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makefilearmembedded-linuxstm32rtos

What are the steps to setup an RTOS application on STM32 using Linux and Makefiles instead of using Windows based IDEs?

I am using STM32F4 Discovery board to develop a simple application to on-board accelerometer while simultaneously lighting respective LEDs mounted around the accelerometer device. I want to use any RTOS but I am unable to decide which one since I am new to using RTOS.

If anyone could elaborate the steps to start this project by using Linux and some Makefiles, that would be appreciated.

Solution

  • Here are the steps to start your project using Linux and Makefiles:

    Step 1: Get a toolchain

    On Ubuntu:

    apt-get install gcc-arm-none-eabi

    Or on launchpad:

    wget https://launchpad.net/gcc-arm-embedded/4.9/4.9-2015-q1-update/+download/gcc-arm-none-eabi-4_9-2015q1-20150306-linux.tar.bz2
tar xjf gcc-arm-none-eabi-4_9-2015q1-20150306-linux.tar.bz2

    Step 2: Get the needed sources

    Step 2.1: The standard library

    You can choose the STM32F4 DSP and standard peripherals library

    Or, you can also use another library like libopencm3.

    Step 2.2: The RTOS

    The most common is to use FreeRTOS.

    Step 3: Create the Makefile

    Just do something like that:

    CROSS_COMPILE=arm-none-eabi-

SRC := myapp.c
SRC += <the needed library files>
SRC += <the needed freertos files>

myapp.elf: myapp.bin
        $(CROSS_COMPILE)objcopy -Obinary $@ $<

myapp.bin: $(SRC:%.c=%.o)
        $(CROSS_COMPILE)gcc -mthumb -nostartfiles -Wl,--gc-sections $^ -o $@

%.o: %.c
        $(CROSS_COMPILE)gcc -mthumb -ffunction-sections -fdata-sections -fno-common -Os -c $< -o $@

    You should add some -I or -L to fix the include issue.

    The needed FreeRTOS files are: list.c, queue.c, tasks.c, portable/MemMang/heap_4.c, portable/GCC/ARM_CM4F/port.c

    There is a example project in the Demo/CORTEX_M4F_STM32F407ZG-SK which can help you.

    Step 4: Build

    Add your toolchain directory in the path and run your Makefile:

    export PATH="$PATH:/path/to/toochain/bin"
make

    Step 5: Flash

    You have to use the DFU mode of the STM32F4.

    Install the tool on Ubuntu with apt-get install dfu-util then you can flash your elf file by using:

    sudo dfu-util -a 0 -s 0x08000000 -D myapp.elf