学习笔记+STM32F0系列的STM32Cube固件例程 DMA

int main(void)

{

  /* STM32F0xx HAL library initialization:

       - Configure the Flash prefetch

       - Systick timer is configured by default as source of time base, but user 

         can eventually implement his proper time base source (a general purpose 

         timer for example or other time source), keeping in mind that Time base 

         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 

         handled in milliseconds basis.

       - Low Level Initialization

     */

  HAL_Init();



  /* Configure the system clock to 48 MHz */

  SystemClock_Config();



  /* Initialize LED */

  BSP_LED_Init(LED2);



  /* Set to 1 if an transfer error is detected */

  transferErrorDetected = 0;



  /* Configure and enable the DMA channel for Memory to Memory transfer */

  DMA_Config();



  /* Infinite loop */

  while (1)

  {

    if (transferErrorDetected == 1)

    {

      /* Toggle LED2 with a period of 200 ms */

      BSP_LED_Toggle(LED2);

      HAL_Delay(200);

    }

  }

}

/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Configure the DMA controller according to the parameters

  *         defined in main.h file

  * [url=home.php?mod=space&uid=536309]@NOTE[/url]  This function is used to :

  *        -1- Enable DMA1 clock

  *        -2- Select the DMA functional Parameters

  *        -3- Select the DMA instance to be used for the transfer

  *        -4- Initialize the DMA channel

  *        -5- Select Callbacks functions called after Transfer complete and

  *            Transfer error interrupt detection

  *        -6- Configure NVIC for DMA transfer complete/error interrupts

  *        -7- Start the DMA transfer using the interrupt mode

  * @param  None

  * @retval None

  */

static void DMA_Config(void)

{

  /*## -1- Enable DMA1 clock #################################################*/

  __HAL_RCC_DMA1_CLK_ENABLE();



  /*##-2- Select the DMA functional Parameters ###############################*/

  DmaHandle.Init.Direction = DMA_MEMORY_TO_MEMORY;          /* M2M transfer mode                */

  DmaHandle.Init.PeriphInc = DMA_PINC_ENABLE;               /* Peripheral increment mode Enable */

  DmaHandle.Init.MemInc = DMA_MINC_ENABLE;                  /* Memory increment mode Enable     */

  DmaHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD; /* Peripheral data alignment : Word */

  DmaHandle.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;    /* memory data alignment : Word     */

  DmaHandle.Init.Mode = DMA_NORMAL;                         /* Normal DMA mode                  */

  DmaHandle.Init.Priority = DMA_PRIORITY_HIGH;              /* priority level : high            */



  /*##-3- Select the DMA instance to be used for the transfer : DMA1_Channel1 #*/

  DmaHandle.Instance = DMA_INSTANCE;



  /*##-4- Initialize the DMA channel ##########################################*/

  if (HAL_DMA_Init(&DmaHandle) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }

  

  /*##-5- Select Callbacks functions called after Transfer complete and Transfer error */

  HAL_DMA_RegisterCallback(&DmaHandle, HAL_DMA_XFER_CPLT_CB_ID, TransferComplete);

  HAL_DMA_RegisterCallback(&DmaHandle, HAL_DMA_XFER_ERROR_CB_ID, TransferError);



  /*##-6- Configure NVIC for DMA transfer complete/error interrupts ##########*/

  /* Set Interrupt Group Priority */

  HAL_NVIC_SetPriority(DMA_INSTANCE_IRQ, 0, 0);



  /* Enable the DMA global Interrupt */

  HAL_NVIC_EnableIRQ(DMA_INSTANCE_IRQ);



  /*##-7- Start the DMA transfer using the interrupt mode ####################*/

  /* Configure the source, destination and buffer size DMA fields and Start DMA transfer */

  /* Enable All the DMA interrupts */

  if (HAL_DMA_Start_IT(&DmaHandle, (uint32_t)&aSRC_Const_Buffer, (uint32_t)&aDST_Buffer, BUFFER_SIZE) != HAL_OK)

  {

    /* Transfer Error */

    Error_Handler();

  }

}

static void TransferComplete(DMA_HandleTypeDef *DmaHandle)

{

  /* Turn LED2 on: Transfer correct */

  BSP_LED_On(LED2);

}

static void TransferError(DMA_HandleTypeDef *DmaHandle)

{

  transferErrorDetected = 1;

}