Fixed warning

Fixes: https://github.com/espressif/arduino-esp32/issues/4530

.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 $PLATFORMIO_ESP32_URL > /dev/null 2>&1
+
+echo "Replacing the framework version ..."
+python -c "import json; import os; fp=open(os.path.expanduser('~/.platformio/platforms/espressif32/platform.json'), 'r+'); data=json.load(fp); data['packages']['framework-arduinoespressif32']['version'] = '*'; fp.seek(0); fp.truncate(); json.dump(data, fp); fp.close()"
+
+if [ "$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..HEAD" > "$OUTPUT_DIR/commits.txt"
+    releaseNotes+=$'\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 +13,7 @@ tools/mkspiffs/mkspiffs.exe
 .vs/
 __vm/
 *.vcxproj*
+.vscode/
+platform.sloeber.txt
+boards.sloeber.txt
+tools/mklittlefs

.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 +1,49 @@
+set(CORE_SRCS
+  cores/esp32/esp32-hal-adc.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-tinyusb.c
+  cores/esp32/esp32-hal-touch.c
+  cores/esp32/esp32-hal-rmt.c
+  cores/esp32/FunctionalInterrupt.cpp
+  cores/esp32/stdlib_noniso.c
+  cores/esp32/USB.cpp
+  cores/esp32/USBCDC.cpp
+  cores/esp32/wiring_pulse.c
+  cores/esp32/wiring_shift.c
+  cores/esp32/WMath.cpp
+  )
+
+set(LIBRARY_SRCS
+  libraries/SPI/src/SPI.cpp
+  libraries/Wire/src/Wire.cpp
+  )
+
+
+set(includedirs
+  variants/esp32/
+  cores/esp32/
+  libraries/SPI/src
+  libraries/Wire/src
+  )
+
+set(srcs ${CORE_SRCS} ${LIBRARY_SRCS} ${BLE_SRCS})
+set(requires spi_flash mbedtls esp_adc_cal wifi_provisioning)
+set(priv_requires nvs_flash bootloader_support tinyusb espcpputils fmt)
+
+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 +1,107 @@
+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 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
+
+config ARDUINO_SELECTIVE_COMPILATION
+    bool "Include only specific Arduino libraries"
+    default n
+
+config ARDUINO_SELECTIVE_FS
+    bool "Enable FS"
+    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_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
+to share and change it. By contrast, the GNU General Public Licenses
+are intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.
+
+This license, the Lesser General Public License, applies to some
+specially designated software packages--typically libraries--of the
+Free Software Foundation and other authors who decide to use it. You
+can use it too, but we suggest you first think carefully about whether
+this license or the ordinary General Public License is the better
+strategy to use in any particular case, based on the explanations
+below.
+
+When we speak of free software, we are referring to freedom of use,
+not price. Our General Public Licenses are designed to make sure that
+you have the freedom to distribute copies of free software (and charge
+for this service if you wish); that you receive source code or can get
+it if you want it; that you can change the software and use pieces of
+it in new free programs; and that you are informed that you can do
+these things.
+
+To protect your rights, we need to make restrictions that forbid
+distributors to deny you these rights or to ask you to surrender these
+rights. These restrictions translate to certain responsibilities for
+you if you distribute copies of the library or if you modify it.
+
+For example, if you distribute copies of the library, whether gratis
+or for a fee, you must give the recipients all the rights that we gave
+you. You must make sure that they, too, receive or can get the source
+code. If you link other code with the library, you must provide
+complete object files to the recipients, so that they can relink them
+with the library after making changes to the library and recompiling
+it. And you must show them these terms so they know their rights.
+
+We protect your rights with a two-step method: (1) we copyright the
+library, and (2) we offer you this license, which gives you legal
+permission to copy, distribute and/or modify the library.
+
+To protect each distributor, we want to make it very clear that there
+is no warranty for the free library. Also, if the library is modified
+by someone else and passed on, the recipients should know that what
+they have is not the original version, so that the original author's
+reputation will not be affected by problems that might be introduced
+by others.
+
+Finally, software patents pose a constant threat to the existence of
+any free program. We wish to make sure that a company cannot
+effectively restrict the users of a free program by obtaining a
+restrictive license from a patent holder. Therefore, we insist that
+any patent license obtained for a version of the library must be
+consistent with the full freedom of use specified in this license.
+
+Most GNU software, including some libraries, is covered by the
+ordinary GNU General Public License. This license, the GNU Lesser
+General Public License, applies to certain designated libraries, and
+is quite different from the ordinary General Public License. We use
+this license for certain libraries in order to permit linking those
+libraries into non-free programs.
+
+When a program is linked with a library, whether statically or using a
+shared library, the combination of the two is legally speaking a
+combined work, a derivative of the original library. The ordinary
+General Public License therefore permits such linking only if the
+entire combination fits its criteria of freedom. The Lesser General
+Public License permits more lax criteria for linking other code with
+the library.
+
+We call this license the "Lesser" General Public License because it
+does Less to protect the user's freedom than the ordinary General
+Public License. It also provides other free software developers Less
+of an advantage over competing non-free programs. These disadvantages
+are the reason we use the ordinary General Public License for many
+libraries. However, the Lesser license provides advantages in certain
+special circumstances.
+
+For example, on rare occasions, there may be a special need to
+encourage the widest possible use of a certain library, so that it
+becomes a de-facto standard. To achieve this, non-free programs must
+be allowed to use the library. A more frequent case is that a free
+library does the same job as widely used non-free libraries. In this
+case, there is little to gain by limiting the free library to free
+software only, so we use the Lesser General Public License.
+
+In other cases, permission to use a particular library in non-free
+programs enables a greater number of people to use a large body of
+free software. For example, permission to use the GNU C Library in
+non-free programs enables many more people to use the whole GNU
+operating system, as well as its variant, the GNU/Linux operating
+system.
+
+Although the Lesser General Public License is Less protective of the
+users' freedom, it does ensure that the user of a program that is
+linked with the Library has the freedom and the wherewithal to run
+that program using a modified version of the Library.
+
+The precise terms and conditions for copying, distribution and
+modification follow. Pay close attention to the difference between a
+"work based on the library" and a "work that uses the library". The
+former contains code derived from the library, whereas the latter must
+be combined with the library in order to run.
+
+### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+**0.** This License Agreement applies to any software library or other
+program which contains a notice placed by the copyright holder or
+other authorized party saying it may be distributed under the terms of
+this Lesser General Public License (also called "this License"). Each
+licensee is addressed as "you".
+
+A "library" means a collection of software functions and/or data
+prepared so as to be conveniently linked with application programs
+(which use some of those functions and data) to form executables.
+
+The "Library", below, refers to any such software library or work
+which has been distributed under these terms. A "work based on the
+Library" means either the Library or any derivative work under
+copyright law: that is to say, a work containing the Library or a
+portion of it, either verbatim or with modifications and/or translated
+straightforwardly into another language. (Hereinafter, translation is
+included without limitation in the term "modification".)
+
+"Source code" for a work means the preferred form of the work for
+making modifications to it. For a library, complete source code means
+all the source code for all modules it contains, plus any associated
+interface definition files, plus the scripts used to control
+compilation and installation of the library.
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running a program using the Library is not restricted, and output from
+such a program is covered only if its contents constitute a work based
+on the Library (independent of the use of the Library in a tool for
+writing it). Whether that is true depends on what the Library does and
+what the program that uses the Library does.
+
+**1.** You may copy and distribute verbatim copies of the Library's
+complete source code as you receive it, in any medium, provided that
+you conspicuously and appropriately publish on each copy an
+appropriate copyright notice and disclaimer of warranty; keep intact
+all the notices that refer to this License and to the absence of any
+warranty; and distribute a copy of this License along with the
+Library.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a
+fee.
+
+**2.** You may modify your copy or copies of the Library or any
+portion of it, thus forming a work based on the Library, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+-   **a)** The modified work must itself be a software library.
+-   **b)** You must cause the files modified to carry prominent
+    notices stating that you changed the files and the date of
+    any change.
+-   **c)** You must cause the whole of the work to be licensed at no
+    charge to all third parties under the terms of this License.
+-   **d)** If a facility in the modified Library refers to a function
+    or a table of data to be supplied by an application program that
+    uses the facility, other than as an argument passed when the
+    facility is invoked, then you must make a good faith effort to
+    ensure that, in the event an application does not supply such
+    function or table, the facility still operates, and performs
+    whatever part of its purpose remains meaningful.
+
+    (For example, a function in a library to compute square roots has
+    a purpose that is entirely well-defined independent of
+    the application. Therefore, Subsection 2d requires that any
+    application-supplied function or table used by this function must
+    be optional: if the application does not supply it, the square
+    root function must still compute square roots.)
+
+These requirements apply to the modified work as a whole. If
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+    Copyright (C) year  name of author
+
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+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+    Lesser General Public License for more details.
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+
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+
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+
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+    by James Random Hacker.
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+    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

README.md

@@ -11,9 +11,11 @@
 - [ESP32Dev Board PINMAP](#esp32dev-board-pinmap)
 
 ### Development Status
-[Latest stable release ![Release Version](https://img.shields.io/github/release/espressif/arduino-esp32.svg?style=plastic) ![Release Date](https://img.shields.io/github/release-date/espressif/arduino-esp32.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/) ![Downloads](https://img.shields.io/github/downloads/espressif/arduino-esp32/latest/total.svg?style=plastic)
 
-[Latest development release ![Development Version](https://img.shields.io/github/release/espressif/arduino-esp32/all.svg?style=plastic) ![Development Date](https://img.shields.io/github/release-date-pre/espressif/arduino-esp32.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/) ![Downloads](https://img.shields.io/github/downloads-pre/espressif/arduino-esp32/latest/total.svg?style=plastic)
+Latest Stable Release  [![Release Version](https://img.shields.io/github/release/espressif/arduino-esp32.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/) [![Release Date](https://img.shields.io/github/release-date/espressif/arduino-esp32.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/) [![Downloads](https://img.shields.io/github/downloads/espressif/arduino-esp32/latest/total.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/)
+
+Latest Development Release  [![Release Version](https://img.shields.io/github/release/espressif/arduino-esp32/all.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/) [![Release Date](https://img.shields.io/github/release-date-pre/espressif/arduino-esp32.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/) [![Downloads](https://img.shields.io/github/downloads-pre/espressif/arduino-esp32/latest/total.svg?style=plastic)](https://github.com/espressif/arduino-esp32/releases/latest/)
+
 
 ### Installation Instructions
 - Using Arduino IDE Boards Manager (preferred)

_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/FunctionalInterrupt.cpp

@@ -0,0 +1,44 @@
+/*
+ * FunctionalInterrupt.cpp
+ *
+ *  Created on: 8 jul. 2018
+ *      Author: Herman
+ */
+
+#include "FunctionalInterrupt.h"
+#include "esp32-hal.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/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){
+            vTaskDelay(1 / portTICK_PERIOD_MS);
+            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 +1,132 @@
+// 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 "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:
+    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/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 bool isAlphaNumeric(int c) __attribute__((always_inline));
+inline bool isAlpha(int c) __attribute__((always_inline));
+inline bool isAscii(int c) __attribute__((always_inline));
+inline bool isWhitespace(int c) __attribute__((always_inline));
+inline bool isControl(int c) __attribute__((always_inline));
+inline bool isDigit(int c) __attribute__((always_inline));
+inline bool isGraph(int c) __attribute__((always_inline));
+inline bool isLowerCase(int c) __attribute__((always_inline));
+inline bool isPrintable(int c) __attribute__((always_inline));
+inline bool isPunct(int c) __attribute__((always_inline));
+inline bool isSpace(int c) __attribute__((always_inline));
+inline bool isUpperCase(int c) __attribute__((always_inline));
+inline bool 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 bool isAlphaNumeric(int c)
+{
+    return (isalnum(c) == 0 ? false : true);
+}
+
+// Checks for an alphabetic character.
+// It is equivalent to (isupper(c) || islower(c)).
+inline bool 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 bool isAscii(int c)
+{
+    return ( isascii (c) == 0 ? false : true);
+}
+
+// Checks for a blank character, that is, a space or a tab.
+inline bool isWhitespace(int c)
+{
+    return (isblank(c) == 0 ? false : true);
+}
+
+// Checks for a control character.
+inline bool isControl(int c)
+{
+    return (iscntrl(c) == 0 ? false : true);
+}
+
+// Checks for a digit (0 through 9).
+inline bool isDigit(int c)
+{
+    return (isdigit(c) == 0 ? false : true);
+}
+
+// Checks for any printable character except space.
+inline bool isGraph(int c)
+{
+    return (isgraph(c) == 0 ? false : true);
+}
+
+// Checks for a lower-case character.
+inline bool isLowerCase(int c)
+{
+    return (islower(c) == 0 ? false : true);
+}
+
+// Checks for any printable character including space.
+inline bool isPrintable(int c)
+{
+    return (isprint(c) == 0 ? false : true);
+}
+
+// Checks for any printable character which is not a space
+// or an alphanumeric character.
+inline bool 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 bool isSpace(int c)
+{
+    return (isspace(c) == 0 ? false : true);
+}
+
+// Checks for an uppercase letter.
+inline bool 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 bool 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 +1,46 @@
+/* -*- 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 "esp_system.h"
+}
+
+//long map(long x, long in_min, long in_max, long out_min, long out_max) {
+//    const long dividend = out_max - out_min;
+//    const long divisor = in_max - in_min;
+//    const long delta = x - in_min;
+
+//    return (delta * dividend + (divisor / 2)) / 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/esp32-hal-adc.c

@@ -0,0 +1,281 @@
+// 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 "esp32-hal-log.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
+#include "esp32-hal-gpio.h"
+
+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(adc_vref_to_gpio(ADC_UNIT_2, __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 +1,105 @@
+/*
+ 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 <stdint.h>
+#include <stdbool.h>
+//#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-cpu.c

@@ -0,0 +1,246 @@
+// 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 "esp32-hal-log.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 SemaphoreHandle_t 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",(unsigned int)c->cb,(unsigned int)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",(unsigned int)cb,(unsigned int)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 +1,60 @@
+// 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
+
+#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
+
+#define clockCyclesPerMicrosecond() ( (long int)getCpuFrequencyMhz() )
+#define clockCyclesToMicroseconds(a) ( (a) / clockCyclesPerMicrosecond() )
+#define microsecondsToClockCycles(a) ( (a) * clockCyclesPerMicrosecond() )
+
+#endif /* _ESP32_HAL_CPU_H_ */

cores/esp32/esp32-hal-dac.c

@@ -0,0 +1,57 @@
+// 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"
+#include "esp32-hal-gpio.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 +1,33 @@
+/*
+ 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
+
+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 +1,392 @@
+// 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 "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 "soc/rtc_io_periph.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 "stdint.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 +1,319 @@
+// 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 "esp32-hal-log.h"
+#include "soc/dport_reg.h"
+#include "soc/ledc_reg.h"
+#include "soc/ledc_struct.h"
+#include "esp32-hal-cpu.h"
+#include "esp32-hal-gpio.h"
+#include "esp32-hal-ledc.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)
+SemaphoreHandle_t _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 +1,136 @@
+// 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.
+#ifndef __ARDUHAL_LOG_H__
+#define __ARDUHAL_LOG_H__
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "sdkconfig.h"
+#include "esp_timer.h"
+#include "esp_log.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
+
+#if CONFIG_LOG_LOCATION
+#define ARDUHAL_LOG_FORMAT(letter, format) format
+#else
+#define ARDUHAL_LOG_FORMAT(letter, format)  "[%s:%u] %s(): " format, (__builtin_strrchr(__FILE__, '/') ? __builtin_strrchr(__FILE__, '/') + 1 : __FILE__), __LINE__, __FUNCTION__
+#endif
+
+#define ARDUHAL_LOG_TAG "ARDUINO"
+
+#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_VERBOSE
+#define log_v(format, ...) ESP_LOGV(ARDUHAL_LOG_TAG, ARDUHAL_LOG_FORMAT(V, format), ##__VA_ARGS__)
+#define isr_log_v(format, ...) ESP_LOGV(ARDUHAL_LOG_TAG, 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, ...) ESP_LOGD(ARDUHAL_LOG_TAG, ARDUHAL_LOG_FORMAT(D, format), ##__VA_ARGS__)
+#define isr_log_d(format, ...) ESP_LOGD(ARDUHAL_LOG_TAG, 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, ...) ESP_LOGI(ARDUHAL_LOG_TAG, ARDUHAL_LOG_FORMAT(I, format), ##__VA_ARGS__)
+#define isr_log_i(format, ...) ESP_LOGI(ARDUHAL_LOG_TAG, 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, ...) ESP_LOGW(ARDUHAL_LOG_TAG, ARDUHAL_LOG_FORMAT(W, format), ##__VA_ARGS__)
+#define isr_log_w(format, ...) ESP_LOGW(ARDUHAL_LOG_TAG, 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, ...) ESP_LOGE(ARDUHAL_LOG_TAG, ARDUHAL_LOG_FORMAT(E, format), ##__VA_ARGS__)
+#define isr_log_e(format, ...) ESP_LOGE(ARDUHAL_LOG_TAG, 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, ...) ESP_LOGE(ARDUHAL_LOG_TAG, ARDUHAL_LOG_FORMAT(E, format), ##__VA_ARGS__)
+#define isr_log_n(format, ...) ESP_LOGE(ARDUHAL_LOG_TAG, ARDUHAL_LOG_FORMAT(E, format), ##__VA_ARGS__)
+#else
+#define log_n(format, ...)
+#define isr_log_n(format, ...)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ESP_LOGGING_H__ */

cores/esp32/esp32-hal-matrix.c

@@ -0,0 +1,60 @@
+// 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 "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/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 +1,36 @@
+// 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 <stdint.h>
+#include <stdbool.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 +1,84 @@
+// 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 "esp32-hal-misc.h"
+#include "esp32-hal.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_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 "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")));
+
+unsigned long ARDUINO_ISR_ATTR micros()
+{
+    return (unsigned long) (esp_timer_get_time());
+}
+
+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();
+        }
+    }
+}
+

cores/esp32/esp32-hal-misc.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void yield(void);
+
+unsigned long micros();
+void delayMicroseconds(uint32_t us);
+
+#ifdef __cplusplus
+}
+#endif

cores/esp32/esp32-hal-psram.c

@@ -0,0 +1,138 @@
+// 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 <stdbool.h>
+#include <stddef.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;
+    }
+#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 +1,878 @@
+// 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 "esp32-hal-log.h"
+#include "esp8266-compat.h"
+#include "soc/gpio_reg.h"
+#include "soc/rmt_struct.h"
+#include <esp_private/periph_ctrl.h>
+#include "esp_intr_alloc.h"
+#include "hal/rmt_ll.h"
+#include "driver/rmt.h"
+#include "esp32-hal-rmt.h"
+#include "esp32-hal-gpio.h"
+#include "esp32-hal-matrix.h"
+
+// RMTMEM address is declared in <target>.peripherals.ld
+extern rmt_mem_t RMTMEM;
+
+/**
+ * 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;
+    void * arg;
+};
+
+/**
+ * Internal variables for channel descriptors
+ */
+static SemaphoreHandle_t 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, NULL},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false, NULL},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false, NULL},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false, NULL},
+#if CONFIG_IDF_TARGET_ESP32
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false, NULL},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false, NULL},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false, NULL},
+    { false, NULL, 0, 0, 0, 0, 0, NULL, E_NO_INTR, E_INACTIVE, NULL, false, NULL},
+#endif
+};
+
+/**
+ * Internal variables for driver data
+ */
+static  intr_handle_t intr_handle;
+
+static bool periph_enabled = false;
+
+static SemaphoreHandle_t 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, void * arg)
+{
+    if (!rmt && !cb) {
+        return false;
+    }
+    int channel = rmt->channel;
+
+    RMT_MUTEX_LOCK(channel);
+    rmt->arg = arg;
+    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 rmtEnd(rmt_obj_t* rmt) {
+    if (!rmt) {
+        return false;
+    }
+    int channel = rmt->channel;
+
+    RMT_MUTEX_LOCK(channel);
+    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;
+    rmt->arg = NULL;
+
+    _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), g_rmt_objects[ch].arg);
+
+                        // 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 uint32_t* data = &RMTMEM.chan[channel].data32->val;
+    int idx;
+    for(idx = 0; idx < item_block_len; idx++) {
+        rmt_item32_t helper;
+        helper.val = data[idx];
+
+        if(helper.duration0 == 0) {
+            return idx;
+        } else if(helper.duration1 == 0) {
+            return idx + 1;
+        }
+    }
+    return idx;
+}

cores/esp32/esp32-hal-rmt.h

@@ -0,0 +1,152 @@
+// 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, void *arg);
+
+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, void * arg);
+
+/***
+ * Ends async receive started with rmtRead(); but does not
+ * rmtDeInit().
+ */
+bool rmtEnd(rmt_obj_t* rmt);
+
+/*  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 +1,133 @@
+// 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 "freertos/semphr.h"
+#include "esp32-hal-cpu.h"
+#include "esp32-hal-gpio.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)
+SemaphoreHandle_t _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 clockDiv, 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-tinyusb.c

