rt-thread/bsp/stm32l475-iot-disco/Libraries/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma.c

/**
  ******************************************************************************
  * @file    stm32l4xx_hal_dma.c
  * @author  MCD Application Team
  * @version V1.7.2
  * @date    16-June-2017
  * @brief   DMA HAL module driver.
  *         This file provides firmware functions to manage the following
  *         functionalities of the Direct Memory Access (DMA) peripheral:
  *           + Initialization and de-initialization functions
  *           + IO operation functions
  *           + Peripheral State and errors functions
  @verbatim
  ==============================================================================
                        ##### How to use this driver #####
  ==============================================================================
  [..]
   (#) Enable and configure the peripheral to be connected to the DMA Channel
       (except for internal SRAM / FLASH memories: no initialization is 
       necessary). Please refer to the Reference manual for connection between peripherals
       and DMA requests.

   (#) For a given Channel, program the required configuration through the following parameters:
       Channel request, Transfer Direction, Source and Destination data formats,
       Circular or Normal mode, Channel Priority level, Source and Destination Increment mode
       using HAL_DMA_Init() function.

       Prior to HAL_DMA_Init the CLK shall be enabled for both DMA thanks to: 
       __HAL_RCC_DMA1_CLK_ENABLE() or  __HAL_RCC_DMA2_CLK_ENABLE()

   (#) Use HAL_DMA_GetState() function to return the DMA state and HAL_DMA_GetError() in case of error 
       detection.
                    
   (#) Use HAL_DMA_Abort() function to abort the current transfer
                   
     -@-   In Memory-to-Memory transfer mode, Circular mode is not allowed.
     *** Polling mode IO operation ***
     =================================
    [..]
          (+) Use HAL_DMA_Start() to start DMA transfer after the configuration of Source
              address and destination address and the Length of data to be transferred
          (+) Use HAL_DMA_PollForTransfer() to poll for the end of current transfer, in this
              case a fixed Timeout can be configured by User depending from his application.

     *** Interrupt mode IO operation ***
     ===================================
    [..]
          (+) Configure the DMA interrupt priority using HAL_NVIC_SetPriority()
          (+) Enable the DMA IRQ handler using HAL_NVIC_EnableIRQ()
          (+) Use HAL_DMA_Start_IT() to start DMA transfer after the configuration of
              Source address and destination address and the Length of data to be transferred.
              In this case the DMA interrupt is configured
          (+) Use HAL_DMA_IRQHandler() called under DMA_IRQHandler() Interrupt subroutine
          (+) At the end of data transfer HAL_DMA_IRQHandler() function is executed and user can
              add his own function by customization of function pointer XferCpltCallback and
              XferErrorCallback (i.e. a member of DMA handle structure).

     *** DMA HAL driver macros list ***
     ============================================= 
      [..]
       Below the list of most used macros in DMA HAL driver.

       (+) __HAL_DMA_ENABLE: Enable the specified DMA Channel.
       (+) __HAL_DMA_DISABLE: Disable the specified DMA Channel.
       (+) __HAL_DMA_GET_FLAG: Get the DMA Channel pending flags.
       (+) __HAL_DMA_CLEAR_FLAG: Clear the DMA Channel pending flags.
       (+) __HAL_DMA_ENABLE_IT: Enable the specified DMA Channel interrupts.
       (+) __HAL_DMA_DISABLE_IT: Disable the specified DMA Channel interrupts.
       (+) __HAL_DMA_GET_IT_SOURCE: Check whether the specified DMA Channel interrupt has occurred or not. 

