GD32fRGT6单片机如何printf

小熊在忙fpga2025-12-07 9:24

复制代码

int fputc(int ch, FILE *f) {
    usart_data_transmit(EVAL_COM0,ch);//EVAL_COM0即为usrat0
    while(usart_flag_get(EVAL_COM0, USART_FLAG_TBE) == RESET);
    return ch;
}

在IAR8版本中用此fputc代码即可，而如果是IAR9就要用_write代码。此代码放在main外便可以，不过还需要在main函数内写usart初始化函数gd_eval_com_init（），该函数在eval.h文件里有；

EVAL_COM0是usart0，这个在eval.h文件里有写，该文件是各种硬件接口定义文件。

复制代码

#include "gd32f4xx.h"
#include "main.h"
#include "system_config.h"
#include "laser_distance.h"
#include "gd32f450i_eval.h"//提供所有外设接口，比如usrat0
#include <stdio.h>



int main(void)
{
  uint32_t AHB = rcu_clock_freq_get(CK_AHB);
  uint32_t APB2 = rcu_clock_freq_get(CK_APB2);
  uint32_t APB1 = rcu_clock_freq_get(CK_APB1);
  
    System_Init();
    LED_Init();
    gd_eval_com_init(EVAL_COM0);
    
    printf("GD32F405 Laser Distance Measurement\r\n");
    printf("Timer Frequency: %.1f MHz\r\n", TIMER_FREQUENCY / 1000000.0f);
    printf("Fiber Index: %.3f\r\n", FIBER_INDEX);
    printf("Ready for measurement...\r\n\r\n");
    
    while (1)
    {
        Start_Measurement();
        
        uint32_t timeout = 0;
        while (measure_state == MEASURE_WAITING_FOR_LASER || 
               measure_state == MEASURE_WAITING_FOR_ECHO)
        {
            timeout++;
            if (timeout > MEASUREMENT_TIMEOUT)
            {
                measure_state = MEASURE_TIMEOUT;
                break;
            }
        }
        
        if (measure_state == MEASURE_COMPLETED)
        {
            float dist = Get_Distance();
            Print_Distance(dist);
        }
//        else
//        {
//            printf("Measurement timeout!\r\n");
//        }
//        
//        for (volatile uint32_t i = 0; i < 1000000; i++);
    }
}

// 重定向printf到串口
int fputc(int ch, FILE *f) {
    usart_data_transmit(EVAL_COM0,ch);//EVAL_COM0即为usrat0
    while(usart_flag_get(EVAL_COM0, USART_FLAG_TBE) == RESET);
    return ch;
}