Merge pull request #60 from valeros/develop

Add STM32 platform with CMSIS, SPL and OpenCM3 frameworks

examples/stm32/stm32-cmsis-blink/platformio.ini

@@ -0,0 +1,24 @@
+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+
+[env:stm32]
+platform = stm32
+framework = cmsis
+board = stm32ldiscovery

examples/stm32/stm32-cmsis-blink/src/main.c

@@ -0,0 +1,27 @@
+#include "stm32l1xx.h"
+
+void ms_delay(int ms)
+{
+   while (ms-- > 0) {
+      volatile int x=500;
+      while (x-- > 0)
+         __asm("nop");
+   }
+}
+
+
+//Alternates blue and green LEDs quickly
+int main(void)
+{
+    RCC->AHBENR |= RCC_AHBENR_GPIOBEN; 		 // enable the clock to GPIOB
+    GPIOB->MODER |= (1 << 12);             // set pin 6 to be general purpose output
+    GPIOB->MODER |= (1 << 14);             // set pin 7 to be general purpose output
+
+    GPIOB->ODR |= (1 << 7);           			// Set the pin 7 high
+
+    for (;;) {
+       ms_delay(100);
+       GPIOB->ODR ^= (1 << 6);           // Toggle the pin 
+       GPIOB->ODR ^= (1 << 7);           // Toggle the pin 
+    }
+}

examples/stm32/stm32-opencm3-blink/platformio.ini

@@ -0,0 +1,23 @@
+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[env:stm32]
+platform = stm32
+board = stm32ldiscovery
+framework = opencm3

examples/stm32/stm32-opencm3-blink/src/main.c

@@ -0,0 +1,70 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+static void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	/* Manually: */
+	//RCC_AHBENR |= RCC_AHBENR_GPIOBEN;
+	/* Using API functions: */
+	rcc_periph_clock_enable(RCC_GPIOB);
+
+	/* Set GPIO6 (in GPIO port B) to 'output push-pull'. */
+	/* Using API functions: */
+	gpio_mode_setup(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO6);
+}
+
+int main(void)
+{
+	int i;
+
+	gpio_setup();
+
+	/* Blink the LED (PB6) on the board. */
+	while (1) {
+		/* Manually: */
+		// GPIOB_BSRR = GPIO6;		/* LED off */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+		// GPIOB_BRR = GPIO6;		/* LED on */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+
+		/* Using API functions gpio_set()/gpio_clear(): */
+		// gpio_set(GPIOB, GPIO6);	/* LED off */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+		// gpio_clear(GPIOB, GPIO6);	/* LED on */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+
+		/* Using API function gpio_toggle(): */
+		gpio_toggle(GPIOB, GPIO6);	/* LED on/off */
+		for (i = 0; i < 1000000; i++) {	/* Wait a bit. */
+			__asm__("nop");
+		}
+	}
+
+	return 0;
+}

examples/stm32/stm32-spl-blink/platformio.ini

@@ -0,0 +1,24 @@
+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+
+[env:stm32]
+platform = stm32
+framework = cmsis,spl
+board = stm32ldiscovery

examples/stm32/stm32-spl-blink/src/main.c

@@ -0,0 +1,49 @@
+#include <stm32l1xx_gpio.h>
+#include <stm32l1xx_rcc.h>
+#include <misc.h>
+
+/* timing is not guaranteed :) */
+void simple_delay(uint32_t us)
+{
+	/* simple delay loop */
+	while (us--) {
+		asm volatile ("nop");
+	}
+}
+
+/* system entry point */
+int main(void)
+{
+	/* gpio init struct */
+	GPIO_InitTypeDef gpio;
+
+	/* reset rcc */
+	RCC_DeInit();
+
+	/* enable clock to GPIOB */
+	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
+
+	/* use pin 7 */
+	gpio.GPIO_Pin = GPIO_Pin_7;
+	/* mode: output */
+	gpio.GPIO_Mode = GPIO_Mode_OUT;
+	/* output type: push-pull */
+	gpio.GPIO_OType = GPIO_OType_PP;
+	/* apply configuration */
+	GPIO_Init(GPIOB, &gpio);
+
+	/* main program loop */
+	for (;;) {
+		/* set led on */
+		GPIO_SetBits(GPIOB, GPIO_Pin_7);
+		/* delay */
+		simple_delay(100000);
+		/* clear led */
+		GPIO_ResetBits(GPIOB, GPIO_Pin_7);
+		/* delay */
+		simple_delay(100000);
+	}
+
+	/* never reached */
+	return 0;
+}

