GD32F3x0_Firmware_Library/Examples/USART/Printf/main.c

/*!
    \file  main.c
    \brief USART printf
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-06-06, V1.0.0, firmware for GD32F3x0
*/

#include "gd32f3x0.h"
#include <stdio.h>
#include "gd32f3x0_eval.h"

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    gd_eval_com_init(EVAL_COM1);
    
    printf("a usart transmit test example!");
    while (1);
}

/* retarget the C library printf function to the USART */
int fputc(int ch, FILE *f)
{
    usart_data_transmit(EVAL_COM1, (uint8_t) ch);
    while(RESET == usart_flag_get(EVAL_COM1, USART_FLAG_TBE));
    return ch;
}