif
+#endif
+

cores/esp32/esp32-hal-bt.h

@@ -0,0 +1,32 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32_ESP32_HAL_BT_H_
+#define _ESP32_ESP32_HAL_BT_H_
+
+#include "esp32-hal.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool btStarted();
+bool btStart();
+bool btStop();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP32_ESP32_HAL_BT_H_ */

cores/esp32/esp32-hal-cpu.c

@@ -0,0 +1,245 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "sdkconfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+#include "freertos/task.h"
+#include "freertos/xtensa_timer.h"
+#include "esp_attr.h"
+#include "esp_log.h"
+#include "soc/rtc.h"
+#include "soc/rtc_cntl_reg.h"
+#include "soc/apb_ctrl_reg.h"
+#include "soc/efuse_reg.h"
+#include "esp32-hal.h"
+#include "esp32-hal-cpu.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/rtc.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/rtc.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/rtc.h"
+#endif
+
+typedef struct apb_change_cb_s {
+        struct apb_change_cb_s * prev;
+        struct apb_change_cb_s * next;
+        void * arg;
+        apb_change_cb_t cb;
+} apb_change_t;
+
+
+static apb_change_t * apb_change_callbacks = NULL;
+static xSemaphoreHandle apb_change_lock = NULL;
+
+static void initApbChangeCallback(){
+    static volatile bool initialized = false;
+    if(!initialized){
+        initialized = true;
+        apb_change_lock = xSemaphoreCreateMutex();
+        if(!apb_change_lock){
+            initialized = false;
+        }
+    }
+}
+
+static void triggerApbChangeCallback(apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    initApbChangeCallback();
+    xSemaphoreTake(apb_change_lock, portMAX_DELAY);
+    apb_change_t * r = apb_change_callbacks;
+    if( r != NULL ){
+        if(ev_type == APB_BEFORE_CHANGE )
+            while(r != NULL){
+                r->cb(r->arg, ev_type, old_apb, new_apb);
+                r=r->next;
+            }
+        else { // run backwards through chain
+            while(r->next != NULL) r = r->next; // find first added
+            while( r != NULL){
+                r->cb(r->arg, ev_type, old_apb, new_apb);
+                r=r->prev;
+            }
+        }
+    }
+    xSemaphoreGive(apb_change_lock);
+}
+
+bool addApbChangeCallback(void * arg, apb_change_cb_t cb){
+    initApbChangeCallback();
+    apb_change_t * c = (apb_change_t*)malloc(sizeof(apb_change_t));
+    if(!c){
+        log_e("Callback Object Malloc Failed");
+        return false;
+    }
+    c->next = NULL;
+    c->prev = NULL;
+    c->arg = arg;
+    c->cb = cb;
+    xSemaphoreTake(apb_change_lock, portMAX_DELAY);
+    if(apb_change_callbacks == NULL){
+        apb_change_callbacks = c;
+    } else {
+        apb_change_t * r = apb_change_callbacks;
+        // look for duplicate callbacks
+        while( (r != NULL ) && !((r->cb == cb) && ( r->arg == arg))) r = r->next;
+        if (r) {
+            log_e("duplicate func=%08X arg=%08X",c->cb,c->arg);
+            free(c);
+            xSemaphoreGive(apb_change_lock);
+            return false;
+        }
+        else {
+            c->next = apb_change_callbacks;
+            apb_change_callbacks-> prev = c;
+            apb_change_callbacks = c;
+        }
+    }
+    xSemaphoreGive(apb_change_lock);
+    return true;
+}
+
+bool removeApbChangeCallback(void * arg, apb_change_cb_t cb){
+    initApbChangeCallback();
+    xSemaphoreTake(apb_change_lock, portMAX_DELAY);
+    apb_change_t * r = apb_change_callbacks;
+    // look for matching callback
+    while( (r != NULL ) && !((r->cb == cb) && ( r->arg == arg))) r = r->next;
+    if ( r == NULL ) {
+        log_e("not found func=%08X arg=%08X",cb,arg);
+        xSemaphoreGive(apb_change_lock);
+        return false;
+        }
+    else {
+        // patch links
+        if(r->prev) r->prev->next = r->next;
+        else { // this is first link
+           apb_change_callbacks = r->next;
+        }
+        if(r->next) r->next->prev = r->prev;
+        free(r);
+    }
+    xSemaphoreGive(apb_change_lock);
+    return true;
+}
+
+static uint32_t calculateApb(rtc_cpu_freq_config_t * conf){
+    if(conf->freq_mhz >= 80){
+        return 80 * MHZ;
+    }
+    return (conf->source_freq_mhz * MHZ) / conf->div;
+}
+
+void esp_timer_impl_update_apb_freq(uint32_t apb_ticks_per_us); //private in IDF
+
+bool setCpuFrequencyMhz(uint32_t cpu_freq_mhz){
+    rtc_cpu_freq_config_t conf, cconf;
+    uint32_t capb, apb;
+    //Get XTAL Frequency and calculate min CPU MHz
+    rtc_xtal_freq_t xtal = rtc_clk_xtal_freq_get();
+#if CONFIG_IDF_TARGET_ESP32
+    if(xtal > RTC_XTAL_FREQ_AUTO){
+        if(xtal < RTC_XTAL_FREQ_40M) {
+            if(cpu_freq_mhz <= xtal && cpu_freq_mhz != xtal && cpu_freq_mhz != (xtal/2)){
+                log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2);
+                return false;
+            }
+        } else if(cpu_freq_mhz <= xtal && cpu_freq_mhz != xtal && cpu_freq_mhz != (xtal/2) && cpu_freq_mhz != (xtal/4)){
+            log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2, xtal/4);
+            return false;
+        }
+    }
+#endif
+    if(cpu_freq_mhz > xtal && cpu_freq_mhz != 240 && cpu_freq_mhz != 160 && cpu_freq_mhz != 80){
+        if(xtal >= RTC_XTAL_FREQ_40M){
+            log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2, xtal/4);
+        } else {
+            log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2);
+        }
+        return false;
+    }
+#if CONFIG_IDF_TARGET_ESP32
+    //check if cpu supports the frequency
+    if(cpu_freq_mhz == 240){
+        //Check if ESP32 is rated for a CPU frequency of 160MHz only
+        if (REG_GET_BIT(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_CPU_FREQ_RATED) &&
+            REG_GET_BIT(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_CPU_FREQ_LOW)) {
+            log_e("Can not switch to 240 MHz! Chip CPU frequency rated for 160MHz.");
+            cpu_freq_mhz = 160;
+        }
+    }
+#endif
+    //Get current CPU clock configuration
+    rtc_clk_cpu_freq_get_config(&cconf);
+    //return if frequency has not changed
+    if(cconf.freq_mhz == cpu_freq_mhz){
+        return true;
+    }
+    //Get configuration for the new CPU frequency
+    if(!rtc_clk_cpu_freq_mhz_to_config(cpu_freq_mhz, &conf)){
+        log_e("CPU clock could not be set to %u MHz", cpu_freq_mhz);
+        return false;
+    }
+    //Current APB
+    capb = calculateApb(&cconf);
+    //New APB
+    apb = calculateApb(&conf);
+    log_d("%s: %u / %u = %u Mhz, APB: %u Hz", (conf.source == RTC_CPU_FREQ_SRC_PLL)?"PLL":((conf.source == RTC_CPU_FREQ_SRC_APLL)?"APLL":((conf.source == RTC_CPU_FREQ_SRC_XTAL)?"XTAL":"8M")), conf.source_freq_mhz, conf.div, conf.freq_mhz, apb);
+    //Call peripheral functions before the APB change
+    if(apb_change_callbacks){
+        triggerApbChangeCallback(APB_BEFORE_CHANGE, capb, apb);
+    }
+    //Make the frequency change
+    rtc_clk_cpu_freq_set_config_fast(&conf);
+    if(capb != apb){
+        //Update REF_TICK (uncomment if REF_TICK is different than 1MHz)
+        //if(conf.freq_mhz < 80){
+        //    ESP_REG(APB_CTRL_XTAL_TICK_CONF_REG) = conf.freq_mhz / (REF_CLK_FREQ / MHZ) - 1;
+        // }
+        //Update APB Freq REG
+        rtc_clk_apb_freq_update(apb);
+        //Update esp_timer divisor
+        esp_timer_impl_update_apb_freq(apb / MHZ);
+    }
+    //Update FreeRTOS Tick Divisor
+    uint32_t fcpu = (conf.freq_mhz >= 80)?(conf.freq_mhz * MHZ):(apb);
+    _xt_tick_divisor = fcpu / XT_TICK_PER_SEC;
+    //Call peripheral functions after the APB change
+    if(apb_change_callbacks){
+        triggerApbChangeCallback(APB_AFTER_CHANGE, capb, apb);
+    }
+    return true;
+}
+
+uint32_t getCpuFrequencyMhz(){
+    rtc_cpu_freq_config_t conf;
+    rtc_clk_cpu_freq_get_config(&conf);
+    return conf.freq_mhz;
+}
+
+uint32_t getXtalFrequencyMhz(){
+    return rtc_clk_xtal_freq_get();
+}
+
+uint32_t getApbFrequency(){
+    rtc_cpu_freq_config_t conf;
+    rtc_clk_cpu_freq_get_config(&conf);
+    return calculateApb(&conf);
+}

cores/esp32/esp32-hal-cpu.h

@@ -0,0 +1,48 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32_HAL_CPU_H_
+#define _ESP32_HAL_CPU_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+typedef enum { APB_BEFORE_CHANGE, APB_AFTER_CHANGE } apb_change_ev_t;
+
+typedef void (* apb_change_cb_t)(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb);
+
+bool addApbChangeCallback(void * arg, apb_change_cb_t cb);
+bool removeApbChangeCallback(void * arg, apb_change_cb_t cb);
+
+//function takes the following frequencies as valid values:
+//  240, 160, 80    <<< For all XTAL types
+//  40, 20, 10      <<< For 40MHz XTAL
+//  26, 13          <<< For 26MHz XTAL
+//  24, 12          <<< For 24MHz XTAL
+bool setCpuFrequencyMhz(uint32_t cpu_freq_mhz);
+
+uint32_t getCpuFrequencyMhz();  // In MHz
+uint32_t getXtalFrequencyMhz(); // In MHz
+uint32_t getApbFrequency();     // In Hz
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP32_HAL_CPU_H_ */

cores/esp32/esp32-hal-dac.c

@@ -0,0 +1,56 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal.h"
+#include "esp_attr.h"
+#include "soc/rtc_io_reg.h"
+#include "soc/rtc_cntl_reg.h"
+#include "soc/rtc_io_periph.h"
+#include "soc/sens_reg.h"
+#include "soc/sens_struct.h"
+#include "driver/dac.h"
+
+#if CONFIG_IDF_TARGET_ESP32
+#define DAC1 25
+#define DAC2 26
+#elif CONFIG_IDF_TARGET_ESP32S2
+#define DAC1 17
+#define DAC2 18
+#else
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+
+void ARDUINO_ISR_ATTR __dacWrite(uint8_t pin, uint8_t value)
+{
+    if(pin < DAC1 || pin > DAC2){
+        return;//not dac pin
+    }
+    pinMode(pin, ANALOG);
+    uint8_t channel = pin - DAC1;
+#if CONFIG_IDF_TARGET_ESP32
+    CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL1_REG, SENS_SW_TONE_EN);
+#elif CONFIG_IDF_TARGET_ESP32S2
+    SENS.sar_dac_ctrl1.dac_clkgate_en = 1;
+#endif
+    RTCIO.pad_dac[channel].dac_xpd_force = 1;
+    RTCIO.pad_dac[channel].xpd_dac = 1;
+    if (channel == 0) {
+        SENS.sar_dac_ctrl2.dac_cw_en1 = 0;
+    } else if (channel == 1) {
+        SENS.sar_dac_ctrl2.dac_cw_en2 = 0;
+    }
+    RTCIO.pad_dac[channel].dac = value;
+}
+
+extern void dacWrite(uint8_t pin, uint8_t value) __attribute__ ((weak, alias("__dacWrite")));

cores/esp32/esp32-hal-dac.h

@@ -0,0 +1,36 @@
+/*
+ Arduino.h - Main include file for the Arduino SDK
+ Copyright (c) 2005-2013 Arduino Team.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef MAIN_ESP32_HAL_DAC_H_
+#define MAIN_ESP32_HAL_DAC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "esp32-hal.h"
+#include "driver/gpio.h"
+
+void dacWrite(uint8_t pin, uint8_t value);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_DAC_H_ */

cores/esp32/esp32-hal-gpio.c

@@ -0,0 +1,390 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal-gpio.h"
+#include "pins_arduino.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_attr.h"
+#include "soc/gpio_reg.h"
+#include "soc/io_mux_reg.h"
+#include "soc/gpio_struct.h"
+#include "soc/rtc_io_reg.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/ets_sys.h"
+#include "esp32/rom/gpio.h"
+#include "esp_intr_alloc.h"
+#define GPIO_FUNC 2
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/ets_sys.h"
+#include "esp32s2/rom/gpio.h"
+#include "esp_intr_alloc.h"
+#include "soc/periph_defs.h"
+#define GPIO_FUNC 1
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/ets_sys.h"
+#include "rom/gpio.h"
+#include "esp_intr.h"
+#endif
+
+#if CONFIG_IDF_TARGET_ESP32
+const int8_t esp32_adc2gpio[20] = {36, 37, 38, 39, 32, 33, 34, 35, -1, -1, 4, 0, 2, 15, 13, 12, 14, 27, 25, 26};
+#elif CONFIG_IDF_TARGET_ESP32S2
+const int8_t esp32_adc2gpio[20] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20};
+#endif
+
+const DRAM_ATTR esp32_gpioMux_t esp32_gpioMux[SOC_GPIO_PIN_COUNT]={
+#if CONFIG_IDF_TARGET_ESP32
+    {0x44, 11, 11, 1},
+    {0x88, -1, -1, -1},
+    {0x40, 12, 12, 2},
+    {0x84, -1, -1, -1},
+    {0x48, 10, 10, 0},
+    {0x6c, -1, -1, -1},
+    {0x60, -1, -1, -1},
+    {0x64, -1, -1, -1},
+    {0x68, -1, -1, -1},
+    {0x54, -1, -1, -1},
+    {0x58, -1, -1, -1},
+    {0x5c, -1, -1, -1},
+    {0x34, 15, 15, 5},
+    {0x38, 14, 14, 4},
+    {0x30, 16, 16, 6},
+    {0x3c, 13, 13, 3},
+    {0x4c, -1, -1, -1},
+    {0x50, -1, -1, -1},
+    {0x70, -1, -1, -1},
+    {0x74, -1, -1, -1},
+    {0x78, -1, -1, -1},
+    {0x7c, -1, -1, -1},
+    {0x80, -1, -1, -1},
+    {0x8c, -1, -1, -1},
+    {0, -1, -1, -1},
+    {0x24, 6, 18, -1}, //DAC1
+    {0x28, 7, 19, -1}, //DAC2
+    {0x2c, 17, 17, 7},
+    {0, -1, -1, -1},
+    {0, -1, -1, -1},
+    {0, -1, -1, -1},
+    {0, -1, -1, -1},
+    {0x1c, 9, 4, 8},
+    {0x20, 8, 5, 9},
+    {0x14, 4, 6, -1},
+    {0x18, 5, 7, -1},
+    {0x04, 0, 0, -1},
+    {0x08, 1, 1, -1},
+    {0x0c, 2, 2, -1},
+    {0x10, 3, 3, -1}
+#elif CONFIG_IDF_TARGET_ESP32S2
+    {0x04,  0, -1, -1},
+    {0x08,  1,  0,  1},
+    {0x0c,  2,  1,  2},
+    {0x10,  3,  2,  3},
+    {0x14,  4,  3,  4},
+    {0x18,  5,  4,  5},
+    {0x1c,  6,  5,  6},
+    {0x20,  7,  6,  7},
+    {0x24,  8,  7,  8},
+    {0x28,  9,  8,  9},//FSPI_HD
+    {0x2c, 10,  9, 10},//FSPI_CS0 / FSPI_D4
+    {0x30, 11, 10, 11},//FSPI_D / FSPI_D5
+    {0x34, 12, 11, 12},//FSPI_CLK / FSPI_D6
+    {0x38, 13, 12, 13},//FSPI_Q / FSPI_D7
+    {0x3c, 14, 13, 14},//FSPI_WP / FSPI_DQS
+    {0x40, 15, 14, -1},//32K+ / RTS0
+    {0x44, 16, 15, -1},//32K- / CTS0
+    {0x48, 17, 16, -1},//DAC1 / TXD1
+    {0x4c, 18, 17, -1},//DAC2 / RXD1
+    {0x50, 19, 18, -1},//USB D- / RTS1
+    {0x54, 20, 19, -1},//USB D+ / CTS1
+    {0x58, 21, -1, -1},//SDA?
+    {   0, -1, -1, -1},//UNAVAILABLE
+    {   0, -1, -1, -1},//UNAVAILABLE
+    {   0, -1, -1, -1},//UNAVAILABLE
+    {   0, -1, -1, -1},//UNAVAILABLE
+    {0x6c, -1, -1, -1},//RESERVED SPI_CS1
+    {0x70, -1, -1, -1},//RESERVED SPI_HD
+    {0x74, -1, -1, -1},//RESERVED SPI_WP
+    {0x78, -1, -1, -1},//RESERVED SPI_CS0
+    {0x7c, -1, -1, -1},//RESERVED SPI_CLK
+    {0x80, -1, -1, -1},//RESERVED SPI_Q
+    {0x84, -1, -1, -1},//RESERVED SPI_D
+    {0x88, -1, -1, -1},//FSPI_HD
+    {0x8c, -1, -1, -1},//FSPI_CS0
+    {0x90, -1, -1, -1},//FSPI_D
+    {0x94, -1, -1, -1},//FSPI_CLK
+    {0x98, -1, -1, -1},//FSPI_Q
+    {0x9c, -1, -1, -1},//FSPI_WP
+    {0xa0, -1, -1, -1},//MTCK
+    {0xa4, -1, -1, -1},//MTDO
+    {0xa8, -1, -1, -1},//MTDI
+    {0xac, -1, -1, -1},//MTMS
+    {0xb0, -1, -1, -1},//TXD0
+    {0xb4, -1, -1, -1},//RXD0
+    {0xb8, -1, -1, -1},//SCL?
+    {0xbc, -1, -1, -1},//INPUT ONLY
+    {0, -1, -1, -1}
+#endif
+};
+
+typedef void (*voidFuncPtr)(void);
+typedef void (*voidFuncPtrArg)(void*);
+typedef struct {
+    voidFuncPtr fn;
+    void* arg;
+    bool functional;
+} InterruptHandle_t;
+static InterruptHandle_t __pinInterruptHandlers[SOC_GPIO_PIN_COUNT] = {0,};
+
+#include "driver/rtc_io.h"
+
+extern void ARDUINO_ISR_ATTR __pinMode(uint8_t pin, uint8_t mode)
+{
+
+    if(!digitalPinIsValid(pin)) {
+        return;
+    }
+
+    int8_t rtc_io = esp32_gpioMux[pin].rtc;
+    uint32_t rtc_reg = (rtc_io != -1)?rtc_io_desc[rtc_io].reg:0;
+    if(mode == ANALOG) {
+        if(!rtc_reg) {
+            return;//not rtc pin
+        }
+#if CONFIG_IDF_TARGET_ESP32S2
+        SENS.sar_io_mux_conf.iomux_clk_gate_en = 1;
+#endif
+        SET_PERI_REG_MASK(rtc_io_desc[rtc_io].reg, (rtc_io_desc[rtc_io].mux));
+        SET_PERI_REG_BITS(rtc_io_desc[rtc_io].reg, RTC_IO_TOUCH_PAD1_FUN_SEL_V, 0, rtc_io_desc[rtc_io].func);
+
+        RTCIO.pin[rtc_io].pad_driver = 0;//OD = 1
+        RTCIO.enable_w1tc.w1tc = (1U << rtc_io);
+        CLEAR_PERI_REG_MASK(rtc_io_desc[rtc_io].reg, rtc_io_desc[rtc_io].ie);
+
+        if (rtc_io_desc[rtc_io].pullup) {
+            CLEAR_PERI_REG_MASK(rtc_io_desc[rtc_io].reg, rtc_io_desc[rtc_io].pullup);
+        }
+        if (rtc_io_desc[rtc_io].pulldown) {
+            CLEAR_PERI_REG_MASK(rtc_io_desc[rtc_io].reg, rtc_io_desc[rtc_io].pulldown);
+        }
+        ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = ((uint32_t)GPIO_FUNC << MCU_SEL_S) | ((uint32_t)2 << FUN_DRV_S) | FUN_IE;
+        return;
+    }
+
+    //RTC pins PULL settings
+    if(rtc_reg) {
+        ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_io_desc[rtc_io].mux);
+        if(mode & PULLUP) {
+            ESP_REG(rtc_reg) = (ESP_REG(rtc_reg) | rtc_io_desc[rtc_io].pullup) & ~(rtc_io_desc[rtc_io].pulldown);
+        } else if(mode & PULLDOWN) {
+            ESP_REG(rtc_reg) = (ESP_REG(rtc_reg) | rtc_io_desc[rtc_io].pulldown) & ~(rtc_io_desc[rtc_io].pullup);
+        } else {
+            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_io_desc[rtc_io].pullup | rtc_io_desc[rtc_io].pulldown);
+        }
+    }
+
+    uint32_t pinFunction = 0, pinControl = 0;
+
+    if(mode & INPUT) {
+        if(pin < 32) {
+            GPIO.enable_w1tc = ((uint32_t)1 << pin);
+        } else {
+            GPIO.enable1_w1tc.val = ((uint32_t)1 << (pin - 32));
+        }
+    } else if(mode & OUTPUT) {
+        if(pin >= NUM_OUPUT_PINS){
+            return;
+        } else if(pin < 32) {
+            GPIO.enable_w1ts = ((uint32_t)1 << pin);
+        } else {
+            GPIO.enable1_w1ts.val = ((uint32_t)1 << (pin - 32));
+        }
+    }
+
+    if(mode & PULLUP) {
+        pinFunction |= FUN_PU;
+    } else if(mode & PULLDOWN) {
+        pinFunction |= FUN_PD;
+    }
+
+    pinFunction |= ((uint32_t)2 << FUN_DRV_S);//what are the drivers?
+    pinFunction |= FUN_IE;//input enable but required for output as well?
+
+    if(mode & (INPUT | OUTPUT)) {
+#if CONFIG_IDF_TARGET_ESP32
+        pinFunction |= ((uint32_t)2 << MCU_SEL_S);
+#elif CONFIG_IDF_TARGET_ESP32S2
+        pinFunction |= ((uint32_t)1 << MCU_SEL_S);
+#endif
+    } else if(mode == SPECIAL) {
+#if CONFIG_IDF_TARGET_ESP32
+        pinFunction |= ((uint32_t)(((pin)==RX||(pin)==TX)?0:1) << MCU_SEL_S);
+#elif CONFIG_IDF_TARGET_ESP32S2
+        pinFunction |= ((uint32_t)(((pin)==RX||(pin)==TX)?0:2) << MCU_SEL_S);
+#endif
+    } else {
+        pinFunction |= ((uint32_t)(mode >> 5) << MCU_SEL_S);
+    }
+
+    ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = pinFunction;
+
+    if(mode & OPEN_DRAIN) {
+        pinControl = (1 << GPIO_PIN0_PAD_DRIVER_S);
+    }
+
+    GPIO.pin[pin].val = pinControl;
+}
+
+extern void ARDUINO_ISR_ATTR __digitalWrite(uint8_t pin, uint8_t val)
+{
+    if(val) {
+        if(pin < 32) {
+            GPIO.out_w1ts = ((uint32_t)1 << pin);
+        } else if(pin < NUM_OUPUT_PINS) {
+            GPIO.out1_w1ts.val = ((uint32_t)1 << (pin - 32));
+        }
+    } else {
+        if(pin < 32) {
+            GPIO.out_w1tc = ((uint32_t)1 << pin);
+        } else if(pin < NUM_OUPUT_PINS) {
+            GPIO.out1_w1tc.val = ((uint32_t)1 << (pin - 32));
+        }
+    }
+}
+
+extern int ARDUINO_ISR_ATTR __digitalRead(uint8_t pin)
+{
+    if(pin < 32) {
+        return (GPIO.in >> pin) & 0x1;
+    } else if(pin < GPIO_PIN_COUNT) {
+        return (GPIO.in1.val >> (pin - 32)) & 0x1;
+    }
+    return 0;
+}
+
+static intr_handle_t gpio_intr_handle = NULL;
+
+static void ARDUINO_ISR_ATTR __onPinInterrupt()
+{
+    uint32_t gpio_intr_status_l=0;
+    uint32_t gpio_intr_status_h=0;
+
+    gpio_intr_status_l = GPIO.status;
+    gpio_intr_status_h = GPIO.status1.val;
+    GPIO.status_w1tc = gpio_intr_status_l;//Clear intr for gpio0-gpio31
+    GPIO.status1_w1tc.val = gpio_intr_status_h;//Clear intr for gpio32-39
+
+    uint8_t pin=0;
+    if(gpio_intr_status_l) {
+        do {
+            if(gpio_intr_status_l & ((uint32_t)1 << pin)) {
+                if(__pinInterruptHandlers[pin].fn) {
+                    if(__pinInterruptHandlers[pin].arg){
+                        ((voidFuncPtrArg)__pinInterruptHandlers[pin].fn)(__pinInterruptHandlers[pin].arg);
+                    } else {
+                        __pinInterruptHandlers[pin].fn();
+                    }
+                }
+            }
+        } while(++pin<32);
+    }
+    if(gpio_intr_status_h) {
+        pin=32;
+        do {
+            if(gpio_intr_status_h & ((uint32_t)1 << (pin - 32))) {
+                if(__pinInterruptHandlers[pin].fn) {
+                    if(__pinInterruptHandlers[pin].arg){
+                        ((voidFuncPtrArg)__pinInterruptHandlers[pin].fn)(__pinInterruptHandlers[pin].arg);
+                    } else {
+                        __pinInterruptHandlers[pin].fn();
+                    }
+                }
+            }
+        } while(++pin<GPIO_PIN_COUNT);
+    }
+}
+
+extern void cleanupFunctional(void* arg);
+
+extern void __attachInterruptFunctionalArg(uint8_t pin, voidFuncPtrArg userFunc, void * arg, int intr_type, bool functional)
+{
+    static bool interrupt_initialized = false;
+
+    if(!interrupt_initialized) {
+        interrupt_initialized = true;
+        esp_intr_alloc(ETS_GPIO_INTR_SOURCE, (int)ARDUINO_ISR_FLAG, __onPinInterrupt, NULL, &gpio_intr_handle);
+    }
+
+    // if new attach without detach remove old info
+    if (__pinInterruptHandlers[pin].functional && __pinInterruptHandlers[pin].arg)
+    {
+    	cleanupFunctional(__pinInterruptHandlers[pin].arg);
+    }
+    __pinInterruptHandlers[pin].fn = (voidFuncPtr)userFunc;
+    __pinInterruptHandlers[pin].arg = arg;
+    __pinInterruptHandlers[pin].functional = functional;
+
+    esp_intr_disable(gpio_intr_handle);
+#if CONFIG_IDF_TARGET_ESP32
+    if(esp_intr_get_cpu(gpio_intr_handle)) { //APP_CPU
+#endif
+        GPIO.pin[pin].int_ena = 1;
+#if CONFIG_IDF_TARGET_ESP32
+    } else { //PRO_CPU
+        GPIO.pin[pin].int_ena = 4;
+    }
+#endif
+    GPIO.pin[pin].int_type = intr_type;
+    esp_intr_enable(gpio_intr_handle);
+}
+
+extern void __attachInterruptArg(uint8_t pin, voidFuncPtrArg userFunc, void * arg, int intr_type)
+{
+	__attachInterruptFunctionalArg(pin, userFunc, arg, intr_type, false);
+}
+
+extern void __attachInterrupt(uint8_t pin, voidFuncPtr userFunc, int intr_type) {
+    __attachInterruptFunctionalArg(pin, (voidFuncPtrArg)userFunc, NULL, intr_type, false);
+}
+
+extern void __detachInterrupt(uint8_t pin)
+{
+    esp_intr_disable(gpio_intr_handle);
+    if (__pinInterruptHandlers[pin].functional && __pinInterruptHandlers[pin].arg)
+    {
+    	cleanupFunctional(__pinInterruptHandlers[pin].arg);
+    }
+    __pinInterruptHandlers[pin].fn = NULL;
+    __pinInterruptHandlers[pin].arg = NULL;
+    __pinInterruptHandlers[pin].functional = false;
+
+    GPIO.pin[pin].int_ena = 0;
+    GPIO.pin[pin].int_type = 0;
+    esp_intr_enable(gpio_intr_handle);
+}
+
+
+extern void pinMode(uint8_t pin, uint8_t mode) __attribute__ ((weak, alias("__pinMode")));
+extern void digitalWrite(uint8_t pin, uint8_t val) __attribute__ ((weak, alias("__digitalWrite")));
+extern int digitalRead(uint8_t pin) __attribute__ ((weak, alias("__digitalRead")));
+extern void attachInterrupt(uint8_t pin, voidFuncPtr handler, int mode) __attribute__ ((weak, alias("__attachInterrupt")));
+extern void attachInterruptArg(uint8_t pin, voidFuncPtrArg handler, void * arg, int mode) __attribute__ ((weak, alias("__attachInterruptArg")));
+extern void detachInterrupt(uint8_t pin) __attribute__ ((weak, alias("__detachInterrupt")));
+