@@ -0,0 +1,697 @@
+
+#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"
+#include "esp32s2/rom/usb/usb_dc.h"
+#include "esp32s2/rom/usb/chip_usb_dw_wrapper.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) {
+            usb_dc_prepare_persist();
+        }
+        if (usb_persist_mode == RESTART_BOOTLOADER) {
+            //USB CDC Download
+            if (usb_persist_enabled) {
+                chip_usb_set_persist_flags(USBDC_PERSIST_ENA);
+            }
+            REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
+        } else if (usb_persist_mode == RESTART_BOOTLOADER_DFU) {
+            //DFU Download
+            chip_usb_set_persist_flags(USBDC_BOOT_DFU);
+            REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
+        } else if (usb_persist_enabled) {
+            //USB Persist reboot
+            chip_usb_set_persist_flags(USBDC_PERSIST_ENA);
+        }
+    }
+}
+
+// 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 (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 (mode < RESTART_TYPE_MAX) {
+        usb_persist_mode = mode;
+        esp_restart();
+    }
+}
+
+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 +1,229 @@
+// 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 "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
+#include "esp32-hal-gpio.h"
+
+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 <stdint.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.h

@@ -0,0 +1,75 @@
+/*
+ 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
+
+#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
+
+////forward declaration from freertos/portmacro.h
+//void vPortYield(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-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-psram.h"
+////#include "esp32-hal-cpu.h"
+
+////returns chip temperature in Celsius
+//float temperatureRead();
+
+//#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/esp_arduino_version.h

@@ -0,0 +1,46 @@
+// Copyright 2019 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
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Major version number (X.x.x) */
+#define ESP_ARDUINO_VERSION_MAJOR   2
+/** Minor version number (x.X.x) */
+#define ESP_ARDUINO_VERSION_MINOR   0
+/** Patch version number (x.x.X) */
+#define ESP_ARDUINO_VERSION_PATCH   0
+
+/**
+ * Macro to convert ARDUINO version number into an integer
+ *
+ * To be used in comparisons, such as ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(2, 0, 0)
+ */
+#define ESP_ARDUINO_VERSION_VAL(major, minor, patch) ((major << 16) | (minor << 8) | (patch))
+
+/**
+ * Current ARDUINO version, as an integer
+ *
+ * To be used in comparisons, such as ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(2, 0, 0)
+ */
+#define ESP_ARDUINO_VERSION  ESP_ARDUINO_VERSION_VAL(ESP_ARDUINO_VERSION_MAJOR, \
+                                             ESP_ARDUINO_VERSION_MINOR, \
+                                             ESP_ARDUINO_VERSION_PATCH)
+
+#ifdef __cplusplus
+}
+#endif

cores/esp32/pgmspace.h

@@ -0,0 +1,89 @@
+/* 
+  Copyright (c) 2015 Hristo Gochkov. All rights reserved.
+  This file is part of the RaspberryPi 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 PGMSPACE_INCLUDE
+#define PGMSPACE_INCLUDE
+
+typedef void prog_void;
+typedef char prog_char;
+typedef unsigned char prog_uchar;
+typedef char prog_int8_t;
+typedef unsigned char prog_uint8_t;
+typedef short prog_int16_t;
+typedef unsigned short prog_uint16_t;
+typedef long prog_int32_t;
+typedef unsigned long prog_uint32_t;
+
+#define PROGMEM
+#define PGM_P         const char *
+#define PGM_VOID_P    const void *
+#define PSTR(s)       (s)
+#define _SFR_BYTE(n)  (n)
+
+#define pgm_read_byte(addr)   (*(const unsigned char *)(addr))
+#define pgm_read_word(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const unsigned short *)(_addr); \
+})
+#define pgm_read_dword(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const unsigned long *)(_addr); \
+})
+#define pgm_read_float(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const float *)(_addr); \
+})
+#define pgm_read_ptr(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(void * const *)(_addr); \
+})
+
+#define pgm_get_far_address(x) ((uint32_t)(&(x)))
+
+#define pgm_read_byte_near(addr)  pgm_read_byte(addr)
+#define pgm_read_word_near(addr)  pgm_read_word(addr)
+#define pgm_read_dword_near(addr) pgm_read_dword(addr)
+#define pgm_read_float_near(addr) pgm_read_float(addr)
+#define pgm_read_ptr_near(addr)   pgm_read_ptr(addr)
+#define pgm_read_byte_far(addr)   pgm_read_byte(addr)
+#define pgm_read_word_far(addr)   pgm_read_word(addr)
+#define pgm_read_dword_far(addr)  pgm_read_dword(addr)
+#define pgm_read_float_far(addr)  pgm_read_float(addr)
+#define pgm_read_ptr_far(addr)    pgm_read_ptr(addr)
+
+#define memcmp_P      memcmp
+#define memccpy_P     memccpy
+#define memmem_P      memmem
+#define memcpy_P      memcpy
+#define strcpy_P      strcpy
+#define strncpy_P     strncpy
+#define strcat_P      strcat
+#define strncat_P     strncat
+#define strcmp_P      strcmp
+#define strncmp_P     strncmp
+#define strcasecmp_P  strcasecmp
+#define strncasecmp_P strncasecmp
+#define strlen_P      strlen
+#define strnlen_P     strnlen
+#define strstr_P      strstr
+#define printf_P      printf
+#define sprintf_P     sprintf
+#define snprintf_P    snprintf
+#define vsnprintf_P   vsnprintf
+
+#endif

cores/esp32/stdlib_noniso.c

@@ -0,0 +1,161 @@
+/*
+ core_esp8266_noniso.c - nonstandard (but usefull) conversion functions
+
+ 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
+
+ Modified 03 April 2015 by Markus Sattler
+
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <math.h>
+#include "stdlib_noniso.h"
+
+void reverse(char* begin, char* end) {
+    char *is = begin;
+    char *ie = end - 1;
+    while(is < ie) {
+        char tmp = *ie;
+        *ie = *is;
+        *is = tmp;
+        ++is;
+        --ie;
+    }
+}
+
+char* ltoa(long value, char* result, int base) {
+    if(base < 2 || base > 16) {
+        *result = 0;
+        return result;
+    }
+
+    char* out = result;
+    long quotient = abs(value);
+
+    do {
+        const long tmp = quotient / base;
+        *out = "0123456789abcdef"[quotient - (tmp * base)];
+        ++out;
+        quotient = tmp;
+    } while(quotient);
+
+    // Apply negative sign
+    if(value < 0)
+        *out++ = '-';
+
+    reverse(result, out);
+    *out = 0;
+    return result;
+}
+
+char* ultoa(unsigned long value, char* result, int base) {
+    if(base < 2 || base > 16) {
+        *result = 0;
+        return result;
+    }
+
+    char* out = result;
+    unsigned long quotient = value;
+
+    do {
+        const unsigned long tmp = quotient / base;
+        *out = "0123456789abcdef"[quotient - (tmp * base)];
+        ++out;
+        quotient = tmp;
+    } while(quotient);
+
+    reverse(result, out);
+    *out = 0;
+    return result;
+}
+
+char * dtostrf(double number, signed char width, unsigned char prec, char *s) {
+    bool negative = false;
+
+    if (isnan(number)) {
+        strcpy(s, "nan");
+        return s;
+    }
+    if (isinf(number)) {
+        strcpy(s, "inf");
+        return s;
+    }
+
+    char* out = s;
+
+    int fillme = width; // how many cells to fill for the integer part
+    if (prec > 0) {
+        fillme -= (prec+1);
+    }
+
+    // Handle negative numbers
+    if (number < 0.0) {
+        negative = true;
+        fillme--;
+        number = -number;
+    }
+
+    // Round correctly so that print(1.999, 2) prints as "2.00"
+    // I optimized out most of the divisions
+    double rounding = 2.0;
+    for (uint8_t i = 0; i < prec; ++i)
+        rounding *= 10.0;
+    rounding = 1.0 / rounding;
+
+    number += rounding;
+
+    // Figure out how big our number really is
+    double tenpow = 1.0;
+    int digitcount = 1;
+    while (number >= 10.0 * tenpow) {
+        tenpow *= 10.0;
+        digitcount++;
+    }
+
+    number /= tenpow;
+    fillme -= digitcount;
+
+    // Pad unused cells with spaces
+    while (fillme-- > 0) {
+        *out++ = ' ';
+    }
+
+    // Handle negative sign
+    if (negative) *out++ = '-';
+
+    // Print the digits, and if necessary, the decimal point
+    digitcount += prec;
+    int8_t digit = 0;
+    while (digitcount-- > 0) {
+        digit = (int8_t)number;
+        if (digit > 9) digit = 9; // insurance
+        *out++ = (char)('0' | digit);
+        if ((digitcount == prec) && (prec > 0)) {
+            *out++ = '.';
+        }
+        number -= digit;
+        number *= 10.0;
+    }
+
+    // make sure the string is terminated
+    *out = 0;
+    return s;
+}

cores/esp32/stdlib_noniso.h

@@ -0,0 +1,49 @@
+/*
+  stdlib_noniso.h - nonstandard (but usefull) conversion functions
+
+  Copyright (c) 2014 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 STDLIB_NONISO_H
+#define STDLIB_NONISO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int atoi(const char *s);
+
+long atol(const char* s);
+
+double atof(const char* s);
+
+char* itoa (int val, char *s, int radix);
+
+char* ltoa (long val, char *s, int radix);
+
+char* utoa (unsigned int val, char *s, int radix);
+
+char* ultoa (unsigned long val, char *s, int radix);
+
+char* dtostrf (double val, signed char width, unsigned char prec, char *s);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+
+#endif

cores/esp32/wiring_private.h

@@ -0,0 +1,43 @@
+/*
+ wiring_private.h - Internal header file.
+ Part of Arduino - http://www.arduino.cc/
+
+ Copyright (c) 2005-2006 David A. Mellis
+
+ 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: wiring.h 239 2007-01-12 17:58:39Z mellis $
+ */
+
+#ifndef WiringPrivate_h
+#define WiringPrivate_h
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void (*voidFuncPtr)(void);
+
+void initPins();
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif

cores/esp32/wiring_pulse.c

@@ -0,0 +1,50 @@
+/*
+  pulse.c - wiring pulseIn implementation for esp8266
+  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 <limits.h>
+#include "wiring_private.h"
+#include "pins_arduino.h"
+
+
+extern uint32_t xthal_get_ccount();
+
+#define WAIT_FOR_PIN_STATE(state) \
+    while (digitalRead(pin) != (state)) { \
+        if (xthal_get_ccount() - start_cycle_count > timeout_cycles) { \
+            return 0; \
+        } \
+    }
+
+// max timeout is 27 seconds at 160MHz clock and 54 seconds at 80MHz clock
+//unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout)
+//{
+//    const uint32_t max_timeout_us = clockCyclesToMicroseconds(UINT_MAX);
+//    if (timeout > max_timeout_us) {
+//        timeout = max_timeout_us;
+//    }
+//    const uint32_t timeout_cycles = microsecondsToClockCycles(timeout);
+//    const uint32_t start_cycle_count = xthal_get_ccount();
+//    WAIT_FOR_PIN_STATE(!state);
+//    WAIT_FOR_PIN_STATE(state);
+//    const uint32_t pulse_start_cycle_count = xthal_get_ccount();
+//    WAIT_FOR_PIN_STATE(!state);
+//    return clockCyclesToMicroseconds(xthal_get_ccount() - pulse_start_cycle_count);
+//}
+
+//unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout)
+//{
+//    return pulseIn(pin, state, timeout);
+//}

cores/esp32/wiring_shift.c

@@ -0,0 +1,53 @@
+/*
+ wiring_shift.c - shiftOut() function
+ Part of Arduino - http://www.arduino.cc/
+ Copyright (c) 2005-2006 David A. Mellis
+ 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: wiring.c 248 2007-02-03 15:36:30Z mellis $
+ */
+
+#include "wiring_shift.h"
+#include "esp32-hal.h"
+#include "wiring_private.h"
+#include "esp32-hal-gpio.h"
+
+uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {
+    uint8_t value = 0;
+    uint8_t i;
+
+    for(i = 0; i < 8; ++i) {
+        //digitalWrite(clockPin, HIGH);
+        if(bitOrder == LSBFIRST)
+            value |= digitalRead(dataPin) << i;
+        else
+            value |= digitalRead(dataPin) << (7 - i);
+        digitalWrite(clockPin, HIGH);
+        digitalWrite(clockPin, LOW);
+    }
+    return value;
+}
+
+void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val) {
+    uint8_t i;
+
+    for(i = 0; i < 8; i++) {
+        if(bitOrder == LSBFIRST)
+            digitalWrite(dataPin, !!(val & (1 << i)));
+        else
+            digitalWrite(dataPin, !!(val & (1 << (7 - i))));
+
+        digitalWrite(clockPin, HIGH);
+        digitalWrite(clockPin, LOW);
+    }
+}

cores/esp32/wiring_shift.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#define LSBFIRST 0
+#define MSBFIRST 1
+
+#include <stdint.h>
+
+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);

docs/ISSUE_TEMPLATE.md

@@ -1,26 +1,28 @@
 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)
+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)  
 Then if someone is interested and knowledgeable you might get a answer.  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
+[ExceptionDecoder](https://github.com/me-no-dev/EspExceptionDecoder)
 
 ----------------------------- Remove above -----------------------------
 
 
 ### Hardware:
-Board:							?ESP32 Dev Module? ?node32? ?ttgo_lora?
-Core Installation/update date:			?11/jul/2017?
-IDE name:							?Arduino IDE? ?Platform.io? ?IDF component?
-Flash Frequency:					?40Mhz?
-PSRAM enabled:                                          ?no?
-Upload Speed:						?115200?
-Computer OS:                                            ?Windows 10? ?Mac OSX? ?Ubuntu?
+|||||||
+|:---|---|---|---|---|---|
+|<B>Board</B>|ESP32 Dev Module|node32|ttgo_lora|ESP32-S2-Saola|Custom w/ ESP32-S2-WROVER 16MB|
+|<B>Version/Date</B>|1.0.4|2.0.0|0badbeef|11/jul/2017|today's master|
+|<B>IDE name</B>|Arduino IDE|Atom + Platform.io|IDF component|VSCode|
+|<B>Flash Frequency</B>|40Mhz|80Mhz|
+|<B>PSRAM enabled</B>|yes|no|
+|<B>Upload Speed</B>|115200|
+|<B>Computer OS</B>|Windows 10|Mac OSX|Ubuntu|
 
 ### Description:
 Describe your problem here

docs/arduino-ide/boards_manager.md

@@ -4,7 +4,7 @@
 - Stable release link: `https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json`
 - Development release link: `https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json`
 
-Starting with 1.6.4, Arduino allows installation of third-party platform packages using Boards Manager. We have packages available for Windows, Mac OS, and Linux (32, 64 bit and ARM).
+Starting with 1.6.4, Arduino allows installation of third-party platform packages using Boards Manager. We have packages available for Windows, Mac OS, and Linux (x86, amd64, armhf and arm64).
 
 - Install the current upstream Arduino IDE at the 1.8 level or later. The current version is at the [Arduino website](http://www.arduino.cc/en/main/software).
 - Start Arduino and open Preferences window.

docs/arduino-ide/mac.md

@@ -7,9 +7,9 @@ Installation instructions for Mac OS
   ```bash
   mkdir -p ~/Documents/Arduino/hardware/espressif && \
   cd ~/Documents/Arduino/hardware/espressif && \
-  git clone https://github.com/espressif/arduino-esp32.git esp32 && \
+  git clone https://github.com/espressif/arduino-esp32.git esp32 --depth 1 && \
   cd esp32 && \
-  git submodule update --init --recursive && \
+  git submodule update --init --recursive --depth 1 && \
   cd tools && \
   python get.py 
   ```

docs/esp-idf_component.md

@@ -1,6 +1,10 @@
 To use as a component of ESP-IDF
 =================================================
 
+## esp32-arduino-lib-builder
+
+For a simplified method, see [lib-builder](lib_builder.md)
+
 ## Installation
 
