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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32


STM32F767ZI nucleo board printf to console

_read() and _write() in autogenerated syscalls.c is are weak functions.

Virtually any possible own implementation will do the thing. E.g. https://electronics.stackexchange.com/questions/206113/how-do-i-use-the-printf-function-on-stm32Question

BTW, the file syscalls.c mostly contains “always failing” mock syscall implementations and may be safely deleted: anyway, you will need to implement own working variant of every one used )

printf() uses _write(), no more.



parts of vanilla “blinky” example modified to printf() blinks:

main.c


...
/* Private includes ----------------------*/
/* USER CODE BEGIN Includes */

  1. include ‹stdio.h›

/* USER CODE END Includes */
...
...
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */
HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
HAL_Delay(500);
printf(“Hello, world!\r\n”);
}
/* USER CODE END 3 */
...
...
/* USER CODE BEGIN 4 */

int _write(int file, char *ptr, int len)
{
if (len > 0)
HAL_UART_Transmit(&huart2, (uint8_t*)ptr, len, len/10+5); // because baudrate is 115200
return len;
}


/* USER CODE END 4 */
...