cores/esp32/esp32-hal-gpio.h

@@ -0,0 +1,100 @@
+/*
+ Arduino.h - Main include file for the Arduino SDK
+ Copyright (c) 2005-2013 Arduino Team.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef MAIN_ESP32_HAL_GPIO_H_
+#define MAIN_ESP32_HAL_GPIO_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "esp32-hal.h"
+#include "soc/soc_caps.h"
+
+#if (CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3)
+#define NUM_OUPUT_PINS  45
+#define PIN_DAC1        17
+#define PIN_DAC2        18
+#else
+#define NUM_OUPUT_PINS  34
+#define PIN_DAC1        25
+#define PIN_DAC2        26
+#endif
+
+#define LOW               0x0
+#define HIGH              0x1
+
+//GPIO FUNCTIONS
+#define INPUT             0x01
+#define OUTPUT            0x02
+#define PULLUP            0x04
+#define INPUT_PULLUP      0x05
+#define PULLDOWN          0x08
+#define INPUT_PULLDOWN    0x09
+#define OPEN_DRAIN        0x10
+#define OUTPUT_OPEN_DRAIN 0x12
+#define SPECIAL           0xF0
+#define FUNCTION_1        0x00
+#define FUNCTION_2        0x20
+#define FUNCTION_3        0x40
+#define FUNCTION_4        0x60
+#define FUNCTION_5        0x80
+#define FUNCTION_6        0xA0
+#define ANALOG            0xC0
+
+//Interrupt Modes
+#define DISABLED  0x00
+#define RISING    0x01
+#define FALLING   0x02
+#define CHANGE    0x03
+#define ONLOW     0x04
+#define ONHIGH    0x05
+#define ONLOW_WE  0x0C
+#define ONHIGH_WE 0x0D
+
+typedef struct {
+    uint8_t reg;      /*!< GPIO register offset from DR_REG_IO_MUX_BASE */
+    int8_t rtc;       /*!< RTC GPIO number (-1 if not RTC GPIO pin) */
+    int8_t adc;       /*!< ADC Channel number (-1 if not ADC pin) */
+    int8_t touch;     /*!< Touch Channel number (-1 if not Touch pin) */
+} esp32_gpioMux_t;
+
+extern const esp32_gpioMux_t esp32_gpioMux[SOC_GPIO_PIN_COUNT];
+extern const int8_t esp32_adc2gpio[20];
+
+#define digitalPinIsValid(pin)          ((pin) < SOC_GPIO_PIN_COUNT && esp32_gpioMux[(pin)].reg)
+#define digitalPinCanOutput(pin)        ((pin) < NUM_OUPUT_PINS && esp32_gpioMux[(pin)].reg)
+#define digitalPinToRtcPin(pin)         (((pin) < SOC_GPIO_PIN_COUNT)?esp32_gpioMux[(pin)].rtc:-1)
+#define digitalPinToAnalogChannel(pin)  (((pin) < SOC_GPIO_PIN_COUNT)?esp32_gpioMux[(pin)].adc:-1)
+#define digitalPinToTouchChannel(pin)   (((pin) < SOC_GPIO_PIN_COUNT)?esp32_gpioMux[(pin)].touch:-1)
+#define digitalPinToDacChannel(pin)     (((pin) == PIN_DAC1)?0:((pin) == PIN_DAC2)?1:-1)
+
+void pinMode(uint8_t pin, uint8_t mode);
+void digitalWrite(uint8_t pin, uint8_t val);
+int digitalRead(uint8_t pin);
+
+void attachInterrupt(uint8_t pin, void (*)(void), int mode);
+void attachInterruptArg(uint8_t pin, void (*)(void*), void * arg, int mode);
+void detachInterrupt(uint8_t pin);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_GPIO_H_ */

cores/esp32/esp32-hal-i2c.h

@@ -0,0 +1,82 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// modified Nov 2017 by Chuck Todd <StickBreaker> to support Interrupt Driven I/O
+
+#ifndef _ESP32_HAL_I2C_H_
+#define _ESP32_HAL_I2C_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+
+// External Wire.h equivalent error Codes
+typedef enum {
+    I2C_ERROR_OK=0,
+    I2C_ERROR_DEV,
+    I2C_ERROR_ACK,
+    I2C_ERROR_TIMEOUT,
+    I2C_ERROR_BUS,
+    I2C_ERROR_BUSY,
+    I2C_ERROR_MEMORY,
+    I2C_ERROR_CONTINUE,
+    I2C_ERROR_NO_BEGIN
+} i2c_err_t;
+
+struct i2c_struct_t;
+typedef struct i2c_struct_t i2c_t;
+
+i2c_t * i2cInit(uint8_t i2c_num, int8_t sda, int8_t scl, uint32_t clk_speed);
+void i2cRelease(i2c_t *i2c); // free ISR, Free DQ, Power off peripheral clock.  Must call i2cInit() to recover
+i2c_err_t i2cWrite(i2c_t * i2c, uint16_t address, uint8_t* buff, uint16_t size, bool sendStop, uint16_t timeOutMillis);
+i2c_err_t i2cRead(i2c_t * i2c, uint16_t address, uint8_t* buff, uint16_t size, bool sendStop, uint16_t timeOutMillis, uint32_t *readCount);
+i2c_err_t i2cFlush(i2c_t *i2c);
+i2c_err_t i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed);
+uint32_t i2cGetFrequency(i2c_t * i2c);
+uint32_t i2cGetStatus(i2c_t * i2c); // Status register of peripheral
+
+//Functions below should be used only if well understood
+//Might be deprecated and removed in future
+i2c_err_t i2cAttachSCL(i2c_t * i2c, int8_t scl);
+i2c_err_t i2cDetachSCL(i2c_t * i2c, int8_t scl);
+i2c_err_t i2cAttachSDA(i2c_t * i2c, int8_t sda);
+i2c_err_t i2cDetachSDA(i2c_t * i2c, int8_t sda);
+
+//Stickbreakers ISR Support
+i2c_err_t i2cProcQueue(i2c_t *i2c, uint32_t *readCount, uint16_t timeOutMillis);
+i2c_err_t i2cAddQueueWrite(i2c_t *i2c, uint16_t i2cDeviceAddr, uint8_t *dataPtr, uint16_t dataLen, bool SendStop, EventGroupHandle_t event);
+i2c_err_t i2cAddQueueRead(i2c_t *i2c, uint16_t i2cDeviceAddr, uint8_t *dataPtr, uint16_t dataLen, bool SendStop, EventGroupHandle_t event);
+
+//stickbreaker debug support
+uint32_t i2cDebug(i2c_t *, uint32_t setBits, uint32_t resetBits);
+//  Debug actions have 3 currently defined locus 
+// 0xXX------ : at entry of ProcQueue 
+// 0x--XX---- : at exit of ProcQueue
+// 0x------XX : at entry of Flush
+// 
+// bit 0 causes DumpI2c to execute 
+// bit 1 causes DumpInts to execute
+// bit 2 causes DumpCmdqueue to execute
+// bit 3 causes DumpStatus to execute
+// bit 4 causes DumpFifo to execute
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP32_HAL_I2C_H_ */

cores/esp32/esp32-hal-ledc.c

@@ -0,0 +1,315 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/semphr.h"
+#include "esp32-hal-matrix.h"
+#include "soc/dport_reg.h"
+#include "soc/ledc_reg.h"
+#include "soc/ledc_struct.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/ets_sys.h"
+#define LAST_CHAN (15)
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/ets_sys.h"
+#define LAST_CHAN (7)
+#define LEDC_DIV_NUM_HSTIMER0_V LEDC_CLK_DIV_LSTIMER0_V
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/ets_sys.h"
+#endif
+
+#if CONFIG_DISABLE_HAL_LOCKS
+#define LEDC_MUTEX_LOCK()
+#define LEDC_MUTEX_UNLOCK()
+#else
+#define LEDC_MUTEX_LOCK()    do {} while (xSemaphoreTake(_ledc_sys_lock, portMAX_DELAY) != pdPASS)
+#define LEDC_MUTEX_UNLOCK()  xSemaphoreGive(_ledc_sys_lock)
+xSemaphoreHandle _ledc_sys_lock = NULL;
+#endif
+
+/*
+ * LEDC Chan to Group/Channel/Timer Mapping
+** ledc: 0  => Group: 0, Channel: 0, Timer: 0
+** ledc: 1  => Group: 0, Channel: 1, Timer: 0
+** ledc: 2  => Group: 0, Channel: 2, Timer: 1
+** ledc: 3  => Group: 0, Channel: 3, Timer: 1
+** ledc: 4  => Group: 0, Channel: 4, Timer: 2
+** ledc: 5  => Group: 0, Channel: 5, Timer: 2
+** ledc: 6  => Group: 0, Channel: 6, Timer: 3
+** ledc: 7  => Group: 0, Channel: 7, Timer: 3
+** ledc: 8  => Group: 1, Channel: 0, Timer: 0
+** ledc: 9  => Group: 1, Channel: 1, Timer: 0
+** ledc: 10 => Group: 1, Channel: 2, Timer: 1
+** ledc: 11 => Group: 1, Channel: 3, Timer: 1
+** ledc: 12 => Group: 1, Channel: 4, Timer: 2
+** ledc: 13 => Group: 1, Channel: 5, Timer: 2
+** ledc: 14 => Group: 1, Channel: 6, Timer: 3
+** ledc: 15 => Group: 1, Channel: 7, Timer: 3
+*/
+#define LEDC_CHAN(g,c) LEDC.channel_group[(g)].channel[(c)]
+#define LEDC_TIMER(g,t) LEDC.timer_group[(g)].timer[(t)]
+
+static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    if(ev_type == APB_AFTER_CHANGE && old_apb != new_apb){
+        uint16_t iarg = *(uint16_t*)arg;
+        uint8_t chan = 0;
+        old_apb /= 1000000;
+        new_apb /= 1000000;
+        while(iarg){ // run though all active channels, adjusting timing configurations
+            if(iarg & 1) {// this channel is active
+                uint8_t group=(chan/8), timer=((chan/2)%4);
+                if(LEDC_TIMER(group, timer).conf.tick_sel){
+                    LEDC_MUTEX_LOCK();
+                    uint32_t old_div = LEDC_TIMER(group, timer).conf.clock_divider;
+                    uint32_t div_num = (new_apb * old_div) / old_apb;
+                    if(div_num > LEDC_DIV_NUM_HSTIMER0_V){
+                        div_num = ((REF_CLK_FREQ /1000000) * old_div) / old_apb;
+                        if(div_num > LEDC_DIV_NUM_HSTIMER0_V) {
+                            div_num = LEDC_DIV_NUM_HSTIMER0_V;//lowest clock possible
+                        }
+                        LEDC_TIMER(group, timer).conf.tick_sel = 0;
+                    } else if(div_num < 256) {
+                        div_num = 256;//highest clock possible
+                    }
+                    LEDC_TIMER(group, timer).conf.clock_divider = div_num;
+                    LEDC_MUTEX_UNLOCK();
+                }
+                else {
+                    log_d("using REF_CLK chan=%d",chan);
+                }
+            }
+            iarg = iarg >> 1;
+            chan++;
+        }
+    }
+}
+
+//uint32_t frequency = (80MHz or 1MHz)/((div_num / 256.0)*(1 << bit_num));
+static void _ledcSetupTimer(uint8_t chan, uint32_t div_num, uint8_t bit_num, bool apb_clk)
+{
+    uint8_t group=(chan/8), timer=((chan/2)%4);
+    static bool tHasStarted = false;
+    static uint16_t _activeChannels = 0;
+    if(!tHasStarted) {
+        tHasStarted = true;
+        DPORT_SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_LEDC_CLK_EN);
+        DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_LEDC_RST);
+        LEDC.conf.apb_clk_sel = 1;//LS use apb clock
+        addApbChangeCallback((void*)&_activeChannels, _on_apb_change);
+
+#if !CONFIG_DISABLE_HAL_LOCKS
+        _ledc_sys_lock = xSemaphoreCreateMutex();
+#endif
+    }
+    LEDC_MUTEX_LOCK();
+    LEDC_TIMER(group, timer).conf.clock_divider = div_num;//18 bit (10.8) This register is used to configure parameter for divider in timer the least significant eight bits represent the decimal part.
+    LEDC_TIMER(group, timer).conf.duty_resolution = bit_num;//5 bit This register controls the range of the counter in timer. the counter range is [0 2**bit_num] the max bit width for counter is 20.
+    LEDC_TIMER(group, timer).conf.tick_sel = apb_clk;//apb clock
+#if CONFIG_IDF_TARGET_ESP32
+    if(group) {
+#endif
+        LEDC_TIMER(group, timer).conf.low_speed_update = 1;//This bit is only useful for low speed timer channels, reserved for high speed timers
+#if CONFIG_IDF_TARGET_ESP32
+    }
+#endif
+    LEDC_TIMER(group, timer).conf.pause = 0;
+    LEDC_TIMER(group, timer).conf.rst = 1;//This bit is used to reset timer the counter will be 0 after reset.
+    LEDC_TIMER(group, timer).conf.rst = 0;
+    LEDC_MUTEX_UNLOCK();
+    _activeChannels |= (1 << chan); // mark as active for APB callback
+}
+
+//max div_num 0x3FFFF (262143)
+//max bit_num 0x1F (31)
+static double _ledcSetupTimerFreq(uint8_t chan, double freq, uint8_t bit_num)
+{
+    uint64_t clk_freq = getApbFrequency();
+    clk_freq <<= 8;//div_num is 8 bit decimal
+    uint32_t div_num = (clk_freq >> bit_num) / freq;
+    bool apb_clk = true;
+    if(div_num > LEDC_DIV_NUM_HSTIMER0_V) {
+        clk_freq /= 80;
+        div_num = (clk_freq >> bit_num) / freq;
+        if(div_num > LEDC_DIV_NUM_HSTIMER0_V) {
+            div_num = LEDC_DIV_NUM_HSTIMER0_V;//lowest clock possible
+        }
+        apb_clk = false;
+    } else if(div_num < 256) {
+        div_num = 256;//highest clock possible
+    }
+    _ledcSetupTimer(chan, div_num, bit_num, apb_clk);
+    //log_i("Fin: %f, Fclk: %uMhz, bits: %u, DIV: %u, Fout: %f",
+    //        freq, apb_clk?80:1, bit_num, div_num, (clk_freq >> bit_num) / (double)div_num);
+    return (clk_freq >> bit_num) / (double)div_num;
+}
+
+static double _ledcTimerRead(uint8_t chan)
+{
+    uint32_t div_num;
+    uint8_t bit_num;
+    bool apb_clk;
+    uint8_t group=(chan/8), timer=((chan/2)%4);
+    LEDC_MUTEX_LOCK();
+    div_num = LEDC_TIMER(group, timer).conf.clock_divider;//18 bit (10.8) This register is used to configure parameter for divider in timer the least significant eight bits represent the decimal part.
+    bit_num = LEDC_TIMER(group, timer).conf.duty_resolution;//5 bit This register controls the range of the counter in timer. the counter range is [0 2**bit_num] the max bit width for counter is 20.
+    apb_clk = LEDC_TIMER(group, timer).conf.tick_sel;//apb clock
+    LEDC_MUTEX_UNLOCK();
+    uint64_t clk_freq = 1000000;
+    if(apb_clk) {
+        clk_freq = getApbFrequency();
+    }
+    clk_freq <<= 8;//div_num is 8 bit decimal
+    return (clk_freq >> bit_num) / (double)div_num;
+}
+
+static void _ledcSetupChannel(uint8_t chan, uint8_t idle_level)
+{
+    uint8_t group=(chan/8), channel=(chan%8), timer=((chan/2)%4);
+    LEDC_MUTEX_LOCK();
+    LEDC_CHAN(group, channel).conf0.timer_sel = timer;//2 bit Selects the timer to attach 0-3
+    LEDC_CHAN(group, channel).conf0.idle_lv = idle_level;//1 bit This bit is used to control the output value when channel is off.
+    LEDC_CHAN(group, channel).hpoint.hpoint = 0;//20 bit The output value changes to high when timer selected by channel has reached hpoint
+    LEDC_CHAN(group, channel).conf1.duty_inc = 1;//1 bit This register is used to increase the duty of output signal or decrease the duty of output signal for high speed channel
+    LEDC_CHAN(group, channel).conf1.duty_num = 1;//10 bit This register is used to control the number of increased or decreased times for channel
+    LEDC_CHAN(group, channel).conf1.duty_cycle = 1;//10 bit This register is used to increase or decrease the duty every duty_cycle cycles for channel
+    LEDC_CHAN(group, channel).conf1.duty_scale = 0;//10 bit This register controls the increase or decrease step scale for channel.
+    LEDC_CHAN(group, channel).duty.duty = 0;
+    LEDC_CHAN(group, channel).conf0.sig_out_en = 0;//This is the output enable control bit for channel
+    LEDC_CHAN(group, channel).conf1.duty_start = 0;//When duty_num duty_cycle and duty_scale has been configured. these register won't take effect until set duty_start. this bit is automatically cleared by hardware.
+#if CONFIG_IDF_TARGET_ESP32
+    if(group) {
+#endif
+        LEDC_CHAN(group, channel).conf0.low_speed_update = 1;
+#if CONFIG_IDF_TARGET_ESP32
+    } else {
+        LEDC_CHAN(group, channel).conf0.clk_en = 0;
+    }
+#endif
+    LEDC_MUTEX_UNLOCK();
+}
+
+double ledcSetup(uint8_t chan, double freq, uint8_t bit_num)
+{
+    if(chan > LAST_CHAN) {
+        return 0;
+    }
+    double res_freq = _ledcSetupTimerFreq(chan, freq, bit_num);
+    _ledcSetupChannel(chan, LOW);
+    return res_freq;
+}
+
+void ledcWrite(uint8_t chan, uint32_t duty)
+{
+    if(chan > LAST_CHAN) {
+        return;
+    }
+    uint8_t group=(chan/8), channel=(chan%8);
+    LEDC_MUTEX_LOCK();
+    LEDC_CHAN(group, channel).duty.duty = duty << 4;//25 bit (21.4)
+    if(duty) {
+        LEDC_CHAN(group, channel).conf0.sig_out_en = 1;//This is the output enable control bit for channel
+        LEDC_CHAN(group, channel).conf1.duty_start = 1;//When duty_num duty_cycle and duty_scale has been configured. these register won't take effect until set duty_start. this bit is automatically cleared by hardware.
+#if CONFIG_IDF_TARGET_ESP32
+        if(group) {
+#endif
+            LEDC_CHAN(group, channel).conf0.low_speed_update = 1;
+#if CONFIG_IDF_TARGET_ESP32
+        } else {
+            LEDC_CHAN(group, channel).conf0.clk_en = 1;
+        }
+#endif
+    } else {
+        LEDC_CHAN(group, channel).conf0.sig_out_en = 0;//This is the output enable control bit for channel
+        LEDC_CHAN(group, channel).conf1.duty_start = 0;//When duty_num duty_cycle and duty_scale has been configured. these register won't take effect until set duty_start. this bit is automatically cleared by hardware.
+#if CONFIG_IDF_TARGET_ESP32
+        if(group) {
+#endif
+            LEDC_CHAN(group, channel).conf0.low_speed_update = 1;
+#if CONFIG_IDF_TARGET_ESP32
+        } else {
+            LEDC_CHAN(group, channel).conf0.clk_en = 0;
+        }
+#endif
+    }
+    LEDC_MUTEX_UNLOCK();
+}
+
+uint32_t ledcRead(uint8_t chan)
+{
+    if(chan > LAST_CHAN) {
+        return 0;
+    }
+    return LEDC.channel_group[chan/8].channel[chan%8].duty.duty >> 4;
+}
+
+double ledcReadFreq(uint8_t chan)
+{
+    if(!ledcRead(chan)){
+        return 0;
+    }
+    return _ledcTimerRead(chan);
+}
+
+double ledcWriteTone(uint8_t chan, double freq)
+{
+    if(chan > LAST_CHAN) {
+        return 0;
+    }
+    if(!freq) {
+        ledcWrite(chan, 0);
+        return 0;
+    }
+    double res_freq = _ledcSetupTimerFreq(chan, freq, 10);
+    ledcWrite(chan, 0x1FF);
+    return res_freq;
+}
+
+double ledcWriteNote(uint8_t chan, note_t note, uint8_t octave){
+    const uint16_t noteFrequencyBase[12] = {
+    //   C        C#       D        Eb       E        F       F#        G       G#        A       Bb        B
+        4186,    4435,    4699,    4978,    5274,    5588,    5920,    6272,    6645,    7040,    7459,    7902
+    };
+
+    if(octave > 8 || note >= NOTE_MAX){
+        return 0;
+    }
+    double noteFreq =  (double)noteFrequencyBase[note] / (double)(1 << (8-octave));
+    return ledcWriteTone(chan, noteFreq);
+}
+
+void ledcAttachPin(uint8_t pin, uint8_t chan)
+{
+    if(chan > LAST_CHAN) {
+        return;
+    }
+    pinMode(pin, OUTPUT);
+#if CONFIG_IDF_TARGET_ESP32S2
+    pinMatrixOutAttach(pin, LEDC_LS_SIG_OUT0_IDX + chan, false, false);
+#else
+    pinMatrixOutAttach(pin, ((chan/8)?LEDC_LS_SIG_OUT0_IDX:LEDC_HS_SIG_OUT0_IDX) + (chan%8), false, false);
+#endif
+}
+
+void ledcDetachPin(uint8_t pin)
+{
+    pinMatrixOutDetach(pin, false, false);
+}

cores/esp32/esp32-hal-ledc.h

@@ -0,0 +1,44 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32_HAL_LEDC_H_
+#define _ESP32_HAL_LEDC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef enum {
+    NOTE_C, NOTE_Cs, NOTE_D, NOTE_Eb, NOTE_E, NOTE_F, NOTE_Fs, NOTE_G, NOTE_Gs, NOTE_A, NOTE_Bb, NOTE_B, NOTE_MAX
+} note_t;
+
+//channel 0-15 resolution 1-16bits freq limits depend on resolution
+double      ledcSetup(uint8_t channel, double freq, uint8_t resolution_bits);
+void        ledcWrite(uint8_t channel, uint32_t duty);
+double      ledcWriteTone(uint8_t channel, double freq);
+double      ledcWriteNote(uint8_t channel, note_t note, uint8_t octave);
+uint32_t    ledcRead(uint8_t channel);
+double      ledcReadFreq(uint8_t channel);
+void        ledcAttachPin(uint8_t pin, uint8_t channel);
+void        ledcDetachPin(uint8_t pin);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP32_HAL_LEDC_H_ */

