请教F429串口DMA收发，接收正常，只能发一次

jindizhiwa · 发表于 2022-3-3 10:11:44

使用cubemx配置工程，使能UART2和USART6DMA发送和接收，开启空闲中断，
DMA接收正常，阻塞发送正常，可以实现串口数据的回显。
但是使用中断发送和DMA发送时只能发一帧数据，第二帧发不出来。检测发现STM32不停地进入中断，好像有状态标志位没清。此时可以正常接收数据。比较了阻塞发送、中断发送和DMA发送的寄存器值，又没发现状态标志有变化。
32的各寄存器数据如下图

状态寄存器标志

cube生成的配置：
/* USART2 init function */

void MX_USART2_UART_Init(void)
{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  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;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE BEGIN USART2_Init 2 */
  __HAL_UART_ENABLE_IT(&huart2, UART_IT_IDLE);
HAL_UART_Receive_DMA(&huart2, u2_RxBuf, bufsize);
  /* USER CODE END USART2_Init 2 */

}
/* USART6 init function */

void MX_USART6_UART_Init(void)
{

  /* USER CODE BEGIN USART6_Init 0 */

  /* USER CODE END USART6_Init 0 */

  /* USER CODE BEGIN USART6_Init 1 */

  /* USER CODE END USART6_Init 1 */
  huart6.Instance = USART6;
  huart6.Init.BaudRate = 115200;
  huart6.Init.WordLength = UART_WORDLENGTH_8B;
  huart6.Init.StopBits = UART_STOPBITS_1;
  huart6.Init.Parity = UART_PARITY_NONE;
  huart6.Init.Mode = UART_MODE_TX_RX;
  huart6.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart6.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart6) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE BEGIN USART6_Init 2 */
  __HAL_UART_ENABLE_IT(&huart6, UART_IT_IDLE);
HAL_UART_Receive_DMA(&huart6, u6_RxBuf, bufsize);
  /* USER CODE END USART6_Init 2 */

}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{

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

  /* USER CODE END USART2_MspInit 0 */
/* USART2 clock enable */
__HAL_RCC_USART2_CLK_ENABLE();

__HAL_RCC_GPIOD_CLK_ENABLE();
/**USART2 GPIO Configuration
PD5    ------> USART2_TX
PD6    ------> USART2_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_6;
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_USART2;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

/* USART2 DMA Init */
/* USART2_RX Init */
hdma_usart2_rx.Instance = DMA1_Stream5;
hdma_usart2_rx.Init.Channel = DMA_CHANNEL_4;
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;
hdma_usart2_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart2_rx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmarx,hdma_usart2_rx);

/* USART2_TX Init */
hdma_usart2_tx.Instance = DMA1_Stream6;
hdma_usart2_tx.Init.Channel = DMA_CHANNEL_4;
hdma_usart2_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_usart2_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart2_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart2_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart2_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart2_tx.Init.Mode = DMA_NORMAL;
hdma_usart2_tx.Init.Priority = DMA_PRIORITY_LOW;
hdma_usart2_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart2_tx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmatx,hdma_usart2_tx);

/* USART2 interrupt Init */
HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART2_IRQn);
  /* USER CODE BEGIN USART2_MspInit 1 */

  /* USER CODE END USART2_MspInit 1 */
  }
  else if(uartHandle->Instance==USART6)
  {
  /* USER CODE BEGIN USART6_MspInit 0 */

  /* USER CODE END USART6_MspInit 0 */
/* USART6 clock enable */
__HAL_RCC_USART6_CLK_ENABLE();

__HAL_RCC_GPIOC_CLK_ENABLE();
/**USART6 GPIO Configuration
PC6    ------> USART6_TX
PC7    ------> USART6_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_USART6;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

/* USART6 DMA Init */
/* USART6_RX Init */
hdma_usart6_rx.Instance = DMA2_Stream1;
hdma_usart6_rx.Init.Channel = DMA_CHANNEL_5;
hdma_usart6_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart6_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart6_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart6_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart6_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart6_rx.Init.Mode = DMA_NORMAL;
hdma_usart6_rx.Init.Priority = DMA_PRIORITY_LOW;
hdma_usart6_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart6_rx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmarx,hdma_usart6_rx);

/* USART6_TX Init */
hdma_usart6_tx.Instance = DMA2_Stream6;
hdma_usart6_tx.Init.Channel = DMA_CHANNEL_5;
hdma_usart6_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_usart6_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart6_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart6_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart6_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart6_tx.Init.Mode = DMA_NORMAL;
hdma_usart6_tx.Init.Priority = DMA_PRIORITY_LOW;
hdma_usart6_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart6_tx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmatx,hdma_usart6_tx);

/* USART6 interrupt Init */
HAL_NVIC_SetPriority(USART6_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART6_IRQn);
  /* USER CODE BEGIN USART6_MspInit 1 */

  /* USER CODE END USART6_MspInit 1 */
  }
}

请教如何排查？或者告知该清除哪个标志？