STM32F429串口3 DMA RT_DEVICE_FLAG_DMA_RX模式无法打开

发布于 2020-06-29 17:17:58 浏览：1308 订阅该版

* 本帖最后由 miaomiao 于 2020-6-29 17:19 编辑 *

如题：在使用串口3的DMA接收模式时，使用官方的例程，并且在CubeMX下配置了串口3和DMA，但是在以下程序中串口设备无法打开
    ret = rt_device_open(serial, **RT_DEVICE_FLAG_DMA_RX**);
    if(ret != RT_EOK)
    {
        rt_kprintf("rt_device_open uart3 failed! <br>");
    }

这是我的串口和DMA初始化程序
  else if(huart->Instance==USART3)
  {
  /* USER CODE BEGIN USART3_MspInit 0 */

/* USER CODE END USART3_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_USART3_CLK_ENABLE();

__HAL_RCC_GPIOB_CLK_ENABLE();
    /**USART3 GPIO Configuration    
    PB10     ------> USART3_TX
    PB11     ------> USART3_RX 
    */
    GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11;
    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_USART3;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* USART3 DMA Init */
    /* USART3_RX Init */
    hdma_usart3_rx.Instance = DMA1_Stream1;
    hdma_usart3_rx.Init.Channel = DMA_CHANNEL_4;
    hdma_usart3_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_usart3_rx.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_usart3_rx.Init.MemInc = DMA_MINC_ENABLE;
    hdma_usart3_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_usart3_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    hdma_usart3_rx.Init.Mode = DMA_NORMAL;
    hdma_usart3_rx.Init.Priority = DMA_PRIORITY_VERY_HIGH;
    hdma_usart3_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_usart3_rx) != HAL_OK)
    {
      Error_Handler();
    }

__HAL_LINKDMA(huart,hdmarx,hdma_usart3_rx);

/* USART3 interrupt Init */
    HAL_NVIC_SetPriority(USART3_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(USART3_IRQn);
  /* USER CODE BEGIN USART3_MspInit 1 */

/* USER CODE END USART3_MspInit 1 */
  }