cores/esp32/esp32-hal-log.h

@@ -0,0 +1,159 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef __ARDUHAL_LOG_H__
+#define __ARDUHAL_LOG_H__
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "sdkconfig.h"
+#include "esp_timer.h"
+
+#define ARDUHAL_LOG_LEVEL_NONE       (0)
+#define ARDUHAL_LOG_LEVEL_ERROR      (1)
+#define ARDUHAL_LOG_LEVEL_WARN       (2)
+#define ARDUHAL_LOG_LEVEL_INFO       (3)
+#define ARDUHAL_LOG_LEVEL_DEBUG      (4)
+#define ARDUHAL_LOG_LEVEL_VERBOSE    (5)
+
+#ifndef CONFIG_ARDUHAL_LOG_DEFAULT_LEVEL
+#define CONFIG_ARDUHAL_LOG_DEFAULT_LEVEL ARDUHAL_LOG_LEVEL_NONE
+#endif
+
+#ifndef CORE_DEBUG_LEVEL
+#define ARDUHAL_LOG_LEVEL CONFIG_ARDUHAL_LOG_DEFAULT_LEVEL
+#else
+#define ARDUHAL_LOG_LEVEL CORE_DEBUG_LEVEL
+#endif
+
+#ifndef CONFIG_ARDUHAL_LOG_COLORS
+#define CONFIG_ARDUHAL_LOG_COLORS 0
+#endif
+
+#if CONFIG_ARDUHAL_LOG_COLORS
+#define ARDUHAL_LOG_COLOR_BLACK   "30"
+#define ARDUHAL_LOG_COLOR_RED     "31" //ERROR
+#define ARDUHAL_LOG_COLOR_GREEN   "32" //INFO
+#define ARDUHAL_LOG_COLOR_YELLOW  "33" //WARNING
+#define ARDUHAL_LOG_COLOR_BLUE    "34"
+#define ARDUHAL_LOG_COLOR_MAGENTA "35"
+#define ARDUHAL_LOG_COLOR_CYAN    "36" //DEBUG
+#define ARDUHAL_LOG_COLOR_GRAY    "37" //VERBOSE
+#define ARDUHAL_LOG_COLOR_WHITE   "38"
+
+#define ARDUHAL_LOG_COLOR(COLOR)  "\033[0;" COLOR "m"
+#define ARDUHAL_LOG_BOLD(COLOR)   "\033[1;" COLOR "m"
+#define ARDUHAL_LOG_RESET_COLOR   "\033[0m"
+
+#define ARDUHAL_LOG_COLOR_E       ARDUHAL_LOG_COLOR(ARDUHAL_LOG_COLOR_RED)
+#define ARDUHAL_LOG_COLOR_W       ARDUHAL_LOG_COLOR(ARDUHAL_LOG_COLOR_YELLOW)
+#define ARDUHAL_LOG_COLOR_I       ARDUHAL_LOG_COLOR(ARDUHAL_LOG_COLOR_GREEN)
+#define ARDUHAL_LOG_COLOR_D       ARDUHAL_LOG_COLOR(ARDUHAL_LOG_COLOR_CYAN)
+#define ARDUHAL_LOG_COLOR_V       ARDUHAL_LOG_COLOR(ARDUHAL_LOG_COLOR_GRAY)
+#else
+#define ARDUHAL_LOG_COLOR_E
+#define ARDUHAL_LOG_COLOR_W
+#define ARDUHAL_LOG_COLOR_I
+#define ARDUHAL_LOG_COLOR_D
+#define ARDUHAL_LOG_COLOR_V
+#define ARDUHAL_LOG_RESET_COLOR
+#endif
+
+const char * pathToFileName(const char * path);
+int log_printf(const char *fmt, ...);
+
+#define ARDUHAL_SHORT_LOG_FORMAT(letter, format)  ARDUHAL_LOG_COLOR_ ## letter format ARDUHAL_LOG_RESET_COLOR "\r\n"
+#define ARDUHAL_LOG_FORMAT(letter, format)  ARDUHAL_LOG_COLOR_ ## letter "[%6u][" #letter "][%s:%u] %s(): " format ARDUHAL_LOG_RESET_COLOR "\r\n", (unsigned long) (esp_timer_get_time() / 1000ULL), pathToFileName(__FILE__), __LINE__, __FUNCTION__
+
+#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_VERBOSE
+#define log_v(format, ...) log_printf(ARDUHAL_LOG_FORMAT(V, format), ##__VA_ARGS__)
+#define isr_log_v(format, ...) ets_printf(ARDUHAL_LOG_FORMAT(V, format), ##__VA_ARGS__)
+#else
+#define log_v(format, ...)
+#define isr_log_v(format, ...)
+#endif
+
+#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_DEBUG
+#define log_d(format, ...) log_printf(ARDUHAL_LOG_FORMAT(D, format), ##__VA_ARGS__)
+#define isr_log_d(format, ...) ets_printf(ARDUHAL_LOG_FORMAT(D, format), ##__VA_ARGS__)
+#else
+#define log_d(format, ...)
+#define isr_log_d(format, ...)
+#endif
+
+#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_INFO
+#define log_i(format, ...) log_printf(ARDUHAL_LOG_FORMAT(I, format), ##__VA_ARGS__)
+#define isr_log_i(format, ...) ets_printf(ARDUHAL_LOG_FORMAT(I, format), ##__VA_ARGS__)
+#else
+#define log_i(format, ...)
+#define isr_log_i(format, ...)
+#endif
+
+#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_WARN
+#define log_w(format, ...) log_printf(ARDUHAL_LOG_FORMAT(W, format), ##__VA_ARGS__)
+#define isr_log_w(format, ...) ets_printf(ARDUHAL_LOG_FORMAT(W, format), ##__VA_ARGS__)
+#else
+#define log_w(format, ...)
+#define isr_log_w(format, ...)
+#endif
+
+#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_ERROR
+#define log_e(format, ...) log_printf(ARDUHAL_LOG_FORMAT(E, format), ##__VA_ARGS__)
+#define isr_log_e(format, ...) ets_printf(ARDUHAL_LOG_FORMAT(E, format), ##__VA_ARGS__)
+#else
+#define log_e(format, ...)
+#define isr_log_e(format, ...)
+#endif
+
+#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_NONE
+#define log_n(format, ...) log_printf(ARDUHAL_LOG_FORMAT(E, format), ##__VA_ARGS__)
+#define isr_log_n(format, ...) ets_printf(ARDUHAL_LOG_FORMAT(E, format), ##__VA_ARGS__)
+#else
+#define log_n(format, ...)
+#define isr_log_n(format, ...)
+#endif
+
+#include "esp_log.h"
+
+#ifdef CONFIG_ARDUHAL_ESP_LOG
+#undef ESP_LOGE
+#undef ESP_LOGW
+#undef ESP_LOGI
+#undef ESP_LOGD
+#undef ESP_LOGV
+#undef ESP_EARLY_LOGE
+#undef ESP_EARLY_LOGW
+#undef ESP_EARLY_LOGI
+#undef ESP_EARLY_LOGD
+#undef ESP_EARLY_LOGV
+
+#define ESP_LOGE(tag, ...)  log_e(__VA_ARGS__)
+#define ESP_LOGW(tag, ...)  log_w(__VA_ARGS__)
+#define ESP_LOGI(tag, ...)  log_i(__VA_ARGS__)
+#define ESP_LOGD(tag, ...)  log_d(__VA_ARGS__)
+#define ESP_LOGV(tag, ...)  log_v(__VA_ARGS__)
+#define ESP_EARLY_LOGE(tag, ...)  isr_log_e(__VA_ARGS__)
+#define ESP_EARLY_LOGW(tag, ...)  isr_log_w(__VA_ARGS__)
+#define ESP_EARLY_LOGI(tag, ...)  isr_log_i(__VA_ARGS__)
+#define ESP_EARLY_LOGD(tag, ...)  isr_log_d(__VA_ARGS__)
+#define ESP_EARLY_LOGV(tag, ...)  isr_log_v(__VA_ARGS__)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ESP_LOGGING_H__ */

cores/esp32/esp32-hal-matrix.c

@@ -0,0 +1,59 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal-matrix.h"
+#include "esp_attr.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/gpio.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/gpio.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/gpio.h"
+#endif
+
+#define MATRIX_DETACH_OUT_SIG 0x100
+#define MATRIX_DETACH_IN_LOW_PIN 0x30
+#define MATRIX_DETACH_IN_LOW_HIGH 0x38
+
+void ARDUINO_ISR_ATTR pinMatrixOutAttach(uint8_t pin, uint8_t function, bool invertOut, bool invertEnable)
+{
+    gpio_matrix_out(pin, function, invertOut, invertEnable);
+}
+
+void ARDUINO_ISR_ATTR pinMatrixOutDetach(uint8_t pin, bool invertOut, bool invertEnable)
+{
+    gpio_matrix_out(pin, MATRIX_DETACH_OUT_SIG, invertOut, invertEnable);
+}
+
+void ARDUINO_ISR_ATTR pinMatrixInAttach(uint8_t pin, uint8_t signal, bool inverted)
+{
+    gpio_matrix_in(pin, signal, inverted);
+}
+
+void ARDUINO_ISR_ATTR pinMatrixInDetach(uint8_t signal, bool high, bool inverted)
+{
+    gpio_matrix_in(high?MATRIX_DETACH_IN_LOW_HIGH:MATRIX_DETACH_IN_LOW_PIN, signal, inverted);
+}
+/*
+void ARDUINO_ISR_ATTR intrMatrixAttach(uint32_t source, uint32_t inum){
+  intr_matrix_set(PRO_CPU_NUM, source, inum);
+}
+*/
+

cores/esp32/esp32-hal-matrix.h

@@ -0,0 +1,35 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32_HAL_MATRIX_H_
+#define _ESP32_HAL_MATRIX_H_
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "esp32-hal.h"
+#include "soc/gpio_sig_map.h"
+
+void pinMatrixOutAttach(uint8_t pin, uint8_t function, bool invertOut, bool invertEnable);
+void pinMatrixOutDetach(uint8_t pin, bool invertOut, bool invertEnable);
+void pinMatrixInAttach(uint8_t pin, uint8_t signal, bool inverted);
+void pinMatrixInDetach(uint8_t signal, bool high, bool inverted);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* COMPONENTS_ARDUHAL_INCLUDE_ESP32_HAL_MATRIX_H_ */

cores/esp32/esp32-hal-misc.c

@@ -0,0 +1,256 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "sdkconfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_attr.h"
+#include "nvs_flash.h"
+#include "nvs.h"
+#include "esp_partition.h"
+#include "esp_log.h"
+#include "esp_timer.h"
+#ifdef CONFIG_APP_ROLLBACK_ENABLE
+#include "esp_ota_ops.h"
+#endif //CONFIG_APP_ROLLBACK_ENABLE
+#ifdef CONFIG_BT_ENABLED
+#include "esp_bt.h"
+#endif //CONFIG_BT_ENABLED
+#include <sys/time.h>
+#include "soc/rtc.h"
+#include "soc/rtc_cntl_reg.h"
+#include "soc/apb_ctrl_reg.h"
+#include "esp_task_wdt.h"
+#include "esp32-hal.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/rtc.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/rtc.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/rtc.h"
+#endif
+
+//Undocumented!!! Get chip temperature in Farenheit
+//Source: https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchbook/ESP32_int_temp_sensor/ESP32_int_temp_sensor.ino
+uint8_t temprature_sens_read();
+
+float temperatureRead()
+{
+    return (temprature_sens_read() - 32) / 1.8;
+}
+
+void __yield()
+{
+    vPortYield();
+}
+
+void yield() __attribute__ ((weak, alias("__yield")));
+
+#if CONFIG_AUTOSTART_ARDUINO
+
+extern TaskHandle_t loopTaskHandle;
+extern bool loopTaskWDTEnabled;
+
+void enableLoopWDT(){
+    if(loopTaskHandle != NULL){
+        if(esp_task_wdt_add(loopTaskHandle) != ESP_OK){
+            log_e("Failed to add loop task to WDT");
+        } else {
+            loopTaskWDTEnabled = true;
+        }
+    }
+}
+
+void disableLoopWDT(){
+    if(loopTaskHandle != NULL && loopTaskWDTEnabled){
+        loopTaskWDTEnabled = false;
+        if(esp_task_wdt_delete(loopTaskHandle) != ESP_OK){
+            log_e("Failed to remove loop task from WDT");
+        }
+    }
+}
+
+void feedLoopWDT(){
+    esp_err_t err = esp_task_wdt_reset();
+    if(err != ESP_OK){
+        log_e("Failed to feed WDT! Error: %d", err);
+    }
+}
+#endif
+
+void enableCore0WDT(){
+    TaskHandle_t idle_0 = xTaskGetIdleTaskHandleForCPU(0);
+    if(idle_0 == NULL || esp_task_wdt_add(idle_0) != ESP_OK){
+        log_e("Failed to add Core 0 IDLE task to WDT");
+    }
+}
+
+void disableCore0WDT(){
+    TaskHandle_t idle_0 = xTaskGetIdleTaskHandleForCPU(0);
+    if(idle_0 == NULL || esp_task_wdt_delete(idle_0) != ESP_OK){
+        log_e("Failed to remove Core 0 IDLE task from WDT");
+    }
+}
+
+#ifndef CONFIG_FREERTOS_UNICORE
+void enableCore1WDT(){
+    TaskHandle_t idle_1 = xTaskGetIdleTaskHandleForCPU(1);
+    if(idle_1 == NULL || esp_task_wdt_add(idle_1) != ESP_OK){
+        log_e("Failed to add Core 1 IDLE task to WDT");
+    }
+}
+
+void disableCore1WDT(){
+    TaskHandle_t idle_1 = xTaskGetIdleTaskHandleForCPU(1);
+    if(idle_1 == NULL || esp_task_wdt_delete(idle_1) != ESP_OK){
+        log_e("Failed to remove Core 1 IDLE task from WDT");
+    }
+}
+#endif
+
+BaseType_t xTaskCreateUniversal( TaskFunction_t pxTaskCode,
+                        const char * const pcName,
+                        const uint32_t usStackDepth,
+                        void * const pvParameters,
+                        UBaseType_t uxPriority,
+                        TaskHandle_t * const pxCreatedTask,
+                        const BaseType_t xCoreID ){
+#ifndef CONFIG_FREERTOS_UNICORE
+    if(xCoreID >= 0 && xCoreID < 2) {
+        return xTaskCreatePinnedToCore(pxTaskCode, pcName, usStackDepth, pvParameters, uxPriority, pxCreatedTask, xCoreID);
+    } else {
+#endif
+    return xTaskCreate(pxTaskCode, pcName, usStackDepth, pvParameters, uxPriority, pxCreatedTask);
+#ifndef CONFIG_FREERTOS_UNICORE
+    }
+#endif
+}
+
+unsigned long ARDUINO_ISR_ATTR micros()
+{
+    return (unsigned long) (esp_timer_get_time());
+}
+
+unsigned long ARDUINO_ISR_ATTR millis()
+{
+    return (unsigned long) (esp_timer_get_time() / 1000ULL);
+}
+
+void delay(uint32_t ms)
+{
+    vTaskDelay(ms / portTICK_PERIOD_MS);
+}
+
+void ARDUINO_ISR_ATTR delayMicroseconds(uint32_t us)
+{
+    uint32_t m = micros();
+    if(us){
+        uint32_t e = (m + us);
+        if(m > e){ //overflow
+            while(micros() > e){
+                NOP();
+            }
+        }
+        while(micros() < e){
+            NOP();
+        }
+    }
+}
+
+void initVariant() __attribute__((weak));
+void initVariant() {}
+
+void init() __attribute__((weak));
+void init() {}
+
+bool verifyOta() __attribute__((weak));
+bool verifyOta() { return true; }
+
+#ifdef CONFIG_BT_ENABLED
+//overwritten in esp32-hal-bt.c
+bool btInUse() __attribute__((weak));
+bool btInUse(){ return false; }
+#endif
+
+void initArduino()
+{
+#ifdef CONFIG_APP_ROLLBACK_ENABLE
+    const esp_partition_t *running = esp_ota_get_running_partition();
+    esp_ota_img_states_t ota_state;
+    if (esp_ota_get_state_partition(running, &ota_state) == ESP_OK) {
+        if (ota_state == ESP_OTA_IMG_PENDING_VERIFY) {
+            if (verifyOta()) {
+                esp_ota_mark_app_valid_cancel_rollback();
+            } else {
+                log_e("OTA verification failed! Start rollback to the previous version ...");
+                esp_ota_mark_app_invalid_rollback_and_reboot();
+            }
+        }
+    }
+#endif
+    //init proper ref tick value for PLL (uncomment if REF_TICK is different than 1MHz)
+    //ESP_REG(APB_CTRL_PLL_TICK_CONF_REG) = APB_CLK_FREQ / REF_CLK_FREQ - 1;
+#ifdef F_CPU
+    setCpuFrequencyMhz(F_CPU/1000000);
+#endif
+#if CONFIG_SPIRAM_SUPPORT || CONFIG_SPIRAM
+    psramInit();
+#endif
+    esp_log_level_set("*", CONFIG_LOG_DEFAULT_LEVEL);
+    esp_err_t err = nvs_flash_init();
+    if(err == ESP_ERR_NVS_NO_FREE_PAGES){
+        const esp_partition_t* partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_NVS, NULL);
+        if (partition != NULL) {
+            err = esp_partition_erase_range(partition, 0, partition->size);
+            if(!err){
+                err = nvs_flash_init();
+            } else {
+                log_e("Failed to format the broken NVS partition!");
+            }
+        }
+    }
+    if(err) {
+        log_e("Failed to initialize NVS! Error: %u", err);
+    }
+#ifdef CONFIG_BT_ENABLED
+    if(!btInUse()){
+        esp_bt_controller_mem_release(ESP_BT_MODE_BTDM);
+    }
+#endif
+    init();
+    initVariant();
+}
+
+//used by hal log
+const char * ARDUINO_ISR_ATTR pathToFileName(const char * path)
+{
+    size_t i = 0;
+    size_t pos = 0;
+    char * p = (char *)path;
+    while(*p){
+        i++;
+        if(*p == '/' || *p == '\\'){
+            pos = i;
+        }
+        p++;
+    }
+    return path+pos;
+}
+

cores/esp32/esp32-hal-psram.c

@@ -0,0 +1,136 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal.h"
+
+#if CONFIG_SPIRAM_SUPPORT || CONFIG_SPIRAM
+#include "soc/efuse_reg.h"
+#include "esp_heap_caps.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/spiram.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/spiram.h"
+#include "esp32s2/rom/cache.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "esp_spiram.h"
+#endif
+
+static volatile bool spiramDetected = false;
+static volatile bool spiramFailed = false;
+
+bool psramInit(){
+    if (spiramDetected) {
+        return true;
+    }
+#ifndef CONFIG_SPIRAM_BOOT_INIT
+    if (spiramFailed) {
+        return false;
+    }
+#if CONFIG_IDF_TARGET_ESP32
+    uint32_t chip_ver = REG_GET_FIELD(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_VER_PKG);
+    uint32_t pkg_ver = chip_ver & 0x7;
+    if (pkg_ver == EFUSE_RD_CHIP_VER_PKG_ESP32D2WDQ5 || pkg_ver == EFUSE_RD_CHIP_VER_PKG_ESP32PICOD2) {
+        spiramFailed = true;
+        log_w("PSRAM not supported!");
+        return false;
+    }
+    esp_spiram_init_cache();
+#elif CONFIG_IDF_TARGET_ESP32S2
+    extern void esp_config_data_cache_mode(void);
+    esp_config_data_cache_mode();
+    Cache_Enable_DCache(0);
+#endif
+    if (esp_spiram_init() != ESP_OK) {
+        spiramFailed = true;
+        log_w("PSRAM init failed!");
+#if CONFIG_IDF_TARGET_ESP32
+        pinMatrixOutDetach(16, false, false);
+        pinMatrixOutDetach(17, false, false);
+#endif
+        return false;
+    }
+    esp_spiram_init_cache();
+    if (!esp_spiram_test()) {
+        spiramFailed = true;
+        log_e("PSRAM test failed!");
+        return false;
+    }
+    if (esp_spiram_add_to_heapalloc() != ESP_OK) {
+        spiramFailed = true;
+        log_e("PSRAM could not be added to the heap!");
+        return false;
+    }
+#if CONFIG_SPIRAM_MALLOC_ALWAYSINTERNAL && !CONFIG_ARDUINO_ISR_IRAM
+        heap_caps_malloc_extmem_enable(CONFIG_SPIRAM_MALLOC_ALWAYSINTERNAL);
+#endif
+#endif
+    spiramDetected = true;
+    log_d("PSRAM enabled");
+    return true;
+}
+
+bool ARDUINO_ISR_ATTR psramFound(){
+    return spiramDetected;
+}
+
+void ARDUINO_ISR_ATTR *ps_malloc(size_t size){
+    if(!spiramDetected){
+        return NULL;
+    }
+    return heap_caps_malloc(size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
+}
+
+void ARDUINO_ISR_ATTR *ps_calloc(size_t n, size_t size){
+    if(!spiramDetected){
+        return NULL;
+    }
+    return heap_caps_calloc(n, size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
+}
+
+void ARDUINO_ISR_ATTR *ps_realloc(void *ptr, size_t size){
+    if(!spiramDetected){
+        return NULL;
+    }
+    return heap_caps_realloc(ptr, size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
+}
+
+#else
+
+bool psramInit(){
+    return false;
+}
+
+bool ARDUINO_ISR_ATTR psramFound(){
+    return false;
+}
+
+void ARDUINO_ISR_ATTR *ps_malloc(size_t size){
+    return NULL;
+}
+
+void ARDUINO_ISR_ATTR *ps_calloc(size_t n, size_t size){
+    return NULL;
+}
+
+void ARDUINO_ISR_ATTR *ps_realloc(void *ptr, size_t size){
+    return NULL;
+}
+
+#endif

cores/esp32/esp32-hal-psram.h

@@ -0,0 +1,44 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32_HAL_PSRAM_H_
+#define _ESP32_HAL_PSRAM_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "sdkconfig.h"
+
+#ifndef BOARD_HAS_PSRAM
+#ifdef CONFIG_SPIRAM_SUPPORT
+#undef CONFIG_SPIRAM_SUPPORT
+#endif
+#ifdef CONFIG_SPIRAM
+#undef CONFIG_SPIRAM
+#endif
+#endif
+
+bool psramInit();
+bool psramFound();
+
+void *ps_malloc(size_t size);
+void *ps_calloc(size_t n, size_t size);
+void *ps_realloc(void *ptr, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP32_HAL_PSRAM_H_ */