     [..] 
      (@) You can refer to the DMA HAL driver header file for more useful macros  

  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal.h"

/** @addtogroup STM32L4xx_HAL_Driver
  * @{
  */

/** @defgroup DMA DMA
  * @brief DMA HAL module driver
  * @{
  */

#ifdef HAL_DMA_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup DMA_Private_Functions DMA Private Functions
  * @{
  */
static void DMA_SetConfig(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength);
/**
  * @}
  */

/* Exported functions ---------------------------------------------------------*/

/** @defgroup DMA_Exported_Functions DMA Exported Functions
  * @{
  */

/** @defgroup DMA_Exported_Functions_Group1 Initialization and de-initialization functions
 *  @brief   Initialization and de-initialization functions 
 *
@verbatim
 ===============================================================================
             ##### Initialization and de-initialization functions  #####
 ===============================================================================
    [..]
    This section provides functions allowing to initialize the DMA Channel source
    and destination addresses, incrementation and data sizes, transfer direction, 
    circular/normal mode selection, memory-to-memory mode selection and Channel priority value.
    [..]
    The HAL_DMA_Init() function follows the DMA configuration procedures as described in
    reference manual.  

@endverbatim
  * @{
  */

/**
  * @brief  Initialize the DMA according to the specified
  *         parameters in the DMA_InitTypeDef and initialize the associated handle.
  * @param  hdma: Pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_Init(DMA_HandleTypeDef *hdma)
{
  uint32_t tmp = 0;

  /* Check the DMA handle allocation */
  if(hdma == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_DMA_ALL_INSTANCE(hdma->Instance));
  assert_param(IS_DMA_DIRECTION(hdma->Init.Direction));
  assert_param(IS_DMA_PERIPHERAL_INC_STATE(hdma->Init.PeriphInc));
  assert_param(IS_DMA_MEMORY_INC_STATE(hdma->Init.MemInc));
  assert_param(IS_DMA_PERIPHERAL_DATA_SIZE(hdma->Init.PeriphDataAlignment));
  assert_param(IS_DMA_MEMORY_DATA_SIZE(hdma->Init.MemDataAlignment));
  assert_param(IS_DMA_MODE(hdma->Init.Mode));
  assert_param(IS_DMA_PRIORITY(hdma->Init.Priority));

  if(hdma->Init.Direction != DMA_MEMORY_TO_MEMORY)
  {
    assert_param(IS_DMA_ALL_REQUEST(hdma->Init.Request));
  }
  
  /* calculation of the channel index */
  if ((uint32_t)(hdma->Instance) < (uint32_t)(DMA2_Channel1))
  {
    /* DMA1 */
    hdma->ChannelIndex = (((uint32_t)hdma->Instance - (uint32_t)DMA1_Channel1) / ((uint32_t)DMA1_Channel2 - (uint32_t)DMA1_Channel1)) << 2;
    hdma->DmaBaseAddress = DMA1;
  }
  else 
  {
    /* DMA2 */
    hdma->ChannelIndex = (((uint32_t)hdma->Instance - (uint32_t)DMA2_Channel1) / ((uint32_t)DMA2_Channel2 - (uint32_t)DMA2_Channel1)) << 2;
    hdma->DmaBaseAddress = DMA2;
  }

  /* Change DMA peripheral state */
  hdma->State = HAL_DMA_STATE_BUSY;

  /* Get the CR register value */
  tmp = hdma->Instance->CCR;

  /* Clear PL, MSIZE, PSIZE, MINC, PINC, CIRC, DIR bits */
  tmp &= ((uint32_t)~(DMA_CCR_PL    | DMA_CCR_MSIZE  | DMA_CCR_PSIZE  | \
                      DMA_CCR_MINC  | DMA_CCR_PINC   | DMA_CCR_CIRC   | \
                      DMA_CCR_DIR));

  /* Prepare the DMA Channel configuration */
  tmp |=  hdma->Init.Direction        |
          hdma->Init.PeriphInc           | hdma->Init.MemInc           |
          hdma->Init.PeriphDataAlignment | hdma->Init.MemDataAlignment |
          hdma->Init.Mode                | hdma->Init.Priority;

  /* Write to DMA Channel CR register */
  hdma->Instance->CCR = tmp;

  /* Set request selection */
  if(hdma->Init.Direction != DMA_MEMORY_TO_MEMORY)
  {
    /* Write to DMA channel selection register */
    if (DMA1 == hdma->DmaBaseAddress)
    {
      /* Reset request selection for DMA1 Channelx */
      DMA1_CSELR->CSELR &= ~(DMA_CSELR_C1S << hdma->ChannelIndex);