 - Download and install [esp-idf](https://github.com/espressif/esp-idf)
@@ -68,6 +72,11 @@ If you are writing code that does not require Arduino to compile and you want yo
 #endif
 ```
 
+## FreeRTOS Tick Rate (Hz)
+
+You might notice that Arduino-esp32's `delay()` function will only work in multiples of 10ms. That is because, by default, esp-idf handles task events 100 times per second.
+To fix that behavior you need to set FreeRTOS tick rate to 1000Hz in `make menuconfig` -> `Component config` -> `FreeRTOS` -> `Tick rate`.
+
 ## Compilation Errors
 
 As commits are made to esp-idf and submodules, the codebases can develop incompatibilities which cause compilation errors.  If you have problems compiling, follow the instructions in [Issue #1142](https://github.com/espressif/arduino-esp32/issues/1142) to roll esp-idf back to a known good version.

docs/lib_builder.md

@@ -0,0 +1,14 @@
+## Using esp32-arduino-lib-builder to compile custom libraries
+
+Espressif has provided a [tool](https://github.com/espressif/esp32-arduino-lib-builder) to simplify building your own compiled libraries for use in Arduino IDE (or your favorite IDE).
+To use it to generate custom libraries, follow these steps:
+1. `git clone https://github.com/espressif/esp32-arduino-lib-builder`
+2. `cd esp32-arduino-lib-builder`
+3. `./tools/update-components.sh`
+4. `./tools/install-esp-idf.sh` (if you already have an $IDF_PATH defined, it will use your local copy of the repository)
+5. `make menuconfig` or directly edit sdkconfig.
+6. `./build.sh`
+
+The script automates the process of building [arduino as an ESP-IDF component](https://github.com/espressif/arduino-esp32/blob/master/docs/esp-idf_component.md).
+Once it is complete, you can cherry pick the needed libraries from `out/tools/sdk/lib`, or run `tools/copy-to-arduino.sh` to copy the entire built system.
+`tools/config.sh` contains a number of variables that control the process, particularly the $IDF_BRANCH variable.  You can adjust this to try building against newer versions, but there are absolutely no guarantees that any components will work or even successfully compile against a newer IDF.

libraries/ESP32/examples/AnalogOut/LEDCSoftwareFade/LEDCSoftwareFade.ino

@@ -0,0 +1,57 @@
+/*
+ LEDC Software Fade
+
+ This example shows how to software fade LED
+ using the ledcWrite function.
+
+ Code adapted from original Arduino Fade example:
+ https://www.arduino.cc/en/Tutorial/Fade
+
+ This example code is in the public domain.
+ */
+
+// use first channel of 16 channels (started from zero)
+#define LEDC_CHANNEL_0     0
+
+// use 13 bit precission for LEDC timer
+#define LEDC_TIMER_13_BIT  13
+
+// use 5000 Hz as a LEDC base frequency
+#define LEDC_BASE_FREQ     5000
+
+// fade LED PIN (replace with LED_BUILTIN constant for built-in LED)
+#define LED_PIN            5
+
+int brightness = 0;    // how bright the LED is
+int fadeAmount = 5;    // how many points to fade the LED by
+
+// Arduino like analogWrite
+// value has to be between 0 and valueMax
+void ledcAnalogWrite(uint8_t channel, uint32_t value, uint32_t valueMax = 255) {
+  // calculate duty, 8191 from 2 ^ 13 - 1
+  uint32_t duty = (8191 / valueMax) * min(value, valueMax);
+
+  // write duty to LEDC
+  ledcWrite(channel, duty);
+}
+
+void setup() {
+  // Setup timer and attach timer to a led pin
+  ledcSetup(LEDC_CHANNEL_0, LEDC_BASE_FREQ, LEDC_TIMER_13_BIT);
+  ledcAttachPin(LED_PIN, LEDC_CHANNEL_0);
+}
+
+void loop() {
+  // set the brightness on LEDC channel 0
+  ledcAnalogWrite(LEDC_CHANNEL_0, brightness);
+
+  // change the brightness for next time through the loop:
+  brightness = brightness + fadeAmount;
+
+  // reverse the direction of the fading at the ends of the fade:
+  if (brightness <= 0 || brightness >= 255) {
+    fadeAmount = -fadeAmount;
+  }
+  // wait for 30 milliseconds to see the dimming effect
+  delay(30);
+}

libraries/ESP32/examples/AnalogOut/SigmaDelta/SigmaDelta.ino

@@ -0,0 +1,18 @@
+void setup()
+{
+    //setup channel 0 with frequency 312500 Hz
+    sigmaDeltaSetup(0, 312500);
+    //attach pin 18 to channel 0
+    sigmaDeltaAttachPin(18,0);
+    //initialize channel 0 to off
+    sigmaDeltaWrite(0, 0);
+}
+
+void loop()
+{
+    //slowly ramp-up the value
+    //will overflow at 256
+    static uint8_t i = 0;
+    sigmaDeltaWrite(0, i++);
+    delay(100);
+}

libraries/ESP32/examples/AnalogOut/ledcWrite_RGB/ledcWrite_RGB.ino

@@ -0,0 +1,130 @@
+/*
+  ledcWrite_RGB.ino
+  Runs through the full 255 color spectrum for an rgb led 
+  Demonstrate ledcWrite functionality for driving leds with PWM on ESP32
+ 
+  This example code is in the public domain.
+  
+  Some basic modifications were made by vseven, mostly commenting.
+ */
+ 
+// Set up the rgb led names
+uint8_t ledR = A4;
+uint8_t ledG = A5;
+uint8_t ledB = A18; 
+
+uint8_t ledArray[3] = {1, 2, 3}; // three led channels
+
+const boolean invert = true; // set true if common anode, false if common cathode
+
+uint8_t color = 0;          // a value from 0 to 255 representing the hue
+uint32_t R, G, B;           // the Red Green and Blue color components
+uint8_t brightness = 255;  // 255 is maximum brightness, but can be changed.  Might need 256 for common anode to fully turn off.
+
+// the setup routine runs once when you press reset:
+void setup() 
+{            
+  Serial.begin(115200);
+  delay(10); 
+  
+  ledcAttachPin(ledR, 1); // assign RGB led pins to channels
+  ledcAttachPin(ledG, 2);
+  ledcAttachPin(ledB, 3);
+  
+  // Initialize channels 
+  // channels 0-15, resolution 1-16 bits, freq limits depend on resolution
+  // ledcSetup(uint8_t channel, uint32_t freq, uint8_t resolution_bits);
+  ledcSetup(1, 12000, 8); // 12 kHz PWM, 8-bit resolution
+  ledcSetup(2, 12000, 8);
+  ledcSetup(3, 12000, 8);
+}
+
+// void loop runs over and over again
+void loop() 
+{
+  Serial.println("Send all LEDs a 255 and wait 2 seconds.");
+  // If your RGB LED turns off instead of on here you should check if the LED is common anode or cathode.
+  // If it doesn't fully turn off and is common anode try using 256.
+  ledcWrite(1, 255);
+  ledcWrite(2, 255);
+  ledcWrite(3, 255);
+  delay(2000);
+  Serial.println("Send all LEDs a 0 and wait 2 seconds.");
+  ledcWrite(1, 0);
+  ledcWrite(2, 0);
+  ledcWrite(3, 0);
+  delay(2000);
+ 
+  Serial.println("Starting color fade loop.");
+  
+ for (color = 0; color < 255; color++) { // Slew through the color spectrum
+
+  hueToRGB(color, brightness);  // call function to convert hue to RGB
+
+  // write the RGB values to the pins
+  ledcWrite(1, R); // write red component to channel 1, etc.
+  ledcWrite(2, G);   
+  ledcWrite(3, B); 
+ 
+  delay(100); // full cycle of rgb over 256 colors takes 26 seconds
+ }
+ 
+}
+
+// Courtesy http://www.instructables.com/id/How-to-Use-an-RGB-LED/?ALLSTEPS
+// function to convert a color to its Red, Green, and Blue components.
+
+void hueToRGB(uint8_t hue, uint8_t brightness)
+{
+    uint16_t scaledHue = (hue * 6);
+    uint8_t segment = scaledHue / 256; // segment 0 to 5 around the
+                                            // color wheel
+    uint16_t segmentOffset =
+      scaledHue - (segment * 256); // position within the segment
+
+    uint8_t complement = 0;
+    uint16_t prev = (brightness * ( 255 -  segmentOffset)) / 256;
+    uint16_t next = (brightness *  segmentOffset) / 256;
+
+    if(invert)
+    {
+      brightness = 255 - brightness;
+      complement = 255;
+      prev = 255 - prev;
+      next = 255 - next;
+    }
+
+    switch(segment ) {
+    case 0:      // red
+        R = brightness;
+        G = next;
+        B = complement;
+    break;
+    case 1:     // yellow
+        R = prev;
+        G = brightness;
+        B = complement;
+    break;
+    case 2:     // green
+        R = complement;
+        G = brightness;
+        B = next;
+    break;
+    case 3:    // cyan
+        R = complement;
+        G = prev;
+        B = brightness;
+    break;
+    case 4:    // blue
+        R = next;
+        G = complement;
+        B = brightness;
+    break;
+   case 5:      // magenta
+    default:
+        R = brightness;
+        G = complement;
+        B = prev;
+    break;
+    }
+}

libraries/ESP32/examples/Camera/CameraWebServer/CameraWebServer.ino

@@ -0,0 +1,118 @@
+//Disable Example for now
+#if 0
+#include "esp_camera.h"
+#include <WiFi.h>
+
+//
+// WARNING!!! PSRAM IC required for UXGA resolution and high JPEG quality
+//            Ensure ESP32 Wrover Module or other board with PSRAM is selected
+//            Partial images will be transmitted if image exceeds buffer size
+//
+
+// Select camera model
+#define CAMERA_MODEL_WROVER_KIT // Has PSRAM
+//#define CAMERA_MODEL_ESP_EYE // Has PSRAM
+//#define CAMERA_MODEL_M5STACK_PSRAM // Has PSRAM
+//#define CAMERA_MODEL_M5STACK_V2_PSRAM // M5Camera version B Has PSRAM
+//#define CAMERA_MODEL_M5STACK_WIDE // Has PSRAM
+//#define CAMERA_MODEL_M5STACK_ESP32CAM // No PSRAM
+//#define CAMERA_MODEL_AI_THINKER // Has PSRAM
+//#define CAMERA_MODEL_TTGO_T_JOURNAL // No PSRAM
+
+#include "camera_pins.h"
+
+const char* ssid = "*********";
+const char* password = "*********";
+
+void startCameraServer();
+
+void setup() {
+  Serial.begin(115200);
+  Serial.setDebugOutput(true);
+  Serial.println();
+
+  camera_config_t config;
+  config.ledc_channel = LEDC_CHANNEL_0;
+  config.ledc_timer = LEDC_TIMER_0;
+  config.pin_d0 = Y2_GPIO_NUM;
+  config.pin_d1 = Y3_GPIO_NUM;
+  config.pin_d2 = Y4_GPIO_NUM;
+  config.pin_d3 = Y5_GPIO_NUM;
+  config.pin_d4 = Y6_GPIO_NUM;
+  config.pin_d5 = Y7_GPIO_NUM;
+  config.pin_d6 = Y8_GPIO_NUM;
+  config.pin_d7 = Y9_GPIO_NUM;
+  config.pin_xclk = XCLK_GPIO_NUM;
+  config.pin_pclk = PCLK_GPIO_NUM;
+  config.pin_vsync = VSYNC_GPIO_NUM;
+  config.pin_href = HREF_GPIO_NUM;
+  config.pin_sscb_sda = SIOD_GPIO_NUM;
+  config.pin_sscb_scl = SIOC_GPIO_NUM;
+  config.pin_pwdn = PWDN_GPIO_NUM;
+  config.pin_reset = RESET_GPIO_NUM;
+  config.xclk_freq_hz = 20000000;
+  config.pixel_format = PIXFORMAT_JPEG;
+  
+  // if PSRAM IC present, init with UXGA resolution and higher JPEG quality
+  //                      for larger pre-allocated frame buffer.
+  if(psramFound()){
+    config.frame_size = FRAMESIZE_UXGA;
+    config.jpeg_quality = 10;
+    config.fb_count = 2;
+  } else {
+    config.frame_size = FRAMESIZE_SVGA;
+    config.jpeg_quality = 12;
+    config.fb_count = 1;
+  }
+
+#if defined(CAMERA_MODEL_ESP_EYE)
+  pinMode(13, INPUT_PULLUP);
+  pinMode(14, INPUT_PULLUP);
+#endif
+
+  // camera init
+  esp_err_t err = esp_camera_init(&config);
+  if (err != ESP_OK) {
+    Serial.printf("Camera init failed with error 0x%x", err);
+    return;
+  }
+
+  sensor_t * s = esp_camera_sensor_get();
+  // initial sensors are flipped vertically and colors are a bit saturated
+  if (s->id.PID == OV3660_PID) {
+    s->set_vflip(s, 1); // flip it back
+    s->set_brightness(s, 1); // up the brightness just a bit
+    s->set_saturation(s, -2); // lower the saturation
+  }
+  // drop down frame size for higher initial frame rate
+  s->set_framesize(s, FRAMESIZE_QVGA);
+
+#if defined(CAMERA_MODEL_M5STACK_WIDE) || defined(CAMERA_MODEL_M5STACK_ESP32CAM)
+  s->set_vflip(s, 1);
+  s->set_hmirror(s, 1);
+#endif
+
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println("");
+  Serial.println("WiFi connected");
+
+  startCameraServer();
+
+  Serial.print("Camera Ready! Use 'http://");
+  Serial.print(WiFi.localIP());
+  Serial.println("' to connect");
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  delay(10000);
+}
+#else
+void setup(){}
+void loop(){}
+#endif

libraries/ESP32/examples/Camera/CameraWebServer/app_httpd.cpp

@@ -0,0 +1,664 @@
+// 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.
+#if 0
+#include "esp_http_server.h"
+#include "esp_timer.h"
+#include "esp_camera.h"
+#include "img_converters.h"
+#include "camera_index.h"
+#include "Arduino.h"
+
+#include "fb_gfx.h"
+#include "fd_forward.h"
+#include "fr_forward.h"
+
+#define ENROLL_CONFIRM_TIMES 5
+#define FACE_ID_SAVE_NUMBER 7
+
+#define FACE_COLOR_WHITE  0x00FFFFFF
+#define FACE_COLOR_BLACK  0x00000000
+#define FACE_COLOR_RED    0x000000FF
+#define FACE_COLOR_GREEN  0x0000FF00
+#define FACE_COLOR_BLUE   0x00FF0000
+#define FACE_COLOR_YELLOW (FACE_COLOR_RED | FACE_COLOR_GREEN)
+#define FACE_COLOR_CYAN   (FACE_COLOR_BLUE | FACE_COLOR_GREEN)
+#define FACE_COLOR_PURPLE (FACE_COLOR_BLUE | FACE_COLOR_RED)
+
+typedef struct {
+        size_t size; //number of values used for filtering
+        size_t index; //current value index
+        size_t count; //value count
+        int sum;
+        int * values; //array to be filled with values
+} ra_filter_t;
+
+typedef struct {
+        httpd_req_t *req;
+        size_t len;
+} jpg_chunking_t;
+
+#define PART_BOUNDARY "123456789000000000000987654321"
+static const char* _STREAM_CONTENT_TYPE = "multipart/x-mixed-replace;boundary=" PART_BOUNDARY;
+static const char* _STREAM_BOUNDARY = "\r\n--" PART_BOUNDARY "\r\n";
+static const char* _STREAM_PART = "Content-Type: image/jpeg\r\nContent-Length: %u\r\n\r\n";
+
+static ra_filter_t ra_filter;
+httpd_handle_t stream_httpd = NULL;
+httpd_handle_t camera_httpd = NULL;
+
+static mtmn_config_t mtmn_config;
+static int8_t detection_enabled = 0;
+static int8_t recognition_enabled = 0;
+static int8_t is_enrolling = 0;
+static face_id_list id_list;
+
+static ra_filter_t * ra_filter_init(ra_filter_t * filter, size_t sample_size){
+    memset(filter, 0, sizeof(ra_filter_t));
+
+    filter->values = (int *)malloc(sample_size * sizeof(int));
+    if(!filter->values){
+        return NULL;
+    }
+    memset(filter->values, 0, sample_size * sizeof(int));
+
+    filter->size = sample_size;
+    return filter;
+}
+
+static int ra_filter_run(ra_filter_t * filter, int value){
+    if(!filter->values){
+        return value;
+    }
+    filter->sum -= filter->values[filter->index];
+    filter->values[filter->index] = value;
+    filter->sum += filter->values[filter->index];
+    filter->index++;
+    filter->index = filter->index % filter->size;
+    if (filter->count < filter->size) {
+        filter->count++;
+    }
+    return filter->sum / filter->count;
+}
+
+static void rgb_print(dl_matrix3du_t *image_matrix, uint32_t color, const char * str){
+    fb_data_t fb;
+    fb.width = image_matrix->w;
+    fb.height = image_matrix->h;
+    fb.data = image_matrix->item;
+    fb.bytes_per_pixel = 3;
+    fb.format = FB_BGR888;
+    fb_gfx_print(&fb, (fb.width - (strlen(str) * 14)) / 2, 10, color, str);
+}
+
+static int rgb_printf(dl_matrix3du_t *image_matrix, uint32_t color, const char *format, ...){
+    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(loc_buf, sizeof(loc_buf), 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);
+    va_end(arg);
+    rgb_print(image_matrix, color, temp);
+    if(len > 64){
+        free(temp);
+    }
+    return len;
+}
+
+static void draw_face_boxes(dl_matrix3du_t *image_matrix, box_array_t *boxes, int face_id){
+    int x, y, w, h, i;
+    uint32_t color = FACE_COLOR_YELLOW;
+    if(face_id < 0){
+        color = FACE_COLOR_RED;
+    } else if(face_id > 0){
+        color = FACE_COLOR_GREEN;
+    }
+    fb_data_t fb;
+    fb.width = image_matrix->w;
+    fb.height = image_matrix->h;
+    fb.data = image_matrix->item;
+    fb.bytes_per_pixel = 3;
+    fb.format = FB_BGR888;
+    for (i = 0; i < boxes->len; i++){
+        // rectangle box
+        x = (int)boxes->box[i].box_p[0];
+        y = (int)boxes->box[i].box_p[1];
+        w = (int)boxes->box[i].box_p[2] - x + 1;
+        h = (int)boxes->box[i].box_p[3] - y + 1;
+        fb_gfx_drawFastHLine(&fb, x, y, w, color);
+        fb_gfx_drawFastHLine(&fb, x, y+h-1, w, color);
+        fb_gfx_drawFastVLine(&fb, x, y, h, color);
+        fb_gfx_drawFastVLine(&fb, x+w-1, y, h, color);
+#if 0
+        // landmark
+        int x0, y0, j;
+        for (j = 0; j < 10; j+=2) {
+            x0 = (int)boxes->landmark[i].landmark_p[j];
+            y0 = (int)boxes->landmark[i].landmark_p[j+1];
+            fb_gfx_fillRect(&fb, x0, y0, 3, 3, color);
