a208hlc-57526 发表于 2015-1-30 14:27:16

HAL库的DMA串口发送接收问题

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？

cxtarm 发表于 2015-1-30 15:25:30

贴个代码看看

大秦正声 发表于 2015-1-30 15:32:34

关注！没用过

a208hlc-57526 发表于 2015-1-30 21:12:47

/**
* @briefReceives an amount of data in non blocking mode.
* @paramhuart: pointer to a UART_HandleTypeDef structure that contains
*                the configuration information for the specified UART module.
* @parampData: Pointer to data buffer
* @paramSize: 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;
}
}

a208hlc-57526 发表于 2015-1-30 21:13:15

/**
* @briefSends an amount of data in non blocking mode.
* @paramhuart: pointer to a UART_HandleTypeDef structure that contains
*                the configuration information for the specified UART module.
* @parampData: Pointer to data buffer
* @paramSize: 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;   
}
}

a208hlc-57526 发表于 2015-1-30 21:13:54

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？

cxtarm 发表于 2015-1-31 11:59:24

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。

HenryChen 发表于 2015-7-2 09:58:11

学习中……感谢分享！
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