cubemx的makefile方式的printf重定向到串口

utils.h

/***
 * @Date: 2024-08-25 15:32:23
 * @LastEditors: Please set LastEditors
 * @LastEditTime: 2024-08-25 16:23:59
 * @FilePath: \cameraLcd\Core\Inc\utils.h
 */
#ifndef __UTILS_H
#define __UTILS_H

int _write(int fd, char *ch, int len);

#endif /* __UTILS_H */

utils.c

#include "utils.h"
#include <stdio.h>
#include "usart.h"

int _write(int fd, char *ch, int len)
{
  HAL_UART_Transmit(&huart1, (uint8_t*)ch, len, 0xFFFF);
  return len;
}

main.c

#include "main.h"
...
#include "utils.h"
#include <stdio.h>

...

int main()
{
    ...

    while(1)
    {
        printf("hello world\r\n");
    }
    ...
}

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来源：CSDN 原文，首次发布于 2024-08-25。