+        }
+#endif
+    }
+}
+
+static int run_face_recognition(dl_matrix3du_t *image_matrix, box_array_t *net_boxes){
+    dl_matrix3du_t *aligned_face = NULL;
+    int matched_id = 0;
+
+    aligned_face = dl_matrix3du_alloc(1, FACE_WIDTH, FACE_HEIGHT, 3);
+    if(!aligned_face){
+        Serial.println("Could not allocate face recognition buffer");
+        return matched_id;
+    }
+    if (align_face(net_boxes, image_matrix, aligned_face) == ESP_OK){
+        if (is_enrolling == 1){
+            int8_t left_sample_face = enroll_face(&id_list, aligned_face);
+
+            if(left_sample_face == (ENROLL_CONFIRM_TIMES - 1)){
+                Serial.printf("Enrolling Face ID: %d\n", id_list.tail);
+            }
+            Serial.printf("Enrolling Face ID: %d sample %d\n", id_list.tail, ENROLL_CONFIRM_TIMES - left_sample_face);
+            rgb_printf(image_matrix, FACE_COLOR_CYAN, "ID[%u] Sample[%u]", id_list.tail, ENROLL_CONFIRM_TIMES - left_sample_face);
+            if (left_sample_face == 0){
+                is_enrolling = 0;
+                Serial.printf("Enrolled Face ID: %d\n", id_list.tail);
+            }
+        } else {
+            matched_id = recognize_face(&id_list, aligned_face);
+            if (matched_id >= 0) {
+                Serial.printf("Match Face ID: %u\n", matched_id);
+                rgb_printf(image_matrix, FACE_COLOR_GREEN, "Hello Subject %u", matched_id);
+            } else {
+                Serial.println("No Match Found");
+                rgb_print(image_matrix, FACE_COLOR_RED, "Intruder Alert!");
+                matched_id = -1;
+            }
+        }
+    } else {
+        Serial.println("Face Not Aligned");
+        //rgb_print(image_matrix, FACE_COLOR_YELLOW, "Human Detected");
+    }
+
+    dl_matrix3du_free(aligned_face);
+    return matched_id;
+}
+
+static size_t jpg_encode_stream(void * arg, size_t index, const void* data, size_t len){
+    jpg_chunking_t *j = (jpg_chunking_t *)arg;
+    if(!index){
+        j->len = 0;
+    }
+    if(httpd_resp_send_chunk(j->req, (const char *)data, len) != ESP_OK){
+        return 0;
+    }
+    j->len += len;
+    return len;
+}
+
+static esp_err_t capture_handler(httpd_req_t *req){
+    camera_fb_t * fb = NULL;
+    esp_err_t res = ESP_OK;
+    int64_t fr_start = esp_timer_get_time();
+
+    fb = esp_camera_fb_get();
+    if (!fb) {
+        Serial.println("Camera capture failed");
+        httpd_resp_send_500(req);
+        return ESP_FAIL;
+    }
+
+    httpd_resp_set_type(req, "image/jpeg");
+    httpd_resp_set_hdr(req, "Content-Disposition", "inline; filename=capture.jpg");
+    httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
+
+    size_t out_len, out_width, out_height;
+    uint8_t * out_buf;
+    bool s;
+    bool detected = false;
+    int face_id = 0;
+    if(!detection_enabled || fb->width > 400){
+        size_t fb_len = 0;
+        if(fb->format == PIXFORMAT_JPEG){
+            fb_len = fb->len;
+            res = httpd_resp_send(req, (const char *)fb->buf, fb->len);
+        } else {
+            jpg_chunking_t jchunk = {req, 0};
+            res = frame2jpg_cb(fb, 80, jpg_encode_stream, &jchunk)?ESP_OK:ESP_FAIL;
+            httpd_resp_send_chunk(req, NULL, 0);
+            fb_len = jchunk.len;
+        }
+        esp_camera_fb_return(fb);
+        int64_t fr_end = esp_timer_get_time();
+        Serial.printf("JPG: %uB %ums\n", (uint32_t)(fb_len), (uint32_t)((fr_end - fr_start)/1000));
+        return res;
+    }
+
+    dl_matrix3du_t *image_matrix = dl_matrix3du_alloc(1, fb->width, fb->height, 3);
+    if (!image_matrix) {
+        esp_camera_fb_return(fb);
+        Serial.println("dl_matrix3du_alloc failed");
+        httpd_resp_send_500(req);
+        return ESP_FAIL;
+    }
+
+    out_buf = image_matrix->item;
+    out_len = fb->width * fb->height * 3;
+    out_width = fb->width;
+    out_height = fb->height;
+
+    s = fmt2rgb888(fb->buf, fb->len, fb->format, out_buf);
+    esp_camera_fb_return(fb);
+    if(!s){
+        dl_matrix3du_free(image_matrix);
+        Serial.println("to rgb888 failed");
+        httpd_resp_send_500(req);
+        return ESP_FAIL;
+    }
+
+    box_array_t *net_boxes = face_detect(image_matrix, &mtmn_config);
+
+    if (net_boxes){
+        detected = true;
+        if(recognition_enabled){
+            face_id = run_face_recognition(image_matrix, net_boxes);
+        }
+        draw_face_boxes(image_matrix, net_boxes, face_id);
+        free(net_boxes->score);
+        free(net_boxes->box);
+        free(net_boxes->landmark);
+        free(net_boxes);
+    }
+
+    jpg_chunking_t jchunk = {req, 0};
+    s = fmt2jpg_cb(out_buf, out_len, out_width, out_height, PIXFORMAT_RGB888, 90, jpg_encode_stream, &jchunk);
+    dl_matrix3du_free(image_matrix);
+    if(!s){
+        Serial.println("JPEG compression failed");
+        return ESP_FAIL;
+    }
+
+    int64_t fr_end = esp_timer_get_time();
+    Serial.printf("FACE: %uB %ums %s%d\n", (uint32_t)(jchunk.len), (uint32_t)((fr_end - fr_start)/1000), detected?"DETECTED ":"", face_id);
+    return res;
+}
+
+static esp_err_t stream_handler(httpd_req_t *req){
+    camera_fb_t * fb = NULL;
+    esp_err_t res = ESP_OK;
+    size_t _jpg_buf_len = 0;
+    uint8_t * _jpg_buf = NULL;
+    char * part_buf[64];
+    dl_matrix3du_t *image_matrix = NULL;
+    bool detected = false;
+    int face_id = 0;
+    int64_t fr_start = 0;
+    int64_t fr_ready = 0;
+    int64_t fr_face = 0;
+    int64_t fr_recognize = 0;
+    int64_t fr_encode = 0;
+
+    static int64_t last_frame = 0;
+    if(!last_frame) {
+        last_frame = esp_timer_get_time();
+    }
+
+    res = httpd_resp_set_type(req, _STREAM_CONTENT_TYPE);
+    if(res != ESP_OK){
+        return res;
+    }
+
+    httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
+
+    while(true){
+        detected = false;
+        face_id = 0;
+        fb = esp_camera_fb_get();
+        if (!fb) {
+            Serial.println("Camera capture failed");
+            res = ESP_FAIL;
+        } else {
+            fr_start = esp_timer_get_time();
+            fr_ready = fr_start;
+            fr_face = fr_start;
+            fr_encode = fr_start;
+            fr_recognize = fr_start;
+            if(!detection_enabled || fb->width > 400){
+                if(fb->format != PIXFORMAT_JPEG){
+                    bool jpeg_converted = frame2jpg(fb, 80, &_jpg_buf, &_jpg_buf_len);
+                    esp_camera_fb_return(fb);
+                    fb = NULL;
+                    if(!jpeg_converted){
+                        Serial.println("JPEG compression failed");
+                        res = ESP_FAIL;
+                    }
+                } else {
+                    _jpg_buf_len = fb->len;
+                    _jpg_buf = fb->buf;
+                }
+            } else {
+
+                image_matrix = dl_matrix3du_alloc(1, fb->width, fb->height, 3);
+
+                if (!image_matrix) {
+                    Serial.println("dl_matrix3du_alloc failed");
+                    res = ESP_FAIL;
+                } else {
+                    if(!fmt2rgb888(fb->buf, fb->len, fb->format, image_matrix->item)){
+                        Serial.println("fmt2rgb888 failed");
+                        res = ESP_FAIL;
+                    } else {
+                        fr_ready = esp_timer_get_time();
+                        box_array_t *net_boxes = NULL;
+                        if(detection_enabled){
+                            net_boxes = face_detect(image_matrix, &mtmn_config);
+                        }
+                        fr_face = esp_timer_get_time();
+                        fr_recognize = fr_face;
+                        if (net_boxes || fb->format != PIXFORMAT_JPEG){
+                            if(net_boxes){
+                                detected = true;
+                                if(recognition_enabled){
+                                    face_id = run_face_recognition(image_matrix, net_boxes);
+                                }
+                                fr_recognize = esp_timer_get_time();
+                                draw_face_boxes(image_matrix, net_boxes, face_id);
+                                free(net_boxes->score);
+                                free(net_boxes->box);
+                                free(net_boxes->landmark);
+                                free(net_boxes);
+                            }
+                            if(!fmt2jpg(image_matrix->item, fb->width*fb->height*3, fb->width, fb->height, PIXFORMAT_RGB888, 90, &_jpg_buf, &_jpg_buf_len)){
+                                Serial.println("fmt2jpg failed");
+                                res = ESP_FAIL;
+                            }
+                            esp_camera_fb_return(fb);
+                            fb = NULL;
+                        } else {
+                            _jpg_buf = fb->buf;
+                            _jpg_buf_len = fb->len;
+                        }
+                        fr_encode = esp_timer_get_time();
+                    }
+                    dl_matrix3du_free(image_matrix);
+                }
+            }
+        }
+        if(res == ESP_OK){
+            res = httpd_resp_send_chunk(req, _STREAM_BOUNDARY, strlen(_STREAM_BOUNDARY));
+        }
+        if(res == ESP_OK){
+            size_t hlen = snprintf((char *)part_buf, 64, _STREAM_PART, _jpg_buf_len);
+            res = httpd_resp_send_chunk(req, (const char *)part_buf, hlen);
+        }
+        if(res == ESP_OK){
+            res = httpd_resp_send_chunk(req, (const char *)_jpg_buf, _jpg_buf_len);
+        }
+        if(fb){
+            esp_camera_fb_return(fb);
+            fb = NULL;
+            _jpg_buf = NULL;
+        } else if(_jpg_buf){
+            free(_jpg_buf);
+            _jpg_buf = NULL;
+        }
+        if(res != ESP_OK){
+            break;
+        }
+        int64_t fr_end = esp_timer_get_time();
+
+        int64_t ready_time = (fr_ready - fr_start)/1000;
+        int64_t face_time = (fr_face - fr_ready)/1000;
+        int64_t recognize_time = (fr_recognize - fr_face)/1000;
+        int64_t encode_time = (fr_encode - fr_recognize)/1000;
+        int64_t process_time = (fr_encode - fr_start)/1000;
+        
+        int64_t frame_time = fr_end - last_frame;
+        last_frame = fr_end;
+        frame_time /= 1000;
+        uint32_t avg_frame_time = ra_filter_run(&ra_filter, frame_time);
+        Serial.printf("MJPG: %uB %ums (%.1ffps), AVG: %ums (%.1ffps), %u+%u+%u+%u=%u %s%d\n",
+            (uint32_t)(_jpg_buf_len),
+            (uint32_t)frame_time, 1000.0 / (uint32_t)frame_time,
+            avg_frame_time, 1000.0 / avg_frame_time,
+            (uint32_t)ready_time, (uint32_t)face_time, (uint32_t)recognize_time, (uint32_t)encode_time, (uint32_t)process_time,
+            (detected)?"DETECTED ":"", face_id
+        );
+    }
+
+    last_frame = 0;
+    return res;
+}
+
+static esp_err_t cmd_handler(httpd_req_t *req){
+    char*  buf;
+    size_t buf_len;
+    char variable[32] = {0,};
+    char value[32] = {0,};
+
+    buf_len = httpd_req_get_url_query_len(req) + 1;
+    if (buf_len > 1) {
+        buf = (char*)malloc(buf_len);
+        if(!buf){
+            httpd_resp_send_500(req);
+            return ESP_FAIL;
+        }
+        if (httpd_req_get_url_query_str(req, buf, buf_len) == ESP_OK) {
+            if (httpd_query_key_value(buf, "var", variable, sizeof(variable)) == ESP_OK &&
+                httpd_query_key_value(buf, "val", value, sizeof(value)) == ESP_OK) {
+            } else {
+                free(buf);
+                httpd_resp_send_404(req);
+                return ESP_FAIL;
+            }
+        } else {
+            free(buf);
+            httpd_resp_send_404(req);
+            return ESP_FAIL;
+        }
+        free(buf);
+    } else {
+        httpd_resp_send_404(req);
+        return ESP_FAIL;
+    }
+
+    int val = atoi(value);
+    sensor_t * s = esp_camera_sensor_get();
+    int res = 0;
+
+    if(!strcmp(variable, "framesize")) {
+        if(s->pixformat == PIXFORMAT_JPEG) res = s->set_framesize(s, (framesize_t)val);
+    }
+    else if(!strcmp(variable, "quality")) res = s->set_quality(s, val);
+    else if(!strcmp(variable, "contrast")) res = s->set_contrast(s, val);
+    else if(!strcmp(variable, "brightness")) res = s->set_brightness(s, val);
+    else if(!strcmp(variable, "saturation")) res = s->set_saturation(s, val);
+    else if(!strcmp(variable, "gainceiling")) res = s->set_gainceiling(s, (gainceiling_t)val);
+    else if(!strcmp(variable, "colorbar")) res = s->set_colorbar(s, val);
+    else if(!strcmp(variable, "awb")) res = s->set_whitebal(s, val);
+    else if(!strcmp(variable, "agc")) res = s->set_gain_ctrl(s, val);
+    else if(!strcmp(variable, "aec")) res = s->set_exposure_ctrl(s, val);
+    else if(!strcmp(variable, "hmirror")) res = s->set_hmirror(s, val);
+    else if(!strcmp(variable, "vflip")) res = s->set_vflip(s, val);
+    else if(!strcmp(variable, "awb_gain")) res = s->set_awb_gain(s, val);
+    else if(!strcmp(variable, "agc_gain")) res = s->set_agc_gain(s, val);
+    else if(!strcmp(variable, "aec_value")) res = s->set_aec_value(s, val);
+    else if(!strcmp(variable, "aec2")) res = s->set_aec2(s, val);
+    else if(!strcmp(variable, "dcw")) res = s->set_dcw(s, val);
+    else if(!strcmp(variable, "bpc")) res = s->set_bpc(s, val);
+    else if(!strcmp(variable, "wpc")) res = s->set_wpc(s, val);
+    else if(!strcmp(variable, "raw_gma")) res = s->set_raw_gma(s, val);
+    else if(!strcmp(variable, "lenc")) res = s->set_lenc(s, val);
+    else if(!strcmp(variable, "special_effect")) res = s->set_special_effect(s, val);
+    else if(!strcmp(variable, "wb_mode")) res = s->set_wb_mode(s, val);
+    else if(!strcmp(variable, "ae_level")) res = s->set_ae_level(s, val);
+    else if(!strcmp(variable, "face_detect")) {
+        detection_enabled = val;
+        if(!detection_enabled) {
+            recognition_enabled = 0;
+        }
+    }
+    else if(!strcmp(variable, "face_enroll")) is_enrolling = val;
+    else if(!strcmp(variable, "face_recognize")) {
+        recognition_enabled = val;
+        if(recognition_enabled){
+            detection_enabled = val;
+        }
+    }
+    else {
+        res = -1;
+    }
+
+    if(res){
+        return httpd_resp_send_500(req);
+    }
+
+    httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
+    return httpd_resp_send(req, NULL, 0);
+}
+
+static esp_err_t status_handler(httpd_req_t *req){
+    static char json_response[1024];
+
+    sensor_t * s = esp_camera_sensor_get();
+    char * p = json_response;
+    *p++ = '{';
+
+    p+=sprintf(p, "\"framesize\":%u,", s->status.framesize);
+    p+=sprintf(p, "\"quality\":%u,", s->status.quality);
+    p+=sprintf(p, "\"brightness\":%d,", s->status.brightness);
+    p+=sprintf(p, "\"contrast\":%d,", s->status.contrast);
+    p+=sprintf(p, "\"saturation\":%d,", s->status.saturation);
+    p+=sprintf(p, "\"sharpness\":%d,", s->status.sharpness);
+    p+=sprintf(p, "\"special_effect\":%u,", s->status.special_effect);
+    p+=sprintf(p, "\"wb_mode\":%u,", s->status.wb_mode);
+    p+=sprintf(p, "\"awb\":%u,", s->status.awb);
+    p+=sprintf(p, "\"awb_gain\":%u,", s->status.awb_gain);
+    p+=sprintf(p, "\"aec\":%u,", s->status.aec);
+    p+=sprintf(p, "\"aec2\":%u,", s->status.aec2);
+    p+=sprintf(p, "\"ae_level\":%d,", s->status.ae_level);
+    p+=sprintf(p, "\"aec_value\":%u,", s->status.aec_value);
+    p+=sprintf(p, "\"agc\":%u,", s->status.agc);
+    p+=sprintf(p, "\"agc_gain\":%u,", s->status.agc_gain);
+    p+=sprintf(p, "\"gainceiling\":%u,", s->status.gainceiling);
+    p+=sprintf(p, "\"bpc\":%u,", s->status.bpc);
+    p+=sprintf(p, "\"wpc\":%u,", s->status.wpc);
+    p+=sprintf(p, "\"raw_gma\":%u,", s->status.raw_gma);
+    p+=sprintf(p, "\"lenc\":%u,", s->status.lenc);
+    p+=sprintf(p, "\"vflip\":%u,", s->status.vflip);
+    p+=sprintf(p, "\"hmirror\":%u,", s->status.hmirror);
+    p+=sprintf(p, "\"dcw\":%u,", s->status.dcw);
