407741522 发表于 2016-1-26 19:04
嘿嘿，楼主你的dma历程有上传吗？

这里我用的STM32L151RD 因为SPI和USART3 RX都是DMA 通道3 所以我用USART3 RX没有通道3，其实可以共用一个通道的，它的回调函数里面添加一个判断就可以了，主要我不交互用不到RX。
[mw_shl_code=applescript,true]void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{

  GPIO_InitTypeDef GPIO_InitStruct;
  if(huart->Instance==USART3)
  {
  /* USER CODE BEGIN USART3_MspInit 0 */

  /* USER CODE END USART3_MspInit 0 */
    /* Peripheral clock enable */
    __USART3_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_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF7_USART3;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    /* Peripheral DMA init*/
  
    hdma_usart3_tx.Instance = DMA1_Channel2;
    hdma_usart3_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
    hdma_usart3_tx.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_usart3_tx.Init.MemInc = DMA_MINC_DISABLE;
    hdma_usart3_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_usart3_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    hdma_usart3_tx.Init.Mode = DMA_NORMAL;
    hdma_usart3_tx.Init.Priority = DMA_PRIORITY_LOW;
    HAL_DMA_Init(&hdma_usart3_tx);

    __HAL_LINKDMA(huart,hdmatx,hdma_usart3_tx);

  /* USER CODE BEGIN USART3_MspInit 1 */

  /* USER CODE END USART3_MspInit 1 */
  }

}[/mw_shl_code]



/* USART3 init function */
void MX_USART3_UART_Init(void)
{

  huart3.Instance = USART3;
  huart3.Init.BaudRate = 115200;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  HAL_UART_Init(&huart3);

}