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Asked:2020-03-03 21:22:47 +0000 UTC2020-03-03 21:22:47 +0000 UTC

STM32 HAL_UART_Transmit_DMA 功能不工作

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Stone STM32F103C8，在CubeMX中创建工程，设置标准-USART2为异步模式，激活其全局中断，创建DMA通道：创建 DMA 通道

我生成一个项目并将以下代码添加到while中：

  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
      HAL_UART_Transmit_DMA(&huart2, buff, 100);
      HAL_Delay(100);
  }

我编译，闪存和......什么都没有！Tx 腿一直很高，没有传输的迹象。同时，HAL_UART_Transmit_IT 函数工作正常，具有类似设置的相同代码在 STM32F407VG (Discovery) 上工作。尝试了其他石头F103C8，尝试在不同的地方调用HAL_UART_Abort，HAL_DMA_Abort - 没有成功。

我注意到，在调用 HAL_UART_Transmit_DMA 之后，立即调用了 DMA 中断处理程序，其中 HAL 发出传输完成的判断，这意味着什么？HAL 坏了？

PS这里是USART-a和DMA初始化代码

static 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 = 100;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_2;
  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 */

  /* USER CODE END USART2_Init 2 */

}

/** 
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void) 
{

  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Channel7_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel7_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel7_IRQn);

}
stm32

1 个回答

  1. Best Answer

    DMA 未在您的代码中初始化。下面是我的一段代码：

    void StandardUart::initialize()
{

    ...
    // инициализируем сам Uart
    mHUart->Init.BaudRate = UART_BAUD_RATE;
    mHUart->Init.WordLength = UART_WORDLENGTH_8B;
    mHUart->Init.StopBits = UART_STOPBITS_1;
    mHUart->Init.Parity = UART_PARITY_NONE;
    mHUart->Init.Mode = UART_MODE_TX_RX;
    mHUart->Init.HwFlowCtl = UART_HWCONTROL_NONE;
    mHUart->Init.OverSampling = UART_OVERSAMPLING_16;

    //NOTE: Покамест оставил без дополнительной инициаизации
    // DMA initialization
    /* DMA controller clock enable */
    __HAL_RCC_DMA1_CLK_ENABLE();

    /*##-3- Configure the DMA ##################################################*/
    /* Configure the DMA handler for Transmission process */
    static DMA_HandleTypeDef hdma_tx; //никуда не должен деться
    hdma_tx.Instance                 = DMA1_Channel4;
    hdma_tx.Init.Direction           = DMA_MEMORY_TO_PERIPH;
    hdma_tx.Init.PeriphInc           = DMA_PINC_DISABLE;
    hdma_tx.Init.MemInc              = DMA_MINC_ENABLE;
    hdma_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_tx.Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
    hdma_tx.Init.Mode                = DMA_NORMAL;
    hdma_tx.Init.Priority            = DMA_PRIORITY_LOW;

    HAL_DMA_Init(&hdma_tx);

    /* Associate the initialized DMA handle to the UART handle */
    __HAL_LINKDMA(mHUart, hdmatx, hdma_tx);

    /* Configure the DMA handler for reception process */
    static DMA_HandleTypeDef hdma_rx;
    hdma_rx.Instance                 = DMA1_Channel5;
    hdma_rx.Init.Direction           = DMA_PERIPH_TO_MEMORY;
    hdma_rx.Init.PeriphInc           = DMA_PINC_DISABLE;
    hdma_rx.Init.MemInc              = DMA_MINC_ENABLE;
    hdma_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_rx.Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
    hdma_rx.Init.Mode                = DMA_CIRCULAR;
    hdma_rx.Init.Priority            = DMA_PRIORITY_HIGH;

    HAL_DMA_Init(&hdma_rx);
    /* Associate the initialized DMA handle to the the UART handle */
    __HAL_LINKDMA(mHUart, hdmarx, hdma_rx);


    /* DMA interrupt init */
    /* DMA1_Channel4_IRQn interrupt configuration */
    HAL_NVIC_SetPriority(DMA1_Channel4_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(DMA1_Channel4_IRQn);
    /* DMA1_Channel5_IRQn interrupt configuration */
    HAL_NVIC_SetPriority(DMA1_Channel5_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(DMA1_Channel5_IRQn);

    // UART initialization
    // подключаем тактирование самого USART
    IRQn_Type Irq = USART1_IRQn;
    if (mHUart->Instance == USART2){
        __HAL_RCC_USART2_CLK_ENABLE();
        Irq = USART2_IRQn;
    }
    if (mHUart->Instance == USART3){
        __HAL_RCC_USART3_CLK_ENABLE();
        Irq = USART3_IRQn;
    }

    HAL_UART_DeInit(mHUart);
    HAL_UART_Init(mHUart);

    /* Peripheral interrupt init */
    HAL_NVIC_SetPriority(Irq, 0, 0);
    HAL_NVIC_EnableIRQ(Irq);

    HAL_UART_Receive_DMA(mHUart,
                         mRxBuffer,
                         MaxBufferSize);
}

    所见：

    • 没有 DMA 初始化。HAL_DMA_Init(&hdma_tx)
    • 没有与 UART 的 DMA 链接__HAL_LINKDMA(mHUart, hdmatx, hdma_tx)
    • 在代码中我没有看到包含 UART 时钟__HAL_RCC_USART2_CLK_ENABLE();
    • 2

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