+    p+=sprintf(p, "\"colorbar\":%u,", s->status.colorbar);
+    p+=sprintf(p, "\"face_detect\":%u,", detection_enabled);
+    p+=sprintf(p, "\"face_enroll\":%u,", is_enrolling);
+    p+=sprintf(p, "\"face_recognize\":%u", recognition_enabled);
+    *p++ = '}';
+    *p++ = 0;
+    httpd_resp_set_type(req, "application/json");
+    httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
+    return httpd_resp_send(req, json_response, strlen(json_response));
+}
+
+static esp_err_t index_handler(httpd_req_t *req){
+    httpd_resp_set_type(req, "text/html");
+    httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+    sensor_t * s = esp_camera_sensor_get();
+    if (s->id.PID == OV3660_PID) {
+        return httpd_resp_send(req, (const char *)index_ov3660_html_gz, index_ov3660_html_gz_len);
+    }
+    return httpd_resp_send(req, (const char *)index_ov2640_html_gz, index_ov2640_html_gz_len);
+}
+
+void startCameraServer(){
+    httpd_config_t config = HTTPD_DEFAULT_CONFIG();
+
+    httpd_uri_t index_uri = {
+        .uri       = "/",
+        .method    = HTTP_GET,
+        .handler   = index_handler,
+        .user_ctx  = NULL
+    };
+
+    httpd_uri_t status_uri = {
+        .uri       = "/status",
+        .method    = HTTP_GET,
+        .handler   = status_handler,
+        .user_ctx  = NULL
+    };
+
+    httpd_uri_t cmd_uri = {
+        .uri       = "/control",
+        .method    = HTTP_GET,
+        .handler   = cmd_handler,
+        .user_ctx  = NULL
+    };
+
+    httpd_uri_t capture_uri = {
+        .uri       = "/capture",
+        .method    = HTTP_GET,
+        .handler   = capture_handler,
+        .user_ctx  = NULL
+    };
+
+   httpd_uri_t stream_uri = {
+        .uri       = "/stream",
+        .method    = HTTP_GET,
+        .handler   = stream_handler,
+        .user_ctx  = NULL
+    };
+
+
+    ra_filter_init(&ra_filter, 20);
+    
+    mtmn_config.type = FAST;
+    mtmn_config.min_face = 80;
+    mtmn_config.pyramid = 0.707;
+    mtmn_config.pyramid_times = 4;
+    mtmn_config.p_threshold.score = 0.6;
+    mtmn_config.p_threshold.nms = 0.7;
+    mtmn_config.p_threshold.candidate_number = 20;
+    mtmn_config.r_threshold.score = 0.7;
+    mtmn_config.r_threshold.nms = 0.7;
+    mtmn_config.r_threshold.candidate_number = 10;
+    mtmn_config.o_threshold.score = 0.7;
+    mtmn_config.o_threshold.nms = 0.7;
+    mtmn_config.o_threshold.candidate_number = 1;
+    
+    face_id_init(&id_list, FACE_ID_SAVE_NUMBER, ENROLL_CONFIRM_TIMES);
+    
+    Serial.printf("Starting web server on port: '%d'\n", config.server_port);
+    if (httpd_start(&camera_httpd, &config) == ESP_OK) {
+        httpd_register_uri_handler(camera_httpd, &index_uri);
+        httpd_register_uri_handler(camera_httpd, &cmd_uri);
+        httpd_register_uri_handler(camera_httpd, &status_uri);
+        httpd_register_uri_handler(camera_httpd, &capture_uri);
+    }
+
+    config.server_port += 1;
+    config.ctrl_port += 1;
+    Serial.printf("Starting stream server on port: '%d'\n", config.server_port);
+    if (httpd_start(&stream_httpd, &config) == ESP_OK) {
+        httpd_register_uri_handler(stream_httpd, &stream_uri);
+    }
+}
+#endif

libraries/ESP32/examples/Camera/CameraWebServer/camera_index.h

@@ -0,0 +1,558 @@
+
+//File: index_ov2640.html.gz, Size: 4316
+#define index_ov2640_html_gz_len 4316
+const uint8_t index_ov2640_html_gz[] = {
+ 0x1F, 0x8B, 0x08, 0x08, 0x50, 0x5C, 0xAE, 0x5C, 0x00, 0x03, 0x69, 0x6E, 0x64, 0x65, 0x78, 0x5F,
+ 0x6F, 0x76, 0x32, 0x36, 0x34, 0x30, 0x2E, 0x68, 0x74, 0x6D, 0x6C, 0x00, 0xE5, 0x5D, 0x7B, 0x73,
+ 0xD3, 0xC6, 0x16, 0xFF, 0x9F, 0x4F, 0x21, 0x04, 0x25, 0xF6, 0x34, 0x76, 0x6C, 0xC7, 0x84, 0xE0,
+ 0xDA, 0xE2, 0x42, 0x08, 0xD0, 0x19, 0x5E, 0x25, 0x2D, 0x74, 0xA6, 0xD3, 0x81, 0xB5, 0xB4, 0xB2,
+ 0x55, 0x64, 0xC9, 0x95, 0x56, 0x76, 0x52, 0x26, 0x9F, 0xE3, 0x7E, 0xA0, 0xFB, 0xC5, 0xEE, 0xD9,
+ 0x87, 0xA4, 0x95, 0xBC, 0x7A, 0xD8, 0x26, 0x36, 0x97, 0xEB, 0xCC, 0x14, 0xD9, 0xDA, 0x73, 0xF6,
+ 0x9C, 0xF3, 0x3B, 0xAF, 0x5D, 0x3D, 0x3A, 0xBC, 0x6D, 0xF9, 0x26, 0xB9, 0x9A, 0x63, 0x6D, 0x4A,
+ 0x66, 0xAE, 0x71, 0x6B, 0xC8, 0xFF, 0xD1, 0xE0, 0x33, 0x9C, 0x62, 0x64, 0xF1, 0x43, 0xF6, 0x75,
+ 0x86, 0x09, 0xD2, 0xCC, 0x29, 0x0A, 0x42, 0x4C, 0x46, 0x7A, 0x44, 0xEC, 0xD6, 0xA9, 0x9E, 0x3F,
+ 0xED, 0xA1, 0x19, 0x1E, 0xE9, 0x0B, 0x07, 0x2F, 0xE7, 0x7E, 0x40, 0x74, 0xCD, 0xF4, 0x3D, 0x82,
+ 0x3D, 0x18, 0xBE, 0x74, 0x2C, 0x32, 0x1D, 0x59, 0x78, 0xE1, 0x98, 0xB8, 0xC5, 0xBE, 0x1C, 0x3A,
+ 0x9E, 0x43, 0x1C, 0xE4, 0xB6, 0x42, 0x13, 0xB9, 0x78, 0xD4, 0x95, 0x79, 0x11, 0x87, 0xB8, 0xD8,
+ 0x38, 0xBF, 0x78, 0x7B, 0xDC, 0xD3, 0xDE, 0xBC, 0xEF, 0xF5, 0x4F, 0x3A, 0xC3, 0x23, 0xFE, 0x5B,
+ 0x3A, 0x26, 0x24, 0x57, 0xF2, 0x77, 0xFA, 0x19, 0xFB, 0xD6, 0x95, 0xF6, 0x25, 0xF3, 0x13, 0xFD,
+ 0xD8, 0x20, 0x44, 0xCB, 0x46, 0x33, 0xC7, 0xBD, 0x1A, 0x68, 0x8F, 0x03, 0x98, 0xF3, 0xF0, 0x05,
+ 0x76, 0x17, 0x98, 0x38, 0x26, 0x3A, 0x0C, 0x91, 0x17, 0xB6, 0x42, 0x1C, 0x38, 0xF6, 0x4F, 0x2B,
+ 0x84, 0x63, 0x64, 0x7E, 0x9E, 0x04, 0x7E, 0xE4, 0x59, 0x03, 0xED, 0x4E, 0xF7, 0x94, 0xFE, 0xAD,
+ 0x0E, 0x32, 0x7D, 0xD7, 0x0F, 0xE0, 0xFC, 0xF9, 0x33, 0xFA, 0xB7, 0x7A, 0x9E, 0xCD, 0x1E, 0x3A,
+ 0xFF, 0xE0, 0x81, 0xD6, 0x3D, 0x99, 0x5F, 0x66, 0xCE, 0x5F, 0xDF, 0xCA, 0x7C, 0x9D, 0xF6, 0x8A,
+ 0xA4, 0x17, 0xF4, 0xA7, 0xE5, 0xF4, 0x21, 0x36, 0x89, 0xE3, 0x7B, 0xED, 0x19, 0x72, 0x3C, 0x05,
+ 0x27, 0xCB, 0x09, 0xE7, 0x2E, 0x02, 0x1B, 0xD8, 0x2E, 0x2E, 0xE5, 0x73, 0x67, 0x86, 0xBD, 0xE8,
+ 0xB0, 0x82, 0x1B, 0x65, 0xD2, 0xB2, 0x9C, 0x80, 0x8F, 0x1A, 0x50, 0x3B, 0x44, 0x33, 0xAF, 0x92,
+ 0x6D, 0x99, 0x5C, 0x9E, 0xEF, 0x61, 0x85, 0x01, 0xE9, 0x44, 0xCB, 0x00, 0xCD, 0xE9, 0x00, 0xFA,
+ 0xEF, 0xEA, 0x90, 0x99, 0xE3, 0x71, 0xA7, 0x1A, 0x68, 0xC7, 0xFD, 0xCE, 0xFC, 0xB2, 0x02, 0xCA,
+ 0xE3, 0x13, 0xFA, 0xB7, 0x3A, 0x68, 0x8E, 0x2C, 0xCB, 0xF1, 0x26, 0x03, 0xED, 0x54, 0xC9, 0xC2,
+ 0x0F, 0x2C, 0x1C, 0xB4, 0x02, 0x64, 0x39, 0x51, 0x38, 0xD0, 0xFA, 0xAA, 0x31, 0x33, 0x14, 0x4C,
+ 0x40, 0x16, 0xE2, 0x83, 0xB0, 0xAD, 0xAE, 0x52, 0x12, 0x31, 0x24, 0x70, 0x26, 0x53, 0x02, 0x90,
+ 0xAE, 0x8C, 0xC9, 0x1B, 0x4D, 0x84, 0x50, 0x15, 0x9E, 0xA5, 0x76, 0x53, 0x5B, 0x0D, 0xB9, 0xCE,
+ 0xC4, 0x6B, 0x39, 0x04, 0xCF, 0x40, 0x9D, 0x90, 0x04, 0x98, 0x98, 0xD3, 0x32, 0x51, 0x6C, 0x67,
+ 0x12, 0x05, 0x58, 0x21, 0x48, 0x62, 0xB7, 0x12, 0x85, 0xE1, 0xE4, 0xEA, 0xA9, 0xD6, 0x12, 0x8F,
+ 0x3F, 0x3B, 0xA4, 0x25, 0x6C, 0x32, 0xC6, 0xB6, 0x1F, 0x60, 0xE5, 0xC8, 0x78, 0x84, 0xEB, 0x9B,
+ 0x9F, 0x5B, 0x21, 0x41, 0x01, 0xA9, 0xC3, 0x10, 0xD9, 0x04, 0x07, 0xD5, 0xFC, 0x30, 0xF5, 0x8A,
+ 0x6A, 0x6E, 0xC5, 0xD3, 0x8A, 0x01, 0x8E, 0xE7, 0x3A, 0x1E, 0xAE, 0x2F, 0x5E, 0xD1, 0xBC, 0x59,
+ 0x76, 0x7C, 0x54, 0x0D, 0x60, 0x9C, 0xD9, 0xA4, 0xCC, 0x4B, 0x98, 0xAE, 0xAB, 0x93, 0x89, 0xB8,
+ 0xE9, 0x76, 0x3A, 0x3F, 0xAC, 0x9E, 0x9C, 0x62, 0xEE, 0xA6, 0x28, 0x22, 0xFE, 0xF6, 0x11, 0xB1,
+ 0x12, 0x56, 0x39, 0x3D, 0xFE, 0x35, 0xC3, 0x96, 0x83, 0xB4, 0x86, 0x14, 0xCE, 0xA7, 0x1D, 0xF0,
+ 0xA9, 0xA6, 0x86, 0x3C, 0x4B, 0x6B, 0xF8, 0x81, 0x03, 0x81, 0x80, 0x58, 0xBA, 0x71, 0xE1, 0x17,
+ 0x28, 0x1C, 0x73, 0xDC, 0x54, 0xA8, 0x5C, 0x12, 0x33, 0xB2, 0x45, 0xD4, 0x61, 0x43, 0x3F, 0x35,
+ 0x52, 0x0E, 0xFD, 0x54, 0x06, 0x90, 0x42, 0x47, 0xC6, 0xBE, 0x0C, 0x2F, 0x59, 0xC2, 0x22, 0xCC,
+ 0xE8, 0x67, 0x86, 0x2E, 0x5B, 0xA5, 0xD8, 0xC5, 0x83, 0x62, 0x0C, 0xA1, 0xCC, 0x9A, 0x0D, 0x18,
+ 0xBA, 0x98, 0x6A, 0x2D, 0x8D, 0x66, 0xC9, 0xA6, 0x9A, 0x46, 0x30, 0x55, 0x43, 0x4E, 0x3F, 0xB2,
+ 0x53, 0xAC, 0xA1, 0xAE, 0x5A, 0xD5, 0x34, 0x77, 0xF0, 0x3F, 0x95, 0x0F, 0x71, 0x4D, 0x0A, 0xB3,
+ 0x08, 0xFD, 0xD4, 0xCF, 0x24, 0x29, 0xB3, 0xCA, 0x6C, 0xA2, 0x60, 0x5C, 0x9C, 0x51, 0x56, 0xF8,
+ 0x16, 0x45, 0xB7, 0x82, 0x6B, 0xB9, 0x08, 0x75, 0xB3, 0x8B, 0x82, 0x71, 0x99, 0x0C, 0x95, 0x59,
+ 0x86, 0x7E, 0xAE, 0x6B, 0xF4, 0x1B, 0x77, 0xC6, 0x11, 0x21, 0xBE, 0x17, 0x6E, 0x55, 0xA2, 0x8A,
+ 0xE2, 0xEC, 0xAF, 0x28, 0x24, 0x8E, 0x7D, 0xD5, 0x12, 0x21, 0x0D, 0x71, 0x36, 0x47, 0xD0, 0x42,
+ 0x8E, 0x31, 0x59, 0x62, 0x5C, 0xDE, 0x6E, 0x78, 0x68, 0x01, 0x79, 0x67, 0x32, 0x71, 0x55, 0xBE,
+ 0x67, 0x46, 0x41, 0x48, 0xFB, 0xB6, 0xB9, 0xEF, 0x00, 0xE3, 0x60, 0x75, 0xE2, 0x6C, 0x0C, 0xD6,
+ 0x9C, 0xA8, 0x65, 0x8E, 0x15, 0x73, 0xF9, 0x11, 0xA1, 0x36, 0x56, 0x22, 0xE1, 0x83, 0x3A, 0x0E,
+ 0xB9, 0x52, 0x9E, 0x13, 0x91, 0xA8, 0x38, 0x13, 0x87, 0x60, 0x69, 0x59, 0xC8, 0xCA, 0x35, 0x30,
+ 0xA7, 0xD8, 0xFC, 0x8C, 0xAD, 0x1F, 0x2B, 0xDB, 0xB0, 0xAA, 0xF6, 0xB0, 0xED, 0x78, 0xF3, 0x88,
+ 0xB4, 0x68, 0x3B, 0x35, 0xBF, 0x11, 0xCC, 0x99, 0x43, 0xC6, 0x2A, 0xF6, 0x7A, 0x65, 0x4D, 0xC5,
+ 0xFD, 0xF9, 0x65, 0xB9, 0x11, 0x64, 0x61, 0x0D, 0x17, 0x8D, 0xB1, 0x5B, 0x26, 0xB2, 0x08, 0x86,
+ 0x82, 0xB4, 0x2B, 0x72, 0x55, 0x71, 0xEF, 0xC6, 0x24, 0x4B, 0x8B, 0x57, 0xFF, 0xC1, 0x0F, 0xB5,
+ 0xED, 0xC8, 0x8E, 0x0F, 0x33, 0x3F, 0x85, 0xD8, 0x85, 0x00, 0x2B, 0x6A, 0xBD, 0x61, 0xCC, 0x12,
+ 0x64, 0x28, 0x9D, 0x20, 0x40, 0xDE, 0x04, 0x43, 0x2E, 0xB8, 0x3C, 0x8C, 0x0F, 0xCB, 0x17, 0x06,
+ 0xB5, 0xD4, 0xA7, 0xA9, 0xFA, 0x7E, 0xF9, 0x42, 0x84, 0x27, 0x84, 0x0D, 0x9A, 0x11, 0x09, 0xD6,
+ 0xD2, 0xF9, 0xBB, 0x4A, 0xA7, 0xE0, 0xFD, 0x88, 0x32, 0x60, 0xB2, 0x2E, 0xA5, 0xEC, 0xEF, 0x2B,
+ 0x33, 0x42, 0xBC, 0xD2, 0xB3, 0xED, 0xAA, 0xB5, 0xA2, 0x6D, 0x1F, 0x77, 0x8E, 0xFB, 0x95, 0x0D,
+ 0x93, 0x52, 0xCB, 0xDC, 0x7A, 0x51, 0x91, 0x31, 0x92, 0x6C, 0x52, 0x0D, 0xC1, 0x60, 0xEA, 0x2F,
+ 0x70, 0xA0, 0x00, 0x22, 0x27, 0x6E, 0xFF, 0x61, 0xDF, 0xAA, 0xC1, 0x0D, 0x41, 0xBE, 0x5F, 0xA8,
+ 0xB2, 0x69, 0x96, 0x5D, 0xAF, 0x6B, 0xF6, 0x4A, 0x1D, 0x93, 0xB3, 0x6B, 0x83, 0x37, 0xA0, 0xB1,
+ 0x8B, 0xAD, 0x92, 0xF4, 0x6C, 0x61, 0x1B, 0x45, 0x2E, 0xA9, 0xB0, 0x37, 0xEA, 0xD0, 0xBF, 0xB2,
+ 0x19, 0x59, 0x5C, 0xFD, 0x41, 0x37, 0x3A, 0x46, 0x2C, 0x12, 0xFE, 0x54, 0xCC, 0x19, 0xD7, 0x4E,
+ 0x34, 0x9F, 0x63, 0x04, 0xA3, 0x4C, 0x5C, 0xB4, 0x24, 0xAD, 0xD5, 0x33, 0xAB, 0x13, 0x57, 0xAD,
+ 0x85, 0x68, 0xA5, 0x2B, 0x26, 0xDD, 0xD0, 0x5A, 0x3A, 0x0F, 0x6C, 0xDF, 0x8C, 0x54, 0x65, 0xBA,
+ 0x9E, 0x4B, 0xAD, 0xF2, 0x1B, 0xC4, 0x26, 0x0B, 0x5D, 0x87, 0x39, 0x76, 0xE4, 0x79, 0x14, 0xD1,
+ 0x16, 0x09, 0x40, 0x4D, 0xC5, 0x44, 0xF5, 0x0C, 0xB7, 0x51, 0x74, 0x66, 0x0C, 0x5B, 0xB4, 0x19,
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+ 0xAD, 0x92, 0x9C, 0xA6, 0xA0, 0x2D, 0x5E, 0x6D, 0x89, 0x73, 0xDE, 0x54, 0xD4, 0x0A, 0xAF, 0xB6,
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+ 0xAF, 0x1D, 0x28, 0x41, 0xAA, 0x96, 0x7A, 0x85, 0x11, 0xAB, 0x92, 0xEC, 0x75, 0xB3, 0xFF, 0xDD,
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+ 0x5F, 0x6B, 0x19, 0x2B, 0x19, 0x9D, 0x06, 0x4E, 0xCA, 0x80, 0x77, 0xFC, 0x86, 0x76, 0x3F, 0xBF,
+ 0x26, 0xE6, 0xBD, 0x17, 0x57, 0x36, 0xD7, 0x71, 0xC9, 0x03, 0x12, 0x95, 0x32, 0x63, 0x92, 0x00,
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+ 0x22, 0x9E, 0xC6, 0x39, 0xFB, 0xF9, 0x99, 0xE6, 0x07, 0x1A, 0x7F, 0xC1, 0x5D, 0x90, 0xBC, 0x5B,
+ 0x44, 0x13, 0x6F, 0x7F, 0x62, 0xAB, 0x42, 0x9A, 0x83, 0xC8, 0xD4, 0x09, 0xA1, 0x49, 0xA6, 0x4F,
+ 0xDE, 0xE2, 0xDB, 0x7A, 0xF2, 0x82, 0xA7, 0x4A, 0xF5, 0x78, 0x57, 0xFC, 0x53, 0xA2, 0x48, 0xCE,
+ 0x9C, 0x9C, 0x26, 0xB5, 0xE5, 0x6D, 0xA1, 0xE3, 0x4A, 0x22, 0x2A, 0x5B, 0x87, 0xAE, 0x61, 0xC2,
+ 0xE4, 0xF4, 0x37, 0x6B, 0x45, 0xB5, 0x02, 0x95, 0x86, 0x4C, 0xC8, 0x52, 0x5B, 0xA6, 0xBA, 0xAE,
+ 0x58, 0x53, 0xB5, 0xD8, 0x2F, 0x41, 0x94, 0xEE, 0x79, 0x29, 0xB3, 0x7C, 0x31, 0x2A, 0xDC, 0xE2,
+ 0xBC, 0xB0, 0xF2, 0xCF, 0xF0, 0x28, 0xDE, 0x59, 0xE5, 0xDF, 0xF8, 0xAB, 0x8B, 0x86, 0x47, 0xFC,
+ 0x7F, 0x22, 0xF6, 0x5F, 0x04, 0x9C, 0x39, 0x76, 0x5C, 0x6C, 0x00, 0x00
+};
+
+
+//File: index_ov3660.html.gz, Size: 4408
+#define index_ov3660_html_gz_len 4408
+const uint8_t index_ov3660_html_gz[] = {
+ 0x1F, 0x8B, 0x08, 0x08, 0x28, 0x5C, 0xAE, 0x5C, 0x00, 0x03, 0x69, 0x6E, 0x64, 0x65, 0x78, 0x5F,
+ 0x6F, 0x76, 0x33, 0x36, 0x36, 0x30, 0x2E, 0x68, 0x74, 0x6D, 0x6C, 0x00, 0xE5, 0x5D, 0xEB, 0x92,
+ 0xD3, 0xC6, 0x12, 0xFE, 0xCF, 0x53, 0x08, 0x41, 0x58, 0x6F, 0x65, 0xED, 0xF5, 0x6D, 0xCD, 0xE2,
+ 0xD8, 0xE6, 0xC0, 0xB2, 0x84, 0x54, 0x01, 0x49, 0x20, 0x21, 0xA9, 0x4A, 0xA5, 0x60, 0x2C, 0x8D,
+ 0xED, 0x09, 0xB2, 0xE4, 0x48, 0x23, 0x7B, 0x37, 0xD4, 0x3E, 0xC7, 0x79, 0xA0, 0xF3, 0x62, 0xA7,
+ 0xE7, 0x22, 0x69, 0x24, 0x8F, 0x2E, 0xB6, 0x59, 0x9B, 0xC3, 0x31, 0x55, 0x20, 0x5B, 0xD3, 0x3D,
+ 0xDD, 0xFD, 0xF5, 0x6D, 0x46, 0x17, 0x06, 0x77, 0x6D, 0xCF, 0xA2, 0xD7, 0x0B, 0x6C, 0xCC, 0xE8,
+ 0xDC, 0x19, 0xDD, 0x19, 0x88, 0x7F, 0x0C, 0xF8, 0x0C, 0x66, 0x18, 0xD9, 0xE2, 0x90, 0x7F, 0x9D,
+ 0x63, 0x8A, 0x0C, 0x6B, 0x86, 0xFC, 0x00, 0xD3, 0xA1, 0x19, 0xD2, 0x49, 0xFD, 0xDC, 0xCC, 0x9E,
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+ 0xF9, 0xF6, 0xA7, 0x4E, 0xDB, 0xF8, 0xF1, 0x5D, 0xA7, 0xD7, 0x6B, 0x0E, 0x4E, 0xC5, 0x6F, 0xC9,
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+ 0x84, 0x1B, 0x63, 0x52, 0xB7, 0x89, 0x2F, 0x46, 0xF5, 0x99, 0x1D, 0xC2, 0xB9, 0x5B, 0xCA, 0xB6,
+ 0x48, 0x2E, 0xD7, 0x73, 0xB1, 0xC6, 0x80, 0x6C, 0xA2, 0x95, 0x8F, 0x16, 0x6C, 0x00, 0xFB, 0x77,
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+ 0x11, 0xE6, 0x4A, 0x80, 0xAC, 0x2A, 0x04, 0x4F, 0x43, 0x7A, 0x6E, 0x29, 0xFB, 0xE8, 0xD9, 0xA9,
+ 0xDE, 0x2B, 0xAE, 0xDD, 0xB2, 0x36, 0x2D, 0xCF, 0xB0, 0xC3, 0x75, 0xD3, 0x8A, 0x3E, 0x25, 0xC5,
+ 0x20, 0x49, 0x30, 0x6B, 0xC2, 0x66, 0xDA, 0x14, 0xC5, 0x2F, 0xA2, 0x01, 0x91, 0xEC, 0x6A, 0x40,
+ 0xE4, 0xC8, 0x9E, 0xEE, 0xE2, 0x32, 0xED, 0x42, 0x06, 0x72, 0x99, 0xC5, 0x0C, 0xF6, 0xD6, 0x8F,
+ 0x19, 0x2B, 0xD0, 0xD2, 0x09, 0xAA, 0x14, 0x0A, 0x6D, 0x06, 0x2C, 0xAC, 0x18, 0x62, 0x86, 0x48,
+ 0xDA, 0x6C, 0xB7, 0x99, 0xAE, 0x0E, 0x17, 0x21, 0x58, 0x69, 0x1E, 0xF9, 0xA4, 0xF8, 0x8D, 0xB5,
+ 0x6C, 0x71, 0xF0, 0x40, 0x0B, 0x57, 0x14, 0xD4, 0x70, 0x5A, 0xC9, 0x04, 0xB2, 0xDF, 0x2B, 0x21,
+ 0x50, 0xEE, 0xBA, 0xE0, 0xB4, 0xF0, 0xD3, 0xBA, 0xD8, 0x1A, 0x23, 0xC3, 0xB8, 0xE3, 0x18, 0x73,
+ 0x46, 0x24, 0xBB, 0xA2, 0x04, 0xF1, 0xF5, 0xEE, 0x34, 0x0B, 0xF9, 0x5A, 0x57, 0x7A, 0xA3, 0xA0,
+ 0x15, 0xDD, 0xB7, 0x96, 0xE8, 0x83, 0x8B, 0x95, 0xC7, 0xAA, 0xF2, 0x51, 0x97, 0x5D, 0x42, 0xA1,
+ 0xDE, 0x65, 0x27, 0xD4, 0xC7, 0x15, 0xD5, 0xC7, 0x52, 0x7D, 0x46, 0x90, 0x34, 0x84, 0xE5, 0x2D,
+ 0x7F, 0xEC, 0x8C, 0xBF, 0x3D, 0x4D, 0x34, 0x5B, 0x8D, 0x0B, 0xE5, 0x94, 0xAD, 0xB8, 0xA2, 0x5E,
+ 0x31, 0x41, 0xEA, 0x9E, 0x62, 0xA1, 0xD6, 0x6A, 0x5C, 0x4D, 0xAD, 0xA8, 0x95, 0x67, 0x04, 0x89,
+ 0x5A, 0xFA, 0x86, 0x3F, 0x52, 0x25, 0xDE, 0x42, 0xE6, 0xFF, 0xA7, 0x4B, 0xFC, 0xCE, 0x94, 0x58,
+ 0x58, 0xB1, 0xFF, 0x5A, 0x5A, 0xCA, 0xC4, 0x30, 0x45, 0xC9, 0x78, 0xC9, 0x50, 0x4A, 0x1A, 0x8F,
+ 0x54, 0xA8, 0x63, 0x39, 0x0A, 0xA9, 0xA3, 0x41, 0xA2, 0x06, 0xC6, 0x5F, 0x2B, 0x19, 0x2B, 0x1E,
+ 0x9D, 0x04, 0x42, 0xC2, 0x40, 0x34, 0xE0, 0x23, 0xE3, 0x2C, 0xBB, 0xD4, 0x14, 0x8D, 0x90, 0x50,
+ 0x36, 0xD3, 0xFE, 0xA8, 0x03, 0x62, 0x95, 0x52, 0x63, 0xE2, 0x00, 0x11, 0xF4, 0x79, 0x62, 0x96,
+ 0x8A, 0x82, 0x1C, 0xEC, 0xD3, 0x9A, 0xF9, 0x93, 0x83, 0xD9, 0xF2, 0x41, 0xDE, 0x14, 0x7E, 0xF1,
+ 0xC3, 0x73, 0xC3, 0xF3, 0x0D, 0xF1, 0x16, 0x4D, 0x3F, 0x7E, 0x6B, 0x8E, 0x21, 0x5F, 0x31, 0xC7,
+ 0x17, 0x69, 0xC4, 0x9D, 0x1A, 0x74, 0x46, 0x02, 0xE8, 0x59, 0xD9, 0x93, 0xE0, 0xF8, 0xAE, 0x19,
+ 0xBF, 0x45, 0xAE, 0x54, 0x3D, 0xD1, 0xA4, 0x7E, 0x17, 0x2B, 0x92, 0x31, 0xA7, 0xA0, 0x49, 0x6C,
+ 0x79, 0x57, 0xEA, 0xB8, 0x96, 0x58, 0x8A, 0x96, 0x85, 0x1B, 0x98, 0x30, 0x3E, 0xFD, 0xC5, 0x5A,
+ 0x51, 0xAF, 0x40, 0xA9, 0x21, 0x63, 0xB2, 0xC4, 0x96, 0x89, 0xAE, 0x6B, 0xD6, 0xD4, 0xAD, 0xBD,
+ 0x0B, 0x10, 0x65, 0x5B, 0x49, 0xDA, 0x6C, 0x9E, 0x8F, 0x8A, 0xB0, 0xB8, 0xA8, 0x72, 0xE2, 0x33,
+ 0x38, 0x8D, 0x36, 0x2C, 0xC5, 0x37, 0xF1, 0x52, 0xAE, 0xC1, 0xA9, 0xF8, 0x9F, 0x0A, 0xFF, 0x0B,
+ 0x9B, 0xFC, 0x8E, 0x51, 0xC1, 0x70, 0x00, 0x00
+};
+

libraries/ESP32/examples/Camera/CameraWebServer/camera_pins.h

@@ -0,0 +1,156 @@
+
+#if defined(CAMERA_MODEL_WROVER_KIT)
+#define PWDN_GPIO_NUM    -1
+#define RESET_GPIO_NUM   -1
+#define XCLK_GPIO_NUM    21
+#define SIOD_GPIO_NUM    26
+#define SIOC_GPIO_NUM    27
+
+#define Y9_GPIO_NUM      35
+#define Y8_GPIO_NUM      34
+#define Y7_GPIO_NUM      39
+#define Y6_GPIO_NUM      36
+#define Y5_GPIO_NUM      19
+#define Y4_GPIO_NUM      18
+#define Y3_GPIO_NUM       5
+#define Y2_GPIO_NUM       4
+#define VSYNC_GPIO_NUM   25
+#define HREF_GPIO_NUM    23
+#define PCLK_GPIO_NUM    22