examples/titiva/titiva-energia-blink/platformio.ini

@@ -0,0 +1,23 @@
+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[env:launchpad_tm4c1230c3pm]
+platform = titiva
+framework = energia
+board = lptm4c1230c3pm

examples/titiva/titiva-energia-blink/src/main.cpp

@@ -0,0 +1,19 @@
+/**
+ * Copyright (C) Ivan Kravets <me@ikravets.com>
+ * See LICENSE for details.
+ */
+
+#include "Energia.h"
+
+void setup()
+{
+  pinMode(GREEN_LED, OUTPUT);     // set pin as output
+}
+
+void loop()
+{
+  digitalWrite(GREEN_LED, HIGH);  // set the LED on
+  delay(1000);                  // wait for a second
+  digitalWrite(GREEN_LED, LOW);   // set the LED off
+  delay(1000);                  // wait for a second
+}

examples/titiva/titiva-native-blink/platformio.ini

@@ -21,4 +21,3 @@
 platform = titiva
 framework = energia
 board = lplm4f120h5qr
-targets = upload

examples/titiva/titiva-opencm3-blink/platformio.ini

@@ -0,0 +1,23 @@
+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[env:launchpad_lm4f120]
+platform = titiva
+framework = opencm3
+board = lplm4f120h5qr

