硬體平臺：stm32F407Zet6

軟體平臺：stm32cubeMX 4.7+MDK5.14

電路連線：PA9,PA10

第一步、通過Stm32CubeMX圖形介面建立Keil工程

需要配置的地方是

在這裡可以修改串列埠工作的一下引數，軟體就可以生成配置好的工程，不需要親自去配置這些了。

第二步。開啟工程，編寫程式碼，驗證

/* USER CODE BEGIN PV */
#include "stdio.h"
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
PUTCHAR_PROTOTYPE
{
	HAL_UART_Transmit(&huart1 , (uint8_t *)&ch, 1, 0xFFFF);
	return ch;
}
/* USER CODE END PV */
 

這段程式為了可以使用printf（）函式，對字元輸出函式進行了重定向，這樣我們就可以在程式中使用printf函式進行輸出了，這裡使用的是查詢傳送方式，有超時控制的。接下來來看中斷方式的。

/**
  * @brief  This function handles UART interrupt request.
  * @param  huart: pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @retval None
  */
void HAL_UART_IRQHandler(UART_HandleTypeDef *huart)
{
  uint32_t tmp1 = 0, tmp2 = 0;

  tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_PE);
  tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_PE);  
  /* UART parity error interrupt occurred ------------------------------------*/
  if((tmp1 != RESET) && (tmp2 != RESET))
  { 
    __HAL_UART_CLEAR_PEFLAG(huart);
    
    huart->ErrorCode |= HAL_UART_ERROR_PE;
  }
  
  tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_FE);
  tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_ERR);
  /* UART frame error interrupt occurred -------------------------------------*/
  if((tmp1 != RESET) && (tmp2 != RESET))
  { 
    __HAL_UART_CLEAR_FEFLAG(huart);
    
    huart->ErrorCode |= HAL_UART_ERROR_FE;
  }
  
  tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_NE);
  tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_ERR);
  /* UART noise error interrupt occurred -------------------------------------*/
  if((tmp1 != RESET) && (tmp2 != RESET))
  { 
    __HAL_UART_CLEAR_NEFLAG(huart);
    
    huart->ErrorCode |= HAL_UART_ERROR_NE;
  }
  
  tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_ORE);
  tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_ERR);
  /* UART Over-Run interrupt occurred ----------------------------------------*/
  if((tmp1 != RESET) && (tmp2 != RESET))
  { 
    __HAL_UART_CLEAR_OREFLAG(huart);
    
    huart->ErrorCode |= HAL_UART_ERROR_ORE;
  }
  
  tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_RXNE);
  tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_RXNE);
  /* UART in mode Receiver ---------------------------------------------------*/
  if((tmp1 != RESET) && (tmp2 != RESET))
  { 
    UART_Receive_IT(huart);
  }
  
  tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_TXE);
  tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_TXE);
  /* UART in mode Transmitter ------------------------------------------------*/
  if((tmp1 != RESET) && (tmp2 != RESET))
  {
    UART_Transmit_IT(huart);
  }
  
  tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_TC);
  tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_TC);
  /* UART in mode Transmitter end --------------------------------------------*/
  if((tmp1 != RESET) && (tmp2 != RESET))
  {
    UART_EndTransmit_IT(huart);
  }

  if(huart->ErrorCode != HAL_UART_ERROR_NONE)
  {
    /* Set the UART state ready to be able to start again the process */
    huart->State = HAL_UART_STATE_READY;
    
    HAL_UART_ErrorCallback(huart);
  }  
}
 

這個函式中查詢了所有可能發生的中斷。用到的中斷是傳送完成中斷，就找到了UART_EndTransmit_IT(huart);再跳進去看看，

/**
  * @brief  Wraps up transmission in non blocking mode.
  * @param  huart: pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @retval HAL status
  */
static HAL_StatusTypeDef UART_EndTransmit_IT(UART_HandleTypeDef *huart)
{
  /* Disable the UART Transmit Complete Interrupt */    
  __HAL_UART_DISABLE_IT(huart, UART_IT_TC);
  
  /* Check if a receive process is ongoing or not */
  if(huart->State == HAL_UART_STATE_BUSY_TX_RX) 
  {
    huart->State = HAL_UART_STATE_BUSY_RX;
  }
  else
  {
    /* Disable the UART Parity Error Interrupt */
    __HAL_UART_DISABLE_IT(huart, UART_IT_PE);

    /* Disable the UART Error Interrupt: (Frame error, noise error, overrun error) */
    __HAL_UART_DISABLE_IT(huart, UART_IT_ERR);

    huart->State = HAL_UART_STATE_READY;
  }
  
  HAL_UART_TxCpltCallback(huart);
  
  return HAL_OK;
}
 

這個函式在確定中斷髮生了之後呼叫了，HAL_UART_TxCpltCallback(huart);從函式名上可以看出，這是個回撥函式，就是留給上層來實現的函式，由這個函式的實現不同，來實現不同的功能。這裡來實現這個函式，讓它在中斷髮生的時候吧USART1Ready置為SET；程式碼修改如下

/* USER CODE BEGIN PV */
#include "stdio.h"
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
__IO ITStatus USART1Ready = RESET;

PUTCHAR_PROTOTYPE
{
	HAL_UART_Transmit_IT(&huart1 , (uint8_t *)&ch, 1);
	while (USART1Ready != SET)
  {
  }
	USART1Ready = RESET;
	return ch;
}


/* USER CODE END PV */

這是重定向函式的修改，啟動傳送之後，等待發送完成。重新實現的回撥函式如下圖所示：

/**
  * @brief  Tx Transfer completed callbacks.
  * @param  huart: pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @retval None
  */
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
  /* NOTE: This function Should not be modified, when the callback is needed,
           the HAL_UART_TxCpltCallback could be implemented in the user file
   */ 
	USART1Ready = SET;
}

這樣就可以了，下載驗證。