cores/esp32/esp32-hal-rmt.c

@@ -0,0 +1,847 @@
+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "freertos/semphr.h"
+
+#include "esp32-hal.h"
+#include "esp8266-compat.h"
+#include "soc/gpio_reg.h"
+#include "soc/rmt_struct.h"
+#include "driver/periph_ctrl.h"
+#include "esp_intr_alloc.h"
+
+/**
+ * Internal macros
+ */
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#define MAX_CHANNELS 8
+#elif CONFIG_IDF_TARGET_ESP32S2
+#define MAX_CHANNELS 4
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#define MAX_DATA_PER_CHANNEL 64
+#define MAX_DATA_PER_ITTERATION 62
+#define _ABS(a) (a>0?a:-a)
+#define _LIMIT(a,b) (a>b?b:a)
+#define __INT_TX_END     (1)
+#define __INT_RX_END     (2)
+#define __INT_ERROR      (4)
+#define __INT_THR_EVNT   (1<<24)
+
+#define _INT_TX_END(channel) (__INT_TX_END<<(channel*3))
+#define _INT_RX_END(channel) (__INT_RX_END<<(channel*3))
+#define _INT_ERROR(channel)  (__INT_ERROR<<(channel*3))
+#define _INT_THR_EVNT(channel)  ((__INT_THR_EVNT)<<(channel))
+
+#if CONFIG_DISABLE_HAL_LOCKS
+# define RMT_MUTEX_LOCK(channel)
+# define RMT_MUTEX_UNLOCK(channel)
+#else
+# define RMT_MUTEX_LOCK(channel)    do {} while (xSemaphoreTake(g_rmt_objlocks[channel], portMAX_DELAY) != pdPASS)
+# define RMT_MUTEX_UNLOCK(channel)  xSemaphoreGive(g_rmt_objlocks[channel])
+#endif /* CONFIG_DISABLE_HAL_LOCKS */
+
+#define _RMT_INTERNAL_DEBUG
+#ifdef _RMT_INTERNAL_DEBUG
+# define DEBUG_INTERRUPT_START(pin)    digitalWrite(pin, 1);
+# define DEBUG_INTERRUPT_END(pin)      digitalWrite(pin, 0);
+#else
+# define DEBUG_INTERRUPT_START(pin)
+# define DEBUG_INTERRUPT_END(pin)
+#endif /* _RMT_INTERNAL_DEBUG */
+
+/**
+ * Typedefs for internal stuctures, enums
+ */
+typedef enum {
+    E_NO_INTR = 0,
+    E_TX_INTR = 1,
+    E_TXTHR_INTR = 2,
+    E_RX_INTR = 4,
+} intr_mode_t;
+
+typedef enum {
+    E_INACTIVE   = 0,
+    E_FIRST_HALF = 1,
+    E_LAST_DATA  = 2,
+    E_END_TRANS  = 4,
+    E_SET_CONTI =  8,
+} transaction_state_t;
+
+struct rmt_obj_s
+{
+    bool allocated;
+    EventGroupHandle_t events;
+    int pin;
+    int channel;
+    bool tx_not_rx;
+    int buffers;
+    int data_size;
+    uint32_t* data_ptr;
+    intr_mode_t intr_mode;
+    transaction_state_t tx_state;
+    rmt_rx_data_cb_t cb;
+    bool data_alloc;
+};
+
+/**
+ * Internal variables for channel descriptors
+ */
+static xSemaphoreHandle g_rmt_objlocks[MAX_CHANNELS] = {
+    NULL, NULL, NULL, NULL, 
+#if CONFIG_IDF_TARGET_ESP32
+    NULL, NULL, NULL, NULL
+#endif
+};
+
+static rmt_obj_t g_rmt_objects[MAX_CHANNELS] = {
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+#if CONFIG_IDF_TARGET_ESP32
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false},
+#endif
+};
+
+/**
+ * Internal variables for driver data
+ */
+static  intr_handle_t intr_handle;
+
+static bool periph_enabled = false;
+
+static xSemaphoreHandle g_rmt_block_lock = NULL;
+
+/**
+ * Internal method (private) declarations
+ */
+static void _initPin(int pin, int channel, bool tx_not_rx);
+
+static bool _rmtSendOnce(rmt_obj_t* rmt, rmt_data_t* data, size_t size, bool continuous);
+
+static void ARDUINO_ISR_ATTR _rmt_isr(void* arg);
+
+static rmt_obj_t* _rmtAllocate(int pin, int from, int size);
+
+static void _initPin(int pin, int channel, bool tx_not_rx);
+
+static int ARDUINO_ISR_ATTR _rmt_get_mem_len(uint8_t channel);
+
+static void ARDUINO_ISR_ATTR _rmt_tx_mem_first(uint8_t ch);
+
+static void ARDUINO_ISR_ATTR _rmt_tx_mem_second(uint8_t ch);
+
+
+/**
+ * Public method definitions
+ */
+bool rmtSetCarrier(rmt_obj_t* rmt, bool carrier_en, bool carrier_level, uint32_t low, uint32_t high)
+{
+    if (!rmt || low > 0xFFFF || high > 0xFFFF) {
+        return false;
+    }
+    size_t channel = rmt->channel;
+
+    RMT_MUTEX_LOCK(channel);
+
+    RMT.carrier_duty_ch[channel].low = low;
+    RMT.carrier_duty_ch[channel].high = high;
+    RMT.conf_ch[channel].conf0.carrier_en = carrier_en;
+    RMT.conf_ch[channel].conf0.carrier_out_lv = carrier_level;
+
+    RMT_MUTEX_UNLOCK(channel);
+
+    return true;
+
+}
+
+bool rmtSetFilter(rmt_obj_t* rmt, bool filter_en, uint32_t filter_level)
+{
+    if (!rmt || filter_level > 0xFF) {
+        return false;
+    }
+    size_t channel = rmt->channel;
+
+    RMT_MUTEX_LOCK(channel);
+
+    RMT.conf_ch[channel].conf1.rx_filter_thres = filter_level;
+    RMT.conf_ch[channel].conf1.rx_filter_en = filter_en;
+
+    RMT_MUTEX_UNLOCK(channel);
+
+    return true;
+
+}
+
+bool rmtSetRxThreshold(rmt_obj_t* rmt, uint32_t value)
+{
+    if (!rmt || value > 0xFFFF) {
+        return false;
+    }
+    size_t channel = rmt->channel;
+
+    RMT_MUTEX_LOCK(channel);
+    RMT.conf_ch[channel].conf0.idle_thres = value;
+    RMT_MUTEX_UNLOCK(channel);
+
+    return true;
+}
+
+
+bool rmtDeinit(rmt_obj_t *rmt)
+{
+    if (!rmt) {
+        return false;
+    }
+
+    // sanity check
+    if (rmt != &(g_rmt_objects[rmt->channel])) {
+        return false;
+    }
+
+    size_t from = rmt->channel;
+    size_t to = rmt->buffers + rmt->channel;
+    size_t i;
+
+#if !CONFIG_DISABLE_HAL_LOCKS
+    if(g_rmt_objlocks[from] != NULL) {
+        vSemaphoreDelete(g_rmt_objlocks[from]);
+    }
+#endif
+
+    if (g_rmt_objects[from].data_alloc) {
+        free(g_rmt_objects[from].data_ptr);
+    }
+    
+    for (i = from; i < to; i++) {
+        g_rmt_objects[i].allocated = false;
+    }
+
+    g_rmt_objects[from].channel = 0;
+    g_rmt_objects[from].buffers = 0;
+
+    return true;
+}
+
+bool rmtLoop(rmt_obj_t* rmt, rmt_data_t* data, size_t size)
+{
+    if (!rmt) {
+        return false;
+    }
+
+    int allocated_size = MAX_DATA_PER_CHANNEL * rmt->buffers;
+
+    if (size > allocated_size) {
+        return false;
+    }
+    return _rmtSendOnce(rmt, data, size, true);
+}
+
+bool rmtWrite(rmt_obj_t* rmt, rmt_data_t* data, size_t size)
+{
+    if (!rmt) {
+        return false;
+    }
+    
+    int channel = rmt->channel;
+    int allocated_size = MAX_DATA_PER_CHANNEL * rmt->buffers;
+
+    if (size > allocated_size) {
+
+        int half_tx_nr = MAX_DATA_PER_ITTERATION/2;
+        RMT_MUTEX_LOCK(channel);
+        // setup interrupt handler if not yet installed for half and full tx
+        if (!intr_handle) {
+            esp_intr_alloc(ETS_RMT_INTR_SOURCE, (int)ARDUINO_ISR_FLAG, _rmt_isr, NULL, &intr_handle);
+        }
+
+        rmt->data_size = size - MAX_DATA_PER_ITTERATION;
+        rmt->data_ptr = ((uint32_t*)data) + MAX_DATA_PER_ITTERATION;
+        rmt->intr_mode = E_TX_INTR | E_TXTHR_INTR;
+        rmt->tx_state = E_SET_CONTI | E_FIRST_HALF;
+
+        // init the tx limit for interruption
+        RMT.tx_lim_ch[channel].limit = half_tx_nr+2;
+        // reset memory pointer
+        RMT.conf_ch[channel].conf1.apb_mem_rst = 1;
+        RMT.conf_ch[channel].conf1.apb_mem_rst = 0;
+        RMT.conf_ch[channel].conf1.mem_rd_rst = 1;
+        RMT.conf_ch[channel].conf1.mem_rd_rst = 0;
+        RMT.conf_ch[channel].conf1.mem_wr_rst = 1;
+        RMT.conf_ch[channel].conf1.mem_wr_rst = 0;
+
+        // set the tx end mark
+        RMTMEM.chan[channel].data32[MAX_DATA_PER_ITTERATION].val = 0;
+
+        // clear and enable both Tx completed and half tx event
+        RMT.int_clr.val = _INT_TX_END(channel);
+        RMT.int_clr.val = _INT_THR_EVNT(channel);
+        RMT.int_clr.val = _INT_ERROR(channel);
+        
+        RMT.int_ena.val |= _INT_TX_END(channel);
+        RMT.int_ena.val |= _INT_THR_EVNT(channel);
+        RMT.int_ena.val |= _INT_ERROR(channel);
+
+        RMT_MUTEX_UNLOCK(channel);
+
+        // start the transation
+        return _rmtSendOnce(rmt, data, MAX_DATA_PER_ITTERATION, false);
+    } else {
+        // use one-go mode if data fits one buffer 
+        return _rmtSendOnce(rmt, data, size, false);
+    }
+}
+
+bool rmtReadData(rmt_obj_t* rmt, uint32_t* data, size_t size)
+{
+    if (!rmt) {
+        return false;
+    }
+    int channel = rmt->channel;
+
+    if (g_rmt_objects[channel].buffers < size/MAX_DATA_PER_CHANNEL) {
+        return false;
+    }
+
+    size_t i;
+    volatile uint32_t* rmt_mem_ptr = &(RMTMEM.chan[channel].data32[0].val);
+    for (i=0; i<size; i++) {
+        data[i] = *rmt_mem_ptr++;
+    }
+
+    return true;
+}
+
+bool rmtBeginReceive(rmt_obj_t* rmt)
+{
+    if (!rmt) {
+        return false;
+    }
+    int channel = rmt->channel;
+
+    RMT.int_clr.val = _INT_ERROR(channel);
+    RMT.int_ena.val |= _INT_ERROR(channel);
+
+    RMT.conf_ch[channel].conf1.mem_owner = 1;
+    RMT.conf_ch[channel].conf1.mem_wr_rst = 1;
+    RMT.conf_ch[channel].conf1.rx_en = 1;
+
+    return true;
+}
+
+bool rmtReceiveCompleted(rmt_obj_t* rmt)
+{
+    if (!rmt) {
+        return false;
+    }
+    int channel = rmt->channel;
+
+    if (RMT.int_raw.val&_INT_RX_END(channel)) {
+        // RX end flag
+        RMT.int_clr.val = _INT_RX_END(channel);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool rmtRead(rmt_obj_t* rmt, rmt_rx_data_cb_t cb)
+{
+    if (!rmt && !cb) {
+        return false;
+    }
+    int channel = rmt->channel;
+
+    RMT_MUTEX_LOCK(channel);
+    rmt->intr_mode = E_RX_INTR;
+    rmt->tx_state = E_FIRST_HALF;
+    rmt->cb = cb;
+    // allocate internally two buffers which would alternate
+    if (!rmt->data_alloc) {
+        rmt->data_ptr = (uint32_t*)malloc(2*MAX_DATA_PER_CHANNEL*(rmt->buffers)*sizeof(uint32_t));
+        rmt->data_size = MAX_DATA_PER_CHANNEL*rmt->buffers;
+        rmt->data_alloc = true;
+    }
+
+    RMT.conf_ch[channel].conf1.mem_owner = 1;
+
+    RMT.int_clr.val = _INT_RX_END(channel);
+    RMT.int_clr.val = _INT_ERROR(channel);
+    
+    RMT.int_ena.val |= _INT_RX_END(channel);
+    RMT.int_ena.val |= _INT_ERROR(channel);
+
+    RMT.conf_ch[channel].conf1.mem_wr_rst = 1;
+
+    RMT.conf_ch[channel].conf1.rx_en = 1;
+    RMT_MUTEX_UNLOCK(channel);
+
+    return true;
+}
+
+bool rmtReadAsync(rmt_obj_t* rmt, rmt_data_t* data, size_t size, void* eventFlag, bool waitForData, uint32_t timeout)
+{
+    if (!rmt) {
+        return false;
+    }
+    int channel = rmt->channel;
+
+    if (g_rmt_objects[channel].buffers < size/MAX_DATA_PER_CHANNEL) {
+        return false;
+    }
+
+    if (eventFlag) {
+        xEventGroupClearBits(eventFlag, RMT_FLAGS_ALL);
+        rmt->events = eventFlag;
+    }
+
+    if (data && size>0) {
+        rmt->data_ptr = (uint32_t*)data;
+        rmt->data_size = size;
+    }
+
+    RMT_MUTEX_LOCK(channel);
+    rmt->intr_mode = E_RX_INTR;
+
+    RMT.conf_ch[channel].conf1.mem_owner = 1;
+
+    RMT.int_clr.val = _INT_RX_END(channel);
+    RMT.int_clr.val = _INT_ERROR(channel);
+    
+    RMT.int_ena.val |= _INT_RX_END(channel);
+    RMT.int_ena.val |= _INT_ERROR(channel);
+
+    RMT.conf_ch[channel].conf1.mem_wr_rst = 1;
+
+    RMT.conf_ch[channel].conf1.rx_en = 1;
+    RMT_MUTEX_UNLOCK(channel);
+
+    // wait for data if requested so
+    if (waitForData && eventFlag) {
+        uint32_t flags = xEventGroupWaitBits(eventFlag, RMT_FLAGS_ALL,
+                            pdTRUE /* clear on exit */, pdFALSE /* wait for all bits */, timeout);
+        if (flags & RMT_FLAG_ERROR) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+float rmtSetTick(rmt_obj_t* rmt, float tick)
+{
+    if (!rmt) {
+        return false;
+    }
+    /*
+     divider field span from 1 (smallest), 2, 3, ... , 0xFF, 0x00 (highest)
+     * rmt tick from 1/80M -> 12.5ns  (1x)    div_cnt = 0x01
+                              3.2 us (256x)   div_cnt = 0x00
+     * rmt tick for 1 MHz  -> 1us (1x)        div_cnt = 0x01
+                              256us (256x)    div_cnt = 0x00
+    */
+    int apb_div = _LIMIT(tick/12.5, 256);
+    int ref_div = _LIMIT(tick/1000, 256);
+
+    float apb_tick = 12.5 * apb_div;
+    float ref_tick = 1000.0 * ref_div;
+    
+    size_t channel = rmt->channel;
+
+    if (_ABS(apb_tick - tick) < _ABS(ref_tick - tick)) {
+        RMT.conf_ch[channel].conf0.div_cnt = apb_div & 0xFF;
+        RMT.conf_ch[channel].conf1.ref_always_on = 1;
+        return apb_tick;
+    } else {
+        RMT.conf_ch[channel].conf0.div_cnt = ref_div & 0xFF;
+        RMT.conf_ch[channel].conf1.ref_always_on = 0;
+        return ref_tick;
+    }
+}
+
+rmt_obj_t* rmtInit(int pin, bool tx_not_rx, rmt_reserve_memsize_t memsize)
+{
+    int buffers = memsize;
+    rmt_obj_t* rmt;
+    size_t i;
+    size_t j;
+
+    // create common block mutex for protecting allocs from multiple threads
+    if (!g_rmt_block_lock) {
+        g_rmt_block_lock = xSemaphoreCreateMutex();
+    }
+    // lock
+    while (xSemaphoreTake(g_rmt_block_lock, portMAX_DELAY) != pdPASS) {}
+
+    for (i=0; i<MAX_CHANNELS; i++) {
+        for (j=0; j<buffers && i+j < MAX_CHANNELS; j++) {
+            // if the space is ocupied break and continue on other channel
+            if (g_rmt_objects[i+j].allocated) {
+                i += j; // continue searching from latter channel
+                break;
+            }
+        }
+        if (j == buffers) {
+            // found a space in channel descriptors
+            break;
+        }
+    }
+    if (i == MAX_CHANNELS || i+j > MAX_CHANNELS || j != buffers)  {
+        xSemaphoreGive(g_rmt_block_lock);
+        return NULL;
+    }
+    rmt = _rmtAllocate(pin, i, buffers);
+
+    xSemaphoreGive(g_rmt_block_lock);
+
+    size_t channel = i;
+
+#if !CONFIG_DISABLE_HAL_LOCKS
+    if(g_rmt_objlocks[channel] == NULL) {
+        g_rmt_objlocks[channel] = xSemaphoreCreateMutex();
+        if(g_rmt_objlocks[channel] == NULL) {
+            return NULL;
+        }
+    }
+#endif
+
+    RMT_MUTEX_LOCK(channel);
+
+    rmt->pin = pin;
+    rmt->tx_not_rx = tx_not_rx;
+    rmt->buffers =buffers;
+    rmt->channel = channel;
+    _initPin(pin, channel, tx_not_rx);
+
+    // Initialize the registers in default mode:
+    // - no carrier, filter
+    // - timebase tick of 1us
+    // - idle threshold set to 0x8000 (max pulse width + 1)
+    RMT.conf_ch[channel].conf0.div_cnt = 1;
+    RMT.conf_ch[channel].conf0.mem_size = buffers;
+    RMT.conf_ch[channel].conf0.carrier_en = 0;
+    RMT.conf_ch[channel].conf0.carrier_out_lv = 0;
+#if CONFIG_IDF_TARGET_ESP32
+    RMT.conf_ch[channel].conf0.mem_pd = 0;
+#endif
+    RMT.conf_ch[channel].conf0.idle_thres = 0x80;
+    RMT.conf_ch[channel].conf1.rx_en = 0;
+    RMT.conf_ch[channel].conf1.tx_conti_mode = 0;
+#if CONFIG_IDF_TARGET_ESP32
+    RMT.conf_ch[channel].conf1.ref_cnt_rst = 0;
+#else
+    RMT.conf_ch[channel].conf1.chk_rx_carrier_en = 0;
+#endif
+    RMT.conf_ch[channel].conf1.rx_filter_en = 0;
+    RMT.conf_ch[channel].conf1.rx_filter_thres = 0;
+    RMT.conf_ch[channel].conf1.idle_out_lv = 0;     // signal level for idle
+    RMT.conf_ch[channel].conf1.idle_out_en = 1;     // enable idle
+    RMT.conf_ch[channel].conf1.ref_always_on = 0;     // base clock
+    RMT.apb_conf.fifo_mask = 1;
+
+    if (tx_not_rx) {
+        // RMT.conf_ch[channel].conf1.rx_en = 0;
+        RMT.conf_ch[channel].conf1.mem_owner = 0;
+        RMT.conf_ch[channel].conf1.mem_rd_rst = 1;
+    } else {
+        // RMT.conf_ch[channel].conf1.rx_en = 1;
+        RMT.conf_ch[channel].conf1.mem_owner = 1;
+        RMT.conf_ch[channel].conf1.mem_wr_rst = 1;
+    }
+
+    // install interrupt if at least one channel is active
+    if (!intr_handle) {
+        esp_intr_alloc(ETS_RMT_INTR_SOURCE, (int)ARDUINO_ISR_FLAG, _rmt_isr, NULL, &intr_handle);
+    }
+    RMT_MUTEX_UNLOCK(channel);
+
+    return rmt;
+}
+
+/**
+ * Private methods definitions
+ */
+bool _rmtSendOnce(rmt_obj_t* rmt, rmt_data_t* data, size_t size, bool continuous)
+{
+    if (!rmt) {
+        return false;
+    }
+    int channel = rmt->channel;
+    RMT.apb_conf.fifo_mask = 1;
+    if (data && size>0) {
+        size_t i;
+        volatile uint32_t* rmt_mem_ptr = &(RMTMEM.chan[channel].data32[0].val);
+        for (i = 0; i < size; i++) {
+            *rmt_mem_ptr++ = data[i].val;
+        }
+        // tx end mark
+        RMTMEM.chan[channel].data32[size].val = 0;
+    }
+
+    RMT_MUTEX_LOCK(channel);
+    RMT.conf_ch[channel].conf1.tx_conti_mode = continuous;
+    RMT.conf_ch[channel].conf1.mem_rd_rst = 1;
+    RMT.conf_ch[channel].conf1.tx_start = 1;
+    RMT_MUTEX_UNLOCK(channel);
+
+    return true;
+}
+
+
+static rmt_obj_t* _rmtAllocate(int pin, int from, int size)
+{
+    size_t i;
+    // setup how many buffers shall we use
+    g_rmt_objects[from].buffers = size;
+
+    for (i=0; i<size; i++) {
+        // mark the block of channels as used
+        g_rmt_objects[i+from].allocated = true;
+    }
+    return &(g_rmt_objects[from]);
+}
+
+
+static void _initPin(int pin, int channel, bool tx_not_rx) 
+{
+    if (!periph_enabled) {
+        periph_enabled = true;
+        periph_module_enable( PERIPH_RMT_MODULE );
+    }
+    if (tx_not_rx) {
+        pinMode(pin, OUTPUT);
+        pinMatrixOutAttach(pin, RMT_SIG_OUT0_IDX + channel, 0, 0);
+    } else {
+        pinMode(pin, INPUT);
+        pinMatrixInAttach(pin, RMT_SIG_IN0_IDX + channel, 0);
+
+    }
+}
+
+
+static void ARDUINO_ISR_ATTR _rmt_isr(void* arg)
+{
+    int intr_val = RMT.int_st.val;
+    size_t ch;
+    for (ch = 0; ch < MAX_CHANNELS; ch++) {
+
+        if (intr_val & _INT_RX_END(ch)) {
+            // clear the flag
+            RMT.int_clr.val = _INT_RX_END(ch);
+            RMT.int_ena.val &= ~_INT_RX_END(ch);
+
+            if ((g_rmt_objects[ch].intr_mode) & E_RX_INTR) {
+                if (g_rmt_objects[ch].events) {
+                    xEventGroupSetBits(g_rmt_objects[ch].events, RMT_FLAG_RX_DONE);
+                }
+                if (g_rmt_objects[ch].data_ptr && g_rmt_objects[ch].data_size > 0) {
+                    size_t i;
+                    uint32_t * data = g_rmt_objects[ch].data_ptr;
+                    // in case of callback, provide switching between memories
+                    if (g_rmt_objects[ch].cb) {
+                        if (g_rmt_objects[ch].tx_state & E_FIRST_HALF) {
+                            g_rmt_objects[ch].tx_state &= ~E_FIRST_HALF;
+                        } else {
+                            g_rmt_objects[ch].tx_state |= E_FIRST_HALF;
+                            data += MAX_DATA_PER_CHANNEL*(g_rmt_objects[ch].buffers);
+                        }
+                    }
+                    uint32_t *data_received = data;
+                    for (i = 0; i < g_rmt_objects[ch].data_size; i++ ) {
+                        *data++ = RMTMEM.chan[ch].data32[i].val;
+                    }
+                    if (g_rmt_objects[ch].cb) {
+                        // actually received data ptr                        
+                        (g_rmt_objects[ch].cb)(data_received, _rmt_get_mem_len(ch));
+
+                        // restart the reception
+                        RMT.conf_ch[ch].conf1.mem_owner = 1;
+                        RMT.conf_ch[ch].conf1.mem_wr_rst = 1;
+                        RMT.conf_ch[ch].conf1.rx_en = 1;
+                        RMT.int_ena.val |= _INT_RX_END(ch);
+                    } else {
+                        // if not callback provide, expect only one Rx
+                        g_rmt_objects[ch].intr_mode &= ~E_RX_INTR;
+                    }
+                }
+            } else {
+                // Report error and disable Rx interrupt
+                log_e("Unexpected Rx interrupt!\n");  // TODO: eplace messages with log_X
+                RMT.int_ena.val &= ~_INT_RX_END(ch);
+            }
+
+
+        }
+
+        if (intr_val & _INT_ERROR(ch)) {
+            // clear the flag
+            RMT.int_clr.val = _INT_ERROR(ch);
+            RMT.int_ena.val &= ~_INT_ERROR(ch);
+            // report error 
+            log_e("RMT Error %d!\n", ch);
+            if (g_rmt_objects[ch].events) {
+                xEventGroupSetBits(g_rmt_objects[ch].events, RMT_FLAG_ERROR);
+            }
+            // reset memory
+            RMT.conf_ch[ch].conf1.mem_rd_rst = 1;
+            RMT.conf_ch[ch].conf1.mem_rd_rst = 0;
+            RMT.conf_ch[ch].conf1.mem_wr_rst = 1;
+            RMT.conf_ch[ch].conf1.mem_wr_rst = 0;
+        }
+
+        if (intr_val & _INT_TX_END(ch)) {
+
+            RMT.int_clr.val = _INT_TX_END(ch);
+            _rmt_tx_mem_second(ch);
+        }
+
+        if (intr_val & _INT_THR_EVNT(ch)) {
+            // clear the flag
+            RMT.int_clr.val = _INT_THR_EVNT(ch);
+
+            // initial setup of continuous mode
+            if (g_rmt_objects[ch].tx_state & E_SET_CONTI) {
+                RMT.conf_ch[ch].conf1.tx_conti_mode = 1;
+                g_rmt_objects[ch].intr_mode &= ~E_SET_CONTI;
+            }
+            _rmt_tx_mem_first(ch);
+        }
+    }
+}
+
+static void ARDUINO_ISR_ATTR _rmt_tx_mem_second(uint8_t ch)
+{
+    DEBUG_INTERRUPT_START(4)
+    uint32_t* data = g_rmt_objects[ch].data_ptr;
+    int half_tx_nr = MAX_DATA_PER_ITTERATION/2;
+    int i;
+
+    RMT.tx_lim_ch[ch].limit = half_tx_nr+2;
+    RMT.int_clr.val = _INT_THR_EVNT(ch);
+    RMT.int_ena.val |= _INT_THR_EVNT(ch);
+
+    g_rmt_objects[ch].tx_state |= E_FIRST_HALF;
+
+    if (data) {
+        int remaining_size = g_rmt_objects[ch].data_size;
+        // will the remaining data occupy the entire halfbuffer
+        if (remaining_size > half_tx_nr) {
+            for (i = 0; i < half_tx_nr; i++) {
+                RMTMEM.chan[ch].data32[half_tx_nr+i].val = data[i];
+            }
+            g_rmt_objects[ch].data_size -= half_tx_nr;
+            g_rmt_objects[ch].data_ptr += half_tx_nr;
+        } else {
+            for (i = 0; i < half_tx_nr; i++) {
+                if (i < remaining_size) {
+                    RMTMEM.chan[ch].data32[half_tx_nr+i].val = data[i];
+                } else {
+                    RMTMEM.chan[ch].data32[half_tx_nr+i].val = 0x000F000F;
+                }
+            }
+            g_rmt_objects[ch].data_ptr = NULL;
+
+        }
+    } else if   ((!(g_rmt_objects[ch].tx_state & E_LAST_DATA)) &&
+                 (!(g_rmt_objects[ch].tx_state & E_END_TRANS))) {
+        for (i = 0; i < half_tx_nr; i++) {
+            RMTMEM.chan[ch].data32[half_tx_nr+i].val = 0x000F000F;
+        }
+        RMTMEM.chan[ch].data32[half_tx_nr+i].val = 0;
+        g_rmt_objects[ch].tx_state |= E_LAST_DATA;
+        RMT.conf_ch[ch].conf1.tx_conti_mode = 0;
+    } else {
+        log_d("RMT Tx finished %d!\n", ch);
+        RMT.conf_ch[ch].conf1.tx_conti_mode = 0;
+        RMT.int_ena.val &= ~_INT_TX_END(ch);
+        RMT.int_ena.val &= ~_INT_THR_EVNT(ch);
+        g_rmt_objects[ch].intr_mode = E_NO_INTR;
+        g_rmt_objects[ch].tx_state = E_INACTIVE;
+    }
+    DEBUG_INTERRUPT_END(4);
+}
+
+static void ARDUINO_ISR_ATTR _rmt_tx_mem_first(uint8_t ch)
+{
+    DEBUG_INTERRUPT_START(2);
+    uint32_t* data = g_rmt_objects[ch].data_ptr;
+    int half_tx_nr = MAX_DATA_PER_ITTERATION/2;
+    int i;
+    RMT.int_ena.val &= ~_INT_THR_EVNT(ch);
+    RMT.tx_lim_ch[ch].limit = 0;
+
+    if (data) {
+        int remaining_size = g_rmt_objects[ch].data_size;
+
+        // will the remaining data occupy the entire halfbuffer
+        if (remaining_size > half_tx_nr) {
+            RMTMEM.chan[ch].data32[0].val = data[0] - 1;
+            for (i = 1; i < half_tx_nr; i++) {
+                RMTMEM.chan[ch].data32[i].val = data[i];
+            }
+            g_rmt_objects[ch].tx_state &= ~E_FIRST_HALF;
+            // turn off the treshold interrupt
+            RMT.int_ena.val &= ~_INT_THR_EVNT(ch);
+            RMT.tx_lim_ch[ch].limit = 0;
+            g_rmt_objects[ch].data_size -= half_tx_nr;
+            g_rmt_objects[ch].data_ptr += half_tx_nr;
+        } else {
+            RMTMEM.chan[ch].data32[0].val = data[0] - 1;
+            for (i = 1; i < half_tx_nr; i++) {
+                if (i < remaining_size) {
+                    RMTMEM.chan[ch].data32[i].val = data[i];
+                } else {
+                    RMTMEM.chan[ch].data32[i].val = 0x000F000F;
+                }
+            }
+
+            g_rmt_objects[ch].tx_state &= ~E_FIRST_HALF;
+            g_rmt_objects[ch].data_ptr = NULL;
+        }
+    } else { 
+        for (i = 0; i < half_tx_nr; i++) {
+            RMTMEM.chan[ch].data32[i].val = 0x000F000F;
+        }
+        RMTMEM.chan[ch].data32[i].val = 0;
+
+        g_rmt_objects[ch].tx_state &= ~E_FIRST_HALF;
+        RMT.tx_lim_ch[ch].limit = 0;
+        g_rmt_objects[ch].tx_state |= E_LAST_DATA;
+        RMT.conf_ch[ch].conf1.tx_conti_mode = 0;
+    }
+    DEBUG_INTERRUPT_END(2);
+}
+
+static int ARDUINO_ISR_ATTR _rmt_get_mem_len(uint8_t channel)
+{
+    int block_num = RMT.conf_ch[channel].conf0.mem_size;
+    int item_block_len = block_num * 64;
+    volatile rmt_item32_t* data = RMTMEM.chan[channel].data32;
+    int idx;
+    for(idx = 0; idx < item_block_len; idx++) {
+        if(data[idx].duration0 == 0) {
+            return idx;
+        } else if(data[idx].duration1 == 0) {
+            return idx + 1;
+        }
+    }
+    return idx;
+}

cores/esp32/esp32-hal-rmt.h

@@ -0,0 +1,147 @@
+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MAIN_ESP32_HAL_RMT_H_
+#define MAIN_ESP32_HAL_RMT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// notification flags
+#define RMT_FLAG_TX_DONE     (1)
+#define RMT_FLAG_RX_DONE     (2)
+#define RMT_FLAG_ERROR       (4)
+#define RMT_FLAGS_ALL        (RMT_FLAG_TX_DONE | RMT_FLAG_RX_DONE | RMT_FLAG_ERROR)
+
+struct rmt_obj_s;
+
+typedef enum {
+    RMT_MEM_64 =  1,
+    RMT_MEM_128 = 2,
+    RMT_MEM_192 = 3,
+    RMT_MEM_256 = 4,
+    RMT_MEM_320 = 5,
+    RMT_MEM_384 = 6,
+    RMT_MEM_448 = 7,
+    RMT_MEM_512 = 8,
+} rmt_reserve_memsize_t;
+
+typedef struct rmt_obj_s rmt_obj_t;
+
+typedef void (*rmt_rx_data_cb_t)(uint32_t *data, size_t len);
+
+typedef struct {
+    union {
+        struct {
+            uint32_t duration0 :15;
+            uint32_t level0 :1;
+            uint32_t duration1 :15;
+            uint32_t level1 :1;
+        };
+        uint32_t val;
+    };
+} rmt_data_t;
+
+/**
+*    Initialize the object
+*
+*/
+rmt_obj_t* rmtInit(int pin, bool tx_not_rx, rmt_reserve_memsize_t memsize);
+
+/**
+*    Sets the clock/divider of timebase the nearest tick to the supplied value in nanoseconds
+*    return the real actual tick value in ns
+*/
+float rmtSetTick(rmt_obj_t* rmt, float tick);
+
+/**
+*    Sending data in one-go mode or continual mode
+*     (more data being send while updating buffers in interrupts)
+*
+*/
+bool rmtWrite(rmt_obj_t* rmt, rmt_data_t* data, size_t size);
+
+/**
+*    Loop data up to the reserved memsize continuously
+*
+*/
+bool rmtLoop(rmt_obj_t* rmt, rmt_data_t* data, size_t size);
+
+/**
+*    Initiates async receive, event flag indicates data received
+*
+*/
+bool rmtReadAsync(rmt_obj_t* rmt, rmt_data_t* data, size_t size, void* eventFlag, bool waitForData, uint32_t timeout);
+
+/**
+*    Initiates async receive with automatic buffering
+*    and callback with data from ISR
+*
+*/
+bool rmtRead(rmt_obj_t* rmt, rmt_rx_data_cb_t cb);
+
+
+/*  Additional interface */
+
+/**
+*    Start reception
+*
+*/
+bool rmtBeginReceive(rmt_obj_t* rmt);
+
+/**
+*    Checks if reception completes
+*
+*/
+bool rmtReceiveCompleted(rmt_obj_t* rmt);
+
+/**
+*    Reads the data for particular channel
+*
+*/
+bool rmtReadData(rmt_obj_t* rmt, uint32_t* data, size_t size);
+
+/**
+ * Setting threshold for Rx completed
+ */
+bool rmtSetRxThreshold(rmt_obj_t* rmt, uint32_t value);
+
+/**
+ * Setting carrier
+ */
+bool rmtSetCarrier(rmt_obj_t* rmt, bool carrier_en, bool carrier_level, uint32_t low, uint32_t high);
+
+/**
+ * Setting input filter
+ */
+bool rmtSetFilter(rmt_obj_t* rmt, bool filter_en, uint32_t filter_level);
+
+/**
+ * Deinitialize the driver
+ */
+bool rmtDeinit(rmt_obj_t *rmt);
+
+// TODO:
+//  * uninstall interrupt when all channels are deinit
+//  * send only-conti mode with circular-buffer
+//  * put sanity checks to some macro or inlines
+//  * doxy comments
+//  * error reporting
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_RMT_H_ */