examples/titiva/titiva-opencm3-blink/src/main.c

@@ -0,0 +1,206 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
+ * Copyright (C) 2012-2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \addtogroup Examples
+ *
+ * Flashes the Red, Green and Blue diodes on the board, in order.
+ *
+ * RED controlled by PF1
+ * Green controlled by PF3
+ * Blue controlled by PF2
+ */
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/lm4f/systemcontrol.h>
+#include <libopencm3/lm4f/rcc.h>
+#include <libopencm3/lm4f/gpio.h>
+#include <libopencm3/lm4f/nvic.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+
+/* This is how the RGB LED is connected on the stellaris launchpad */
+#define RGB_PORT	GPIOF
+enum {
+	LED_R	= GPIO1,
+	LED_G	= GPIO3,
+	LED_B	= GPIO2,
+};
+
+/* This is how the user switches are connected to GPIOF */
+enum {
+	USR_SW1	= GPIO4,
+	USR_SW2	= GPIO0,
+};
+
+/* The divisors we loop through when the user presses SW2 */
+enum {
+	PLL_DIV_80MHZ 	= 5,
+	PLL_DIV_57MHZ 	= 7,
+	PLL_DIV_40MHZ 	= 10,
+	PLL_DIV_20MHZ 	= 20,
+	PLL_DIV_16MHZ 	= 25,
+};
+
+static const uint8_t plldiv[] = {
+	PLL_DIV_80MHZ,
+	PLL_DIV_57MHZ,
+	PLL_DIV_40MHZ,
+	PLL_DIV_20MHZ,
+	PLL_DIV_16MHZ,
+	0
+};
+/* The PLL divisor we are currently on */
+static size_t ipll = 0;
+/* Are we bypassing the PLL, or not? */
+static bool bypass = false;
+
+/*
+ * Clock setup:
+ * Take the main crystal oscillator at 16MHz, run it through the PLL, and divide
+ * the 400MHz PLL clock to get a system clock of 80MHz.
+ */
+static void clock_setup(void)
+{
+	rcc_sysclk_config(OSCSRC_MOSC, XTAL_16M, PLL_DIV_80MHZ);
+}
+
+/*
+ * GPIO setup:
+ * Enable the pins driving the RGB LED as outputs.
+ */
+static void gpio_setup(void)
+{
+	/*
+	 * Configure GPIOF
+	 * This port is used to control the RGB LED
+	 */
+	periph_clock_enable(RCC_GPIOF);
+	const uint32_t outpins = (LED_R | LED_G | LED_B);
+
+	gpio_mode_setup(RGB_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, outpins);
+	gpio_set_output_config(RGB_PORT, GPIO_OTYPE_PP, GPIO_DRIVE_2MA, outpins);
+
+	/*
+	 * Now take care of our buttons
+	 */
+	const uint32_t btnpins = USR_SW1 | USR_SW2;
+
+	/*
+	 * PF0 is a locked by default. We need to unlock it before we can
+	 * re-purpose it as a GPIO pin.
+	 */
+	gpio_unlock_commit(GPIOF, USR_SW2);
+	/* Configure pins as inputs, with pull-up. */
+	gpio_mode_setup(GPIOF, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, btnpins);
+}
+
+/*
+ * IRQ setup:
+ * Trigger an interrupt whenever a button is depressed.
+ */
+static void irq_setup(void)
+{
+	const uint32_t btnpins = USR_SW1 | USR_SW2;
+	/* Trigger interrupt on rising-edge (when button is depressed) */
+	gpio_configure_trigger(GPIOF, GPIO_TRIG_EDGE_RISE, btnpins);
+	/* Finally, Enable interrupt */
+	gpio_enable_interrupts(GPIOF, btnpins);
+	/* Enable the interrupt in the NVIC as well */
+	nvic_enable_irq(NVIC_GPIOF_IRQ);
+}
+
+#define FLASH_DELAY 800000
+static void delay(void)
+{
+	int i;
+	for (i = 0; i < FLASH_DELAY; i++)       /* Wait a bit. */
+		__asm__("nop");
+}
+
+int main(void)
+{
+	gpio_enable_ahb_aperture();
+	clock_setup();
+	gpio_setup();
+	irq_setup();
+
+	/* Blink each color of the RGB LED in order. */
+	while (1) {
+		/*
+		 * Flash the Red diode
+		 */
+		gpio_set(RGB_PORT, LED_R);
+		delay(); /* Wait a bit. */
+		gpio_clear(RGB_PORT, LED_R);
+		delay(); /* Wait a bit. */
+
+		/*
+		 * Flash the Green diode
+		 */
+		gpio_set(RGB_PORT, LED_G);
+		delay(); /* Wait a bit. */
+		gpio_clear(RGB_PORT, LED_G);
+		delay(); /* Wait a bit. */
+
+		/*
+		 * Flash the Blue diode
+		 */
+		gpio_set(RGB_PORT, LED_B);
+		delay(); /* Wait a bit. */
+		gpio_clear(RGB_PORT, LED_B);
+		delay(); /* Wait a bit. */
+	}
+
+	return 0;
+}
+
+void gpiof_isr(void)
+{
+	if (gpio_is_interrupt_source(GPIOF, USR_SW1)) {
+		/* SW1 was just depressed */
+		bypass = !bypass;
+		if (bypass) {
+			rcc_pll_bypass_enable();
+			/*
+			 * The divisor is still applied to the raw clock.
+			 * Disable the divisor, or we'll divide the raw clock.
+			 */
+			SYSCTL_RCC &= ~SYSCTL_RCC_USESYSDIV;
+		}
+		else
+		{
+			rcc_change_pll_divisor(plldiv[ipll]);
+		}
+		/* Clear interrupt source */
+		gpio_clear_interrupt_flag(GPIOF, USR_SW1);
+	}
+
+	if (gpio_is_interrupt_source(GPIOF, USR_SW2)) {
+		/* SW2 was just depressed */
+		if (!bypass) {
+			if (plldiv[++ipll] == 0)
+				ipll = 0;
+			rcc_change_pll_divisor(plldiv[ipll]);
+		}
+		/* Clear interrupt source */
+		gpio_clear_interrupt_flag(GPIOF, USR_SW2);
+	}
+} 

