STM32CubeIDE printf 多个串口

自定义USART_printf如下

#include <stdarg.h>
#include <stdio.h>
#include <string.h>

void USART_printf (UART_HandleTypeDef *huart,char *fmt, ...){
    static char buffer[256];
    va_list args;
    va_start(args,fmt);
    vsprintf(buffer,fmt,args);
    va_end(args);
    HAL_UART_Transmit(huart,(uint8_t*)buffer,strlen(buffer),0xFFFFFFFFU);
}

使用方法如下：

  USART_printf(&huart1,"%s is %d years old\r\n","Li Ming",15);//在串口1中打印信息
  USART_printf(&huart2,"%s is %d years old\r\n","Wang Fei",16);//在串口2中打印信息

不同的串口同时打印信息结果如下

 

第二种重定向printf

int __io_putchar(int ch)
{
    HAL_UART_Transmit(&huart1, (uint8_t*)&ch, 1, 1000);
    return ch;
}