      /* Configure request selection for DMA1 Channelx */
      DMA1_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << (hdma->ChannelIndex)); 
    }
    else /* DMA2 */
    {
      /* Reset request selection for DMA2 Channelx */
      DMA2_CSELR->CSELR &= ~(DMA_CSELR_C1S << hdma->ChannelIndex);
     
      /* Configure request selection for DMA2 Channelx */
      DMA2_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << (hdma->ChannelIndex)); 
    }
  }

  /* Clean callbacks */
  hdma->XferCpltCallback = NULL;
  hdma->XferHalfCpltCallback = NULL;
  hdma->XferErrorCallback = NULL;
  hdma->XferAbortCallback = NULL;

  /* Initialise the error code */
  hdma->ErrorCode = HAL_DMA_ERROR_NONE;

  /* Initialize the DMA state*/
  hdma->State  = HAL_DMA_STATE_READY;

  /* Allocate lock resource and initialize it */
  hdma->Lock = HAL_UNLOCKED;
  
  return HAL_OK;
}

/**
  * @brief  DeInitialize the DMA peripheral.
  * @param  hdma: pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_DeInit(DMA_HandleTypeDef *hdma)
{
  /* Check the DMA handle allocation */
  if(hdma == NULL)
  {
    return HAL_ERROR;
  }
  
  /* Check the parameters */
  assert_param(IS_DMA_ALL_INSTANCE(hdma->Instance));

  /* Disable the selected DMA Channelx */
  __HAL_DMA_DISABLE(hdma);

  /* Reset DMA Channel control register */
  hdma->Instance->CCR  = 0;

  /* Calculation of the channel index */
  if ((uint32_t)(hdma->Instance) < (uint32_t)(DMA2_Channel1))
  {
    /* DMA1 */
    hdma->ChannelIndex = (((uint32_t)hdma->Instance - (uint32_t)DMA1_Channel1) / ((uint32_t)DMA1_Channel2 - (uint32_t)DMA1_Channel1)) << 2;
    hdma->DmaBaseAddress = DMA1;
  }
  else 
  {
    /* DMA2 */
    hdma->ChannelIndex = (((uint32_t)hdma->Instance - (uint32_t)DMA2_Channel1) / ((uint32_t)DMA2_Channel2 - (uint32_t)DMA2_Channel1)) << 2;
    hdma->DmaBaseAddress = DMA2;
  }
  

  /* Clear all flags */
  hdma->DmaBaseAddress->IFCR = (DMA_ISR_GIF1 << hdma->ChannelIndex);

  /* Reset DMA channel selection register */
  if (DMA1 == hdma->DmaBaseAddress)
  {
    /* DMA1 */
    DMA1_CSELR->CSELR &= ~(DMA_CSELR_C1S << (hdma->ChannelIndex)); 
  }
  else  
  {
    /* DMA2 */
    DMA2_CSELR->CSELR &= ~(DMA_CSELR_C1S << (hdma->ChannelIndex)); 
  }

  /* Initialize the error code */
  hdma->ErrorCode = HAL_DMA_ERROR_NONE;

  /* Initialize the DMA state */
  hdma->State = HAL_DMA_STATE_RESET;

  /* Release Lock */
  __HAL_UNLOCK(hdma);

  return HAL_OK;
}

/**
  * @}
  */

/** @defgroup DMA_Exported_Functions_Group2 Input and Output operation functions
 *  @brief   Input and Output operation functions
 *
@verbatim
 ===============================================================================
                      #####  IO operation functions  #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Configure the source, destination address and data length and Start DMA transfer
      (+) Configure the source, destination address and data length and
          Start DMA transfer with interrupt
      (+) Abort DMA transfer
      (+) Poll for transfer complete
      (+) Handle DMA interrupt request

@endverbatim
  * @{
  */

/**
  * @brief  Start the DMA Transfer.
  * @param  hdma: pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
  * @param  SrcAddress: The source memory Buffer address
  * @param  DstAddress: The destination memory Buffer address
  * @param  DataLength: The length of data to be transferred from source to destination
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_Start(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the parameters */
  assert_param(IS_DMA_BUFFER_SIZE(DataLength));