platformio/boards/stm32.json

@@ -0,0 +1,50 @@
+{
+    "stm32f4discovery": {
+        "build": {
+            "core": "stm32",
+            "f_cpu": "168000000L",
+            "ldscript": "stm32f405x6.ld",
+            "mcu": "cortex-m4",
+            "variant": "stm32f4",
+            "extra_flags": "-DSTM32F40_41xxx"
+        },
+        "name": "STM32F4Discovery (168 MHz) with digital accelerometer, digital microphone, audio DAC",
+        "platform": "stm32",
+        "upload": {
+            "maximum_ram_size": 131071,
+            "maximum_size": 1048575
+        }
+    },
+    "stm32ldiscovery": {
+        "build": {
+            "core": "stm32",
+            "f_cpu": "32000000L",
+            "ldscript": "stm32l15xx6.ld",
+            "mcu": "cortex-m3",
+            "variant": "stm32l1",
+            "extra_flags": "-DSTM32L1XX_MD"
+        },
+        "name": "STM32LDiscovery (32 MHz) ultra low-power development kit",
+        "platform": "stm32",
+        "upload": {
+            "maximum_ram_size": 16384,
+            "maximum_size": 131072
+        }
+    },
+    "stm32f3discovery": {
+        "build": {
+            "core": "stm32",
+            "f_cpu": "72000000L",
+            "ldscript": "stm32f30xx.ld",
+            "mcu": "cortex-m4",
+            "variant": "stm32f3",
+            "extra_flags": "-DSTM32F303xC"
+        },
+        "name": "STM32F3Discovery (72 MHz) with accelerometer, gyroscope and e-compass",
+        "platform": "stm32",
+        "upload": {
+            "maximum_ram_size": 262144,
+            "maximum_size": 131072
+        }
+    }
+}

platformio/builder/main.py

@@ -7,7 +7,7 @@ except ImportError:
     import sys
     for _path in sys.path:
         if "platformio" in _path:
-            sys.path.insert(0, _path[:_path.rfind("platformio")-1])
+            sys.path.insert(0, _path[:_path.rfind("platformio") - 1])
             break
     from platformio import util
 
@@ -84,6 +84,15 @@ if "BOARD" in env:
         env.Replace(UPLOAD_PROTOCOL="${BOARD_OPTIONS['upload']['protocol']}")
     if "UPLOAD_SPEED" not in env:
         env.Replace(UPLOAD_SPEED="${BOARD_OPTIONS['upload']['speed']}")
+    # specific linker script
+    if "ldscript" in env.get("BOARD_OPTIONS", {}).get("build", {}):
+        env.Replace(
+            LINKFLAGS=["-T", join(
+                "$PIOHOME_DIR", "packages", "ldscripts",
+                "${BOARD_OPTIONS['build']['ldscript']}")]
+        )
+    if "extra_flags" in env.get("BOARD_OPTIONS", {}).get("build", {}):
+        env.MergeFlags(env.subst("${BOARD_OPTIONS['build']['extra_flags']}"))
 
 if "IGNORE_LIBS" in env:
     env['IGNORE_LIBS'] = [l.strip() for l in env['IGNORE_LIBS'].split(",")]