+
+#elif defined(CAMERA_MODEL_ESP_EYE)
+#define PWDN_GPIO_NUM    -1
+#define RESET_GPIO_NUM   -1
+#define XCLK_GPIO_NUM    4
+#define SIOD_GPIO_NUM    18
+#define SIOC_GPIO_NUM    23
+
+#define Y9_GPIO_NUM      36
+#define Y8_GPIO_NUM      37
+#define Y7_GPIO_NUM      38
+#define Y6_GPIO_NUM      39
+#define Y5_GPIO_NUM      35
+#define Y4_GPIO_NUM      14
+#define Y3_GPIO_NUM      13
+#define Y2_GPIO_NUM      34
+#define VSYNC_GPIO_NUM   5
+#define HREF_GPIO_NUM    27
+#define PCLK_GPIO_NUM    25
+
+#elif defined(CAMERA_MODEL_M5STACK_PSRAM)
+#define PWDN_GPIO_NUM     -1
+#define RESET_GPIO_NUM    15
+#define XCLK_GPIO_NUM     27
+#define SIOD_GPIO_NUM     25
+#define SIOC_GPIO_NUM     23
+
+#define Y9_GPIO_NUM       19
+#define Y8_GPIO_NUM       36
+#define Y7_GPIO_NUM       18
+#define Y6_GPIO_NUM       39
+#define Y5_GPIO_NUM        5
+#define Y4_GPIO_NUM       34
+#define Y3_GPIO_NUM       35
+#define Y2_GPIO_NUM       32
+#define VSYNC_GPIO_NUM    22
+#define HREF_GPIO_NUM     26
+#define PCLK_GPIO_NUM     21
+
+#elif defined(CAMERA_MODEL_M5STACK_V2_PSRAM)
+#define PWDN_GPIO_NUM     -1
+#define RESET_GPIO_NUM    15
+#define XCLK_GPIO_NUM     27
+#define SIOD_GPIO_NUM     22
+#define SIOC_GPIO_NUM     23
+
+#define Y9_GPIO_NUM       19
+#define Y8_GPIO_NUM       36
+#define Y7_GPIO_NUM       18
+#define Y6_GPIO_NUM       39
+#define Y5_GPIO_NUM        5
+#define Y4_GPIO_NUM       34
+#define Y3_GPIO_NUM       35
+#define Y2_GPIO_NUM       32
+#define VSYNC_GPIO_NUM    25
+#define HREF_GPIO_NUM     26
+#define PCLK_GPIO_NUM     21
+
+#elif defined(CAMERA_MODEL_M5STACK_WIDE)
+#define PWDN_GPIO_NUM     -1
+#define RESET_GPIO_NUM    15
+#define XCLK_GPIO_NUM     27
+#define SIOD_GPIO_NUM     22
+#define SIOC_GPIO_NUM     23
+
+#define Y9_GPIO_NUM       19
+#define Y8_GPIO_NUM       36
+#define Y7_GPIO_NUM       18
+#define Y6_GPIO_NUM       39
+#define Y5_GPIO_NUM        5
+#define Y4_GPIO_NUM       34
+#define Y3_GPIO_NUM       35
+#define Y2_GPIO_NUM       32
+#define VSYNC_GPIO_NUM    25
+#define HREF_GPIO_NUM     26
+#define PCLK_GPIO_NUM     21
+
+#elif defined(CAMERA_MODEL_M5STACK_ESP32CAM)
+#define PWDN_GPIO_NUM     -1
+#define RESET_GPIO_NUM    15
+#define XCLK_GPIO_NUM     27
+#define SIOD_GPIO_NUM     25
+#define SIOC_GPIO_NUM     23
+
+#define Y9_GPIO_NUM       19
+#define Y8_GPIO_NUM       36
+#define Y7_GPIO_NUM       18
+#define Y6_GPIO_NUM       39
+#define Y5_GPIO_NUM        5
+#define Y4_GPIO_NUM       34
+#define Y3_GPIO_NUM       35
+#define Y2_GPIO_NUM       17
+#define VSYNC_GPIO_NUM    22
+#define HREF_GPIO_NUM     26
+#define PCLK_GPIO_NUM     21
+
+#elif defined(CAMERA_MODEL_AI_THINKER)
+#define PWDN_GPIO_NUM     32
+#define RESET_GPIO_NUM    -1
+#define XCLK_GPIO_NUM      0
+#define SIOD_GPIO_NUM     26
+#define SIOC_GPIO_NUM     27
+
+#define Y9_GPIO_NUM       35
+#define Y8_GPIO_NUM       34
+#define Y7_GPIO_NUM       39
+#define Y6_GPIO_NUM       36
+#define Y5_GPIO_NUM       21
+#define Y4_GPIO_NUM       19
+#define Y3_GPIO_NUM       18
+#define Y2_GPIO_NUM        5
+#define VSYNC_GPIO_NUM    25
+#define HREF_GPIO_NUM     23
+#define PCLK_GPIO_NUM     22
+
+#elif defined(CAMERA_MODEL_TTGO_T_JOURNAL)
+#define PWDN_GPIO_NUM      0
+#define RESET_GPIO_NUM    15
+#define XCLK_GPIO_NUM     27
+#define SIOD_GPIO_NUM     25
+#define SIOC_GPIO_NUM     23
+
+#define Y9_GPIO_NUM       19
+#define Y8_GPIO_NUM       36
+#define Y7_GPIO_NUM       18
+#define Y6_GPIO_NUM       39
+#define Y5_GPIO_NUM        5
+#define Y4_GPIO_NUM       34
+#define Y3_GPIO_NUM       35
+#define Y2_GPIO_NUM       17
+#define VSYNC_GPIO_NUM    22
+#define HREF_GPIO_NUM     26
+#define PCLK_GPIO_NUM     21
+
+#else
+#error "Camera model not selected"
+#endif

libraries/ESP32/examples/ChipID/GetChipID/GetChipID.ino

@@ -0,0 +1,30 @@
+/* The true ESP32 chip ID is essentially its MAC address.
+This sketch provides an alternate chip ID that matches 
+the output of the ESP.getChipId() function on ESP8266 
+(i.e. a 32-bit integer matching the last 3 bytes of 
+the MAC address. This is less unique than the 
+MAC address chip ID, but is helpful when you need 
+an identifier that can be no more than a 32-bit integer 
+(like for switch...case).
+
+created 2020-06-07 by cweinhofer
+with help from Cicicok */
+	
+uint32_t chipId = 0;
+
+void setup() {
+	Serial.begin(115200);
+}
+
+void loop() {
+	for(int i=0; i<17; i=i+8) {
+	  chipId |= ((ESP.getEfuseMac() >> (40 - i)) & 0xff) << i;
+	}
+
+	Serial.printf("ESP32 Chip model = %s Rev %d\n", ESP.getChipModel(), ESP.getChipRevision());
+	Serial.printf("This chip has %d cores\n", ESP.getChipCores());
+  Serial.print("Chip ID: "); Serial.println(chipId);
+  
+	delay(3000);
+
+}

libraries/ESP32/examples/DeepSleep/ExternalWakeUp/ExternalWakeUp.ino

@@ -0,0 +1,82 @@
+/*
+Deep Sleep with External Wake Up
+=====================================
+This code displays how to use deep sleep with
+an external trigger as a wake up source and how
+to store data in RTC memory to use it over reboots
+
+This code is under Public Domain License.
+
+Hardware Connections
+======================
+Push Button to GPIO 33 pulled down with a 10K Ohm
+resistor
+
+NOTE:
+======
+Only RTC IO can be used as a source for external wake
+source. They are pins: 0,2,4,12-15,25-27,32-39.
+
+Author:
+Pranav Cherukupalli <cherukupallip@gmail.com>
+*/
+
+#define BUTTON_PIN_BITMASK 0x200000000 // 2^33 in hex
+
+RTC_DATA_ATTR int bootCount = 0;
+
+/*
+Method to print the reason by which ESP32
+has been awaken from sleep
+*/
+void print_wakeup_reason(){
+  esp_sleep_wakeup_cause_t wakeup_reason;
+
+  wakeup_reason = esp_sleep_get_wakeup_cause();
+
+  switch(wakeup_reason)
+  {
+    case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
+    case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
+    case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
+    case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
+    case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
+    default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break;
+  }
+}
+
+void setup(){
+  Serial.begin(115200);
+  delay(1000); //Take some time to open up the Serial Monitor
+
+  //Increment boot number and print it every reboot
+  ++bootCount;
+  Serial.println("Boot number: " + String(bootCount));
+
+  //Print the wakeup reason for ESP32
+  print_wakeup_reason();
+
+  /*
+  First we configure the wake up source
+  We set our ESP32 to wake up for an external trigger.
+  There are two types for ESP32, ext0 and ext1 .
+  ext0 uses RTC_IO to wakeup thus requires RTC peripherals
+  to be on while ext1 uses RTC Controller so doesnt need
+  peripherals to be powered on.
+  Note that using internal pullups/pulldowns also requires
+  RTC peripherals to be turned on.
+  */
+  esp_sleep_enable_ext0_wakeup(GPIO_NUM_33,1); //1 = High, 0 = Low
+
+  //If you were to use ext1, you would use it like
+  //esp_sleep_enable_ext1_wakeup(BUTTON_PIN_BITMASK,ESP_EXT1_WAKEUP_ANY_HIGH);
+
+  //Go to sleep now
+  Serial.println("Going to sleep now");
+  esp_deep_sleep_start();
+  Serial.println("This will never be printed");
+}
+
+void loop(){
+  //This is not going to be called
+}

libraries/ESP32/examples/DeepSleep/TimerWakeUp/TimerWakeUp.ino

@@ -0,0 +1,94 @@
+/*
+Simple Deep Sleep with Timer Wake Up
+=====================================
+ESP32 offers a deep sleep mode for effective power
+saving as power is an important factor for IoT
+applications. In this mode CPUs, most of the RAM,
+and all the digital peripherals which are clocked
+from APB_CLK are powered off. The only parts of
+the chip which can still be powered on are:
+RTC controller, RTC peripherals ,and RTC memories
+
+This code displays the most basic deep sleep with
+a timer to wake it up and how to store data in
+RTC memory to use it over reboots
+
+This code is under Public Domain License.
+
+Author:
+Pranav Cherukupalli <cherukupallip@gmail.com>
+*/
+
+#define uS_TO_S_FACTOR 1000000ULL  /* Conversion factor for micro seconds to seconds */
+#define TIME_TO_SLEEP  5        /* Time ESP32 will go to sleep (in seconds) */
+
+RTC_DATA_ATTR int bootCount = 0;
+
+/*
+Method to print the reason by which ESP32
+has been awaken from sleep
+*/
+void print_wakeup_reason(){
+  esp_sleep_wakeup_cause_t wakeup_reason;
+
+  wakeup_reason = esp_sleep_get_wakeup_cause();
+
+  switch(wakeup_reason)
+  {
+    case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
+    case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
+    case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
+    case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
+    case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
+    default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break;
+  }
+}
+
+void setup(){
+  Serial.begin(115200);
+  delay(1000); //Take some time to open up the Serial Monitor
+
+  //Increment boot number and print it every reboot
+  ++bootCount;
+  Serial.println("Boot number: " + String(bootCount));
+
+  //Print the wakeup reason for ESP32
+  print_wakeup_reason();
+
+  /*
+  First we configure the wake up source
+  We set our ESP32 to wake up every 5 seconds
+  */
+  esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
+  Serial.println("Setup ESP32 to sleep for every " + String(TIME_TO_SLEEP) +
+  " Seconds");
+
+  /*
+  Next we decide what all peripherals to shut down/keep on
+  By default, ESP32 will automatically power down the peripherals
+  not needed by the wakeup source, but if you want to be a poweruser
+  this is for you. Read in detail at the API docs
+  http://esp-idf.readthedocs.io/en/latest/api-reference/system/deep_sleep.html
+  Left the line commented as an example of how to configure peripherals.
+  The line below turns off all RTC peripherals in deep sleep.
+  */
+  //esp_deep_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_OFF);
+  //Serial.println("Configured all RTC Peripherals to be powered down in sleep");
+
+  /*
+  Now that we have setup a wake cause and if needed setup the
+  peripherals state in deep sleep, we can now start going to
+  deep sleep.
+  In the case that no wake up sources were provided but deep
+  sleep was started, it will sleep forever unless hardware
+  reset occurs.
+  */
+  Serial.println("Going to sleep now");
+  Serial.flush(); 
+  esp_deep_sleep_start();
+  Serial.println("This will never be printed");
+}
+
+void loop(){
+  //This is not going to be called
+}

libraries/ESP32/examples/DeepSleep/TouchWakeUp/TouchWakeUp.ino

@@ -0,0 +1,91 @@
+/*
+Deep Sleep with Touch Wake Up
+=====================================
+This code displays how to use deep sleep with
+a touch as a wake up source and how to store data in
+RTC memory to use it over reboots
+
+This code is under Public Domain License.
+
+Author:
+Pranav Cherukupalli <cherukupallip@gmail.com>
+*/
+
+#define Threshold 40 /* Greater the value, more the sensitivity */
+
+RTC_DATA_ATTR int bootCount = 0;
+touch_pad_t touchPin;
+/*
+Method to print the reason by which ESP32
+has been awaken from sleep
+*/
+void print_wakeup_reason(){
+  esp_sleep_wakeup_cause_t wakeup_reason;
+
+  wakeup_reason = esp_sleep_get_wakeup_cause();
+
+  switch(wakeup_reason)
+  {
+    case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
+    case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
+    case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
+    case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
+    case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
+    default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break;
+  }
+}
+
+/*
+Method to print the touchpad by which ESP32
+has been awaken from sleep
+*/
+void print_wakeup_touchpad(){
+  touchPin = esp_sleep_get_touchpad_wakeup_status();
+
+  switch(touchPin)
+  {
+    case 0  : Serial.println("Touch detected on GPIO 4"); break;
+    case 1  : Serial.println("Touch detected on GPIO 0"); break;
+    case 2  : Serial.println("Touch detected on GPIO 2"); break;
+    case 3  : Serial.println("Touch detected on GPIO 15"); break;
+    case 4  : Serial.println("Touch detected on GPIO 13"); break;
+    case 5  : Serial.println("Touch detected on GPIO 12"); break;
+    case 6  : Serial.println("Touch detected on GPIO 14"); break;
+    case 7  : Serial.println("Touch detected on GPIO 27"); break;
+    case 8  : Serial.println("Touch detected on GPIO 33"); break;
+    case 9  : Serial.println("Touch detected on GPIO 32"); break;
+    default : Serial.println("Wakeup not by touchpad"); break;
+  }
+}
+
+void callback(){
+  //placeholder callback function
+}
+
+void setup(){
+  Serial.begin(115200);
+  delay(1000); //Take some time to open up the Serial Monitor
+
+  //Increment boot number and print it every reboot
+  ++bootCount;
+  Serial.println("Boot number: " + String(bootCount));
+
+  //Print the wakeup reason for ESP32 and touchpad too
+  print_wakeup_reason();
+  print_wakeup_touchpad();
+
+  //Setup interrupt on Touch Pad 3 (GPIO15)
+  touchAttachInterrupt(T3, callback, Threshold);
+
+  //Configure Touchpad as wakeup source
+  esp_sleep_enable_touchpad_wakeup();
+
+  //Go to sleep now
+  Serial.println("Going to sleep now");
+  esp_deep_sleep_start();
+  Serial.println("This will never be printed");
+}
+
+void loop(){
+  //This will never be reached
+}

libraries/ESP32/examples/ESPNow/Basic/Master/Master.ino

@@ -0,0 +1,259 @@
+/**
+   ESPNOW - Basic communication - Master
+   Date: 26th September 2017
+   Author: Arvind Ravulavaru <https://github.com/arvindr21>
+   Purpose: ESPNow Communication between a Master ESP32 and a Slave ESP32
+   Description: This sketch consists of the code for the Master module.
+   Resources: (A bit outdated)
+   a. https://espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf
+   b. http://www.esploradores.com/practica-6-conexion-esp-now/
+
+   << This Device Master >>
+
+   Flow: Master
+   Step 1 : ESPNow Init on Master and set it in STA mode
+   Step 2 : Start scanning for Slave ESP32 (we have added a prefix of `slave` to the SSID of slave for an easy setup)
+   Step 3 : Once found, add Slave as peer
+   Step 4 : Register for send callback
+   Step 5 : Start Transmitting data from Master to Slave
+
+   Flow: Slave
+   Step 1 : ESPNow Init on Slave
+   Step 2 : Update the SSID of Slave with a prefix of `slave`
+   Step 3 : Set Slave in AP mode
+   Step 4 : Register for receive callback and wait for data
+   Step 5 : Once data arrives, print it in the serial monitor
+
+   Note: Master and Slave have been defined to easily understand the setup.
+         Based on the ESPNOW API, there is no concept of Master and Slave.
+         Any devices can act as master or salve.
+*/
+
+#include <esp_now.h>
+#include <WiFi.h>
+
+// Global copy of slave
+esp_now_peer_info_t slave;
+#define CHANNEL 3
+#define PRINTSCANRESULTS 0
+#define DELETEBEFOREPAIR 0
+
+// Init ESP Now with fallback
+void InitESPNow() {
+  WiFi.disconnect();
+  if (esp_now_init() == ESP_OK) {
+    Serial.println("ESPNow Init Success");
+  }
+  else {
+    Serial.println("ESPNow Init Failed");
+    // Retry InitESPNow, add a counte and then restart?
+    // InitESPNow();
+    // or Simply Restart
+    ESP.restart();
+  }
+}
+
+// Scan for slaves in AP mode
+void ScanForSlave() {
+  int8_t scanResults = WiFi.scanNetworks();
+  // reset on each scan
+  bool slaveFound = 0;
+  memset(&slave, 0, sizeof(slave));
+
+  Serial.println("");
+  if (scanResults == 0) {
+    Serial.println("No WiFi devices in AP Mode found");
+  } else {
+    Serial.print("Found "); Serial.print(scanResults); Serial.println(" devices ");
+    for (int i = 0; i < scanResults; ++i) {
+      // Print SSID and RSSI for each device found
+      String SSID = WiFi.SSID(i);
+      int32_t RSSI = WiFi.RSSI(i);
+      String BSSIDstr = WiFi.BSSIDstr(i);
+
+      if (PRINTSCANRESULTS) {
+        Serial.print(i + 1);
+        Serial.print(": ");
+        Serial.print(SSID);
+        Serial.print(" (");
+        Serial.print(RSSI);
+        Serial.print(")");
+        Serial.println("");
+      }
