STM32L0串口收发的知识点汇总，不看肯定后悔

1.串口1 USART1初始化 [注意使能接收中断]
/**
  * @brief USART1 Initialization Function
  * @param None
  * @retval None
  */
UART_HandleTypeDef huart1;
void MX_USART1_UART_Init(void)
{
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  //使能接收中断
  HAL_UART_Receive_IT(&huart1,usart1_RxBuf_temp,1);          // Enable the USART1 Interrupt
}
2.串口接收中断
/**
  * @brief This function handles USART1 global interrupt / USART1 wake-up interrupt through EXTI line 25.
  */
void USART1_IRQHandler(void)
{
  HAL_UART_IRQHandler(&huart1);
}


3.串口接收中断完成回调函数
/**
  * @brief  Rx Transfer completed callback
  * @param  UartHandle: UART handle
  * @note   This example shows a simple way to report end of IT Rx transfer, and
  *         you can add your own implementation.
  * @retval None
  */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
    if(UartHandle->Instance == USART1)
    {
        Netctrlp_Receive(usart1_RxBuf_temp[0]);
        HAL_UART_Receive_IT(&huart1,usart1_RxBuf_temp,1);      // 重新使能串口1接收中断
    }
}


4.重定向输入输出，将输出重定向至printf
uint8_t ch;
uint8_t ch_r;
//重写这个函数,重定向printf函数到串口，意思就是说printf直接输出到串口，其默认输出到控制台的
/*fputc*/
int fputc(int c, FILE * f)
{
    ch=c;
//    HAL_UART_Transmit_IT(&huart1,&ch,1);//发送串口
    HAL_UART_Transmit(&huart1,&ch,1,100);//发送串口
    return ch;
}


//重定向scanf函数到串口 意思就是说接受串口发过来的数据，其默认是接受控制台的数据
/*fgetc*/
int fgetc(FILE * F)   
{
    HAL_UART_Receive_IT(&huart1,&ch_r,1);//接收
    return ch_r;
}


5.main.c 主函数
int main(void) //SLAVE
{
    HAL_Init();
    /* Configure the system clock */
    SystemClock_Config();
    MX_USART1_UART_Init();
   
        while(1){
      DBG_print(DBG_DEBUG, " A.");
      HAL_Delay(100);
    }
}