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System Workbench for STM32


Strange Error While Compiling

Tunisia

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)