串口DMA数据收发实验求助，发不出去，也收不到数据

白饭粒 · 发表于 2019-9-19 16:04:53

自己用cube生成了一个串口DMA收发的工程，但是发不出去，也收不到，找了半天实在没找到错误，有木有大神救救我，谢，代码如下：
uart1初始化部分

void MX_USART1_UART_Init(void)
{
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 921600;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
Error_Handler();
  }
}

函数HAL_UART_Init(&huart1)展开内部HAL_UART_MspInit()部分

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(uartHandle->Instance==USART1)
  {
  /* USER CODE BEGIN USART1_MspInit 0 */

  /* USER CODE END USART1_MspInit 0 */
/* USART1 clock enable */
__HAL_RCC_USART1_CLK_ENABLE();

__HAL_RCC_GPIOA_CLK_ENABLE();
/**USART1 GPIO Configuration
PA9 ------> USART1_TX
PA10    ------> USART1_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* USART1 DMA Init */
/* USART1_RX Init */
hdma_usart1_rx.Instance = DMA2_Channel7;
hdma_usart1_rx.Init.Request = DMA_REQUEST_2;
hdma_usart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart1_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart1_rx.Init.Mode = DMA_NORMAL;
hdma_usart1_rx.Init.Priority = DMA_PRIORITY_HIGH;
if (HAL_DMA_Init(&hdma_usart1_rx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmarx,hdma_usart1_rx);

/* USART1_TX Init */
hdma_usart1_tx.Instance = DMA2_Channel6;
hdma_usart1_tx.Init.Request = DMA_REQUEST_2;
hdma_usart1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_usart1_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart1_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart1_tx.Init.Mode = DMA_NORMAL;
hdma_usart1_tx.Init.Priority = DMA_PRIORITY_HIGH;
if (HAL_DMA_Init(&hdma_usart1_tx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmatx,hdma_usart1_tx);

/* USART1 interrupt Init */
HAL_NVIC_SetPriority(USART1_IRQn, 6, 0);
HAL_NVIC_EnableIRQ(USART1_IRQn);
  /* USER CODE BEGIN USART1_MspInit 1 */
__HAL_UART_ENABLE_IT(uartHandle,UART_IT_IDLE); /* 开启串口空闲中断 */
  /* USER CODE END USART1_MspInit 1 */
  }

然后利用 HAL_UART_Transmit_DMA(&huart1, pucBuf, usLen);进行数据发送，
               HAL_UART_Receive_DMA(&huart1,DMARecvBuf,BUFFER_SIZE);进行数据接收

中断部分：

void DMA2_Channel6_IRQHandler(void)
{
  HAL_DMA_IRQHandler(&hdma_usart1_tx);
}

void DMA2_Channel7_IRQHandler(void)
{
  HAL_DMA_IRQHandler(&hdma_usart1_rx);
}

void USART1_IRQHandler(void)
{
  HAL_UART_IRQHandler(&huart1);
  if(__HAL_UART_GET_FLAG(&huart1, UART_FLAG_IDLE) != RESET)
  {
UART_IDLE_CallBack(&huart1);
  }
}

接收到空闲中断后，调用了UART_IDLE_CallBack();
void UART_IDLE_CallBack(UART_HandleTypeDef *huart)
{
if(huart == &huart1)
{
   HAL_UART_AbortReceive(&huart1);
   HAL_UART_Receive_DMA(&huart1,DMARecvBuf,BUFFER_SIZE);

      __HAL_UART_CLEAR_IDLEFLAG(huart);
}
}

整个逻辑就是这样，DMA通道应该没错，因为是CUBE生成的，就是不知道为什么发不出去，也收不到，小伙伴们能看看么