A demo project of FreeRTOS running on a STM32F4 Discovery board.
Steps to run this example
- A PC running Linux or Windows with Cygwin(not tested). A Mac is also fine with this example.
- A STM32F4Discovery board.
- A FT232RL USB to serial board which is recommended if there's no serial port on your computer.
- USB Cable, Dupont Line and other tools.
Install the toolchain
The pre-built version of GNU Tools for ARM can be downloaded from its website. It's available for most systems. Follow the instructions in the readme file and installed the toolchain to your system. To verify your installation, simply type
arm-none-eabi-gcc --version in your terminal, if everything goes right, you'll get output like this:
arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 4.7.3 20130312 (release) [ARM/embedded-4_7-branch revision 196615] Copyright (C) 2012 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Install ST-Link utility
Grab the official utility from ST website. Note that you should install the USB driver before install the st-util.
Linux and OS X
Clone this git, follow the instructions on that page and install st-util to your system.
Compile this example
The only thing you need to do is to edit the makefile and let it know your toolchain installation path. Change the
TOOLCHARN_ROOT variable at the third line of makefile and point it to where you installed the toolchain. The you can simply type
make and compile the example.
Connect your STM32F4Discovery with a USB cable. You can flash the binary into the board with this:
$ st-flash write binary/FreeRTOS.bin 0x8000000
The code is wrote directly into internal flash of STM32 processor and it starts to run after reset. To debug it, first start the GDB server:
$ st-util &
And then GDB:
$ arm-none-eabi-gdb binary/FreeRTOS.elf (gdb) tar ext :4242 (gdb) b main (gdb) c
You'll get breakpoint triggered at
main function, and enjoy!