+      delay(10);
+      // Check if the current device starts with `Slave`
+      if (SSID.indexOf("Slave") == 0) {
+        // SSID of interest
+        Serial.println("Found a Slave.");
+        Serial.print(i + 1); Serial.print(": "); Serial.print(SSID); Serial.print(" ["); Serial.print(BSSIDstr); Serial.print("]"); Serial.print(" ("); Serial.print(RSSI); Serial.print(")"); Serial.println("");
+        // Get BSSID => Mac Address of the Slave
+        int mac[6];
+        if ( 6 == sscanf(BSSIDstr.c_str(), "%x:%x:%x:%x:%x:%x",  &mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5] ) ) {
+          for (int ii = 0; ii < 6; ++ii ) {
+            slave.peer_addr[ii] = (uint8_t) mac[ii];
+          }
+        }
+
+        slave.channel = CHANNEL; // pick a channel
+        slave.encrypt = 0; // no encryption
+
+        slaveFound = 1;
+        // we are planning to have only one slave in this example;
+        // Hence, break after we find one, to be a bit efficient
+        break;
+      }
+    }
+  }
+
+  if (slaveFound) {
+    Serial.println("Slave Found, processing..");
+  } else {
+    Serial.println("Slave Not Found, trying again.");
+  }
+
+  // clean up ram
+  WiFi.scanDelete();
+}
+
+// Check if the slave is already paired with the master.
+// If not, pair the slave with master
+bool manageSlave() {
+  if (slave.channel == CHANNEL) {
+    if (DELETEBEFOREPAIR) {
+      deletePeer();
+    }
+
+    Serial.print("Slave Status: ");
+    // check if the peer exists
+    bool exists = esp_now_is_peer_exist(slave.peer_addr);
+    if ( exists) {
+      // Slave already paired.
+      Serial.println("Already Paired");
+      return true;
+    } else {
+      // Slave not paired, attempt pair
+      esp_err_t addStatus = esp_now_add_peer(&slave);
+      if (addStatus == ESP_OK) {
+        // Pair success
+        Serial.println("Pair success");
+        return true;
+      } else if (addStatus == ESP_ERR_ESPNOW_NOT_INIT) {
+        // How did we get so far!!
+        Serial.println("ESPNOW Not Init");
+        return false;
+      } else if (addStatus == ESP_ERR_ESPNOW_ARG) {
+        Serial.println("Invalid Argument");
+        return false;
+      } else if (addStatus == ESP_ERR_ESPNOW_FULL) {
+        Serial.println("Peer list full");
+        return false;
+      } else if (addStatus == ESP_ERR_ESPNOW_NO_MEM) {
+        Serial.println("Out of memory");
+        return false;
+      } else if (addStatus == ESP_ERR_ESPNOW_EXIST) {
+        Serial.println("Peer Exists");
+        return true;
+      } else {
+        Serial.println("Not sure what happened");
+        return false;
+      }
+    }
+  } else {
+    // No slave found to process
+    Serial.println("No Slave found to process");
+    return false;
+  }
+}
+
+void deletePeer() {
+  esp_err_t delStatus = esp_now_del_peer(slave.peer_addr);
+  Serial.print("Slave Delete Status: ");
+  if (delStatus == ESP_OK) {
+    // Delete success
+    Serial.println("Success");
+  } else if (delStatus == ESP_ERR_ESPNOW_NOT_INIT) {
+    // How did we get so far!!
+    Serial.println("ESPNOW Not Init");
+  } else if (delStatus == ESP_ERR_ESPNOW_ARG) {
+    Serial.println("Invalid Argument");
+  } else if (delStatus == ESP_ERR_ESPNOW_NOT_FOUND) {
+    Serial.println("Peer not found.");
+  } else {
+    Serial.println("Not sure what happened");
+  }
+}
+
+uint8_t data = 0;
+// send data
+void sendData() {
+  data++;
+  const uint8_t *peer_addr = slave.peer_addr;
+  Serial.print("Sending: "); Serial.println(data);
+  esp_err_t result = esp_now_send(peer_addr, &data, sizeof(data));
+  Serial.print("Send Status: ");
+  if (result == ESP_OK) {
+    Serial.println("Success");
+  } else if (result == ESP_ERR_ESPNOW_NOT_INIT) {
+    // How did we get so far!!
+    Serial.println("ESPNOW not Init.");
+  } else if (result == ESP_ERR_ESPNOW_ARG) {
+    Serial.println("Invalid Argument");
+  } else if (result == ESP_ERR_ESPNOW_INTERNAL) {
+    Serial.println("Internal Error");
+  } else if (result == ESP_ERR_ESPNOW_NO_MEM) {
+    Serial.println("ESP_ERR_ESPNOW_NO_MEM");
+  } else if (result == ESP_ERR_ESPNOW_NOT_FOUND) {
+    Serial.println("Peer not found.");
+  } else {
+    Serial.println("Not sure what happened");
+  }
+}
+
+// callback when data is sent from Master to Slave
+void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
+  char macStr[18];
+  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
+           mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
+  Serial.print("Last Packet Sent to: "); Serial.println(macStr);
+  Serial.print("Last Packet Send Status: "); Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
+}
+
+void setup() {
+  Serial.begin(115200);
+  //Set device in STA mode to begin with
+  WiFi.mode(WIFI_STA);
+  Serial.println("ESPNow/Basic/Master Example");
+  // This is the mac address of the Master in Station Mode
+  Serial.print("STA MAC: "); Serial.println(WiFi.macAddress());
+  // Init ESPNow with a fallback logic
+  InitESPNow();
+  // Once ESPNow is successfully Init, we will register for Send CB to
+  // get the status of Trasnmitted packet
+  esp_now_register_send_cb(OnDataSent);
+}
+
+void loop() {
+  // In the loop we scan for slave
+  ScanForSlave();
+  // If Slave is found, it would be populate in `slave` variable
+  // We will check if `slave` is defined and then we proceed further
+  if (slave.channel == CHANNEL) { // check if slave channel is defined
+    // `slave` is defined
+    // Add slave as peer if it has not been added already
+    bool isPaired = manageSlave();
+    if (isPaired) {
+      // pair success or already paired
+      // Send data to device
+      sendData();
+    } else {
+      // slave pair failed
+      Serial.println("Slave pair failed!");
+    }
+  }
+  else {
+    // No slave found to process
+  }
+
+  // wait for 3seconds to run the logic again
+  delay(3000);
+}

libraries/ESP32/examples/ESPNow/Basic/Slave/Slave.ino

@@ -0,0 +1,91 @@
+/**
+   ESPNOW - Basic communication - Slave
+   Date: 26th September 2017
+   Author: Arvind Ravulavaru <https://github.com/arvindr21>
+   Purpose: ESPNow Communication between a Master ESP32 and a Slave ESP32
+   Description: This sketch consists of the code for the Slave module.
+   Resources: (A bit outdated)
+   a. https://espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf
+   b. http://www.esploradores.com/practica-6-conexion-esp-now/
+
+   << This Device Slave >>
+
+   Flow: Master
+   Step 1 : ESPNow Init on Master and set it in STA mode
+   Step 2 : Start scanning for Slave ESP32 (we have added a prefix of `slave` to the SSID of slave for an easy setup)
+   Step 3 : Once found, add Slave as peer
+   Step 4 : Register for send callback
+   Step 5 : Start Transmitting data from Master to Slave
+
+   Flow: Slave
+   Step 1 : ESPNow Init on Slave
+   Step 2 : Update the SSID of Slave with a prefix of `slave`
+   Step 3 : Set Slave in AP mode
+   Step 4 : Register for receive callback and wait for data
+   Step 5 : Once data arrives, print it in the serial monitor
+
+   Note: Master and Slave have been defined to easily understand the setup.
+         Based on the ESPNOW API, there is no concept of Master and Slave.
+         Any devices can act as master or salve.
+*/
+
+#include <esp_now.h>
+#include <WiFi.h>
+
+#define CHANNEL 1
+
+// Init ESP Now with fallback
+void InitESPNow() {
+  WiFi.disconnect();
+  if (esp_now_init() == ESP_OK) {
+    Serial.println("ESPNow Init Success");
+  }
+  else {
+    Serial.println("ESPNow Init Failed");
+    // Retry InitESPNow, add a counte and then restart?
+    // InitESPNow();
+    // or Simply Restart
+    ESP.restart();
+  }
+}
+
+// config AP SSID
+void configDeviceAP() {
+  const char *SSID = "Slave_1";
+  bool result = WiFi.softAP(SSID, "Slave_1_Password", CHANNEL, 0);
+  if (!result) {
+    Serial.println("AP Config failed.");
+  } else {
+    Serial.println("AP Config Success. Broadcasting with AP: " + String(SSID));
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("ESPNow/Basic/Slave Example");
+  //Set device in AP mode to begin with
+  WiFi.mode(WIFI_AP);
+  // configure device AP mode
+  configDeviceAP();
+  // This is the mac address of the Slave in AP Mode
+  Serial.print("AP MAC: "); Serial.println(WiFi.softAPmacAddress());
+  // Init ESPNow with a fallback logic
+  InitESPNow();
+  // Once ESPNow is successfully Init, we will register for recv CB to
+  // get recv packer info.
+  esp_now_register_recv_cb(OnDataRecv);
+}
+
+// callback when data is recv from Master
+void OnDataRecv(const uint8_t *mac_addr, const uint8_t *data, int data_len) {
+  char macStr[18];
+  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
+           mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
+  Serial.print("Last Packet Recv from: "); Serial.println(macStr);
+  Serial.print("Last Packet Recv Data: "); Serial.println(*data);
+  Serial.println("");
+}
+
+void loop() {
+  // Chill
+}

libraries/ESP32/examples/ESPNow/Multi-Slave/Master/Master.ino

@@ -0,0 +1,244 @@
+/**
+   ESPNOW - Basic communication - Master
+   Date: 26th September 2017
+   Author: Arvind Ravulavaru <https://github.com/arvindr21>
+   Purpose: ESPNow Communication between a Master ESP32 and multiple ESP32 Slaves
+   Description: This sketch consists of the code for the Master module.
+   Resources: (A bit outdated)
+   a. https://espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf
+   b. http://www.esploradores.com/practica-6-conexion-esp-now/
+
+   << This Device Master >>
+
+   Flow: Master
+   Step 1 : ESPNow Init on Master and set it in STA mode
+   Step 2 : Start scanning for Slave ESP32 (we have added a prefix of `slave` to the SSID of slave for an easy setup)
+   Step 3 : Once found, add Slave as peer
+   Step 4 : Register for send callback
+   Step 5 : Start Transmitting data from Master to Slave(s)
+
+   Flow: Slave
+   Step 1 : ESPNow Init on Slave
+   Step 2 : Update the SSID of Slave with a prefix of `slave`
+   Step 3 : Set Slave in AP mode
+   Step 4 : Register for receive callback and wait for data
+   Step 5 : Once data arrives, print it in the serial monitor
+
+   Note: Master and Slave have been defined to easily understand the setup.
+         Based on the ESPNOW API, there is no concept of Master and Slave.
+         Any devices can act as master or salve.
+
+
+  // Sample Serial log with 1 master & 2 slaves
+      Found 12 devices 
+      1: Slave:24:0A:C4:81:CF:A4 [24:0A:C4:81:CF:A5] (-44)
+      3: Slave:30:AE:A4:02:6D:CC [30:AE:A4:02:6D:CD] (-55)
+      2 Slave(s) found, processing..
+      Processing: 24:A:C4:81:CF:A5 Status: Already Paired
+      Processing: 30:AE:A4:2:6D:CD Status: Already Paired
+      Sending: 9
+      Send Status: Success
+      Last Packet Sent to: 24:0a:c4:81:cf:a5
+      Last Packet Send Status: Delivery Success
+      Send Status: Success
+      Last Packet Sent to: 30:ae:a4:02:6d:cd
+      Last Packet Send Status: Delivery Success
+
+*/
+
+#include <esp_now.h>
+#include <WiFi.h>
+
+// Global copy of slave
+#define NUMSLAVES 20
+esp_now_peer_info_t slaves[NUMSLAVES] = {};
+int SlaveCnt = 0;
+
+#define CHANNEL 3
+#define PRINTSCANRESULTS 0
+
+// Init ESP Now with fallback
+void InitESPNow() {
+  WiFi.disconnect();
+  if (esp_now_init() == ESP_OK) {
+    Serial.println("ESPNow Init Success");
+  }
+  else {
+    Serial.println("ESPNow Init Failed");
+    // Retry InitESPNow, add a counte and then restart?
+    // InitESPNow();
+    // or Simply Restart
+    ESP.restart();
+  }
+}
+
+// Scan for slaves in AP mode
+void ScanForSlave() {
+  int8_t scanResults = WiFi.scanNetworks();
+  //reset slaves
+  memset(slaves, 0, sizeof(slaves));
+  SlaveCnt = 0;
+  Serial.println("");
+  if (scanResults == 0) {
+    Serial.println("No WiFi devices in AP Mode found");
+  } else {
+    Serial.print("Found "); Serial.print(scanResults); Serial.println(" devices ");
+    for (int i = 0; i < scanResults; ++i) {
+      // Print SSID and RSSI for each device found
+      String SSID = WiFi.SSID(i);
+      int32_t RSSI = WiFi.RSSI(i);
+      String BSSIDstr = WiFi.BSSIDstr(i);
+
+      if (PRINTSCANRESULTS) {
+        Serial.print(i + 1); Serial.print(": "); Serial.print(SSID); Serial.print(" ["); Serial.print(BSSIDstr); Serial.print("]"); Serial.print(" ("); Serial.print(RSSI); Serial.print(")"); Serial.println("");
+      }
+      delay(10);
+      // Check if the current device starts with `Slave`
+      if (SSID.indexOf("Slave") == 0) {
+        // SSID of interest
+        Serial.print(i + 1); Serial.print(": "); Serial.print(SSID); Serial.print(" ["); Serial.print(BSSIDstr); Serial.print("]"); Serial.print(" ("); Serial.print(RSSI); Serial.print(")"); Serial.println("");
+        // Get BSSID => Mac Address of the Slave
+        int mac[6];
+
+        if ( 6 == sscanf(BSSIDstr.c_str(), "%x:%x:%x:%x:%x:%x",  &mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5] ) ) {
+          for (int ii = 0; ii < 6; ++ii ) {
+            slaves[SlaveCnt].peer_addr[ii] = (uint8_t) mac[ii];
+          }
+        }
+        slaves[SlaveCnt].channel = CHANNEL; // pick a channel
+        slaves[SlaveCnt].encrypt = 0; // no encryption
+        SlaveCnt++;
+      }
+    }
+  }
+
+  if (SlaveCnt > 0) {
+    Serial.print(SlaveCnt); Serial.println(" Slave(s) found, processing..");
+  } else {
+    Serial.println("No Slave Found, trying again.");
+  }
+
+  // clean up ram
+  WiFi.scanDelete();
+}
+
+// Check if the slave is already paired with the master.
+// If not, pair the slave with master
+void manageSlave() {
+  if (SlaveCnt > 0) {
+    for (int i = 0; i < SlaveCnt; i++) {
+      Serial.print("Processing: ");
+      for (int ii = 0; ii < 6; ++ii ) {
+        Serial.print((uint8_t) slaves[i].peer_addr[ii], HEX);
+        if (ii != 5) Serial.print(":");
+      }
+      Serial.print(" Status: ");
+      // check if the peer exists
+      bool exists = esp_now_is_peer_exist(slaves[i].peer_addr);
+      if (exists) {
+        // Slave already paired.
+        Serial.println("Already Paired");
+      } else {
+        // Slave not paired, attempt pair
+        esp_err_t addStatus = esp_now_add_peer(&slaves[i]);
+        if (addStatus == ESP_OK) {
+          // Pair success
+          Serial.println("Pair success");
+        } else if (addStatus == ESP_ERR_ESPNOW_NOT_INIT) {
+          // How did we get so far!!
+          Serial.println("ESPNOW Not Init");
+        } else if (addStatus == ESP_ERR_ESPNOW_ARG) {
+          Serial.println("Add Peer - Invalid Argument");
+        } else if (addStatus == ESP_ERR_ESPNOW_FULL) {
+          Serial.println("Peer list full");
+        } else if (addStatus == ESP_ERR_ESPNOW_NO_MEM) {
+          Serial.println("Out of memory");
+        } else if (addStatus == ESP_ERR_ESPNOW_EXIST) {
+          Serial.println("Peer Exists");
+        } else {
+          Serial.println("Not sure what happened");
+        }
+        delay(100);
+      }
+    }
+  } else {
+    // No slave found to process
+    Serial.println("No Slave found to process");
+  }
+}
+
+
+uint8_t data = 0;
+// send data
+void sendData() {
+  data++;
+  for (int i = 0; i < SlaveCnt; i++) {
+    const uint8_t *peer_addr = slaves[i].peer_addr;
+    if (i == 0) { // print only for first slave
+      Serial.print("Sending: ");
+      Serial.println(data);
+    }
+    esp_err_t result = esp_now_send(peer_addr, &data, sizeof(data));
+    Serial.print("Send Status: ");
+    if (result == ESP_OK) {
+      Serial.println("Success");
+    } else if (result == ESP_ERR_ESPNOW_NOT_INIT) {
+      // How did we get so far!!
+      Serial.println("ESPNOW not Init.");
+    } else if (result == ESP_ERR_ESPNOW_ARG) {
+      Serial.println("Invalid Argument");
+    } else if (result == ESP_ERR_ESPNOW_INTERNAL) {
+      Serial.println("Internal Error");
+    } else if (result == ESP_ERR_ESPNOW_NO_MEM) {
+      Serial.println("ESP_ERR_ESPNOW_NO_MEM");
+    } else if (result == ESP_ERR_ESPNOW_NOT_FOUND) {
+      Serial.println("Peer not found.");
+    } else {
+      Serial.println("Not sure what happened");