platformio/builder/scripts/frameworks/cmsis.py

@@ -0,0 +1,42 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+"""
+    Build script for CMSIS Framework.
+"""
+
+from os.path import join
+
+from SCons.Script import Import, Return
+
+
+env = None
+Import("env")
+
+env.VariantDir(
+    join("$BUILD_DIR", "FrameworkCMSIS"),
+    join("$PIOPACKAGES_DIR", "framework-cmsis",
+         "cores", "${BOARD_OPTIONS['build']['core']}")
+)
+
+env.Append(
+    CPPPATH=[
+        join("$BUILD_DIR", "FrameworkCMSIS"),
+        join("$BUILD_DIR", "FrameworkCMSISVariant")
+    ]
+)
+
+envsafe = env.Clone()
+
+#
+# Target: Build Core Library
+#
+
+libs = []
+libs.append(envsafe.BuildLibrary(
+    join("$BUILD_DIR", "FrameworkCMSISVariant"),
+    join("$PIOPACKAGES_DIR", "framework-cmsis", "variants",
+         "${BOARD_OPTIONS['build']['variant']}")
+))
+
+Return("env libs")

platformio/builder/scripts/frameworks/energia.py

@@ -33,16 +33,11 @@ env.Append(
     ]
 )
 
-# specific linker script for TIVA devices
-if "ldscript" in env.subst("${BOARD_OPTIONS['build']}"):
+if env.get("BOARD_OPTIONS", {}).get("build", {}).get("core") == "lm4f":
     env.Append(
-        LINKFLAGS=["-T", join(
-            "$PLATFORMFW_DIR", "cores",
-            "${BOARD_OPTIONS['build']['core']}",
-            "${BOARD_OPTIONS['build']['ldscript']}")]
+        LINKFLAGS=["-Wl,--entry=ResetISR"]
     )
 
