STM32F407串口使用心得补充

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那个叫黑的人|

楼主 | 2018-7-29 19:26 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

stm32f407, 串口, UART, TE, ui

以下也是对库函数的改动
static HAL_StatusTypeDef UART_Receive_IT(UART_HandleTypeDef *huart)
{
  uint16_t* tmp;
  uint32_t tmp1 = 0;

  tmp1 = huart->State;
  if((tmp1 == HAL_UART_STATE_BUSY_RX) || (tmp1 == HAL_UART_STATE_BUSY_TX_RX))
  {
if(huart->Init.WordLength == UART_WORDLENGTH_9B)
{
   tmp = (uint16_t*) huart->pRxBuffPtr;
   if(huart->Init.Parity == UART_PARITY_NONE)
   {
      *tmp = (uint16_t)(huart->Instance->DR & (uint16_t)0x01FF);
      huart->pRxBuffPtr += 2;
   }
   else
   {
      *tmp = (uint16_t)(huart->Instance->DR & (uint16_t)0x00FF);
      huart->pRxBuffPtr += 1;
   }
}
else
{
   if(huart->Init.Parity == UART_PARITY_NONE)
   {
      *huart->pRxBuffPtr++ = (uint8_t)(huart->Instance->DR & (uint8_t)0x00FF);
   }
   else
   {
      *huart->pRxBuffPtr++ = (uint8_t)(huart->Instance->DR & (uint8_t)0x007F);
   }
}

if(--huart->RxXferCount == 0)
{
//    __HAL_UART_DISABLE_IT(huart, UART_IT_RXNE);

//    /* Check if a transmit process is ongoing or not */
//    if(huart->State == HAL_UART_STATE_BUSY_TX_RX)
//    {
//       huart->State = HAL_UART_STATE_BUSY_TX;
//    }
//    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_RxCpltCallback(huart);
            /*以上注释掉的为原库代码，以下两行为用户添加的代码，
               * 修改后，接受缓存为环形缓存。
         */
      huart->RxXferCount = huart->RxXferSize;//用户修改，非原库代码
      huart->pRxBuffPtr -= huart->RxXferSize;//用户修改，非原库代码

   return HAL_OK;
}
return HAL_OK;
  }
  else
  {
return HAL_BUSY;
  }
}

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