哪位大神用过9位的DMA接收中断啊？发我个例程看看，感谢~~~

只看该作者 · 2017-7-31 17:56

void MX_USART2_UART_Init(void)
{

  huart2.Instance = USART2;
  huart2.Init.BaudRate = 19200;
  huart2.Init.WordLength = UART_WORDLENGTH_9B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
Error_Handler();
  }
  HAL_NVIC_SetPriority(USART2_IRQn, 1, 3);
  HAL_NVIC_EnableIRQ(USART2_IRQn);

HAL_NVIC_SetPriority(DMA1_Channel4_5_IRQn, 1, 2);
  HAL_NVIC_EnableIRQ(DMA1_Channel4_5_IRQn);
}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct;
if(uartHandle->Instance==USART2)
  {
  /* USER CODE BEGIN USART2_MspInit 0 */

  /* USER CODE END USART2_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_USART2_CLK_ENABLE();

/**USART2 GPIO Configuration
PA2    ------> USART2_TX
PA3    ------> USART2_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF1_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN USART2_MspInit 1 */
hdma_usart2_rx.Instance = DMA1_Channel5;
hdma_usart2_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart2_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart2_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart2_rx.Init.PeriphDataAlignment =DMA_PDATAALIGN_BYTE;
hdma_usart2_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart2_rx.Init.Mode = DMA_NORMAL;
hdma_usart2_rx.Init.Priority = DMA_PRIORITY_LOW;

if (HAL_DMA_Init(&hdma_usart2_rx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmarx,hdma_usart2_rx);

  /* USER CODE END USART2_MspInit 1 */
  }
}

设置成8位接收没问题，设置成9位的时候接收数据就乱了。

只看该作者 · 2017-7-31 17:59

DMA配置成16bit

只看该作者 · 2017-8-1 07:46

feelhyq 发表于 2017-7-31 17:59
DMA配置成16bit

配置成16bit 也不行

HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
{
  /* Check that a Rx process is not already ongoing */
  if(huart->RxState == HAL_UART_STATE_READY)
  {
if((pData == NULL ) || (Size == 0U))
{
   return HAL_ERROR;
}

/* In case of 9bits/No Parity transfer, pData buffer provided as input paramter
   should be aligned on a u16 frontier, as data copy from RDR will be
   handled by DMA from a u16 frontier. */
if ((huart->Init.WordLength == UART_WORDLENGTH_9B) && (huart->Init.Parity == UART_PARITY_NONE))
{
   if((((uint32_t)pData)&1U) != 0U)
   {
      return  HAL_ERROR;
   }
}

/* Process Locked */
__HAL_LOCK(huart);

huart->pRxBuffPtr = pData;
huart->RxXferSize = Size;

huart->ErrorCode = HAL_UART_ERROR_NONE;
huart->RxState = 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;

/* Set the DMA abort callback */
huart->hdmarx->XferAbortCallback = NULL;
/* Enable the DMA channel */
HAL_DMA_Start_IT(huart->hdmarx, (uint32_t)&huart->Instance->RDR, (uint32_t)huart->pRxBuffPtr, Size);

/* Process Unlocked */
__HAL_UNLOCK(huart);

/* Enable the UART Parity Error Interrupt */
SET_BIT(huart->Instance->CR1, USART_CR1_PEIE);

/* Enable the UART Error Interrupt: (Frame error, noise error, overrun error) */
SET_BIT(huart->Instance->CR3, USART_CR3_EIE);

/* Enable the DMA transfer for the receiver request by setting the DMAR bit
   in the UART CR3 register */
SET_BIT(huart->Instance->CR3, USART_CR3_DMAR);

return HAL_OK;
  }
  else
  {
return HAL_BUSY;
  }
}

断点停在  HAL_DMA_Start_IT(huart->hdmarx, (uint32_t)&huart->Instance->RDR, (uint32_t)huart->pRxBuffPtr, Size);这里，调试的时候接收都没问题，断点去掉运行的话，接收的数据就乱了

只看该作者 · 2017-8-1 09:01

本帖最后由 feelhyq 于 2017-8-1 09:07 编辑

...

只看该作者 · 2017-8-1 09:10

hp_nancy 发表于 2017-8-1 07:46
配置成16bit 也不行

HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pDa ...

楼主是不是第一次用HAL库函数？中断里面要有HAL库的中断服务函数，DMA中断也是一样，这些函数里面回将HAL库里面的一些状态给清掉，为了第二次使用。另外，建议调查下你说的 ”断点停在 HAL_DMA_Start_IT(huart->hdmarx, (uint32_t)&huart->Instance->RDR, (uint32_t)huart->pRxBuffPtr, Size);这里，调试的时候接收都没问题，断点去掉运行的话，接收的数据就乱了“原因

只看该作者 · 2017-8-1 10:08

feelhyq 发表于 2017-8-1 09:10
楼主是不是第一次用HAL库函数？中断里面要有HAL库的中断服务函数，DMA中断也是一样，这些函数里面回将HAL ...

是第一次用关键我的程序数据位是8位的时候没有问题

设置成9位的时候数据就不对了

只看该作者 · 2017-8-1 10:14

hp_nancy 发表于 2017-8-1 10:08
是第一次用关键我的程序数据位是8位的时候没有问题

很明显DMA起作用了嘛，数据都收到了，你看看串口助手的设置，数据位是8位，你不是要传输9位吗？ASCI码表应该没有9位码吧(我不是很确定，应该没有)，你需要要想另外一种方法将9位数据显示出来，而不使用串口助手

哪位大神用过9位的DMA接收中断啊？发我个例程看看，感谢~~~

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