PY32F030_Air_Template/src/main.c

#include <stdio.h>

/* App */
#include "app_syscalls.h"
#include "main.h"

UART_HandleTypeDef huart1;

int main(void) {
    HAL_Init();

    app_syscalls_init();

    printf("Hello world.\r\n");

    for (;;) {
        /* -- */
    }
}