单个串口重定向

#include "stdio.h"

//-----printf重定向-----
int fputc(int ch,FILE *f)
{
    HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,0xFFFF);
    while(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_TC)!=SET);//等待发送完成
    
    return ch;

}

 printf("Mpu6050 Project Start\r\n");
  printf(" %s\r\n",p);
 

一定要勾选MicroLib

多个串口重定向

 #include "stdio.h"
 #include "stdarg.h"
 #include "string.h "
 
 void print(UART_HandleTypeDef* huart, const char* buf, ...)
{
  const char *p = buf;
  char str[255] = {0};
  va_list v;
  va_start(v, buf);
  vsprintf(str, buf, v); //使用可变参数的字符串打印。类似sprintf
  HAL_UART_Transmit(huart, str, strlen(str), 0xff);
  va_end(v);
}

串口中断

uint8_t Usart1_RX_Buf;  //串口接收数据缓存buf
uint8_t Usart2_RX_Buf; 
uint8_t Usart3_RX_Buf; 

HAL_UART_Receive_IT(&huart1,&Usart1_RX_Buf,1);    
HAL_UART_Receive_IT(&huart2,&Usart2_RX_Buf,1);    
HAL_UART_Receive_IT(&huart3,&Usart3_RX_Buf,1);



void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if(huart->Instance == USART1)
    {
 
        HAL_UART_Transmit(&huart1,&Uart1RX_Data,1,0xFFFF);
        HAL_UART_Receive_IT(&huart1,&Uart1RX_Data,1);      
    }
    
    if(huart->Instance == USART2)
    {
 
        HAL_UART_Transmit(&huart2,&Uart2RX_Data,1,0xFFFF);
        HAL_UART_Receive_IT(&huart2,&Uart2RX_Data,1);
    }
    
    if(huart->Instance == USART3)
    {
        HAL_UART_Transmit(&huart3,&Uart3RX_Data,1,0xFFFF);
        HAL_UART_Receive_IT(&huart3,&Uart3RX_Data,1);      
    }
    
}