+    }
+    delay(100);
+  }
+}
+
+// callback when data is sent from Master to Slave
+void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
+  char macStr[18];
+  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
+           mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
+  Serial.print("Last Packet Sent to: "); Serial.println(macStr);
+  Serial.print("Last Packet Send Status: "); Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
+}
+
+void setup() {
+  Serial.begin(115200);
+  //Set device in STA mode to begin with
+  WiFi.mode(WIFI_STA);
+  Serial.println("ESPNow/Multi-Slave/Master Example");
+  // This is the mac address of the Master in Station Mode
+  Serial.print("STA MAC: "); Serial.println(WiFi.macAddress());
+  // Init ESPNow with a fallback logic
+  InitESPNow();
+  // Once ESPNow is successfully Init, we will register for Send CB to
+  // get the status of Trasnmitted packet
+  esp_now_register_send_cb(OnDataSent);
+}
+
+void loop() {
+  // In the loop we scan for slave
+  ScanForSlave();
+  // If Slave is found, it would be populate in `slave` variable
+  // We will check if `slave` is defined and then we proceed further
+  if (SlaveCnt > 0) { // check if slave channel is defined
+    // `slave` is defined
+    // Add slave as peer if it has not been added already
+    manageSlave();
+    // pair success or already paired
+    // Send data to device
+    sendData();
+  } else {
+    // No slave found to process
+  }
+
+  // wait for 3seconds to run the logic again
+  delay(1000);
+}

libraries/ESP32/examples/ESPNow/Multi-Slave/Slave/Slave.ino

@@ -0,0 +1,94 @@
+/**
+   ESPNOW - Basic communication - Slave
+   Date: 26th September 2017
+   Author: Arvind Ravulavaru <https://github.com/arvindr21>
+   Purpose: ESPNow Communication between a Master ESP32 and multiple ESP32 Slaves
+   Description: This sketch consists of the code for the Slave module.
+   Resources: (A bit outdated)
+   a. https://espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf
+   b. http://www.esploradores.com/practica-6-conexion-esp-now/
+
+   << This Device Slave >>
+
+   Flow: Master
+   Step 1 : ESPNow Init on Master and set it in STA mode
+   Step 2 : Start scanning for Slave ESP32 (we have added a prefix of `slave` to the SSID of slave for an easy setup)
+   Step 3 : Once found, add Slave as peer
+   Step 4 : Register for send callback
+   Step 5 : Start Transmitting data from Master to Slave(s)
+
+   Flow: Slave
+   Step 1 : ESPNow Init on Slave
+   Step 2 : Update the SSID of Slave with a prefix of `slave`
+   Step 3 : Set Slave in AP mode
+   Step 4 : Register for receive callback and wait for data
+   Step 5 : Once data arrives, print it in the serial monitor
+
+   Note: Master and Slave have been defined to easily understand the setup.
+         Based on the ESPNOW API, there is no concept of Master and Slave.
+         Any devices can act as master or salve.
+*/
+
+#include <esp_now.h>
+#include <WiFi.h>
+
+#define CHANNEL 1
+
+// Init ESP Now with fallback
+void InitESPNow() {
+  WiFi.disconnect();
+  if (esp_now_init() == ESP_OK) {
+    Serial.println("ESPNow Init Success");
+  }
+  else {
+    Serial.println("ESPNow Init Failed");
+    // Retry InitESPNow, add a counte and then restart?
+    // InitESPNow();
+    // or Simply Restart
+    ESP.restart();
+  }
+}
+
+// config AP SSID
+void configDeviceAP() {
+  String Prefix = "Slave:";
+  String Mac = WiFi.macAddress();
+  String SSID = Prefix + Mac;
+  String Password = "123456789";
+  bool result = WiFi.softAP(SSID.c_str(), Password.c_str(), CHANNEL, 0);
+  if (!result) {
+    Serial.println("AP Config failed.");
+  } else {
+    Serial.println("AP Config Success. Broadcasting with AP: " + String(SSID));
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("ESPNow/Basic/Slave Example");
+  //Set device in AP mode to begin with
+  WiFi.mode(WIFI_AP);
+  // configure device AP mode
+  configDeviceAP();
+  // This is the mac address of the Slave in AP Mode
+  Serial.print("AP MAC: "); Serial.println(WiFi.softAPmacAddress());
+  // Init ESPNow with a fallback logic
+  InitESPNow();
+  // Once ESPNow is successfully Init, we will register for recv CB to
+  // get recv packer info.
+  esp_now_register_recv_cb(OnDataRecv);
+}
+
+// callback when data is recv from Master
+void OnDataRecv(const uint8_t *mac_addr, const uint8_t *data, int data_len) {
+  char macStr[18];
+  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
+           mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
+  Serial.print("Last Packet Recv from: "); Serial.println(macStr);
+  Serial.print("Last Packet Recv Data: "); Serial.println(*data);
+  Serial.println("");
+}
+
+void loop() {
+  // Chill
+}

libraries/ESP32/examples/FreeRTOS/FreeRTOS.ino

@@ -0,0 +1,97 @@
+#if CONFIG_FREERTOS_UNICORE
+#define ARDUINO_RUNNING_CORE 0
+#else
+#define ARDUINO_RUNNING_CORE 1
+#endif
+
+#ifndef LED_BUILTIN
+#define LED_BUILTIN 13
+#endif
+
+// define two tasks for Blink & AnalogRead
+void TaskBlink( void *pvParameters );
+void TaskAnalogReadA3( void *pvParameters );
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  
+  // initialize serial communication at 115200 bits per second:
+  Serial.begin(115200);
+  
+  // Now set up two tasks to run independently.
+  xTaskCreatePinnedToCore(
+    TaskBlink
+    ,  "TaskBlink"   // A name just for humans
+    ,  1024  // This stack size can be checked & adjusted by reading the Stack Highwater
+    ,  NULL
+    ,  2  // Priority, with 3 (configMAX_PRIORITIES - 1) being the highest, and 0 being the lowest.
+    ,  NULL 
+    ,  ARDUINO_RUNNING_CORE);
+
+  xTaskCreatePinnedToCore(
+    TaskAnalogReadA3
+    ,  "AnalogReadA3"
+    ,  1024  // Stack size
+    ,  NULL
+    ,  1  // Priority
+    ,  NULL 
+    ,  ARDUINO_RUNNING_CORE);
+
+  // Now the task scheduler, which takes over control of scheduling individual tasks, is automatically started.
+}
+
+void loop()
+{
+  // Empty. Things are done in Tasks.
+}
+
+/*--------------------------------------------------*/
+/*---------------------- Tasks ---------------------*/
+/*--------------------------------------------------*/
+
+void TaskBlink(void *pvParameters)  // This is a task.
+{
+  (void) pvParameters;
+
+/*
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+    
+  If you want to know what pin the on-board LED is connected to on your ESP32 model, check
+  the Technical Specs of your board.
+*/
+
+  // initialize digital LED_BUILTIN on pin 13 as an output.
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  for (;;) // A Task shall never return or exit.
+  {
+    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
+    vTaskDelay(100);  // one tick delay (15ms) in between reads for stability
+    digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
+    vTaskDelay(100);  // one tick delay (15ms) in between reads for stability
+  }
+}
+
+void TaskAnalogReadA3(void *pvParameters)  // This is a task.
+{
+  (void) pvParameters;
+  
+/*
+  AnalogReadSerial
+  Reads an analog input on pin A3, prints the result to the serial monitor.
+  Graphical representation is available using serial plotter (Tools > Serial Plotter menu)
+  Attach the center pin of a potentiometer to pin A3, and the outside pins to +5V and ground.
+
+  This example code is in the public domain.
+*/
+
+  for (;;)
+  {
+    // read the input on analog pin A3:
+    int sensorValueA3 = analogRead(A3);
+    // print out the value you read:
+    Serial.println(sensorValueA3);
+    vTaskDelay(10);  // one tick delay (15ms) in between reads for stability
+  }
+}

libraries/ESP32/examples/GPIO/FunctionalInterrupt/FunctionalInterrupt.ino

@@ -0,0 +1,47 @@
+#include <Arduino.h>
+#include <FunctionalInterrupt.h>
+
+#define BUTTON1 16
+#define BUTTON2 17
+
+class Button
+{
+public:
+	Button(uint8_t reqPin) : PIN(reqPin){
+		pinMode(PIN, INPUT_PULLUP);
+		attachInterrupt(PIN, std::bind(&Button::isr,this), FALLING);
+	};
+	~Button() {
+		detachInterrupt(PIN);
+	}
+
+	void ARDUINO_ISR_ATTR isr() {
+		numberKeyPresses += 1;
+		pressed = true;
+	}
+
+	void checkPressed() {
+		if (pressed) {
+			Serial.printf("Button on pin %u has been pressed %u times\n", PIN, numberKeyPresses);
+			pressed = false;
+		}
+	}
+
+private:
+	const uint8_t PIN;
+    volatile uint32_t numberKeyPresses;
+    volatile bool pressed;
+};
+
+Button button1(BUTTON1);
+Button button2(BUTTON2);
+
+
+void setup() {
+    Serial.begin(115200);
+}
+
+void loop() {
+	button1.checkPressed();
+	button2.checkPressed();
+}

libraries/ESP32/examples/GPIO/GPIOInterrupt/GPIOInterrupt.ino

@@ -0,0 +1,45 @@
+#include <Arduino.h>
+
+struct Button {
+    const uint8_t PIN;
+    uint32_t numberKeyPresses;
+    bool pressed;
+};
+
+Button button1 = {23, 0, false};
+Button button2 = {18, 0, false};
+
+void ARDUINO_ISR_ATTR isr(void* arg) {
+    Button* s = static_cast<Button*>(arg);
+    s->numberKeyPresses += 1;
+    s->pressed = true;
+}
+
+void ARDUINO_ISR_ATTR isr() {
+    button2.numberKeyPresses += 1;
+    button2.pressed = true;
+}
+
+void setup() {
+    Serial.begin(115200);
+    pinMode(button1.PIN, INPUT_PULLUP);
+    attachInterruptArg(button1.PIN, isr, &button1, FALLING);
+    pinMode(button2.PIN, INPUT_PULLUP);
+    attachInterrupt(button2.PIN, isr, FALLING);
+}
+
+void loop() {
+    if (button1.pressed) {
+        Serial.printf("Button 1 has been pressed %u times\n", button1.numberKeyPresses);
+        button1.pressed = false;
+    }
+    if (button2.pressed) {
+        Serial.printf("Button 2 has been pressed %u times\n", button2.numberKeyPresses);
+        button2.pressed = false;
+    }
+    static uint32_t lastMillis = 0;
+    if (millis() - lastMillis > 10000) {
+      lastMillis = millis();
+      detachInterrupt(button1.PIN);
+    }
+}

libraries/ESP32/examples/HallSensor/HallSensor.ino

@@ -0,0 +1,15 @@
+//Simple sketch to access the internal hall effect detector on the esp32.
+//values can be quite low. 
+//Brian Degger / @sctv  
+int val = 0;
+void setup() {
+  Serial.begin(9600);
+    }
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  val = hallRead();
+  // print the results to the serial monitor:
+  //Serial.print("sensor = ");
+  Serial.println(val);//to graph 
+}

libraries/ESP32/examples/I2S/HiFreq_ADC/HiFreq_ADC.ino

@@ -0,0 +1,83 @@
+/*
+ * This is an example to read analog data at high frequency using the I2S peripheral
+ * Run a wire between pins 27 & 32
+ * The readings from the device will be 12bit (0-4096) 
+ */
+#include <driver/i2s.h>
+
+#define I2S_SAMPLE_RATE 78125
+#define ADC_INPUT ADC1_CHANNEL_4 //pin 32
+#define OUTPUT_PIN 27
+#define OUTPUT_VALUE 3800
+#define READ_DELAY 9000 //microseconds
+
+uint16_t adc_reading;
+
+void i2sInit()
+{
+   i2s_config_t i2s_config = {
+    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_ADC_BUILT_IN),
+    .sample_rate =  I2S_SAMPLE_RATE,              // The format of the signal using ADC_BUILT_IN
+    .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT, // is fixed at 12bit, stereo, MSB
+    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
+    .communication_format = I2S_COMM_FORMAT_I2S_MSB,
+    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
+    .dma_buf_count = 4,
+    .dma_buf_len = 8,
+    .use_apll = false,
+    .tx_desc_auto_clear = false,
+    .fixed_mclk = 0
+   };
+   i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
+   i2s_set_adc_mode(ADC_UNIT_1, ADC_INPUT);
+   i2s_adc_enable(I2S_NUM_0);
+}
+
+void reader(void *pvParameters) {
+  uint32_t read_counter = 0;
+  uint64_t read_sum = 0;
+// The 4 high bits are the channel, and the data is inverted
+  uint16_t offset = (int)ADC_INPUT * 0x1000 + 0xFFF;
+  size_t bytes_read;
+  while(1){
+    uint16_t buffer[2] = {0};
+    i2s_read(I2S_NUM_0, &buffer, sizeof(buffer), &bytes_read, 15);
+    //Serial.printf("%d  %d\n", offset - buffer[0], offset - buffer[1]);
+    if (bytes_read == sizeof(buffer)) {
+      read_sum += offset - buffer[0];
+      read_sum += offset - buffer[1];
+      read_counter++;
+    } else {
+      Serial.println("buffer empty");
+    }
+    if (read_counter == I2S_SAMPLE_RATE) {
+      adc_reading = read_sum / I2S_SAMPLE_RATE / 2;
+      //Serial.printf("avg: %d millis: ", adc_reading);
+      //Serial.println(millis());
+      read_counter = 0;
+      read_sum = 0;
+      i2s_adc_disable(I2S_NUM_0);
+      delay(READ_DELAY);
+      i2s_adc_enable(I2S_NUM_0);
+    }
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  // Put a signal out on pin 
+  uint32_t freq = ledcSetup(0, I2S_SAMPLE_RATE, 10);
+  Serial.printf("Output frequency: %d\n", freq);
+  ledcWrite(0, OUTPUT_VALUE/4);
+  ledcAttachPin(OUTPUT_PIN, 0);
+  // Initialize the I2S peripheral
+  i2sInit();
+  // Create a task that will read the data
+  xTaskCreatePinnedToCore(reader, "ADC_reader", 2048, NULL, 1, NULL, 1);
+}
+
+void loop() {
+  delay(1020);
+  Serial.printf("ADC reading: %d\n", adc_reading);
+  delay(READ_DELAY);
+}

libraries/ESP32/examples/RMT/RMTCallback/RMTCallback.ino

@@ -0,0 +1,64 @@
+#include "Arduino.h"
+#include "esp32-hal.h"
+
+extern "C" void receive_trampoline(uint32_t *data, size_t len, void * arg);
+
+class MyProcessor {
+  private:
+    rmt_obj_t* rmt_recv = NULL;
+    float realNanoTick;
+    uint32_t buff; // rolling buffer of most recent 32 bits.
+    int at = 0;
+
+  public:
+    MyProcessor(uint8_t pin, float nanoTicks) {
+      assert((rmt_recv = rmtInit(21, false, RMT_MEM_192)));
+
+      realNanoTick = rmtSetTick(rmt_recv, nanoTicks);
+    };
+    void begin() {
+      rmtRead(rmt_recv, receive_trampoline, this);
+    };
+
+    void process(rmt_data_t *data, size_t len) {
+      for (int i = 0; len; len--) {
+        if (data[i].duration0 == 0)
+          break;
+        buff = (buff << 1) | (data[i].level0 ? 1 : 0);
+        i++;
+
+        if (data[i].duration1 == 0)
+          break;
+        buff = (buff << 1) | (data[i].level1 ? 1 : 0);
+        i++;
+      };
+    };
+    uint32_t val() {
+      return buff;
+    }
+};
+
+void receive_trampoline(uint32_t *data, size_t len, void * arg)
+{
+  MyProcessor * p = (MyProcessor *)arg;
+  p->process((rmt_data_t*) data, len);
+}
+
+// Attach 3 processors to GPIO 4, 5 and 10 with different tick/speeds.
+MyProcessor mp1 = MyProcessor(4, 1000);
+MyProcessor mp2 = MyProcessor(5, 1000);
+MyProcessor mp3 = MyProcessor(10, 500);
+
+void setup()
+{
+  Serial.begin(115200);
+  mp1.begin();
+  mp2.begin();
+  mp3.begin();
+}
+
+void loop()
+{
+  Serial.printf("GPIO 4: %08x 5: %08x 6: %08x\n", mp1.val(), mp2.val(), mp3.val());
+  delay(500);
+}

libraries/ESP32/examples/RMT/RMTLoopback/RMTLoopback.ino

@@ -0,0 +1,62 @@
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
+#include "Arduino.h"
+
+#include "esp32-hal.h"
+
+rmt_data_t my_data[256];
+rmt_data_t data[256];
+
+rmt_obj_t* rmt_send = NULL;
+rmt_obj_t* rmt_recv = NULL;
+
+static EventGroupHandle_t events;
+
+void setup() 
+{
+    Serial.begin(115200);
+    events = xEventGroupCreate();
+    
+    if ((rmt_send = rmtInit(18, true, RMT_MEM_64)) == NULL)
+    {
+        Serial.println("init sender failed\n");
+    }
+    if ((rmt_recv = rmtInit(21, false, RMT_MEM_192)) == NULL)
+    {
+        Serial.println("init receiver failed\n");
+    }
+
+    float realTick = rmtSetTick(rmt_send, 100);
+    printf("real tick set to: %fns\n", realTick);
+
+}
+
+void loop() 
+{
+    // Init data
+    int i;
+    for (i=0; i<255; i++) {
+        data[i].val = 0x80010001 + ((i%13)<<16) + 13-(i%13);
+    }
+    data[255].val = 0;
+
+    // Start receiving
+    rmtReadAsync(rmt_recv, my_data, 100, events, false, 0);
+
+    // Send in continous mode
+    rmtWrite(rmt_send, data, 100);
+
+    // Wait for data
+    xEventGroupWaitBits(events, RMT_FLAG_RX_DONE, 1, 1, portMAX_DELAY);
+
+    // Printout the received data plus the original values
+    for (i=0; i<60; i++)
+    {
+        Serial.printf("%08x=%08x ", my_data[i].val, data[i].val );
+        if (!((i+1)%4)) Serial.println("\n");
+    }
+    Serial.println("\n");
+
+    delay(2000);
+}