  /* Process locked */
  __HAL_LOCK(hdma);

  if(HAL_DMA_STATE_READY == hdma->State)
  {
    /* Change DMA peripheral state */
    hdma->State = HAL_DMA_STATE_BUSY;
    hdma->ErrorCode = HAL_DMA_ERROR_NONE;
            
    /* Disable the peripheral */
    __HAL_DMA_DISABLE(hdma);
    
    /* Configure the source, destination address and the data length & clear flags*/
    DMA_SetConfig(hdma, SrcAddress, DstAddress, DataLength);
    
    /* Enable the Peripheral */
    __HAL_DMA_ENABLE(hdma);
  }
  else
  {
   /* Process Unlocked */
   __HAL_UNLOCK(hdma);  
   status = HAL_BUSY;
  }  
  return status;
}

/**
  * @brief  Start the DMA Transfer with interrupt enabled.
  * @param  hdma: pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
  * @param  SrcAddress: The source memory Buffer address
  * @param  DstAddress: The destination memory Buffer address
  * @param  DataLength: The length of data to be transferred from source to destination
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_Start_IT(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the parameters */
  assert_param(IS_DMA_BUFFER_SIZE(DataLength));

  /* Process locked */
  __HAL_LOCK(hdma);
  
  if(HAL_DMA_STATE_READY == hdma->State)
  {
    /* Change DMA peripheral state */
    hdma->State = HAL_DMA_STATE_BUSY;
    hdma->ErrorCode = HAL_DMA_ERROR_NONE;
    
    /* Disable the peripheral */
    __HAL_DMA_DISABLE(hdma);
    
    /* Configure the source, destination address and the data length & clear flags*/
    DMA_SetConfig(hdma, SrcAddress, DstAddress, DataLength);
    
    /* Enable the transfer complete interrupt */
    /* Enable the transfer Error interrupt */
    if(NULL != hdma->XferHalfCpltCallback )
    {
      /* Enable the Half transfer complete interrupt as well */
      __HAL_DMA_ENABLE_IT(hdma, (DMA_IT_TC | DMA_IT_HT | DMA_IT_TE));
    }
    else
    {
      __HAL_DMA_DISABLE_IT(hdma, DMA_IT_HT);
      __HAL_DMA_ENABLE_IT(hdma, (DMA_IT_TC | DMA_IT_TE));
    }
    /* Enable the Peripheral */
    __HAL_DMA_ENABLE(hdma);
  }
  else
  {      
    /* Process Unlocked */
    __HAL_UNLOCK(hdma); 

    /* Remain BUSY */
    status = HAL_BUSY;
  }    
  return status;
}

/**
  * @brief  Abort the DMA Transfer.
  * @param  hdma: pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
    * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_Abort(DMA_HandleTypeDef *hdma)
{
  HAL_StatusTypeDef status = HAL_OK;

  if(HAL_DMA_STATE_BUSY != hdma->State)
  {
    /* no transfer ongoing */
    hdma->ErrorCode = HAL_DMA_ERROR_NO_XFER;
        
    status = HAL_ERROR;
  }
  else
  {
    /* Disable DMA IT */
    __HAL_DMA_DISABLE_IT(hdma, (DMA_IT_TC | DMA_IT_HT | DMA_IT_TE));
    
    /* Disable the channel */
    __HAL_DMA_DISABLE(hdma);
    
    /* Clear all flags */
    hdma->DmaBaseAddress->IFCR = (DMA_ISR_GIF1 << hdma->ChannelIndex);

    /* Change the DMA state */
    hdma->State = HAL_DMA_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(hdma);      
  }
  return status; 
}