-
 #
 # Target: Build Core Library
 #

platformio/builder/scripts/frameworks/opencm3.py

@@ -0,0 +1,172 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+"""
+    Build script for OpenCM3 Framework.
+"""
+
+import re
+from os import listdir, sep, walk
+from os.path import isfile, join, normpath
+
+from SCons.Script import Import, Return
+
+from platformio.util import exec_command
+
+
+env = None
+Import("env")
+BOARD_BUILDOPTS = env.get("BOARD_OPTIONS", {}).get("build", {})
+
+
+def find_ldscript(src_dir):
+    ldscript = None
+    matches = []
+    for item in listdir(src_dir):
+        _path = join(src_dir, item)
+        if not isfile(_path) or not item.endswith(".ld"):
+            continue
+        matches.append(_path)
+
+    if len(matches) == 1:
+        ldscript = matches[0]
+    elif isfile(join(src_dir, BOARD_BUILDOPTS['ldscript'])):
+        ldscript = join(src_dir, BOARD_BUILDOPTS['ldscript'])
+
+    assert isfile(ldscript)
+    return ldscript
+
+
+def generate_nvic_files():
+    fw_dir = join(env.get("PIOHOME_DIR"), "packages", "framework-opencm3")
+
+    for root, _, files in walk(join(fw_dir, "include", "libopencm3")):
+        if "irq.json" not in files or isfile(join(root, "nvic.h")):
+            continue
+
+        exec_command(
+            ["python", join("scripts", "irq2nvic_h"),
+             join("." + root.replace(fw_dir, ""),
+                  "irq.json").replace("\\", "/")],
+            cwd=fw_dir
+        )
+
+
+def parse_makefile_data(makefile):
+    data = {"includes": [], "objs": [], "vpath": ["./"]}
+
+    with open(makefile) as f:
+        content = f.read()
+
+        # fetch "includes"
+        re_include = re.compile(r"^include\s+([^\r\n]+)", re.M)
+        for match in re_include.finditer(content):
+            data['includes'].append(match.group(1))
+
+        # fetch "vpath"s
+        re_vpath = re.compile(r"^VPATH\s+\+?=\s+([^\r\n]+)", re.M)
+        for match in re_vpath.finditer(content):
+            data['vpath'] += match.group(1).split(":")
+
+        # fetch obj files
+        objs_match = re.search(
+            r"^OBJS\s+\+?=\s+([^\.]+\.o\s*(?:\s+\\s+)?)+", content, re.M)
+        assert objs_match
+        data['objs'] = re.sub(
+            r"(OBJS|[\+=\\\s]+)", "\n", objs_match.group(0)).split()
+    return data
+
+
+def get_source_files(src_dir):
+    mkdata = parse_makefile_data(join(src_dir, "Makefile"))
+
+    for include in mkdata['includes']:
+        _mkdata = parse_makefile_data(normpath(join(src_dir, include)))
+        for key, value in _mkdata.iteritems():
+            for v in value:
+                if v not in mkdata[key]:
+                    mkdata[key].append(v)
+
+    sources = []
+    lib_root = env.subst(
+        join(env.get("PIOHOME_DIR"), "packages", "framework-opencm3"))
+    for obj_file in mkdata['objs']:
+        src_file = obj_file[:-1] + "c"
+        for search_path in mkdata['vpath']:
+            src_path = normpath(join(src_dir, search_path, src_file))
+            if isfile(src_path):
+                sources.append(join("$BUILD_DIR", "FrameworkOpenCM3",
+                                    src_path.replace(lib_root + sep, "")))
+                break
+    return sources
+
+
+def merge_ld_scripts(main_ld_file):
+
+    def _include_callback(match):
+        included_ld_file = match.group(1)
+        # search included ld file in lib directories
+        for root, _, files in walk(join(
+                env.get("PIOHOME_DIR"), "packages",
+                "framework-opencm3", "lib")):
+
+            if included_ld_file not in files:
+                continue
+            with open(join(root, included_ld_file)) as fp:
+                return fp.read()
+
+        return match.group(0)
+
+    content = ""
+    with open(main_ld_file) as f:
+        content = f.read()
+
+    incre = re.compile(r"^INCLUDE\s+\"?([^\.]+\.ld)\"?", re.M)
+    with open(main_ld_file, "w") as f:
+        f.write(incre.sub(_include_callback, content))
+
+#
+# Processing ...
+#
+
+if BOARD_BUILDOPTS.get("core") == "lm4f":
+    env.Append(
+        CPPDEFINES=["LM4F"]
+    )
+
+env.VariantDir(
+    join("$BUILD_DIR", "FrameworkOpenCM3Variant"),
+    join("$PIOPACKAGES_DIR", "framework-opencm3", "include")
+)
+
+env.Append(
+    CPPPATH=[
+        join("$BUILD_DIR", "FrameworkOpenCM3"),
+        join("$BUILD_DIR", "FrameworkOpenCM3Variant")
+    ]
+)
+
+root_dir = join(env.get("PIOHOME_DIR"), "packages", "framework-opencm3", "lib",
+                BOARD_BUILDOPTS.get("core"))
+if BOARD_BUILDOPTS.get("core") == "stm32":
+    root_dir = join(root_dir, BOARD_BUILDOPTS.get("variant")[-2:])
+
+ldscript_path = find_ldscript(root_dir)
+merge_ld_scripts(ldscript_path)
+generate_nvic_files()
+
+# override ldscript by opencm3
+assert env['LINKFLAGS'][0] == "-T"
+env['LINKFLAGS'][1] = ldscript_path
+
+libs = []
+env.VariantDir(
+    join("$BUILD_DIR", "FrameworkOpenCM3"),
+    join(env.get("PIOHOME_DIR"), "packages", "framework-opencm3")
+)
+libs.append(env.Library(
+    join("$BUILD_DIR", "FrameworkOpenCM3"),
+    get_source_files(root_dir)
+))
+
+Return("env libs")