cores/esp32/esp32-hal-sigmadelta.c

@@ -0,0 +1,130 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/semphr.h"
+#include "esp32-hal-matrix.h"
+#include "soc/gpio_sd_reg.h"
+#include "soc/gpio_sd_struct.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/ets_sys.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/ets_sys.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/ets_sys.h"
+#endif
+
+
+#if CONFIG_DISABLE_HAL_LOCKS
+#define SD_MUTEX_LOCK()
+#define SD_MUTEX_UNLOCK()
+#else
+#define SD_MUTEX_LOCK()    do {} while (xSemaphoreTake(_sd_sys_lock, portMAX_DELAY) != pdPASS)
+#define SD_MUTEX_UNLOCK()  xSemaphoreGive(_sd_sys_lock)
+xSemaphoreHandle _sd_sys_lock;
+#endif
+
+static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    if(old_apb == new_apb){
+        return;
+    }
+    uint32_t iarg = (uint32_t)arg;
+    uint8_t channel = iarg;
+    if(ev_type == APB_BEFORE_CHANGE){
+        SIGMADELTA.cg.clk_en = 0;
+    } else {
+        old_apb /= 1000000;
+        new_apb /= 1000000;
+        SD_MUTEX_LOCK();
+        uint32_t old_prescale = SIGMADELTA.channel[channel].prescale + 1;
+        SIGMADELTA.channel[channel].prescale = ((new_apb * old_prescale) / old_apb) - 1;
+        SIGMADELTA.cg.clk_en = 0;
+        SIGMADELTA.cg.clk_en = 1;
+        SD_MUTEX_UNLOCK();
+    }
+}
+
+uint32_t sigmaDeltaSetup(uint8_t channel, uint32_t freq) //chan 0-7 freq 1220-312500
+{
+    if(channel > 7) {
+        return 0;
+    }
+#if !CONFIG_DISABLE_HAL_LOCKS
+    static bool tHasStarted = false;
+    if(!tHasStarted) {
+        tHasStarted = true;
+        _sd_sys_lock = xSemaphoreCreateMutex();
+    }
+#endif
+    uint32_t apb_freq = getApbFrequency();
+    uint32_t prescale = (apb_freq/(freq*256)) - 1;
+    if(prescale > 0xFF) {
+        prescale = 0xFF;
+    }
+    SD_MUTEX_LOCK();
+#ifndef CONFIG_IDF_TARGET_ESP32
+    SIGMADELTA.misc.function_clk_en = 1;
+#endif
+    SIGMADELTA.channel[channel].prescale = prescale;
+    SIGMADELTA.cg.clk_en = 0;
+    SIGMADELTA.cg.clk_en = 1;
+    SD_MUTEX_UNLOCK();
+    uint32_t iarg = channel;
+    addApbChangeCallback((void*)iarg, _on_apb_change);
+    return apb_freq/((prescale + 1) * 256);
+}
+
+void sigmaDeltaWrite(uint8_t channel, uint8_t duty) //chan 0-7 duty 8 bit
+{
+    if(channel > 7) {
+        return;
+    }
+    duty -= 128;
+    SD_MUTEX_LOCK();
+    SIGMADELTA.channel[channel].duty = duty;
+    SD_MUTEX_UNLOCK();
+}
+
+uint8_t sigmaDeltaRead(uint8_t channel) //chan 0-7
+{
+    if(channel > 7) {
+        return 0;
+    }
+    SD_MUTEX_LOCK();
+    uint8_t duty = SIGMADELTA.channel[channel].duty + 128;
+    SD_MUTEX_UNLOCK();
+    return duty;
+}
+
+void sigmaDeltaAttachPin(uint8_t pin, uint8_t channel) //channel 0-7
+{
+    if(channel > 7) {
+        return;
+    }
+    pinMode(pin, OUTPUT);
+    pinMatrixOutAttach(pin, GPIO_SD0_OUT_IDX + channel, false, false);
+}
+
+void sigmaDeltaDetachPin(uint8_t pin)
+{
+    pinMatrixOutDetach(pin, false, false);
+}

cores/esp32/esp32-hal-sigmadelta.h

@@ -0,0 +1,37 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32_HAL_SD_H_
+#define _ESP32_HAL_SD_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+//channel 0-7 freq 1220-312500 duty 0-255
+uint32_t    sigmaDeltaSetup(uint8_t channel, uint32_t freq);
+void        sigmaDeltaWrite(uint8_t channel, uint8_t duty);
+uint8_t     sigmaDeltaRead(uint8_t channel);
+void        sigmaDeltaAttachPin(uint8_t pin, uint8_t channel);
+void        sigmaDeltaDetachPin(uint8_t pin);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP32_HAL_SD_H_ */

cores/esp32/esp32-hal-spi.h

@@ -0,0 +1,144 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MAIN_ESP32_HAL_SPI_H_
+#define MAIN_ESP32_HAL_SPI_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "sdkconfig.h"
+#include <stdint.h>
+#include <stdbool.h>
+
+#define SPI_HAS_TRANSACTION
+
+#define FSPI  1 //SPI bus attached to the flash (can use the same data lines but different SS)
+#define HSPI  2 //SPI bus normally mapped to pins 12 - 15, but can be matrixed to any pins
+#if CONFIG_IDF_TARGET_ESP32
+#define VSPI  3 //SPI bus normally attached to pins 5, 18, 19 and 23, but can be matrixed to any pins
+#endif
+
+// This defines are not representing the real Divider of the ESP32
+// the Defines match to an AVR Arduino on 16MHz for better compatibility
+#define SPI_CLOCK_DIV2    0x00101001 //8 MHz
+#define SPI_CLOCK_DIV4    0x00241001 //4 MHz
+#define SPI_CLOCK_DIV8    0x004c1001 //2 MHz
+#define SPI_CLOCK_DIV16   0x009c1001 //1 MHz
+#define SPI_CLOCK_DIV32   0x013c1001 //500 KHz
+#define SPI_CLOCK_DIV64   0x027c1001 //250 KHz
+#define SPI_CLOCK_DIV128  0x04fc1001 //125 KHz
+
+#define SPI_MODE0 0
+#define SPI_MODE1 1
+#define SPI_MODE2 2
+#define SPI_MODE3 3
+
+#define SPI_CS0 0
+#define SPI_CS1 1
+#define SPI_CS2 2
+#define SPI_CS_MASK_ALL 0x7
+
+#define SPI_LSBFIRST 0
+#define SPI_MSBFIRST 1
+
+struct spi_struct_t;
+typedef struct spi_struct_t spi_t;
+
+spi_t * spiStartBus(uint8_t spi_num, uint32_t freq, uint8_t dataMode, uint8_t bitOrder);
+void spiStopBus(spi_t * spi);
+
+//Attach/Detach Signal Pins
+void spiAttachSCK(spi_t * spi, int8_t sck);
+void spiAttachMISO(spi_t * spi, int8_t miso);
+void spiAttachMOSI(spi_t * spi, int8_t mosi);
+void spiDetachSCK(spi_t * spi, int8_t sck);
+void spiDetachMISO(spi_t * spi, int8_t miso);
+void spiDetachMOSI(spi_t * spi, int8_t mosi);
+
+//Attach/Detach SS pin to SPI_CSx signal
+void spiAttachSS(spi_t * spi, uint8_t cs_num, int8_t ss);
+void spiDetachSS(spi_t * spi, int8_t ss);
+
+//Enable/Disable SPI_CSx pins
+void spiEnableSSPins(spi_t * spi, uint8_t cs_mask);
+void spiDisableSSPins(spi_t * spi, uint8_t cs_mask);
+
+//Enable/Disable hardware control of SPI_CSx pins
+void spiSSEnable(spi_t * spi);
+void spiSSDisable(spi_t * spi);
+
+//Activate enabled SPI_CSx pins
+void spiSSSet(spi_t * spi);
+//Deactivate enabled SPI_CSx pins
+void spiSSClear(spi_t * spi);
+
+void spiWaitReady(spi_t * spi);
+
+uint32_t spiGetClockDiv(spi_t * spi);
+uint8_t spiGetDataMode(spi_t * spi);
+uint8_t spiGetBitOrder(spi_t * spi);
+
+
+/*
+ * Non transaction based lock methods (each locks and unlocks when called)
+ * */
+void spiSetClockDiv(spi_t * spi, uint32_t clockDiv);
+void spiSetDataMode(spi_t * spi, uint8_t dataMode);
+void spiSetBitOrder(spi_t * spi, uint8_t bitOrder);
+
+void spiWrite(spi_t * spi, const uint32_t *data, uint8_t len);
+void spiWriteByte(spi_t * spi, uint8_t data);
+void spiWriteWord(spi_t * spi, uint16_t data);
+void spiWriteLong(spi_t * spi, uint32_t data);
+
+void spiTransfer(spi_t * spi, uint32_t *out, uint8_t len);
+uint8_t spiTransferByte(spi_t * spi, uint8_t data);
+uint16_t spiTransferWord(spi_t * spi, uint16_t data);
+uint32_t spiTransferLong(spi_t * spi, uint32_t data);
+void spiTransferBytes(spi_t * spi, const uint8_t * data, uint8_t * out, uint32_t size);
+void spiTransferBits(spi_t * spi, uint32_t data, uint32_t * out, uint8_t bits);
+
+/*
+ * New (EXPERIMENTAL) Transaction lock based API (lock once until endTransaction)
+ * */
+void spiTransaction(spi_t * spi, uint32_t clockDiv, uint8_t dataMode, uint8_t bitOrder);
+void spiSimpleTransaction(spi_t * spi);
+void spiEndTransaction(spi_t * spi);
+
+void spiWriteNL(spi_t * spi, const void * data_in, uint32_t len);
+void spiWriteByteNL(spi_t * spi, uint8_t data);
+void spiWriteShortNL(spi_t * spi, uint16_t data);
+void spiWriteLongNL(spi_t * spi, uint32_t data);
+void spiWritePixelsNL(spi_t * spi, const void * data_in, uint32_t len);
+
+#define spiTransferNL(spi, data, len) spiTransferBytesNL(spi, data, data, len)
+uint8_t spiTransferByteNL(spi_t * spi, uint8_t data);
+uint16_t spiTransferShortNL(spi_t * spi, uint16_t data);
+uint32_t spiTransferLongNL(spi_t * spi, uint32_t data);
+void spiTransferBytesNL(spi_t * spi, const void * data_in, uint8_t * data_out, uint32_t len);
+void spiTransferBitsNL(spi_t * spi, uint32_t data_in, uint32_t * data_out, uint8_t bits);
+
+/*
+ * Helper functions to translate frequency to clock divider and back
+ * */
+uint32_t spiFrequencyToClockDiv(uint32_t freq);
+uint32_t spiClockDivToFrequency(uint32_t freq);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_SPI_H_ */

cores/esp32/esp32-hal-time.c

@@ -0,0 +1,97 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal.h"
+#include "lwip/apps/sntp.h"
+//#include "tcpip_adapter.h"
+#include "esp_netif.h"
+
+static void setTimeZone(long offset, int daylight)
+{
+    char cst[17] = {0};
+    char cdt[17] = "DST";
+    char tz[33] = {0};
+
+    if(offset % 3600){
+        sprintf(cst, "UTC%ld:%02u:%02u", offset / 3600, abs((offset % 3600) / 60), abs(offset % 60));
+    } else {
+        sprintf(cst, "UTC%ld", offset / 3600);
+    }
+    if(daylight != 3600){
+        long tz_dst = offset - daylight;
+        if(tz_dst % 3600){
+            sprintf(cdt, "DST%ld:%02u:%02u", tz_dst / 3600, abs((tz_dst % 3600) / 60), abs(tz_dst % 60));
+        } else {
+            sprintf(cdt, "DST%ld", tz_dst / 3600);
+        }
+    }
+    sprintf(tz, "%s%s", cst, cdt);
+    setenv("TZ", tz, 1);
+    tzset();
+}
+
+/*
+ * configTime
+ * Source: https://github.com/esp8266/Arduino/blob/master/cores/esp8266/time.c
+ * */
+void configTime(long gmtOffset_sec, int daylightOffset_sec, const char* server1, const char* server2, const char* server3)
+{
+    //tcpip_adapter_init();  // Should not hurt anything if already inited
+    esp_netif_init();
+    if(sntp_enabled()){
+        sntp_stop();
+    }
+    sntp_setoperatingmode(SNTP_OPMODE_POLL);
+    sntp_setservername(0, (char*)server1);
+    sntp_setservername(1, (char*)server2);
+    sntp_setservername(2, (char*)server3);
+    sntp_init();
+    setTimeZone(-gmtOffset_sec, daylightOffset_sec);
+}
+
+/*
+ * configTzTime
+ * sntp setup using TZ environment variable
+ * */
+void configTzTime(const char* tz, const char* server1, const char* server2, const char* server3)
+{
+    //tcpip_adapter_init();  // Should not hurt anything if already inited
+    esp_netif_init();
+    if(sntp_enabled()){
+        sntp_stop();
+    }
+    sntp_setoperatingmode(SNTP_OPMODE_POLL);
+    sntp_setservername(0, (char*)server1);
+    sntp_setservername(1, (char*)server2);
+    sntp_setservername(2, (char*)server3);
+    sntp_init();
+    setenv("TZ", tz, 1);
+    tzset();
+}
+
+bool getLocalTime(struct tm * info, uint32_t ms)
+{
+    uint32_t start = millis();
+    time_t now;
+    while((millis()-start) <= ms) {
+        time(&now);
+        localtime_r(&now, info);
+        if(info->tm_year > (2016 - 1900)){
+            return true;
+        }
+        delay(10);
+    }
+    return false;
+}
+

cores/esp32/esp32-hal-timer.c

@@ -0,0 +1,358 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal-timer.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/xtensa_api.h"
+#include "freertos/task.h"
+#include "soc/timer_group_struct.h"
+#include "soc/dport_reg.h"
+#include "esp_attr.h"
+#include "driver/periph_ctrl.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/ets_sys.h"
+#include "esp_intr_alloc.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/ets_sys.h"
+#include "esp_intr_alloc.h"
+#include "soc/periph_defs.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/ets_sys.h"
+#include "esp_intr.h"
+#endif
+
+#define HWTIMER_LOCK()      portENTER_CRITICAL(timer->lock)
+#define HWTIMER_UNLOCK()    portEXIT_CRITICAL(timer->lock)
+
+typedef struct {
+    union {
+        struct {
+            uint32_t reserved0:   10;
+            uint32_t alarm_en:     1;             /*When set  alarm is enabled*/
+            uint32_t level_int_en: 1;             /*When set  level type interrupt will be generated during alarm*/
+            uint32_t edge_int_en:  1;             /*When set  edge type interrupt will be generated during alarm*/
+            uint32_t divider:     16;             /*Timer clock (T0/1_clk) pre-scale value.*/
+            uint32_t autoreload:   1;             /*When set  timer 0/1 auto-reload at alarming is enabled*/
+            uint32_t increase:     1;             /*When set  timer 0/1 time-base counter increment. When cleared timer 0 time-base counter decrement.*/
+            uint32_t enable:       1;             /*When set  timer 0/1 time-base counter is enabled*/
+        };
+        uint32_t val;
+    } config;
+    uint32_t cnt_low;                             /*Register to store timer 0/1 time-base counter current value lower 32 bits.*/
+    uint32_t cnt_high;                            /*Register to store timer 0 time-base counter current value higher 32 bits.*/
+    uint32_t update;                              /*Write any value will trigger a timer 0 time-base counter value update (timer 0 current value will be stored in registers above)*/
+    uint32_t alarm_low;                           /*Timer 0 time-base counter value lower 32 bits that will trigger the alarm*/
+    uint32_t alarm_high;                          /*Timer 0 time-base counter value higher 32 bits that will trigger the alarm*/
+    uint32_t load_low;                            /*Lower 32 bits of the value that will load into timer 0 time-base counter*/
+    uint32_t load_high;                           /*higher 32 bits of the value that will load into timer 0 time-base counter*/
+    uint32_t reload;                              /*Write any value will trigger timer 0 time-base counter reload*/
+} hw_timer_reg_t;
+
+typedef struct hw_timer_s {
+        hw_timer_reg_t * dev;
+        uint8_t num;
+        uint8_t group;
+        uint8_t timer;
+        portMUX_TYPE lock;
+} hw_timer_t;
+
+static hw_timer_t hw_timer[4] = {
+        {(hw_timer_reg_t *)(DR_REG_TIMERGROUP0_BASE),0,0,0,portMUX_INITIALIZER_UNLOCKED},
+        {(hw_timer_reg_t *)(DR_REG_TIMERGROUP0_BASE + 0x0024),1,0,1,portMUX_INITIALIZER_UNLOCKED},
+        {(hw_timer_reg_t *)(DR_REG_TIMERGROUP0_BASE + 0x1000),2,1,0,portMUX_INITIALIZER_UNLOCKED},
+        {(hw_timer_reg_t *)(DR_REG_TIMERGROUP0_BASE + 0x1024),3,1,1,portMUX_INITIALIZER_UNLOCKED}
+};
+
+typedef void (*voidFuncPtr)(void);
+static voidFuncPtr __timerInterruptHandlers[4] = {0,0,0,0};
+
+void ARDUINO_ISR_ATTR __timerISR(void * arg){
+#if CONFIG_IDF_TARGET_ESP32
+    uint32_t s0 = TIMERG0.int_st_timers.val;
+    uint32_t s1 = TIMERG1.int_st_timers.val;
+    TIMERG0.int_clr_timers.val = s0;
+    TIMERG1.int_clr_timers.val = s1;
+#else
+    uint32_t s0 = TIMERG0.int_st.val;
+    uint32_t s1 = TIMERG1.int_st.val;
+    TIMERG0.int_clr.val = s0;
+    TIMERG1.int_clr.val = s1;
+#endif
+    uint8_t status = (s1 & 3) << 2 | (s0 & 3);
+    uint8_t i = 4;
+    //restart the timers that should autoreload
+    while(i--){
+        hw_timer_reg_t * dev = hw_timer[i].dev;
+        if((status & (1 << i)) && dev->config.autoreload){
+            dev->config.alarm_en = 1;
+        }
+    }
+    i = 4;
+    //call callbacks
+    while(i--){
+        if(__timerInterruptHandlers[i] && (status & (1 << i))){
+            __timerInterruptHandlers[i]();
+        }
+    }
+}
+
+uint64_t timerRead(hw_timer_t *timer){
+    timer->dev->update = 1;
+    uint64_t h = timer->dev->cnt_high;
+    uint64_t l = timer->dev->cnt_low;
+    return (h << 32) | l;
+}
+
+uint64_t timerAlarmRead(hw_timer_t *timer){
+    uint64_t h = timer->dev->alarm_high;
+    uint64_t l = timer->dev->alarm_low;
+    return (h << 32) | l;
+}
+
+void timerWrite(hw_timer_t *timer, uint64_t val){
+    timer->dev->load_high = (uint32_t) (val >> 32);
+    timer->dev->load_low = (uint32_t) (val);
+    timer->dev->reload = 1;
+}
+
+void timerAlarmWrite(hw_timer_t *timer, uint64_t alarm_value, bool autoreload){
+    timer->dev->alarm_high = (uint32_t) (alarm_value >> 32);
+    timer->dev->alarm_low = (uint32_t) alarm_value;
+    timer->dev->config.autoreload = autoreload;
+}
+
+void timerSetConfig(hw_timer_t *timer, uint32_t config){
+    timer->dev->config.val = config;
+}
+
+uint32_t timerGetConfig(hw_timer_t *timer){
+    return timer->dev->config.val;
+}
+
+void timerSetCountUp(hw_timer_t *timer, bool countUp){
+    timer->dev->config.increase = countUp;
+}
+
+bool timerGetCountUp(hw_timer_t *timer){
+    return timer->dev->config.increase;
+}
+
+void timerSetAutoReload(hw_timer_t *timer, bool autoreload){
+    timer->dev->config.autoreload = autoreload;
+}
+
+bool timerGetAutoReload(hw_timer_t *timer){
+    return timer->dev->config.autoreload;
+}
+
+void timerSetDivider(hw_timer_t *timer, uint16_t divider){//2 to 65536
+    if(!divider){
+        divider = 0xFFFF;
+    } else if(divider == 1){
+        divider = 2;
+    }
+    int timer_en = timer->dev->config.enable;
+    timer->dev->config.enable = 0;
+    timer->dev->config.divider = divider;
+    timer->dev->config.enable = timer_en;
+}
+
+uint16_t timerGetDivider(hw_timer_t *timer){
+    return timer->dev->config.divider;
+}
+
+void timerStart(hw_timer_t *timer){
+    timer->dev->config.enable = 1;
+}
+
+void timerStop(hw_timer_t *timer){
+    timer->dev->config.enable = 0;
+}
+
+void timerRestart(hw_timer_t *timer){
+    timer->dev->config.enable = 0;
+    timer->dev->reload = 1;
+    timer->dev->config.enable = 1;
+}
+
+bool timerStarted(hw_timer_t *timer){
+    return timer->dev->config.enable;
+}
+
+void timerAlarmEnable(hw_timer_t *timer){
+    timer->dev->config.alarm_en = 1;
+}
+
+void timerAlarmDisable(hw_timer_t *timer){
+    timer->dev->config.alarm_en = 0;
+}
+
+bool timerAlarmEnabled(hw_timer_t *timer){
+    return timer->dev->config.alarm_en;
+}
+
+static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    hw_timer_t * timer = (hw_timer_t *)arg;
+    if(ev_type == APB_BEFORE_CHANGE){
+        timer->dev->config.enable = 0;
+    } else {
+        old_apb /= 1000000;
+        new_apb /= 1000000;
+        timer->dev->config.divider = (new_apb * timer->dev->config.divider) / old_apb;
+        timer->dev->config.enable = 1;
+    }
+}
+
+hw_timer_t * timerBegin(uint8_t num, uint16_t divider, bool countUp){
+    if(num > 3){
+        return NULL;
+    }
+    hw_timer_t * timer = &hw_timer[num];
+    if(timer->group) {
+    	periph_module_enable(PERIPH_TIMG1_MODULE);
+    } else {
+    	periph_module_enable(PERIPH_TIMG0_MODULE);
+    }
+    timer->dev->config.enable = 0;
+    if(timer->group) {
+        TIMERG1.int_ena.val &= ~BIT(timer->timer);
+#if CONFIG_IDF_TARGET_ESP32
+            TIMERG1.int_clr_timers.val |= BIT(timer->timer);
+#else
+            TIMERG1.int_clr.val = BIT(timer->timer);
+#endif
+    } else {
+        TIMERG0.int_ena.val &= ~BIT(timer->timer);
+#if CONFIG_IDF_TARGET_ESP32
+            TIMERG0.int_clr_timers.val |= BIT(timer->timer);
+#else
+            TIMERG0.int_clr.val = BIT(timer->timer);
+#endif
+    }
+#ifdef TIMER_GROUP_SUPPORTS_XTAL_CLOCK
+    timer->dev->config.use_xtal = 0;
+#endif
+    timerSetDivider(timer, divider);
+    timerSetCountUp(timer, countUp);
+    timerSetAutoReload(timer, false);
+    timerAttachInterrupt(timer, NULL, false);
+    timerWrite(timer, 0);
+    timer->dev->config.enable = 1;
+    addApbChangeCallback(timer, _on_apb_change);
+    return timer;
+}
+
+void timerEnd(hw_timer_t *timer){
+    timer->dev->config.enable = 0;
+    timerAttachInterrupt(timer, NULL, false);
+    removeApbChangeCallback(timer, _on_apb_change);
+}
+
+void timerAttachInterrupt(hw_timer_t *timer, void (*fn)(void), bool edge){
+	// EDGE DOES NOT WORK CURRENTLY
+	edge = false;
+
+    static bool initialized = false;
+    static intr_handle_t intr_handle = NULL;
+    if(intr_handle){
+        esp_intr_disable(intr_handle);
+    }
+    if(fn == NULL){
+        timer->dev->config.level_int_en = 0;
+        timer->dev->config.edge_int_en = 0;
+        timer->dev->config.alarm_en = 0;
+        if(timer->num & 2){
+            TIMERG1.int_ena.val &= ~BIT(timer->timer);
+#if CONFIG_IDF_TARGET_ESP32
+            TIMERG1.int_clr_timers.val |= BIT(timer->timer);
+#else
+            TIMERG1.int_clr.val = BIT(timer->timer);
+#endif
+        } else {
+            TIMERG0.int_ena.val &= ~BIT(timer->timer);
+#if CONFIG_IDF_TARGET_ESP32
+            TIMERG0.int_clr_timers.val |= BIT(timer->timer);
+#else
+            TIMERG0.int_clr.val = BIT(timer->timer);
+#endif
+        }
+        __timerInterruptHandlers[timer->num] = NULL;
+    } else {
+        __timerInterruptHandlers[timer->num] = fn;
+        timer->dev->config.level_int_en = edge?0:1;//When set, an alarm will generate a level type interrupt.
+        timer->dev->config.edge_int_en = edge?1:0;//When set, an alarm will generate an edge type interrupt.
+        int intr_source = 0;
+        if(!edge){
+            if(timer->group){
+                intr_source = ETS_TG1_T0_LEVEL_INTR_SOURCE + timer->timer;
+            } else {
+                intr_source = ETS_TG0_T0_LEVEL_INTR_SOURCE + timer->timer;
+            }
+        } else {
+            if(timer->group){
+                intr_source = ETS_TG1_T0_EDGE_INTR_SOURCE + timer->timer;
+            } else {
+                intr_source = ETS_TG0_T0_EDGE_INTR_SOURCE + timer->timer;
+            }
+        }
+        if(!initialized){
+            initialized = true;
+            esp_intr_alloc(intr_source, (int)(ARDUINO_ISR_FLAG|ESP_INTR_FLAG_LOWMED), __timerISR, NULL, &intr_handle);
+        } else {
+            intr_matrix_set(esp_intr_get_cpu(intr_handle), intr_source, esp_intr_get_intno(intr_handle));
+        }
+        if(timer->group){
+            TIMERG1.int_ena.val |= BIT(timer->timer);
+        } else {
+            TIMERG0.int_ena.val |= BIT(timer->timer);
+        }
+    }
+    if(intr_handle){
+        esp_intr_enable(intr_handle);
+    }
+}
+
+void timerDetachInterrupt(hw_timer_t *timer){
+    timerAttachInterrupt(timer, NULL, false);
+}
+
+uint64_t timerReadMicros(hw_timer_t *timer){
+    uint64_t timer_val = timerRead(timer);
+    uint16_t div = timerGetDivider(timer);
+    return timer_val * div / (getApbFrequency() / 1000000);
+}
+
+double timerReadSeconds(hw_timer_t *timer){
+    uint64_t timer_val = timerRead(timer);
+    uint16_t div = timerGetDivider(timer);
+    return (double)timer_val * div / getApbFrequency();
+}
+
+uint64_t timerAlarmReadMicros(hw_timer_t *timer){
+    uint64_t timer_val = timerAlarmRead(timer);
+    uint16_t div = timerGetDivider(timer);
+    return timer_val * div / (getApbFrequency() / 1000000);
+}
+
+double timerAlarmReadSeconds(hw_timer_t *timer){
+    uint64_t timer_val = timerAlarmRead(timer);
+    uint16_t div = timerGetDivider(timer);
+    return (double)timer_val * div / getApbFrequency();
+}

