Posted by rreignier on 2016-08-27 16:22

Hello,

Thank you for the usefull infos.
By copying the syscalls.c file into my project and adding the flollowing function at the end of my main.c, I managed to get some output on a serial monitor by calling print().

int __io_putchar(int ch) {
  HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, 0xFFFF);
  return ch;
}

But in a project converted to C++, doing the exact same modifications does not work. The function _ _ io_putchar() is never called.

Does anyone know what could cause that?

Thanks.