昨天看HAL库的串口收发函数，DMA方式，发现函数里竟然有收发同步的操作，但不太确定，莫非HAL的串口DMA方式下不能实现独立的全双工通信么？

贴个代码看看

关注！没用过

/**
  * @brief  Receives an amount of data in non blocking mode.
  * @param  huart: pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @param  pData: Pointer to data buffer
  * @param  Size: Amount of data to be received
  * @note   When the UART parity is enabled (PCE = 1) the data received contain the parity bit.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
{
  uint32_t *tmp;
  uint32_t tmp1 = 0;
  
  tmp1 = huart->State;   
  if((tmp1 == HAL_UART_STATE_READY) || (tmp1 == HAL_UART_STATE_BUSY_TX))
  {
    if((pData == NULL ) || (Size == 0))
    {
      return HAL_ERROR;
    }
   
    /* Process Locked */
    __HAL_LOCK(huart);
   
    huart->pRxBuffPtr = pData;
    huart->RxXferSize = Size;
   
    huart->ErrorCode = HAL_UART_ERROR_NONE;
    /* Check if a transmit process is ongoing or not */
    if(huart->State == HAL_UART_STATE_BUSY_TX)
    {
      huart->State = HAL_UART_STATE_BUSY_TX_RX;
    }
    else
    {
      huart->State = HAL_UART_STATE_BUSY_RX;
    }
   
    /* Set the UART DMA transfer complete callback */
    huart->hdmarx->XferCpltCallback = UART_DMAReceiveCplt;
   
    /* Set the UART DMA Half transfer complete callback */
    huart->hdmarx->XferHalfCpltCallback = UART_DMARxHalfCplt;
   
    /* Set the DMA error callback */
    huart->hdmarx->XferErrorCallback = UART_DMAError;

    /* Enable the DMA Stream */
    tmp = (uint32_t*)&pData;
    HAL_DMA_Start_IT(huart->hdmarx, (uint32_t)&huart->Instance->DR, *(uint32_t*)tmp, Size);
   
    /* Enable the DMA transfer for the receiver request by setting the DMAR bit
    in the UART CR3 register */
    huart->Instance->CR3 |= USART_CR3_DMAR;
   
    /* Process Unlocked */
    __HAL_UNLOCK(huart);
   
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

/**
  * @brief  Sends an amount of data in non blocking mode.
  * @param  huart: pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @param  pData: Pointer to data buffer
  * @param  Size: Amount of data to be sent
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
{
  uint32_t *tmp;
  uint32_t tmp1 = 0;
  
  tmp1 = huart->State;  
  if((tmp1 == HAL_UART_STATE_READY) || (tmp1 == HAL_UART_STATE_BUSY_RX))
  {
    if((pData == NULL ) || (Size == 0))
    {
      return HAL_ERROR;
    }
   
    /* Process Locked */
    __HAL_LOCK(huart);
   
    huart->pTxBuffPtr = pData;
    huart->TxXferSize = Size;
    huart->TxXferCount = Size;
   
    huart->ErrorCode = HAL_UART_ERROR_NONE;
    /* Check if a receive process is ongoing or not */
    if(huart->State == HAL_UART_STATE_BUSY_RX)
    {
      huart->State = HAL_UART_STATE_BUSY_TX_RX;
    }
    else
    {
      huart->State = HAL_UART_STATE_BUSY_TX;
    }
   
    /* Set the UART DMA transfer complete callback */
    huart->hdmatx->XferCpltCallback = UART_DMATransmitCplt;
   
    /* Set the UART DMA Half transfer complete callback */
    huart->hdmatx->XferHalfCpltCallback = UART_DMATxHalfCplt;
   
    /* Set the DMA error callback */
    huart->hdmatx->XferErrorCallback = UART_DMAError;

    /* Enable the UART transmit DMA Stream */
    tmp = (uint32_t*)&pData;
    HAL_DMA_Start_IT(huart->hdmatx, *(uint32_t*)tmp, (uint32_t)&huart->Instance->DR, Size);
   
    /* Enable the DMA transfer for transmit request by setting the DMAT bit
       in the UART CR3 register */
    huart->Instance->CR3 |= USART_CR3_DMAT;
   
    /* Process Unlocked */
    __HAL_UNLOCK(huart);
   
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;   
  }
}

cxtarm 发表于 2015-1-30 15:25
贴个代码看看

已经附上代码了，需要源文件不？

a208hlc-57526 发表于 2015-1-30 21:13
已经附上代码了，需要源文件不？

根据你贴的代码，应该是全双工的。

学习中……感谢分享！