cores/esp32/esp32-hal-timer.h

@@ -0,0 +1,72 @@
+/*
+ Arduino.h - Main include file for the Arduino SDK
+ Copyright (c) 2005-2013 Arduino Team.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef MAIN_ESP32_HAL_TIMER_H_
+#define MAIN_ESP32_HAL_TIMER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "esp32-hal.h"
+#include "freertos/FreeRTOS.h"
+
+struct hw_timer_s;
+typedef struct hw_timer_s hw_timer_t;
+
+hw_timer_t * timerBegin(uint8_t timer, uint16_t divider, bool countUp);
+void timerEnd(hw_timer_t *timer);
+
+void timerSetConfig(hw_timer_t *timer, uint32_t config);
+uint32_t timerGetConfig(hw_timer_t *timer);
+
+void timerAttachInterrupt(hw_timer_t *timer, void (*fn)(void), bool edge);
+void timerDetachInterrupt(hw_timer_t *timer);
+
+void timerStart(hw_timer_t *timer);
+void timerStop(hw_timer_t *timer);
+void timerRestart(hw_timer_t *timer);
+void timerWrite(hw_timer_t *timer, uint64_t val);
+void timerSetDivider(hw_timer_t *timer, uint16_t divider);
+void timerSetCountUp(hw_timer_t *timer, bool countUp);
+void timerSetAutoReload(hw_timer_t *timer, bool autoreload);
+
+bool timerStarted(hw_timer_t *timer);
+uint64_t timerRead(hw_timer_t *timer);
+uint64_t timerReadMicros(hw_timer_t *timer);
+double timerReadSeconds(hw_timer_t *timer);
+uint16_t timerGetDivider(hw_timer_t *timer);
+bool timerGetCountUp(hw_timer_t *timer);
+bool timerGetAutoReload(hw_timer_t *timer);
+
+void timerAlarmEnable(hw_timer_t *timer);
+void timerAlarmDisable(hw_timer_t *timer);
+void timerAlarmWrite(hw_timer_t *timer, uint64_t interruptAt, bool autoreload);
+
+bool timerAlarmEnabled(hw_timer_t *timer);
+uint64_t timerAlarmRead(hw_timer_t *timer);
+uint64_t timerAlarmReadMicros(hw_timer_t *timer);
+double timerAlarmReadSeconds(hw_timer_t *timer);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_TIMER_H_ */

cores/esp32/esp32-hal-tinyusb.c

@@ -0,0 +1,702 @@
+
+#include "sdkconfig.h"
+#if CONFIG_USB_ENABLED
+#include <stdlib.h>
+
+#include "esp_log.h"
+
+#include "soc/soc.h"
+#include "soc/efuse_reg.h"
+#include "soc/rtc_cntl_reg.h"
+#include "soc/usb_struct.h"
+#include "soc/usb_reg.h"
+#include "soc/usb_wrap_reg.h"
+#include "soc/usb_wrap_struct.h"
+#include "soc/periph_defs.h"
+#include "soc/timer_group_struct.h"
+#include "soc/system_reg.h"
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "driver/gpio.h"
+#include "driver/periph_ctrl.h"
+
+#include "esp_efuse.h"
+#include "esp_efuse_table.h"
+
+#include "tinyusb.h"
+#include "esp32-hal.h"
+
+#include "esp32-hal-tinyusb.h"
+#include "esp32s2/rom/usb/usb_persist.h"
+
+typedef char tusb_str_t[127];
+
+static bool WEBUSB_ENABLED                = false;
+
+static tusb_str_t WEBUSB_URL              = "";
+static tusb_str_t USB_DEVICE_PRODUCT      = "";
+static tusb_str_t USB_DEVICE_MANUFACTURER = "";
+static tusb_str_t USB_DEVICE_SERIAL       = "";
+
+static uint8_t USB_DEVICE_ATTRIBUTES     = 0;
+static uint16_t USB_DEVICE_POWER         = 0;
+
+/*
+ * Device Descriptor
+ * */
+static tusb_desc_device_t tinyusb_device_descriptor = {
+        .bLength = sizeof(tusb_desc_device_t),
+        .bDescriptorType = TUSB_DESC_DEVICE,
+        .bcdUSB = 0,
+        .bDeviceClass = 0,
+        .bDeviceSubClass = 0,
+        .bDeviceProtocol = 0,
+        .bMaxPacketSize0 = CFG_TUD_ENDOINT0_SIZE,
+
+        .idVendor = 0,
+        .idProduct = 0,
+        .bcdDevice = 0,
+
+        .iManufacturer = 0x01,
+        .iProduct = 0x02,
+        .iSerialNumber = 0x03,
+
+        .bNumConfigurations = 0x01
+};
+
+/*
+ * String Descriptors
+ * */
+#define MAX_STRING_DESCRIPTORS 20
+static uint32_t tinyusb_string_descriptor_len = 4;
+static char * tinyusb_string_descriptor[MAX_STRING_DESCRIPTORS] = {
+        // array of pointer to string descriptors
+        "\x09\x04",   // 0: is supported language is English (0x0409)
+        USB_DEVICE_MANUFACTURER,// 1: Manufacturer
+        USB_DEVICE_PRODUCT,     // 2: Product
+        USB_DEVICE_SERIAL,      // 3: Serials, should use chip ID
+};
+
+
+/* Microsoft OS 2.0 registry property descriptor
+Per MS requirements https://msdn.microsoft.com/en-us/library/windows/hardware/hh450799(v=vs.85).aspx
+device should create DeviceInterfaceGUIDs. It can be done by driver and
+in case of real PnP solution device should expose MS "Microsoft OS 2.0
+registry property descriptor". Such descriptor can insert any record
+into Windows registry per device/configuration/interface. In our case it
+will insert "DeviceInterfaceGUIDs" multistring property.
+
+GUID is freshly generated and should be OK to use.
+
+https://developers.google.com/web/fundamentals/native-hardware/build-for-webusb/
+(Section Microsoft OS compatibility descriptors)
+ */
+
+#define MS_OS_20_DESC_LEN  0xB2
+
+static uint8_t const tinyusb_ms_os_20_descriptor[] =
+{
+        // Set header: length, type, windows version, total length
+        U16_TO_U8S_LE(0x000A), U16_TO_U8S_LE(MS_OS_20_SET_HEADER_DESCRIPTOR), U32_TO_U8S_LE(0x06030000), U16_TO_U8S_LE(MS_OS_20_DESC_LEN),
+
+        // Configuration subset header: length, type, configuration index, reserved, configuration total length
+        U16_TO_U8S_LE(0x0008), U16_TO_U8S_LE(MS_OS_20_SUBSET_HEADER_CONFIGURATION), 0, 0, U16_TO_U8S_LE(MS_OS_20_DESC_LEN-0x0A),
+
+        // Function Subset header: length, type, first interface, reserved, subset length
+        U16_TO_U8S_LE(0x0008), U16_TO_U8S_LE(MS_OS_20_SUBSET_HEADER_FUNCTION), 0, 0, U16_TO_U8S_LE(MS_OS_20_DESC_LEN-0x0A-0x08),
+
+        // MS OS 2.0 Compatible ID descriptor: length, type, compatible ID, sub compatible ID
+        U16_TO_U8S_LE(0x0014), U16_TO_U8S_LE(MS_OS_20_FEATURE_COMPATBLE_ID), 'W', 'I', 'N', 'U', 'S', 'B', 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sub-compatible
+
+        // MS OS 2.0 Registry property descriptor: length, type
+        U16_TO_U8S_LE(MS_OS_20_DESC_LEN-0x0A-0x08-0x08-0x14), U16_TO_U8S_LE(MS_OS_20_FEATURE_REG_PROPERTY),
+        U16_TO_U8S_LE(0x0007), U16_TO_U8S_LE(0x002A), // wPropertyDataType, wPropertyNameLength and PropertyName "DeviceInterfaceGUIDs\0" in UTF-16
+        'D', 0x00, 'e', 0x00, 'v', 0x00, 'i', 0x00, 'c', 0x00, 'e', 0x00, 'I', 0x00, 'n', 0x00, 't', 0x00, 'e', 0x00,
+        'r', 0x00, 'f', 0x00, 'a', 0x00, 'c', 0x00, 'e', 0x00, 'G', 0x00, 'U', 0x00, 'I', 0x00, 'D', 0x00, 's', 0x00, 0x00, 0x00,
+        U16_TO_U8S_LE(0x0050), // wPropertyDataLength
+        //bPropertyData: “{975F44D9-0D08-43FD-8B3E-127CA8AFFF9D}”.
+        '{', 0x00, '9', 0x00, '7', 0x00, '5', 0x00, 'F', 0x00, '4', 0x00, '4', 0x00, 'D', 0x00, '9', 0x00, '-', 0x00,
+        '0', 0x00, 'D', 0x00, '0', 0x00, '8', 0x00, '-', 0x00, '4', 0x00, '3', 0x00, 'F', 0x00, 'D', 0x00, '-', 0x00,
+        '8', 0x00, 'B', 0x00, '3', 0x00, 'E', 0x00, '-', 0x00, '1', 0x00, '2', 0x00, '7', 0x00, 'C', 0x00, 'A', 0x00,
+        '8', 0x00, 'A', 0x00, 'F', 0x00, 'F', 0x00, 'F', 0x00, '9', 0x00, 'D', 0x00, '}', 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+TU_VERIFY_STATIC(sizeof(tinyusb_ms_os_20_descriptor) == MS_OS_20_DESC_LEN, "Incorrect size");
+
+
+/*
+ * BOS Descriptor (required for webUSB)
+ * */
+#define BOS_TOTAL_LEN      (TUD_BOS_DESC_LEN + TUD_BOS_WEBUSB_DESC_LEN + TUD_BOS_MICROSOFT_OS_DESC_LEN)
+
+enum {
+    VENDOR_REQUEST_WEBUSB = 1,
+    VENDOR_REQUEST_MICROSOFT = 2
+};
+
+static uint8_t const tinyusb_bos_descriptor[] = {
+        // total length, number of device caps
+        TUD_BOS_DESCRIPTOR(BOS_TOTAL_LEN, 2),
+
+        // Vendor Code, iLandingPage
+        TUD_BOS_WEBUSB_DESCRIPTOR(VENDOR_REQUEST_WEBUSB, 1),
+
+        // Microsoft OS 2.0 descriptor
+        TUD_BOS_MS_OS_20_DESCRIPTOR(MS_OS_20_DESC_LEN, VENDOR_REQUEST_MICROSOFT)
+};
+
+/*
+ * URL Descriptor (required for webUSB)
+ * */
+typedef struct TU_ATTR_PACKED {
+  uint8_t bLength;
+  uint8_t bDescriptorType;
+  uint8_t bScheme;
+  char    url[127];
+} tinyusb_desc_webusb_url_t;
+
+static tinyusb_desc_webusb_url_t tinyusb_url_descriptor = {
+        .bLength         = 3,
+        .bDescriptorType = 3, // WEBUSB URL type
+        .bScheme         = 1, // URL Scheme Prefix: 0: "http://", 1: "https://", 255: ""
+        .url             = ""
+};
+
+/*
+ * Configuration Descriptor
+ * */
+
+static tinyusb_descriptor_cb_t tinyusb_loaded_interfaces_callbacks[USB_INTERFACE_MAX];
+static uint32_t tinyusb_loaded_interfaces_mask = 0;
+static uint8_t tinyusb_loaded_interfaces_num = 0;
+static uint16_t tinyusb_config_descriptor_len = 0;
+static uint8_t * tinyusb_config_descriptor = NULL;
+
+/*
+ * Endpoint Usage Tracking
+ * */
+typedef union {
+        struct {
+                uint32_t in:16;
+                uint32_t out:16;
+        };
+        uint32_t val;
+} tinyusb_endpoints_usage_t;
+
+static tinyusb_endpoints_usage_t tinyusb_endpoints;
+
+
+/*
+ * TinyUSB Callbacks
+ * */
+
+/**
+ * @brief Invoked when received GET CONFIGURATION DESCRIPTOR.
+ */
+uint8_t const *tud_descriptor_configuration_cb(uint8_t index)
+{
+    //log_d("%u", index);
+    return tinyusb_config_descriptor;
+}
+
+/**
+ * @brief Invoked when received GET DEVICE DESCRIPTOR.
+ */
+uint8_t const *tud_descriptor_device_cb(void)
+{
+    //log_d("");
+    return (uint8_t const *)&tinyusb_device_descriptor;
+}
+
+/**
+ * @brief Invoked when received GET STRING DESCRIPTOR request.
+ */
+uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid)
+{
+    //log_d("%u (0x%x)", index, langid);
+    static uint16_t _desc_str[127];
+    uint8_t chr_count;
+
+    if (index == 0) {
+        memcpy(&_desc_str[1], tinyusb_string_descriptor[0], 2);
+        chr_count = 1;
+    } else {
+        // Convert ASCII string into UTF-16
+        if (index >= tinyusb_string_descriptor_len) {
+            return NULL;
+        }
+        const char *str = tinyusb_string_descriptor[index];
+        // Cap at max char
+        chr_count = strlen(str);
+        if (chr_count > 126) {
+            chr_count = 126;
+        }
+        for (uint8_t i = 0; i < chr_count; i++) {
+            _desc_str[1 + i] = str[i];
+        }
+    }
+
+    // first byte is len, second byte is string type
+    _desc_str[0] = (TUSB_DESC_STRING << 8 ) | (2*chr_count + 2);
+
+    return _desc_str;
+}
+
+/**
+ * @brief Invoked when received GET BOS DESCRIPTOR request.
+ */
+uint8_t const * tud_descriptor_bos_cb(void)
+{
+    //log_d("");
+    return tinyusb_bos_descriptor;
+}
+
+__attribute__ ((weak)) bool tinyusb_vendor_control_request_cb(uint8_t rhport, tusb_control_request_t const * request){ return false; }
+__attribute__ ((weak)) bool tinyusb_vendor_control_complete_cb(uint8_t rhport, tusb_control_request_t const * request){ return true; }
+
+/**
+ * @brief Handle WebUSB and Vendor requests.
+ */
+bool tud_vendor_control_request_cb(uint8_t rhport, tusb_control_request_t const * request)
+{
+    if(WEBUSB_ENABLED && (request->bRequest == VENDOR_REQUEST_WEBUSB
+            || (request->bRequest == VENDOR_REQUEST_MICROSOFT && request->wIndex == 7))){
+        if(request->bRequest == VENDOR_REQUEST_WEBUSB){
+            // match vendor request in BOS descriptor
+            // Get landing page url
+            tinyusb_url_descriptor.bLength = 3 + strlen(WEBUSB_URL);
+            snprintf(tinyusb_url_descriptor.url, 127, "%s", WEBUSB_URL);
+            return tud_control_xfer(rhport, request, (void*) &tinyusb_url_descriptor, tinyusb_url_descriptor.bLength);
+        }
+        // Get Microsoft OS 2.0 compatible descriptor
+        uint16_t total_len;
+        memcpy(&total_len, tinyusb_ms_os_20_descriptor + 8, 2);
+        return tud_control_xfer(rhport, request, (void*) tinyusb_ms_os_20_descriptor, total_len);
+    }
+    return tinyusb_vendor_control_request_cb(rhport, request);
+}
+
+bool tud_vendor_control_complete_cb(uint8_t rhport, tusb_control_request_t const * request)
+{
+    if(!WEBUSB_ENABLED || !(request->bRequest == VENDOR_REQUEST_WEBUSB
+            || (request->bRequest == VENDOR_REQUEST_MICROSOFT && request->wIndex == 7))){
+        return tinyusb_vendor_control_complete_cb(rhport, request);
+    }
+    return true;
+}
+
+/*
+ * Required Callbacks
+ * */
+#if CFG_TUD_HID
+__attribute__ ((weak)) const uint8_t * tud_hid_descriptor_report_cb(void){return NULL;}
+__attribute__ ((weak)) uint16_t tud_hid_get_report_cb(uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen){return 0;}
+__attribute__ ((weak)) void tud_hid_set_report_cb(uint8_t report_id, hid_report_type_t report_type, const uint8_t * buffer, uint16_t bufsize){}
+#endif
+#if CFG_TUD_MSC
+__attribute__ ((weak)) bool tud_msc_test_unit_ready_cb(uint8_t lun){return false;}
+__attribute__ ((weak)) void tud_msc_inquiry_cb(uint8_t lun, uint8_t vendor_id[8], uint8_t product_id[16], uint8_t product_rev[4]){}
+__attribute__ ((weak)) void tud_msc_capacity_cb(uint8_t lun, uint32_t* block_count, uint16_t* block_size){}
+__attribute__ ((weak)) int32_t tud_msc_read10_cb(uint8_t lun, uint32_t lba, uint32_t offset, void* buffer, uint32_t bufsize){return -1;}
+__attribute__ ((weak)) int32_t tud_msc_write10_cb(uint8_t lun, uint32_t lba, uint32_t offset, uint8_t* buffer, uint32_t bufsize){return -1;}
+__attribute__ ((weak)) int32_t tud_msc_scsi_cb (uint8_t lun, uint8_t const scsi_cmd[16], void* buffer, uint16_t bufsize){return -1;}
+#endif
+
+
+/*
+ * Private API
+ * */
+static bool usb_persist_enabled = false;
+static restart_type_t usb_persist_mode = RESTART_NO_PERSIST;
+
+static bool tinyusb_reserve_in_endpoint(uint8_t endpoint){
+    if(endpoint > 6 || (tinyusb_endpoints.in & BIT(endpoint)) != 0){
+        return false;
+    }
+    tinyusb_endpoints.in |= BIT(endpoint);
+    return true;
+}
+
+static bool tinyusb_reserve_out_endpoint(uint8_t endpoint){
+    if(endpoint > 6 || (tinyusb_endpoints.out & BIT(endpoint)) != 0){
+        return false;
+    }
+    tinyusb_endpoints.out |= BIT(endpoint);
+    return true;
+}
+
+static bool tinyusb_has_available_fifos(void){
+    uint8_t max_endpoints = 4, active_endpoints = 0;
+    if (tinyusb_loaded_interfaces_mask & BIT(USB_INTERFACE_CDC)) {
+        max_endpoints = 5; //CDC endpoint 0x85 is actually not linked to FIFO and not used
+    }
+    for(uint8_t i=1; i<7; i++){
+        if((tinyusb_endpoints.in & BIT(i)) != 0){
+            active_endpoints++;
+        }
+    }
+
+    return active_endpoints < max_endpoints;
+}
+
+static uint16_t tinyusb_load_descriptor(tinyusb_interface_t interface, uint8_t * dst, uint8_t * itf)
+{
+    if(tinyusb_loaded_interfaces_callbacks[interface]){
+        return tinyusb_loaded_interfaces_callbacks[interface](dst, itf);
+    }
+    return 0;
+}
+
+static bool tinyusb_load_enabled_interfaces(){
+    tinyusb_config_descriptor_len += TUD_CONFIG_DESC_LEN;
+    tinyusb_config_descriptor = (uint8_t *)malloc(tinyusb_config_descriptor_len);
+    if (tinyusb_config_descriptor == NULL) {
+        log_e("Descriptor Malloc Failed");
+        return false;
+    }
+    uint8_t * dst = tinyusb_config_descriptor + TUD_CONFIG_DESC_LEN;
+
+    for(int i=0; i<USB_INTERFACE_MAX; i++){
+        if (tinyusb_loaded_interfaces_mask & (1U << i)) {
+            uint16_t len = tinyusb_load_descriptor((tinyusb_interface_t)i, dst, &tinyusb_loaded_interfaces_num);
+            if (!len) {
+                log_e("Descriptor Load Failed");
+                return false;
+            } else {
+                if(i == USB_INTERFACE_CDC){
+                    if(!tinyusb_reserve_out_endpoint(3) ||!tinyusb_reserve_in_endpoint(4) || !tinyusb_reserve_in_endpoint(5)){
+                        log_e("CDC Reserve Endpoints Failed");
+                        return false;
+                    }
+                }
+                dst += len;
+            }
+        }
+    }
+    uint8_t str_index = tinyusb_add_string_descriptor("TinyUSB Device");
+    uint8_t descriptor[TUD_CONFIG_DESC_LEN] = {
+            //num configs, interface count, string index, total length, attribute, power in mA
+            TUD_CONFIG_DESCRIPTOR(1, tinyusb_loaded_interfaces_num, str_index, tinyusb_config_descriptor_len, USB_DEVICE_ATTRIBUTES, USB_DEVICE_POWER)
+    };
+    memcpy(tinyusb_config_descriptor, descriptor, TUD_CONFIG_DESC_LEN);
+    if ((tinyusb_loaded_interfaces_mask == (BIT(USB_INTERFACE_CDC) | BIT(USB_INTERFACE_DFU))) || (tinyusb_loaded_interfaces_mask == BIT(USB_INTERFACE_CDC))) {
+        usb_persist_enabled = true;
+        log_d("USB Persist enabled");
+    }
+    log_d("Load Done: if_num: %u, descr_len: %u, if_mask: 0x%x", tinyusb_loaded_interfaces_num, tinyusb_config_descriptor_len, tinyusb_loaded_interfaces_mask);
+    return true;
+}
+
+static inline char nibble_to_hex_char(uint8_t b)
+{
+    if (b < 0xa) {
+        return '0' + b;
+    } else {
+        return 'a' + b - 0xa;
+    }
+}
+
+static void set_usb_serial_num(void)
+{
+    /* Get the MAC address */
+    const uint32_t mac0 = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_0_REG, EFUSE_MAC_0);
+    const uint32_t mac1 = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_1_REG, EFUSE_MAC_1);
+    uint8_t mac_bytes[6];
+    memcpy(mac_bytes, &mac0, 4);
+    memcpy(mac_bytes + 4, &mac1, 2);
+
+    /* Convert to UTF16 string */
+    uint8_t* srl = (uint8_t*)USB_DEVICE_SERIAL;
+    for (int i = 0; i < 6; ++i) {
+        uint8_t b = mac_bytes[5 - i]; /* printing from the MSB */
+        if (i) {
+            *srl++ = ':';
+        }
+        *srl++ = nibble_to_hex_char(b >> 4);
+        *srl++ = nibble_to_hex_char(b & 0xf);
+    }
+    *srl++ = '\0';
+}
+
+static void tinyusb_apply_device_config(tinyusb_device_config_t *config){
+    if(config->product_name){
+        snprintf(USB_DEVICE_PRODUCT, 126, "%s", config->product_name);
+    }
+    
+    if(config->manufacturer_name){
+        snprintf(USB_DEVICE_MANUFACTURER, 126, "%s", config->manufacturer_name);
+    }
+    
+    if(config->serial_number && config->serial_number[0]){
+        snprintf(USB_DEVICE_SERIAL, 126, "%s", config->serial_number);
+    } else {
+        set_usb_serial_num();
+    }
+    
+    if(config->webusb_url){
+        snprintf(WEBUSB_URL, 126, "%s", config->webusb_url);
+    }
+
+    WEBUSB_ENABLED            = config->webusb_enabled;
+    USB_DEVICE_ATTRIBUTES     = config->usb_attributes;
+    USB_DEVICE_POWER          = config->usb_power_ma;
+    
+    tinyusb_device_descriptor.bcdUSB = config->usb_version;
+    tinyusb_device_descriptor.idVendor = config->vid;
+    tinyusb_device_descriptor.idProduct = config->pid;
+    tinyusb_device_descriptor.bcdDevice = config->fw_version;
+    tinyusb_device_descriptor.bDeviceClass = config->usb_class;
+    tinyusb_device_descriptor.bDeviceSubClass = config->usb_subclass;
+    tinyusb_device_descriptor.bDeviceProtocol = config->usb_protocol;
+}
+
+static void IRAM_ATTR usb_persist_shutdown_handler(void)
+{
+    if(usb_persist_mode != RESTART_NO_PERSIST){
+        if (usb_persist_enabled) {
+            REG_SET_BIT(RTC_CNTL_USB_CONF_REG, RTC_CNTL_IO_MUX_RESET_DISABLE);
+            REG_SET_BIT(RTC_CNTL_USB_CONF_REG, RTC_CNTL_USB_RESET_DISABLE);
+        }
+        if (usb_persist_mode == RESTART_BOOTLOADER) {
+            //USB CDC Download
+            if (usb_persist_enabled) {
+                USB_WRAP.date.val = USBDC_PERSIST_ENA;
+            }
+            REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
+            periph_module_disable(PERIPH_TIMG1_MODULE);
+        } else if (usb_persist_mode == RESTART_BOOTLOADER_DFU) {
+            //DFU Download
+            USB_WRAP.date.val = USBDC_BOOT_DFU;
+            REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
+            periph_module_disable(PERIPH_TIMG0_MODULE);
+            periph_module_disable(PERIPH_TIMG1_MODULE);
+        } else if (usb_persist_enabled) {
+            //USB Persist reboot
+            USB_WRAP.date.val = USBDC_PERSIST_ENA;
+        }
+        SET_PERI_REG_MASK(RTC_CNTL_OPTIONS0_REG, RTC_CNTL_SW_PROCPU_RST);
+    }
+}
+
+// USB Device Driver task
+// This top level thread processes all usb events and invokes callbacks
+static void usb_device_task(void *param) {
+    (void)param;
+    while(1) tud_task(); // RTOS forever loop
+}
+
+/*
+ * PUBLIC API
+ * */
+
+esp_err_t tinyusb_enable_interface(tinyusb_interface_t interface, uint16_t descriptor_len, tinyusb_descriptor_cb_t cb)
+{
+    if((interface >= USB_INTERFACE_MAX) || (tinyusb_loaded_interfaces_mask & (1U << interface))){
+        log_e("Interface %u not enabled", interface);
+        return ESP_FAIL;
+    }
+    tinyusb_loaded_interfaces_mask |= (1U << interface);
+    tinyusb_config_descriptor_len += descriptor_len;
+    tinyusb_loaded_interfaces_callbacks[interface] = cb;
+    log_d("Interface %u enabled", interface);
+    return ESP_OK;
+}
+
+esp_err_t tinyusb_init(tinyusb_device_config_t *config) {
+    static bool initialized = false;
+    if(initialized){
+        return ESP_OK;
+    }
+    initialized = true;
+    
+    tinyusb_endpoints.val = 0;
+    tinyusb_apply_device_config(config);
+    if (!tinyusb_load_enabled_interfaces()) {
+        initialized = false;
+        return ESP_FAIL;
+    }
+
+    bool usb_did_persist = (USB_WRAP.date.val == USBDC_PERSIST_ENA);
+
+    if(usb_did_persist && usb_persist_enabled){
+        // Enable USB/IO_MUX peripheral reset, if coming from persistent reboot
+        REG_CLR_BIT(RTC_CNTL_USB_CONF_REG, RTC_CNTL_IO_MUX_RESET_DISABLE);
+        REG_CLR_BIT(RTC_CNTL_USB_CONF_REG, RTC_CNTL_USB_RESET_DISABLE);
+    } else {
+        // Reset USB module
+        periph_module_reset(PERIPH_USB_MODULE);
+        periph_module_enable(PERIPH_USB_MODULE);
+    }
+
+    if (usb_persist_enabled && esp_register_shutdown_handler(usb_persist_shutdown_handler) != ESP_OK) {
+        initialized = false;
+        return ESP_FAIL;
+    }
+
+    tinyusb_config_t tusb_cfg = {
+            .external_phy = false // In the most cases you need to use a `false` value
+    };
+    esp_err_t err = tinyusb_driver_install(&tusb_cfg);
+    if (err != ESP_OK) {
+        initialized = false;
+        return err;
+    }
+    xTaskCreate(usb_device_task, "usbd", 4096, NULL, configMAX_PRIORITIES - 1, NULL);
+    return err;
+}
+
+void usb_persist_restart(restart_type_t mode)
+{
+    if (usb_persist_enabled && mode < RESTART_TYPE_MAX) {
+        usb_persist_mode = mode;
+        esp_restart();
+    } else {
+        log_e("Persistence is not enabled");
+    }
+}
+
+uint8_t tinyusb_add_string_descriptor(const char * str){
+    if(str == NULL || tinyusb_string_descriptor_len >= MAX_STRING_DESCRIPTORS){
+        return 0;
+    }
+    uint8_t index = tinyusb_string_descriptor_len;
+    tinyusb_string_descriptor[tinyusb_string_descriptor_len++] = (char*)str;
+    return index;
+}
+
+uint8_t tinyusb_get_free_duplex_endpoint(void){
+    if(!tinyusb_has_available_fifos()){
+        log_e("No available IN endpoints");
+        return 0;
+    }
+    for(uint8_t i=1; i<7; i++){
+        if((tinyusb_endpoints.in & BIT(i)) == 0 && (tinyusb_endpoints.out & BIT(i)) == 0){
+            tinyusb_endpoints.in |= BIT(i);
+            tinyusb_endpoints.out |= BIT(i);
+            return i;
+        }
+    }
+    log_e("No available duplex endpoints");
+    return 0;
+}
+
+uint8_t tinyusb_get_free_in_endpoint(void){
+    if(!tinyusb_has_available_fifos()){
+        log_e("No available IN endpoints");
+        return 0;
+    }
+    for(uint8_t i=1; i<7; i++){
+        if((tinyusb_endpoints.in & BIT(i)) == 0 && (tinyusb_endpoints.out & BIT(i)) != 0){
+            tinyusb_endpoints.in |= BIT(i);
+            return i;
+        }
+    }
+    for(uint8_t i=1; i<7; i++){
+        if((tinyusb_endpoints.in & BIT(i)) == 0){
+            tinyusb_endpoints.in |= BIT(i);
+            return i;
+        }
+    }
+    return 0;
+}
+
+uint8_t tinyusb_get_free_out_endpoint(void){
+    for(uint8_t i=1; i<7; i++){
+        if((tinyusb_endpoints.out & BIT(i)) == 0 && (tinyusb_endpoints.in & BIT(i)) != 0){
+            tinyusb_endpoints.out |= BIT(i);
+            return i;
+        }
+    }
+    for(uint8_t i=1; i<7; i++){
+        if((tinyusb_endpoints.out & BIT(i)) == 0){
+            tinyusb_endpoints.out |= BIT(i);
+            return i;
+        }
+    }
+    return 0;
+}
+
+/*
+void usb_dw_reg_dump(void)
+{
+#define USB_PRINT_REG(r) printf("USB0." #r " = 0x%x;\n", USB0.r)
+#define USB_PRINT_IREG(i, r) printf("USB0.in_ep_reg[%u]." #r " = 0x%x;\n", i, USB0.in_ep_reg[i].r)
+#define USB_PRINT_OREG(i, r) printf("USB0.out_ep_reg[%u]." #r " = 0x%x;\n", i, USB0.out_ep_reg[i].r)
+    uint8_t i;
+    USB_PRINT_REG(gotgctl);
+    USB_PRINT_REG(gotgint);
+    USB_PRINT_REG(gahbcfg);
+    USB_PRINT_REG(gusbcfg);
+    USB_PRINT_REG(grstctl);
+    USB_PRINT_REG(gintsts);
+    USB_PRINT_REG(gintmsk);
+    USB_PRINT_REG(grxstsr);
+    USB_PRINT_REG(grxstsp);
+    USB_PRINT_REG(grxfsiz);
+    USB_PRINT_REG(gnptxsts);
+    USB_PRINT_REG(gpvndctl);
+    USB_PRINT_REG(ggpio);
+    USB_PRINT_REG(guid);
+    USB_PRINT_REG(gsnpsid);
+    USB_PRINT_REG(ghwcfg1);
+    USB_PRINT_REG(ghwcfg2);
+    USB_PRINT_REG(ghwcfg3);
+    USB_PRINT_REG(ghwcfg4);
+    USB_PRINT_REG(glpmcfg);
+    USB_PRINT_REG(gpwrdn);
+    USB_PRINT_REG(gdfifocfg);
+    USB_PRINT_REG(gadpctl);
+    USB_PRINT_REG(hptxfsiz);
+    USB_PRINT_REG(hcfg);
+    USB_PRINT_REG(hfir);
+    USB_PRINT_REG(hfnum);
+    USB_PRINT_REG(hptxsts);
+    USB_PRINT_REG(haint);
+    USB_PRINT_REG(haintmsk);
+    USB_PRINT_REG(hflbaddr);
+    USB_PRINT_REG(hprt);
+    USB_PRINT_REG(dcfg);
+    USB_PRINT_REG(dctl);
+    USB_PRINT_REG(dsts);
+    USB_PRINT_REG(diepmsk);
+    USB_PRINT_REG(doepmsk);
+    USB_PRINT_REG(daint);
+    USB_PRINT_REG(daintmsk);
+    USB_PRINT_REG(dtknqr1);
+    USB_PRINT_REG(dtknqr2);
+    USB_PRINT_REG(dvbusdis);
+    USB_PRINT_REG(dvbuspulse);
+    USB_PRINT_REG(dtknqr3_dthrctl);
+    USB_PRINT_REG(dtknqr4_fifoemptymsk);
+    USB_PRINT_REG(deachint);
+    USB_PRINT_REG(deachintmsk);
+    USB_PRINT_REG(pcgctrl);
+    USB_PRINT_REG(pcgctrl1);
+    USB_PRINT_REG(gnptxfsiz);
+    for (i = 0; i < 4; i++) {
+        printf("USB0.dieptxf[%u] = 0x%x;\n", i, USB0.dieptxf[i]);
+    }
+//    for (i = 0; i < 16; i++) {
+//        printf("USB0.diepeachintmsk[%u] = 0x%x;\n", i, USB0.diepeachintmsk[i]);
+//    }
+//    for (i = 0; i < 16; i++) {
+//        printf("USB0.doepeachintmsk[%u] = 0x%x;\n", i, USB0.doepeachintmsk[i]);
+//    }
+    for (i = 0; i < 7; i++) {
+        printf("// EP %u:\n", i);
+        USB_PRINT_IREG(i, diepctl);
+        USB_PRINT_IREG(i, diepint);
+        USB_PRINT_IREG(i, dieptsiz);
+        USB_PRINT_IREG(i, diepdma);
+        USB_PRINT_IREG(i, dtxfsts);
+        USB_PRINT_OREG(i, doepctl);
+        USB_PRINT_OREG(i, doepint);
+        USB_PRINT_OREG(i, doeptsiz);
+        USB_PRINT_OREG(i, doepdma);
+    }
+}
+ */
+#endif /* CONFIG_USB_ENABLED */

