HAL串口实战例程，调试通过！

[复制链接]

wjandsq 发布时间：2019-5-10 21:33

技术帖
文章封面:	-
文章简介:	-

stm32f4xx_hal_uart.c 中的HAL_UART_IRQHandler 函数，增加如下代码

  /* UART Idle interrupt occurred --------------------------------------------*/
  if (((isrflags & USART_SR_IDLE) != RESET) && ((cr1its & USART_CR1_IDLEIE) != RESET))
  {
__HAL_UART_CLEAR_IDLEFLAG(huart);
__HAL_UART_DISABLE_IT(huart, UART_IT_IDLE);
HAL_UART_RxIdleCallback(huart);
return;
  }

以下__weak 函数也在stm32f4xx_hal_uart.c 中定义
/**
  * @brief  Rx Idle callbacks.
  * @param  huart: Pointer to a UART_HandleTypeDef structure that contains
  *             the configuration information for the specified UART module.
  * @retval None
  */
__weak void HAL_UART_RxIdleCallback(UART_HandleTypeDef *huart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(huart);
  /* NOTE: This function should not be modified, when the callback is needed,
         the HAL_UART_RxIdleCallback can be implemented in the user file
*/
}
同时，stm32f4xx_hal_uart.h中增加如下函数声明，算是给最新的HAL库打补丁了。
void HAL_UART_RxIdleCallback(UART_HandleTypeDef *huart);

最后，在生成的代码中，增加如下实际函数。
/* USER CODE BEGIN 1 */
/**
  * @brief  Rx 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_RxCpltCallback(UART_HandleTypeDef *huart)
{
  if (huart->Instance == USART1) {
USART1_Rx_Buf[USART1_Rx_Count] = USART1_Rx_temp;
HAL_UART_Receive_IT(huart, (uint8_t *)&USART1_Rx_temp, 1);
if (++USART1_Rx_Count >= USART1_Rx_Buf_Size) {
   USART1_Rx_Count = 0;
}
__HAL_UART_CLEAR_IDLEFLAG(&huart1);
__HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE);
  }
}

/**
  * @brief  Rx Idle callbacks.
  * @param  huart: Pointer to a UART_HandleTypeDef structure that contains
  *             the configuration information for the specified UART module.
  * @retval None
  */
void HAL_UART_RxIdleCallback(UART_HandleTypeDef *huart)
{
  if (huart->Instance == USART1) {
__HAL_UART_CLEAR_IDLEFLAG(huart);
__HAL_UART_ENABLE_IT(huart, UART_IT_IDLE);
if(USART1_Rx_Buf[1] == 0x55){
   __NOP();
   __NOP();
   __NOP();
} else if(USART1_Rx_Buf[1] == 0xA5){
   __NOP();
   __NOP();
   __NOP();
}
memset((uint8_t *)USART1_Rx_Buf, 0, 1024);
USART1_Rx_Count = 0;
  }
}

/* USER CODE END 1 */

经测试，不管连发多少个字符，都会进空闲中断回调函数，这样应用程序就非常好处理了。

2019/05/10 wjandsq@163.com