platformio/builder/scripts/frameworks/spl.py

@@ -0,0 +1,64 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+"""
+    Build script for SPL Framework
+"""
+
+from os.path import join
+
+from SCons.Script import Import, Return
+
+
+env = None
+Import("env")
+
+env.VariantDir(
+    join("$BUILD_DIR", "FrameworkSPLInc"),
+    join("$PIOPACKAGES_DIR", "framework-spl",
+         "${BOARD_OPTIONS['build']['core']}",
+         "variants", "${BOARD_OPTIONS['build']['variant']}", "inc")
+)
+
+env.Append(
+    CPPPATH=[
+        join("$BUILD_DIR", "FrameworkSPLInc"),
+        join("$BUILD_DIR", "FrameworkSPL")
+    ]
+)
+
+envsafe = env.Clone()
+
+envsafe.Append(
+    CPPPATH=[
+        join("$BUILD_DIR", "src")
+    ],
+
+    CPPDEFINES=[
+        "USE_STDPERIPH_DRIVER"
+    ]
+)
+
+#
+# Target: Build SPL Library
+#
+
+extra_flags = env.get("BOARD_OPTIONS", {}).get("build", {}).get("extra_flags")
+ignore_files = []
+if "STM32F40_41xxx" in extra_flags:
+    ignore_files += ["stm32f4xx_fmc.c"]
+elif "STM32F303xC" in extra_flags:
+    ignore_files += ["stm32f30x_hrtim.c"]
+elif "STM32L1XX_MD" in extra_flags:
+    ignore_files += ["stm32l1xx_flash_ramfunc.c"]  # removed warning
+
+libs = []
+libs.append(envsafe.BuildLibrary(
+    join("$BUILD_DIR", "FrameworkSPL"),
+    join("$PIOPACKAGES_DIR", "framework-spl",
+         "${BOARD_OPTIONS['build']['core']}", "variants",
+         "${BOARD_OPTIONS['build']['variant']}", "src"),
+    ignore_files
+))
+
+Return("env libs")

platformio/builder/scripts/stm32.py

@@ -0,0 +1,141 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+"""
+    Builder for STMicroelectronics
+    STM32 Series ARM microcontrollers.
+"""
+
+from os.path import join
+
+from SCons.Script import (COMMAND_LINE_TARGETS, AlwaysBuild, Builder, Default,
+                          DefaultEnvironment)
+
+env = DefaultEnvironment()
+
+env.Replace(
+    AR="arm-none-eabi-ar",
+    AS="arm-none-eabi-gcc",
+    CC="arm-none-eabi-gcc",
+    CXX="arm-none-eabi-g++",
+    OBJCOPY="arm-none-eabi-objcopy",
+    RANLIB="arm-none-eabi-ranlib",
+
+    ARFLAGS=["rcs"],
+
+    ASFLAGS=[
+        "-c",
+        "-g",  # include debugging info (so errors include line numbers)
+        "-x", "assembler-with-cpp",
+        "-Wall",
+        "-mthumb",
+        "-mcpu=${BOARD_OPTIONS['build']['mcu']}"
+    ],
+
+    CCFLAGS=[
+        "-g",   # include debugging info (so errors include line numbers)
+        "-Os",  # optimize for size
+        "-ffunction-sections",  # place each function in its own section
+        "-fdata-sections",
+        "-Wall",
+        "-mthumb",
+        "-mcpu=${BOARD_OPTIONS['build']['mcu']}",
+        "-MMD"  # output dependancy info
+    ],
+
+    CXXFLAGS=[
+        "-fno-rtti",
+        "-fno-exceptions"
+    ],
+
+    UPLOADER=join("$PIOPACKAGES_DIR", "tool-stlink", "st-flash"),
+    UPLOADERFLAGS=[
+        "write",        # write in flash
+        "$SOURCES",     # firmware path to flash
+        "0x08000000"    # flash start adress
+    ],
+
+    UPLOADCMD="$UPLOADER $UPLOADERFLAGS"
+)
+
+
+env.Append(
+    CPPDEFINES=[
+        "F_CPU=$BOARD_F_CPU",
+        "${BOARD_OPTIONS['build']['variant'].upper()}"
+    ]
+)
+
+env.Append(
+    LINKFLAGS=[
+        "-Os",
+        "-nostartfiles",
+        "-nostdlib",
+        "-Wl,--gc-sections",
+        "-mthumb",
+        "-mcpu=${BOARD_OPTIONS['build']['mcu']}"
+    ]
+)
+
+if env.get("BOARD_OPTIONS", {}).get("build", {}).get("mcu")[-2:] == "m4":
+    env.Append(
+        ASFLAGS=[
+            "-mfloat-abi=hard",
+            "-mfpu=fpv4-sp-d16",
+            "-fsingle-precision-constant"
+        ],
+        CCFLAGS=[
+            "-mfloat-abi=hard",
+            "-mfpu=fpv4-sp-d16",
+            "-fsingle-precision-constant"
+        ],
+        LINKFLAGS=[
+            "-mfloat-abi=hard",
+            "-mfpu=fpv4-sp-d16",
+            "-fsingle-precision-constant"
+        ]
+    )
+
+env.Append(
+    BUILDERS=dict(
+        ElfToBin=Builder(
+            action=" ".join([
+                "$OBJCOPY",
+                "-O",
+                "binary",
+                "$SOURCES",
+                "$TARGET"]),
+            suffix=".bin"
+        )
+    )
+)
+
+CORELIBS = env.ProcessGeneral()
+
+#
+# Target: Build executable and linkable firmware
+#
+
+target_elf = env.BuildFirmware(CORELIBS + ["c", "gcc", "m", "nosys"])
+
+#
+# Target: Build the .bin file
+#
+
+if "uploadlazy" in COMMAND_LINE_TARGETS:
+    target_bin = join("$BUILD_DIR", "firmware.bin")
+else:
+    target_bin = env.ElfToBin(join("$BUILD_DIR", "firmware"), target_elf)
+
+#
+# Target: Upload by default .bin file
+#
+
+upload = env.Alias(["upload", "uploadlazy"], target_bin, ("$UPLOADCMD"))
+AlwaysBuild(upload)
+
+#
+# Target: Define targets
+#
+
+Default(target_bin)