cores/esp32/esp32-hal-tinyusb.h

@@ -0,0 +1,103 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+
+#include "esp32-hal.h"
+
+#if CONFIG_IDF_TARGET_ESP32S2
+#if CONFIG_USB_ENABLED
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "tinyusb.h"
+
+typedef struct {
+        uint16_t vid;
+        uint16_t pid;
+        const char * product_name;
+        const char * manufacturer_name;
+        const char * serial_number;
+        uint16_t fw_version;
+        
+        uint16_t usb_version;
+        uint8_t usb_class;
+        uint8_t usb_subclass;
+        uint8_t usb_protocol;
+        uint8_t usb_attributes;
+        uint16_t usb_power_ma;
+        
+        bool webusb_enabled;
+        const char * webusb_url;
+} tinyusb_device_config_t;
+
+#define TINYUSB_CONFIG_DEFAULT() {                                      \
+        .vid = USB_ESPRESSIF_VID,                                       \
+        .pid = 0x0002,                                                  \
+        .product_name = CONFIG_USB_DESC_PRODUCT_STRING,                 \
+        .manufacturer_name = CONFIG_USB_DESC_MANUFACTURER_STRING,       \
+        .serial_number = CONFIG_USB_DESC_SERIAL_STRING,                 \
+        .fw_version = CONFIG_USB_DESC_BCDDEVICE,                        \
+        .usb_version = 0x0200,                                          \
+        .usb_class = TUSB_CLASS_MISC,                                   \
+        .usb_subclass = MISC_SUBCLASS_COMMON,                           \
+        .usb_protocol = MISC_PROTOCOL_IAD,                              \
+        .usb_attributes = TUSB_DESC_CONFIG_ATT_SELF_POWERED,            \
+        .usb_power_ma = 500,                                            \
+        .webusb_enabled = false,                                        \
+        .webusb_url = "espressif.github.io/arduino-esp32/webusb.html"   \
+}
+
+esp_err_t tinyusb_init(tinyusb_device_config_t *config);
+
+/*
+ * USB Persistence API
+ * */
+typedef enum {
+    RESTART_NO_PERSIST,
+    RESTART_PERSIST,
+    RESTART_BOOTLOADER,
+    RESTART_BOOTLOADER_DFU,
+    RESTART_TYPE_MAX
+} restart_type_t;
+
+void usb_persist_restart(restart_type_t mode);
+
+// The following definitions and functions are to be used only by the drivers
+typedef enum {
+    USB_INTERFACE_CDC,
+    USB_INTERFACE_DFU,
+    USB_INTERFACE_HID,
+    USB_INTERFACE_VENDOR,
+    USB_INTERFACE_MSC,
+    USB_INTERFACE_MIDI,
+    USB_INTERFACE_CUSTOM,
+    USB_INTERFACE_MAX
+} tinyusb_interface_t;
+
+typedef uint16_t (*tinyusb_descriptor_cb_t)(uint8_t * dst, uint8_t * itf);
+
+esp_err_t tinyusb_enable_interface(tinyusb_interface_t interface, uint16_t descriptor_len, tinyusb_descriptor_cb_t cb);
+uint8_t tinyusb_add_string_descriptor(const char * str);
+uint8_t tinyusb_get_free_duplex_endpoint(void);
+uint8_t tinyusb_get_free_in_endpoint(void);
+uint8_t tinyusb_get_free_out_endpoint(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_USB_ENABLED */
+#endif /* CONFIG_IDF_TARGET_ESP32S2 */

cores/esp32/esp32-hal-touch.c

@@ -0,0 +1,227 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal-touch.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_attr.h"
+#include "soc/rtc_io_reg.h"
+#include "soc/rtc_cntl_reg.h"
+#include "soc/sens_reg.h"
+#include "soc/sens_struct.h"
+#include "driver/touch_sensor.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/ets_sys.h"
+#include "esp_intr_alloc.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/ets_sys.h"
+#include "esp_intr_alloc.h"
+#include "soc/periph_defs.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/ets_sys.h"
+#include "esp_intr.h"
+#endif
+
+static uint16_t __touchSleepCycles = 0x1000;
+static uint16_t __touchMeasureCycles = 0x1000;
+
+typedef void (*voidFuncPtr)(void);
+static voidFuncPtr __touchInterruptHandlers[10] = {0,};
+static intr_handle_t touch_intr_handle = NULL;
+
+void ARDUINO_ISR_ATTR __touchISR(void * arg)
+{
+#if CONFIG_IDF_TARGET_ESP32
+    uint32_t pad_intr = READ_PERI_REG(SENS_SAR_TOUCH_CTRL2_REG) & 0x3ff;
+    uint32_t rtc_intr = READ_PERI_REG(RTC_CNTL_INT_ST_REG);
+    uint8_t i = 0;
+    //clear interrupt
+    WRITE_PERI_REG(RTC_CNTL_INT_CLR_REG, rtc_intr);
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_EN_CLR);
+
+    if (rtc_intr & RTC_CNTL_TOUCH_INT_ST) {
+        for (i = 0; i < 10; ++i) {
+            if ((pad_intr >> i) & 0x01) {
+                if(__touchInterruptHandlers[i]){
+                    __touchInterruptHandlers[i]();
+                }
+            }
+        }
+    }
+#endif
+}
+
+void __touchSetCycles(uint16_t measure, uint16_t sleep)
+{
+    __touchSleepCycles = sleep;
+    __touchMeasureCycles = measure;
+#if CONFIG_IDF_TARGET_ESP32
+    //Touch pad SleepCycle Time
+    SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_SLEEP_CYCLES, __touchSleepCycles, SENS_TOUCH_SLEEP_CYCLES_S);
+    //Touch Pad Measure Time
+    SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_MEAS_DELAY, __touchMeasureCycles, SENS_TOUCH_MEAS_DELAY_S);
+#else
+    touch_pad_set_meas_time(sleep, measure);
+#endif
+}
+
+void __touchInit()
+{
+    static bool initialized = false;
+    if(initialized){
+        return;
+    }
+    initialized = true;
+#if CONFIG_IDF_TARGET_ESP32
+    SET_PERI_REG_BITS(RTC_IO_TOUCH_CFG_REG, RTC_IO_TOUCH_XPD_BIAS, 1, RTC_IO_TOUCH_XPD_BIAS_S);
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_EN_CLR);
+    //clear touch enable
+    WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, 0x0);
+    __touchSetCycles(__touchMeasureCycles, __touchSleepCycles);
+    esp_intr_alloc(ETS_RTC_CORE_INTR_SOURCE, (int)ARDUINO_ISR_FLAG, __touchISR, NULL, &touch_intr_handle);
+#else
+    touch_pad_init();
+    touch_pad_set_voltage(TOUCH_HVOLT_2V7, TOUCH_LVOLT_0V5, TOUCH_HVOLT_ATTEN_0V5);
+    touch_pad_set_idle_channel_connect(TOUCH_PAD_CONN_GND);
+    __touchSetCycles(__touchMeasureCycles, __touchSleepCycles);
+    touch_pad_denoise_t denoise = {
+        .grade = TOUCH_PAD_DENOISE_BIT4,
+        .cap_level = TOUCH_PAD_DENOISE_CAP_L4,
+    };
+    touch_pad_denoise_set_config(&denoise);
+    touch_pad_denoise_enable();
+    touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
+    touch_pad_fsm_start();
+#endif
+}
+
+uint16_t __touchRead(uint8_t pin)
+{
+    int8_t pad = digitalPinToTouchChannel(pin);
+    if(pad < 0){
+        return 0;
+    }
+
+    pinMode(pin, ANALOG);
+
+    __touchInit();
+
+#if CONFIG_IDF_TARGET_ESP32
+    uint32_t v0 = READ_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG);
+    //Disable Intr & enable touch pad
+    WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG,
+            (v0 & ~((1 << (pad + SENS_TOUCH_PAD_OUTEN2_S)) | (1 << (pad + SENS_TOUCH_PAD_OUTEN1_S))))
+            | (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)));
+
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_ENABLE_REG, (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)));
+
+    uint32_t rtc_tio_reg = RTC_IO_TOUCH_PAD0_REG + pad * 4;
+    WRITE_PERI_REG(rtc_tio_reg, (READ_PERI_REG(rtc_tio_reg)
+                      & ~(RTC_IO_TOUCH_PAD0_DAC_M))
+                      | (7 << RTC_IO_TOUCH_PAD0_DAC_S)//Touch Set Slope
+                      | RTC_IO_TOUCH_PAD0_TIE_OPT_M   //Enable Tie,Init Level
+                      | RTC_IO_TOUCH_PAD0_START_M     //Enable Touch Pad IO
+                      | RTC_IO_TOUCH_PAD0_XPD_M);     //Enable Touch Pad Power on
+
+    //force oneTime test start
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M);
+
+    SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_XPD_WAIT, 10, SENS_TOUCH_XPD_WAIT_S);
+
+    while (GET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_DONE) == 0) {};
+
+    uint16_t touch_value = READ_PERI_REG(SENS_SAR_TOUCH_OUT1_REG + (pad / 2) * 4) >> ((pad & 1) ? SENS_TOUCH_MEAS_OUT1_S : SENS_TOUCH_MEAS_OUT0_S);
+
+    //clear touch force ,select the Touch mode is Timer
+    CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M);
+
+    //restore previous value
+    WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, v0);
+    return touch_value;
+#else
+    static uint32_t chan_mask = 0;
+    uint32_t value = 0;
+    if((chan_mask & (1 << pad)) == 0){
+        if(touch_pad_set_thresh((touch_pad_t)pad, TOUCH_PAD_THRESHOLD_MAX) != ESP_OK){
+        	log_e("touch_pad_set_thresh failed");
+        } else if(touch_pad_config((touch_pad_t)pad) != ESP_OK){
+        	log_e("touch_pad_config failed");
+        } else {
+        	chan_mask |= (1 << pad);
+        }
+    }
+    if((chan_mask & (1 << pad)) != 0) {
+        if(touch_pad_read_raw_data((touch_pad_t)pad, &value) != ESP_OK){
+        	log_e("touch_pad_read_raw_data failed");
+        }
+    }
+    return value;
+#endif
+}
+
+void __touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold)
+{
+    int8_t pad = digitalPinToTouchChannel(pin);
+    if(pad < 0){
+        return;
+    }
+
+    pinMode(pin, ANALOG);
+
+    __touchInit();
+
+    __touchInterruptHandlers[pad] = userFunc;
+
+#if CONFIG_IDF_TARGET_ESP32
+    //clear touch force ,select the Touch mode is Timer
+    CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M);
+
+    //interrupt when touch value < threshold
+    CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_SEL);
+    //Intr will give ,when SET0 < threshold
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_1EN);
+    //Enable Rtc Touch Module Intr,the Interrupt need Rtc out  Enable
+    SET_PERI_REG_MASK(RTC_CNTL_INT_ENA_REG, RTC_CNTL_TOUCH_INT_ENA);
+
+    //set threshold
+    uint8_t shift = (pad & 1) ? SENS_TOUCH_OUT_TH1_S : SENS_TOUCH_OUT_TH0_S;
+    SET_PERI_REG_BITS((SENS_SAR_TOUCH_THRES1_REG + (pad / 2) * 4), SENS_TOUCH_OUT_TH0, threshold, shift);
+
+    uint32_t rtc_tio_reg = RTC_IO_TOUCH_PAD0_REG + pad * 4;
+    WRITE_PERI_REG(rtc_tio_reg, (READ_PERI_REG(rtc_tio_reg)
+                      & ~(RTC_IO_TOUCH_PAD0_DAC_M))
+                      | (7 << RTC_IO_TOUCH_PAD0_DAC_S)//Touch Set Slope
+                      | RTC_IO_TOUCH_PAD0_TIE_OPT_M   //Enable Tie,Init Level
+                      | RTC_IO_TOUCH_PAD0_START_M     //Enable Touch Pad IO
+                      | RTC_IO_TOUCH_PAD0_XPD_M);     //Enable Touch Pad Power on
+
+    //Enable Digital rtc control :work mode and out mode
+    SET_PERI_REG_MASK(SENS_SAR_TOUCH_ENABLE_REG,
+                      (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)) | \
+                      (1 << (pad + SENS_TOUCH_PAD_OUTEN2_S)) | \
+                      (1 << (pad + SENS_TOUCH_PAD_OUTEN1_S)));
+#else
+
+#endif
+}
+
+extern uint16_t touchRead(uint8_t pin) __attribute__ ((weak, alias("__touchRead")));
+extern void touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold) __attribute__ ((weak, alias("__touchAttachInterrupt")));
+extern void touchSetCycles(uint16_t measure, uint16_t sleep) __attribute__ ((weak, alias("__touchSetCycles")));

cores/esp32/esp32-hal-touch.h

@@ -0,0 +1,56 @@
+/*
+ Arduino.h - Main include file for the Arduino SDK
+ Copyright (c) 2005-2013 Arduino Team.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef MAIN_ESP32_HAL_TOUCH_H_
+#define MAIN_ESP32_HAL_TOUCH_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "esp32-hal.h"
+
+/*
+ * Set cycles that measurement operation takes
+ * The result from touchRead, threshold and detection
+ * accuracy depend on these values. Defaults are
+ * 0x1000 for measure and 0x1000 for sleep.
+ * With default values touchRead takes 0.5ms
+ * */
+void touchSetCycles(uint16_t measure, uint16_t sleep);
+
+/*
+ * Read touch pad (values close to 0 mean touch detected)
+ * You can use this method to chose a good threshold value
+ * to use as value for touchAttachInterrupt
+ * */
+uint16_t touchRead(uint8_t pin);
+
+/*
+ * Set function to be called if touch pad value falls
+ * below the given threshold. Use touchRead to determine
+ * a proper threshold between touched and untouched state
+ * */
+void touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_TOUCH_H_ */