/**
  * @brief  Aborts the DMA Transfer in Interrupt mode.
  * @param  hdma  : pointer to a DMA_HandleTypeDef structure that contains
  *                 the configuration information for the specified DMA Channel.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_Abort_IT(DMA_HandleTypeDef *hdma)
{  
  HAL_StatusTypeDef status = HAL_OK;
  
  if(HAL_DMA_STATE_BUSY != hdma->State)
  {
    /* no transfer ongoing */
    hdma->ErrorCode = HAL_DMA_ERROR_NO_XFER;
        
    status = HAL_ERROR;
  }
  else
  { 
    /* Disable DMA IT */
    __HAL_DMA_DISABLE_IT(hdma, (DMA_IT_TC | DMA_IT_HT | DMA_IT_TE));
    
    /* Disable the channel */
    __HAL_DMA_DISABLE(hdma);
    
    /* Clear all flags */
    hdma->DmaBaseAddress->IFCR = (DMA_ISR_GIF1 << hdma->ChannelIndex);
    
    /* Change the DMA state */
    hdma->State = HAL_DMA_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(hdma);
    
    /* Call User Abort callback */ 
    if(hdma->XferAbortCallback != NULL)
    {
      hdma->XferAbortCallback(hdma);
    } 
  }
  return status;
}

/**
  * @brief  Polling for transfer complete.
  * @param  hdma:    pointer to a DMA_HandleTypeDef structure that contains
  *                  the configuration information for the specified DMA Channel.
  * @param  CompleteLevel: Specifies the DMA level complete.
  * @param  Timeout:       Timeout duration.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_PollForTransfer(DMA_HandleTypeDef *hdma, uint32_t CompleteLevel, uint32_t Timeout)
{
  uint32_t temp;
  uint32_t tickstart = 0;

  if(HAL_DMA_STATE_BUSY != hdma->State)
  {
    /* no transfer ongoing */
    hdma->ErrorCode = HAL_DMA_ERROR_NO_XFER;

    return HAL_ERROR;
  }

  /* Polling mode not supported in circular mode */
  if (RESET != (hdma->Instance->CCR & DMA_CCR_CIRC))
  {
    hdma->ErrorCode = HAL_DMA_ERROR_NOT_SUPPORTED;
    return HAL_ERROR;
  }
  
  /* Get the level transfer complete flag */
  if (HAL_DMA_FULL_TRANSFER == CompleteLevel)
  {
    /* Transfer Complete flag */
    temp = DMA_FLAG_TC1 << hdma->ChannelIndex;
  }
  else
  {
    /* Half Transfer Complete flag */
    temp = DMA_FLAG_HT1 << hdma->ChannelIndex;
  }

  /* Get tick */
  tickstart = HAL_GetTick();

  while(RESET == (hdma->DmaBaseAddress->ISR & temp))     
  {
    if((RESET != (hdma->DmaBaseAddress->ISR & (DMA_FLAG_TE1 << hdma->ChannelIndex))))    
    {
      /* When a DMA transfer error occurs */
      /* A hardware clear of its EN bits is performed */
      /* Clear all flags */
      hdma->DmaBaseAddress->IFCR = (DMA_ISR_GIF1 << hdma->ChannelIndex);

      /* Update error code */
      hdma->ErrorCode = HAL_DMA_ERROR_TE;

      /* Change the DMA state */
      hdma->State= HAL_DMA_STATE_READY;

      /* Process Unlocked */
      __HAL_UNLOCK(hdma);

      return HAL_ERROR;
    }
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0) || ((HAL_GetTick() - tickstart) > Timeout))
      {
        /* Update error code */
        hdma->ErrorCode = HAL_DMA_ERROR_TIMEOUT;

        /* Change the DMA state */
        hdma->State = HAL_DMA_STATE_READY;
        
        /* Process Unlocked */
        __HAL_UNLOCK(hdma);

        return HAL_ERROR;
      }
    }
  }

  if(HAL_DMA_FULL_TRANSFER == CompleteLevel)
  {
    /* Clear the transfer complete flag */
    hdma->DmaBaseAddress->IFCR = (DMA_FLAG_TC1 << hdma->ChannelIndex);

    /* The selected Channelx EN bit is cleared (DMA is disabled and
    all transfers are complete) */
    hdma->State = HAL_DMA_STATE_READY;
  }
  else
  {
    /* Clear the half transfer complete flag */
    hdma->DmaBaseAddress->IFCR = (DMA_FLAG_HT1 << hdma->ChannelIndex);
  }
  