platformio/builder/scripts/titiva.py

@@ -59,21 +59,22 @@ env.Replace(
         "F_CPU=$BOARD_F_CPU"
     ],
 
+    UPLOADER=join("$PIOPACKAGES_DIR", "tool-lm4flash", "lm4flash"),
+    UPLOADCMD="$UPLOADER $SOURCES"
+)
+
+env.Append(
     LINKFLAGS=[
         "-Os",
         "-nostartfiles",
         "-nostdlib",
         "-Wl,--gc-sections",
-        "-Wl,--entry=ResetISR",
         "-mthumb",
         "-mcpu=cortex-m4",
         "-mfloat-abi=hard",
         "-mfpu=fpv4-sp-d16",
         "-fsingle-precision-constant"
-    ],
-
-    UPLOADER=join("$PIOPACKAGES_DIR", "tool-lm4flash", "lm4flash"),
-    UPLOADCMD="$UPLOADER $SOURCES"
+    ]
 )
 
 env.Append(

platformio/platforms/stm32.py

@@ -0,0 +1,40 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+from platformio.platforms.base import BasePlatform
+
+
+class Stm32Platform(BasePlatform):
+
+    """
+        An embedded platform for STMicroelectronics ARM microcontrollers
+    """
+
+    PACKAGES = {
+
+        "toolchain-gccarmnoneeabi": {
+            "alias": "toolchain",
+            "default": True
+        },
+
+        "ldscripts": {
+            "default": True
+        },
+
+        "tool-stlink": {
+            "alias": "uploader",
+            "default": True
+        },
+
+        "framework-cmsis": {
+            "default": True
+        },
+
+        "framework-spl": {
+            "default": True
+        },
+
+        "framework-opencm3": {
+            "default": True
+        }
+    }

platformio/platforms/titiva.py

@@ -5,6 +5,7 @@ from platformio.platforms.base import BasePlatform
 
 
 class TitivaPlatform(BasePlatform):
+
     """
         An embedded platform for TI TIVA C ARM microcontrollers
         (with Energia Framework)
@@ -17,6 +18,10 @@ class TitivaPlatform(BasePlatform):
             "default": True
         },
 
+        "ldscripts": {
+            "default": True
+        },
+
         "tool-lm4flash": {
             "alias": "uploader",
             "default": True