cores/esp32/esp32-hal-uart.c

@@ -0,0 +1,711 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp32-hal-uart.h"
+#include "esp32-hal.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/queue.h"
+#include "freertos/semphr.h"
+#include "esp_attr.h"
+#include "soc/uart_reg.h"
+#include "soc/uart_struct.h"
+#include "soc/io_mux_reg.h"
+#include "soc/gpio_sig_map.h"
+#include "soc/dport_reg.h"
+#include "soc/rtc.h"
+#include "esp_intr_alloc.h"
+
+#include "esp_system.h"
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/ets_sys.h"
+#include "esp32/rom/uart.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/ets_sys.h"
+#include "esp32s2/rom/uart.h"
+#include "soc/periph_defs.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/ets_sys.h"
+#include "rom/uart.h"
+#include "esp_intr.h"
+#endif
+
+#if CONFIG_IDF_TARGET_ESP32S2
+#define UART_PORTS_NUM 2
+#define UART_REG_BASE(u)    ((u==0)?DR_REG_UART_BASE:(      (u==1)?DR_REG_UART1_BASE:0))
+#define UART_RXD_IDX(u)     ((u==0)?U0RXD_IN_IDX:(          (u==1)?U1RXD_IN_IDX:0))
+#define UART_TXD_IDX(u)     ((u==0)?U0TXD_OUT_IDX:(         (u==1)?U1TXD_OUT_IDX:0))
+#define UART_INTR_SOURCE(u) ((u==0)?ETS_UART0_INTR_SOURCE:( (u==1)?ETS_UART1_INTR_SOURCE:0))
+#else
+#define UART_PORTS_NUM 3
+#define UART_REG_BASE(u)    ((u==0)?DR_REG_UART_BASE:(      (u==1)?DR_REG_UART1_BASE:(    (u==2)?DR_REG_UART2_BASE:0)))
+#define UART_RXD_IDX(u)     ((u==0)?U0RXD_IN_IDX:(          (u==1)?U1RXD_IN_IDX:(         (u==2)?U2RXD_IN_IDX:0)))
+#define UART_TXD_IDX(u)     ((u==0)?U0TXD_OUT_IDX:(         (u==1)?U1TXD_OUT_IDX:(        (u==2)?U2TXD_OUT_IDX:0)))
+#define UART_INTR_SOURCE(u) ((u==0)?ETS_UART0_INTR_SOURCE:( (u==1)?ETS_UART1_INTR_SOURCE:((u==2)?ETS_UART2_INTR_SOURCE:0)))
+#endif
+
+static int s_uart_debug_nr = 0;
+
+struct uart_struct_t {
+    uart_dev_t * dev;
+#if !CONFIG_DISABLE_HAL_LOCKS
+    xSemaphoreHandle lock;
+#endif
+    uint8_t num;
+    xQueueHandle queue;
+    intr_handle_t intr_handle;
+};
+
+#if CONFIG_DISABLE_HAL_LOCKS
+#define UART_MUTEX_LOCK()
+#define UART_MUTEX_UNLOCK()
+
+static uart_t _uart_bus_array[] = {
+    {&UART0, 0, NULL, NULL},
+    {&UART1, 1, NULL, NULL},
+#if CONFIG_IDF_TARGET_ESP32
+    {&UART2, 2, NULL, NULL}
+#endif
+};
+#else
+#define UART_MUTEX_LOCK()    do {} while (xSemaphoreTake(uart->lock, portMAX_DELAY) != pdPASS)
+#define UART_MUTEX_UNLOCK()  xSemaphoreGive(uart->lock)
+
+static uart_t _uart_bus_array[] = {
+    {&UART0, NULL, 0, NULL, NULL},
+    {&UART1, NULL, 1, NULL, NULL},
+#if CONFIG_IDF_TARGET_ESP32
+    {&UART2, NULL, 2, NULL, NULL}
+#endif
+};
+#endif
+
+static void uart_on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb);
+
+static void ARDUINO_ISR_ATTR _uart_isr(void *arg)
+{
+    uint8_t i, c;
+    BaseType_t xHigherPriorityTaskWoken;
+    uart_t* uart;
+
+    for(i=0;i<UART_PORTS_NUM;i++){
+        uart = &_uart_bus_array[i];
+        if(uart->intr_handle == NULL){
+            continue;
+        }
+        uart->dev->int_clr.rxfifo_full = 1;
+        uart->dev->int_clr.frm_err = 1;
+        uart->dev->int_clr.rxfifo_tout = 1;
+#if CONFIG_IDF_TARGET_ESP32
+        while(uart->dev->status.rxfifo_cnt || (uart->dev->mem_rx_status.wr_addr != uart->dev->mem_rx_status.rd_addr)) {
+            c = uart->dev->fifo.rw_byte;
+#else
+        uint32_t fifo_reg = UART_FIFO_AHB_REG(i);
+        while(uart->dev->status.rxfifo_cnt) {
+        	c = ESP_REG(fifo_reg);
+#endif
+            if(uart->queue != NULL)  {
+                xQueueSendFromISR(uart->queue, &c, &xHigherPriorityTaskWoken);
+            }
+        }
+    }
+
+    if (xHigherPriorityTaskWoken) {
+        portYIELD_FROM_ISR();
+    }
+}
+
+void uartEnableInterrupt(uart_t* uart)
+{
+    UART_MUTEX_LOCK();
+    uart->dev->conf1.rxfifo_full_thrhd = 112;
+#if CONFIG_IDF_TARGET_ESP32
+    uart->dev->conf1.rx_tout_thrhd = 2;
+#else
+    uart->dev->mem_conf.rx_tout_thrhd = 2;
+#endif
+    uart->dev->conf1.rx_tout_en = 1;
+    uart->dev->int_ena.rxfifo_full = 1;
+    uart->dev->int_ena.frm_err = 1;
+    uart->dev->int_ena.rxfifo_tout = 1;
+    uart->dev->int_clr.val = 0xffffffff;
+
+    esp_intr_alloc(UART_INTR_SOURCE(uart->num), (int)ARDUINO_ISR_FLAG, _uart_isr, NULL, &uart->intr_handle);
+    UART_MUTEX_UNLOCK();
+}
+
+void uartDisableInterrupt(uart_t* uart)
+{
+    UART_MUTEX_LOCK();
+    uart->dev->conf1.val = 0;
+    uart->dev->int_ena.val = 0;
+    uart->dev->int_clr.val = 0xffffffff;
+
+    esp_intr_free(uart->intr_handle);
+    uart->intr_handle = NULL;
+
+    UART_MUTEX_UNLOCK();
+}
+
+void uartDetachRx(uart_t* uart)
+{
+    if(uart == NULL) {
+        return;
+    }
+    pinMatrixInDetach(UART_RXD_IDX(uart->num), false, false);
+    uartDisableInterrupt(uart);
+}
+
+void uartDetachTx(uart_t* uart)
+{
+    if(uart == NULL) {
+        return;
+    }
+    pinMatrixOutDetach(UART_TXD_IDX(uart->num), false, false);
+}
+
+void uartAttachRx(uart_t* uart, uint8_t rxPin, bool inverted)
+{
+    if(uart == NULL || rxPin >= GPIO_PIN_COUNT) {
+        return;
+    }
+    pinMode(rxPin, INPUT);
+    pinMatrixInAttach(rxPin, UART_RXD_IDX(uart->num), inverted);
+    uartEnableInterrupt(uart);
+}
+
+void uartAttachTx(uart_t* uart, uint8_t txPin, bool inverted)
+{
+    if(uart == NULL || txPin >= GPIO_PIN_COUNT) {
+        return;
+    }
+    pinMode(txPin, OUTPUT);
+    pinMatrixOutAttach(txPin, UART_TXD_IDX(uart->num), inverted, false);
+}
+
+uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rxPin, int8_t txPin, uint16_t queueLen, bool inverted)
+{
+    if(uart_nr >= UART_PORTS_NUM) {
+        return NULL;
+    }
+
+    if(rxPin == -1 && txPin == -1) {
+        return NULL;
+    }
+
+    uart_t* uart = &_uart_bus_array[uart_nr];
+
+#if !CONFIG_DISABLE_HAL_LOCKS
+    if(uart->lock == NULL) {
+        uart->lock = xSemaphoreCreateMutex();
+        if(uart->lock == NULL) {
+            return NULL;
+        }
+    }
+#endif
+
+    if(queueLen && uart->queue == NULL) {
+        uart->queue = xQueueCreate(queueLen, sizeof(uint8_t)); //initialize the queue
+        if(uart->queue == NULL) {
+            return NULL;
+        }
+    }
+    if(uart_nr == 1){
+        DPORT_SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_UART1_CLK_EN);
+        DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_UART1_RST);
+#if CONFIG_IDF_TARGET_ESP32
+    } else if(uart_nr == 2){
+        DPORT_SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_UART2_CLK_EN);
+        DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_UART2_RST);
+#endif
+    } else {
+        DPORT_SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_UART_CLK_EN);
+        DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_UART_RST);
+    }
+    uartFlush(uart);
+    uartSetBaudRate(uart, baudrate);
+    UART_MUTEX_LOCK();
+    uart->dev->conf0.val = config;
+    #define TWO_STOP_BITS_CONF 0x3
+    #define ONE_STOP_BITS_CONF 0x1
+
+    if ( uart->dev->conf0.stop_bit_num == TWO_STOP_BITS_CONF) {
+        uart->dev->conf0.stop_bit_num = ONE_STOP_BITS_CONF;
+        uart->dev->rs485_conf.dl1_en = 1;
+    }
+
+    // tx_idle_num : idle interval after tx FIFO is empty(unit: the time it takes to send one bit under current baudrate)
+    // Setting it to 0 prevents line idle time/delays when sending messages with small intervals
+    uart->dev->idle_conf.tx_idle_num = 0;  //
+
+    UART_MUTEX_UNLOCK();
+
+    if(rxPin != -1) {
+        uartAttachRx(uart, rxPin, inverted);
+    }
+
+    if(txPin != -1) {
+        uartAttachTx(uart, txPin, inverted);
+    }
+    addApbChangeCallback(uart, uart_on_apb_change);
+    return uart;
+}
+
+void uartEnd(uart_t* uart)
+{
+    if(uart == NULL) {
+        return;
+    }
+    removeApbChangeCallback(uart, uart_on_apb_change);
+
+    UART_MUTEX_LOCK();
+    if(uart->queue != NULL) {
+        vQueueDelete(uart->queue);
+        uart->queue = NULL;
+    }
+
+    uart->dev->conf0.val = 0;
+
+    UART_MUTEX_UNLOCK();
+
+    uartDetachRx(uart);
+    uartDetachTx(uart);
+}
+
+size_t uartResizeRxBuffer(uart_t * uart, size_t new_size) {
+    if(uart == NULL) {
+        return 0;
+    }
+
+    UART_MUTEX_LOCK();
+    if(uart->queue != NULL) {
+        vQueueDelete(uart->queue);
+        uart->queue = xQueueCreate(new_size, sizeof(uint8_t));
+        if(uart->queue == NULL) {
+            return 0;
+        }
+    }
+    UART_MUTEX_UNLOCK();
+
+    return new_size;
+}
+
+uint32_t uartAvailable(uart_t* uart)
+{
+    if(uart == NULL || uart->queue == NULL) {
+        return 0;
+    }
+    return (uxQueueMessagesWaiting(uart->queue) + uart->dev->status.rxfifo_cnt) ;
+}
+
+uint32_t uartAvailableForWrite(uart_t* uart)
+{
+    if(uart == NULL) {
+        return 0;
+    }
+    return 0x7f - uart->dev->status.txfifo_cnt;
+}
+
+void uartRxFifoToQueue(uart_t* uart)
+{
+	uint8_t c;
+    UART_MUTEX_LOCK();
+	//disable interrupts
+	uart->dev->int_ena.val = 0;
+	uart->dev->int_clr.val = 0xffffffff;
+#if CONFIG_IDF_TARGET_ESP32
+	while (uart->dev->status.rxfifo_cnt || (uart->dev->mem_rx_status.wr_addr != uart->dev->mem_rx_status.rd_addr)) {
+		c = uart->dev->fifo.rw_byte;
+#else
+	uint32_t fifo_reg = UART_FIFO_AHB_REG(uart->num);
+	while (uart->dev->status.rxfifo_cnt) {
+		c = ESP_REG(fifo_reg);
+#endif
+		xQueueSend(uart->queue, &c, 0);
+	}
+	//enable interrupts
+	uart->dev->int_ena.rxfifo_full = 1;
+	uart->dev->int_ena.frm_err = 1;
+	uart->dev->int_ena.rxfifo_tout = 1;
+	uart->dev->int_clr.val = 0xffffffff;
+    UART_MUTEX_UNLOCK();
+}
+
+uint8_t uartRead(uart_t* uart)
+{
+    if(uart == NULL || uart->queue == NULL) {
+        return 0;
+    }
+    uint8_t c;
+    if ((uxQueueMessagesWaiting(uart->queue) == 0) && (uart->dev->status.rxfifo_cnt > 0))
+    {
+    	uartRxFifoToQueue(uart);
+    }
+    if(xQueueReceive(uart->queue, &c, 0)) {
+        return c;
+    }
+    return 0;
+}
+
+uint8_t uartPeek(uart_t* uart)
+{
+    if(uart == NULL || uart->queue == NULL) {
+        return 0;
+    }
+    uint8_t c;
+    if ((uxQueueMessagesWaiting(uart->queue) == 0) && (uart->dev->status.rxfifo_cnt > 0))
+    {
+    	uartRxFifoToQueue(uart);
+    }
+    if(xQueuePeek(uart->queue, &c, 0)) {
+        return c;
+    }
+    return 0;
+}
+
+void uartWrite(uart_t* uart, uint8_t c)
+{
+    if(uart == NULL) {
+        return;
+    }
+    UART_MUTEX_LOCK();
+    while(uart->dev->status.txfifo_cnt == 0x7F);
+#if CONFIG_IDF_TARGET_ESP32
+    uart->dev->fifo.rw_byte = c;
+#else
+    ESP_REG(UART_FIFO_AHB_REG(uart->num)) = c;
+#endif
+    UART_MUTEX_UNLOCK();
+}
+
+void uartWriteBuf(uart_t* uart, const uint8_t * data, size_t len)
+{
+    if(uart == NULL) {
+        return;
+    }
+    UART_MUTEX_LOCK();
+#ifndef CONFIG_IDF_TARGET_ESP32
+    uint32_t fifo_reg = UART_FIFO_AHB_REG(uart->num);
+#endif
+    while(len) {
+        while(uart->dev->status.txfifo_cnt == 0x7F);
+#if CONFIG_IDF_TARGET_ESP32
+        uart->dev->fifo.rw_byte = *data++;
+#else
+        ESP_REG(fifo_reg) = *data++;
+#endif
+        len--;
+    }
+    UART_MUTEX_UNLOCK();
+}
+
+void uartFlush(uart_t* uart)
+{
+    uartFlushTxOnly(uart,false);
+}
+
+void uartFlushTxOnly(uart_t* uart, bool txOnly)
+{
+    if(uart == NULL) {
+        return;
+    }
+
+    UART_MUTEX_LOCK();
+#if CONFIG_IDF_TARGET_ESP32
+    while(uart->dev->status.txfifo_cnt || uart->dev->status.st_utx_out);
+    
+    if( !txOnly ){
+        //Due to hardware issue, we can not use fifo_rst to reset uart fifo.
+        //See description about UART_TXFIFO_RST and UART_RXFIFO_RST in <<esp32_technical_reference_manual>> v2.6 or later.
+
+        // we read the data out and make `fifo_len == 0 && rd_addr == wr_addr`.
+        while(uart->dev->status.rxfifo_cnt != 0 || (uart->dev->mem_rx_status.wr_addr != uart->dev->mem_rx_status.rd_addr)) {
+            READ_PERI_REG(UART_FIFO_REG(uart->num));
+        }
+
+        xQueueReset(uart->queue);
+    }
+#else
+    while(uart->dev->status.txfifo_cnt);
+    uart->dev->conf0.txfifo_rst = 1;
+    uart->dev->conf0.txfifo_rst = 0;
+#endif
+    
+    UART_MUTEX_UNLOCK();
+}
+
+void uartSetBaudRate(uart_t* uart, uint32_t baud_rate)
+{
+    if(uart == NULL) {
+        return;
+    }
+    UART_MUTEX_LOCK();
+    uint32_t clk_div = ((getApbFrequency()<<4)/baud_rate);
+    uart->dev->clk_div.div_int = clk_div>>4 ;
+    uart->dev->clk_div.div_frag = clk_div & 0xf;
+    UART_MUTEX_UNLOCK();
+}
+
+static void uart_on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb)
+{
+    uart_t* uart = (uart_t*)arg;
+    if(ev_type == APB_BEFORE_CHANGE){
+        UART_MUTEX_LOCK();
+        //disabple interrupt
+        uart->dev->int_ena.val = 0;
+        uart->dev->int_clr.val = 0xffffffff;
+        // read RX fifo
+        uint8_t c;
+   //     BaseType_t xHigherPriorityTaskWoken;
+#if CONFIG_IDF_TARGET_ESP32
+        while(uart->dev->status.rxfifo_cnt != 0 || (uart->dev->mem_rx_status.wr_addr != uart->dev->mem_rx_status.rd_addr)) {
+            c = uart->dev->fifo.rw_byte;
+#else
+        uint32_t fifo_reg = UART_FIFO_AHB_REG(uart->num);
+        while(uart->dev->status.rxfifo_cnt != 0) {
+            c = ESP_REG(fifo_reg);
+#endif
+            if(uart->queue != NULL ) {
+                xQueueSend(uart->queue, &c, 1); //&xHigherPriorityTaskWoken);
+            }
+        }
+        UART_MUTEX_UNLOCK();
+ 
+        // wait TX empty
+#if CONFIG_IDF_TARGET_ESP32
+        while(uart->dev->status.txfifo_cnt || uart->dev->status.st_utx_out);
+#else
+        while(uart->dev->status.txfifo_cnt);
+#endif
+    } else {
+        //todo:
+        // set baudrate
+        UART_MUTEX_LOCK();
+        uint32_t clk_div = (uart->dev->clk_div.div_int << 4) | (uart->dev->clk_div.div_frag & 0x0F);
+        uint32_t baud_rate = ((old_apb<<4)/clk_div);
+        clk_div = ((new_apb<<4)/baud_rate);
+        uart->dev->clk_div.div_int = clk_div>>4 ;
+        uart->dev->clk_div.div_frag = clk_div & 0xf;
+        //enable interrupts
+        uart->dev->int_ena.rxfifo_full = 1;
+        uart->dev->int_ena.frm_err = 1;
+        uart->dev->int_ena.rxfifo_tout = 1;
+        uart->dev->int_clr.val = 0xffffffff;
+        UART_MUTEX_UNLOCK();
+    }
+}
+
+uint32_t uartGetBaudRate(uart_t* uart)
+{
+    if(uart == NULL) {
+        return 0;
+    }
+
+    uint32_t clk_div = (uart->dev->clk_div.div_int << 4) | (uart->dev->clk_div.div_frag & 0x0F);
+    if(!clk_div) {
+        return 0;
+    }
+
+    return ((getApbFrequency()<<4)/clk_div);
+}
+
+static void ARDUINO_ISR_ATTR uart0_write_char(char c)
+{
+#if CONFIG_IDF_TARGET_ESP32
+    while(((ESP_REG(0x01C+DR_REG_UART_BASE) >> UART_TXFIFO_CNT_S) & 0x7F) == 0x7F);
+    ESP_REG(DR_REG_UART_BASE) = c;
+#else
+    while(UART0.status.txfifo_cnt == 0x7F);
+    WRITE_PERI_REG(UART_FIFO_AHB_REG(0), c);
+#endif
+}
+
+static void ARDUINO_ISR_ATTR uart1_write_char(char c)
+{
+#if CONFIG_IDF_TARGET_ESP32
+    while(((ESP_REG(0x01C+DR_REG_UART1_BASE) >> UART_TXFIFO_CNT_S) & 0x7F) == 0x7F);
+    ESP_REG(DR_REG_UART1_BASE) = c;
+#else
+    while(UART1.status.txfifo_cnt == 0x7F);
+    WRITE_PERI_REG(UART_FIFO_AHB_REG(1), c);
+#endif
+}
+
+#if CONFIG_IDF_TARGET_ESP32
+static void ARDUINO_ISR_ATTR uart2_write_char(char c)
+{
+    while(((ESP_REG(0x01C+DR_REG_UART2_BASE) >> UART_TXFIFO_CNT_S) & 0x7F) == 0x7F);
+    ESP_REG(DR_REG_UART2_BASE) = c;
+}
+#endif
+
+void uart_install_putc()
+{
+    switch(s_uart_debug_nr) {
+    case 0:
+        ets_install_putc1((void (*)(char)) &uart0_write_char);
+        break;
+    case 1:
+        ets_install_putc1((void (*)(char)) &uart1_write_char);
+        break;
+#if CONFIG_IDF_TARGET_ESP32
+    case 2:
+        ets_install_putc1((void (*)(char)) &uart2_write_char);
+        break;
+#endif
+    default:
+        ets_install_putc1(NULL);
+        break;
+    }
+}
+
+void uartSetDebug(uart_t* uart)
+{
+    if(uart == NULL || uart->num >= UART_PORTS_NUM) {
+        s_uart_debug_nr = -1;
+        //ets_install_putc1(NULL);
+        //return;
+    } else
+    if(s_uart_debug_nr == uart->num) {
+        return;
+    } else
+    s_uart_debug_nr = uart->num;
+    uart_install_putc();
+}
+
+int uartGetDebug()
+{
+    return s_uart_debug_nr;
+}
+
+int log_printf(const char *format, ...)
+{
+    static char loc_buf[64];
+    char * temp = loc_buf;
+    int len;
+    va_list arg;
+    va_list copy;
+    va_start(arg, format);
+    va_copy(copy, arg);
+    len = vsnprintf(NULL, 0, format, arg);
+    va_end(copy);
+    if(len >= sizeof(loc_buf)){
+        temp = (char*)malloc(len+1);
+        if(temp == NULL) {
+            return 0;
+        }
+    }
+    vsnprintf(temp, len+1, format, arg);
+#if !CONFIG_DISABLE_HAL_LOCKS
+    if(s_uart_debug_nr != -1 && _uart_bus_array[s_uart_debug_nr].lock){
+        xSemaphoreTake(_uart_bus_array[s_uart_debug_nr].lock, portMAX_DELAY);
+        ets_printf("%s", temp);
+        xSemaphoreGive(_uart_bus_array[s_uart_debug_nr].lock);
+    } else {
+        ets_printf("%s", temp);
+    }
+#else
+    ets_printf("%s", temp);
+#endif
+    va_end(arg);
+    if(len >= sizeof(loc_buf)){
+        free(temp);
+    }
+    return len;
+}
+
+/*
+ * if enough pulses are detected return the minimum high pulse duration + minimum low pulse duration divided by two. 
+ * This equals one bit period. If flag is true the function return inmediately, otherwise it waits for enough pulses.
+ */
+unsigned long uartBaudrateDetect(uart_t *uart, bool flg)
+{
+    while(uart->dev->rxd_cnt.edge_cnt < 30) { // UART_PULSE_NUM(uart_num)
+        if(flg) return 0;
+        ets_delay_us(1000);
+    }
+
+    UART_MUTEX_LOCK();
+    unsigned long ret = ((uart->dev->lowpulse.min_cnt + uart->dev->highpulse.min_cnt) >> 1) + 12;
+    UART_MUTEX_UNLOCK();
+
+    return ret;
+}
+
+/*
+ * To start detection of baud rate with the uart the auto_baud.en bit needs to be cleared and set. The bit period is 
+ * detected calling uartBadrateDetect(). The raw baudrate is computed using the UART_CLK_FREQ. The raw baudrate is 
+ * rounded to the closed real baudrate.
+*/
+void uartStartDetectBaudrate(uart_t *uart) {
+  if(!uart) return;
+
+  uart->dev->auto_baud.glitch_filt = 0x08;
+  uart->dev->auto_baud.en = 0;
+  uart->dev->auto_baud.en = 1;
+}
+
+unsigned long
+uartDetectBaudrate(uart_t *uart)
+{
+    static bool uartStateDetectingBaudrate = false;
+
+    if(!uartStateDetectingBaudrate) {
+        uart->dev->auto_baud.glitch_filt = 0x08;
+        uart->dev->auto_baud.en = 0;
+        uart->dev->auto_baud.en = 1;
+        uartStateDetectingBaudrate = true;
+    }
+
+    unsigned long divisor = uartBaudrateDetect(uart, true);
+    if (!divisor) {
+        return 0;
+    }
+
+    uart->dev->auto_baud.en = 0;
+    uartStateDetectingBaudrate = false; // Initialize for the next round
+
+    unsigned long baudrate = getApbFrequency() / divisor;
+
+    static const unsigned long default_rates[] = {300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 74880, 115200, 230400, 256000, 460800, 921600, 1843200, 3686400};
+
+    size_t i;
+    for (i = 1; i < sizeof(default_rates) / sizeof(default_rates[0]) - 1; i++)	// find the nearest real baudrate
+    {
+        if (baudrate <= default_rates[i])
+        {
+            if (baudrate - default_rates[i - 1] < default_rates[i] - baudrate) {
+                i--;
+            }
+            break;
+        }
+    }
+
+    return default_rates[i];
+}
+
+/*
+ * Returns the status of the RX state machine, if the value is non-zero the state machine is active.
+ */
+bool uartRxActive(uart_t* uart) {
+#if CONFIG_IDF_TARGET_ESP32
+    return uart->dev->status.st_urx_out != 0;
+#else
+    return 0;
+#endif
+}

cores/esp32/esp32-hal-uart.h

@@ -0,0 +1,85 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MAIN_ESP32_HAL_UART_H_
+#define MAIN_ESP32_HAL_UART_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#define SERIAL_5N1 0x8000010
+#define SERIAL_6N1 0x8000014
+#define SERIAL_7N1 0x8000018
+#define SERIAL_8N1 0x800001c
+#define SERIAL_5N2 0x8000030
+#define SERIAL_6N2 0x8000034
+#define SERIAL_7N2 0x8000038
+#define SERIAL_8N2 0x800003c
+#define SERIAL_5E1 0x8000012
+#define SERIAL_6E1 0x8000016
+#define SERIAL_7E1 0x800001a
+#define SERIAL_8E1 0x800001e
+#define SERIAL_5E2 0x8000032
+#define SERIAL_6E2 0x8000036
+#define SERIAL_7E2 0x800003a
+#define SERIAL_8E2 0x800003e
+#define SERIAL_5O1 0x8000013
+#define SERIAL_6O1 0x8000017
+#define SERIAL_7O1 0x800001b
+#define SERIAL_8O1 0x800001f
+#define SERIAL_5O2 0x8000033
+#define SERIAL_6O2 0x8000037
+#define SERIAL_7O2 0x800003b
+#define SERIAL_8O2 0x800003f
+
+struct uart_struct_t;
+typedef struct uart_struct_t uart_t;
+
+uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rxPin, int8_t txPin, uint16_t queueLen, bool inverted);
+void uartEnd(uart_t* uart);
+
+uint32_t uartAvailable(uart_t* uart);
+uint32_t uartAvailableForWrite(uart_t* uart);
+uint8_t uartRead(uart_t* uart);
+uint8_t uartPeek(uart_t* uart);
+
+void uartWrite(uart_t* uart, uint8_t c);
+void uartWriteBuf(uart_t* uart, const uint8_t * data, size_t len);
+
+void uartFlush(uart_t* uart);
+void uartFlushTxOnly(uart_t* uart, bool txOnly );
+
+void uartSetBaudRate(uart_t* uart, uint32_t baud_rate);
+uint32_t uartGetBaudRate(uart_t* uart);
+
+size_t uartResizeRxBuffer(uart_t* uart, size_t new_size);
+
+void uartSetDebug(uart_t* uart);
+int uartGetDebug();
+
+void uartStartDetectBaudrate(uart_t *uart);
+unsigned long uartDetectBaudrate(uart_t *uart);
+
+bool uartRxActive(uart_t* uart);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MAIN_ESP32_HAL_UART_H_ */

cores/esp32/esp32-hal.h

@@ -0,0 +1,135 @@
+/*
+ Arduino.h - Main include file for the Arduino SDK
+ Copyright (c) 2005-2013 Arduino Team.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef HAL_ESP32_HAL_H_
+#define HAL_ESP32_HAL_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <inttypes.h>
+#include <string.h>
+#include <math.h>
+#include "sdkconfig.h"
+#include "esp_system.h"
+#include "esp_sleep.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef F_CPU
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#define F_CPU (CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ * 1000000U)
+#elif CONFIG_IDF_TARGET_ESP32S2
+#define F_CPU (CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ * 1000000U)
+#endif
+#endif
+
+#if CONFIG_ARDUINO_ISR_IRAM
+#define ARDUINO_ISR_ATTR IRAM_ATTR
+#define ARDUINO_ISR_FLAG ESP_INTR_FLAG_IRAM
+#else
+#define ARDUINO_ISR_ATTR
+#define ARDUINO_ISR_FLAG (0)
+#endif
+
+#ifndef ARDUINO_RUNNING_CORE
+#define ARDUINO_RUNNING_CORE CONFIG_ARDUINO_RUNNING_CORE
+#endif
+
+#ifndef ARDUINO_EVENT_RUNNING_CORE
+#define ARDUINO_EVENT_RUNNING_CORE CONFIG_ARDUINO_EVENT_RUNNING_CORE
+#endif
+
+//forward declaration from freertos/portmacro.h
+void vPortYield(void);
+void yield(void);
+#define optimistic_yield(u)
+
+#define ESP_REG(addr) *((volatile uint32_t *)(addr))
+#define NOP() asm volatile ("nop")
+
+#include "esp32-hal-log.h"
+#include "esp32-hal-matrix.h"
+#include "esp32-hal-uart.h"
+#include "esp32-hal-gpio.h"
+#include "esp32-hal-touch.h"
+#include "esp32-hal-dac.h"
+#include "esp32-hal-adc.h"
+#include "esp32-hal-spi.h"
+#include "esp32-hal-i2c.h"
+#include "esp32-hal-ledc.h"
+#include "esp32-hal-rmt.h"
+#include "esp32-hal-sigmadelta.h"
+#include "esp32-hal-timer.h"
+#include "esp32-hal-bt.h"
+#include "esp32-hal-psram.h"
+#include "esp32-hal-cpu.h"
+
+//returns chip temperature in Celsius
+float temperatureRead();
+
+#if CONFIG_AUTOSTART_ARDUINO
+//enable/disable WDT for Arduino's setup and loop functions
+void enableLoopWDT();
+void disableLoopWDT();
+//feed WDT for the loop task
+void feedLoopWDT();
+#endif
+
+//enable/disable WDT for the IDLE task on Core 0 (SYSTEM)
+void enableCore0WDT();
+void disableCore0WDT();
+#ifndef CONFIG_FREERTOS_UNICORE
+//enable/disable WDT for the IDLE task on Core 1 (Arduino)
+void enableCore1WDT();
+void disableCore1WDT();
+#endif
+
+//if xCoreID < 0 or CPU is unicore, it will use xTaskCreate, else xTaskCreatePinnedToCore
+//allows to easily handle all possible situations without repetitive code
+BaseType_t xTaskCreateUniversal( TaskFunction_t pxTaskCode,
+                        const char * const pcName,
+                        const uint32_t usStackDepth,
+                        void * const pvParameters,
+                        UBaseType_t uxPriority,
+                        TaskHandle_t * const pxCreatedTask,
+                        const BaseType_t xCoreID );
+
+unsigned long micros();
+unsigned long millis();
+void delay(uint32_t);
+void delayMicroseconds(uint32_t us);
+
+#if !CONFIG_ESP32_PHY_AUTO_INIT
+void arduino_phy_init();
+#endif
+
+#if !CONFIG_AUTOSTART_ARDUINO
+void initArduino();
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_ESP32_HAL_H_ */

cores/esp32/esp8266-compat.h

@@ -0,0 +1,24 @@
+// esp8266-compat.h - Compatibility functions to help ESP8266 libraries and user code run on ESP32
+
+// Copyright (c) 2017 Evandro Luis Copercini. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP8266_COMPAT_H_
+#define _ESP8266_COMPAT_H_
+
+#define ICACHE_FLASH_ATTR
+#define ICACHE_RAM_ATTR ARDUINO_ISR_ATTR
+
+
+#endif /* _ESP8266_COMPAT_H_ */

cores/esp32/libb64/AUTHORS

@@ -0,0 +1,7 @@
+libb64: Base64 Encoding/Decoding Routines
+======================================
+
+Authors:
+-------
+
+Chris Venter	chris.venter@gmail.com	http://rocketpod.blogspot.com

cores/esp32/libb64/LICENSE

@@ -0,0 +1,29 @@
+Copyright-Only Dedication (based on United States law) 
+or Public Domain Certification
+
+The person or persons who have associated work with this document (the
+"Dedicator" or "Certifier") hereby either (a) certifies that, to the best of
+his knowledge, the work of authorship identified is in the public domain of the
+country from which the work is published, or (b) hereby dedicates whatever
+copyright the dedicators holds in the work of authorship identified below (the
+"Work") to the public domain. A certifier, moreover, dedicates any copyright
+interest he may have in the associated work, and for these purposes, is
+described as a "dedicator" below.
+
+A certifier has taken reasonable steps to verify the copyright status of this
+work. Certifier recognizes that his good faith efforts may not shield him from
+liability if in fact the work certified is not in the public domain.
+
+Dedicator makes this dedication for the benefit of the public at large and to
+the detriment of the Dedicator's heirs and successors. Dedicator intends this
+dedication to be an overt act of relinquishment in perpetuity of all present
+and future rights under copyright law, whether vested or contingent, in the
+Work. Dedicator understands that such relinquishment of all rights includes
+the relinquishment of all rights to enforce (by lawsuit or otherwise) those
+copyrights in the Work.
+
+Dedicator recognizes that, once placed in the public domain, the Work may be
+freely reproduced, distributed, transmitted, used, modified, built upon, or
+otherwise exploited by anyone for any purpose, commercial or non-commercial,
+and in any way, including by methods that have not yet been invented or
+conceived.