System Workbench for STM32

Posted by tarek bouchkati on 2016-05-30 16:47

Strange ! the double underscore are not mandatory.
You can check UART_printf example (CubeF4\Projects\STM32F401RE-Nucleo\Examples\UART\UART_Printf\SW4STM32\syscalls.c).

Note: If you are not using FreeRTOS, you do not need the stack_ptr (comment #define FreeRTOS)