  /* Process unlocked */
  __HAL_UNLOCK(hdma);  

  return HAL_OK;
}

/**
  * @brief  Handle DMA interrupt request.
  * @param  hdma: pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
  * @retval None
  */
void HAL_DMA_IRQHandler(DMA_HandleTypeDef *hdma)
{
  uint32_t flag_it = hdma->DmaBaseAddress->ISR;
  uint32_t source_it = hdma->Instance->CCR;
  
  /* Half Transfer Complete Interrupt management ******************************/
  if ((RESET != (flag_it & (DMA_FLAG_HT1 << hdma->ChannelIndex))) && (RESET != (source_it & DMA_IT_HT)))
  {
      /* Disable the half transfer interrupt if the DMA mode is not CIRCULAR */
      if((hdma->Instance->CCR & DMA_CCR_CIRC) == 0)
      {
        /* Disable the half transfer interrupt */
        __HAL_DMA_DISABLE_IT(hdma, DMA_IT_HT);
      }
      /* Clear the half transfer complete flag */
      hdma->DmaBaseAddress->IFCR = (DMA_ISR_HTIF1 << hdma->ChannelIndex);

      /* DMA peripheral state is not updated in Half Transfer */
      /* but in Transfer Complete case */

     if(hdma->XferHalfCpltCallback != NULL)
      {
        /* Half transfer callback */
        hdma->XferHalfCpltCallback(hdma);
      }
  }
  
  /* Transfer Complete Interrupt management ***********************************/
  else if ((RESET != (flag_it & (DMA_FLAG_TC1 << hdma->ChannelIndex))) && (RESET != (source_it & DMA_IT_TC)))
  {
    if((hdma->Instance->CCR & DMA_CCR_CIRC) == 0)
    {
      /* Disable the transfer complete and error interrupt */
      __HAL_DMA_DISABLE_IT(hdma, (DMA_IT_TC | DMA_IT_TE));

      /* Change the DMA state */
      hdma->State = HAL_DMA_STATE_READY;
    }
    /* Clear the transfer complete flag */
    hdma->DmaBaseAddress->IFCR = (DMA_ISR_TCIF1 << hdma->ChannelIndex);

    /* Process Unlocked */
    __HAL_UNLOCK(hdma);

    if(hdma->XferCpltCallback != NULL)
    {
      /* Transfer complete callback */
      hdma->XferCpltCallback(hdma);
    }
  }

  /* Transfer Error Interrupt management **************************************/
  else if (( RESET != (flag_it & (DMA_FLAG_TE1 << hdma->ChannelIndex))) && (RESET != (source_it & DMA_IT_TE)))
  {
    /* When a DMA transfer error occurs */
    /* A hardware clear of its EN bits is performed */
    /* Disable ALL DMA IT */
    __HAL_DMA_DISABLE_IT(hdma, (DMA_IT_TC | DMA_IT_HT | DMA_IT_TE));

    /* Clear all flags */
    hdma->DmaBaseAddress->IFCR = (DMA_ISR_GIF1 << hdma->ChannelIndex);

    /* Update error code */
    hdma->ErrorCode = HAL_DMA_ERROR_TE;

    /* Change the DMA state */
    hdma->State = HAL_DMA_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(hdma);

    if (hdma->XferErrorCallback != NULL)
    {
      /* Transfer error callback */
      hdma->XferErrorCallback(hdma);
    }
  }
  return;
}

/**
  * @brief  Register callbacks
  * @param  hdma:                 pointer to a DMA_HandleTypeDef structure that contains
  *                               the configuration information for the specified DMA Channel.
  * @param  CallbackID:           User Callback identifer
  *                               a HAL_DMA_CallbackIDTypeDef ENUM as parameter.
  * @param  pCallback:            pointer to private callbacsk function which has pointer to 
  *                               a DMA_HandleTypeDef structure as parameter.
  * @retval HAL status
  */                          
HAL_StatusTypeDef HAL_DMA_RegisterCallback(DMA_HandleTypeDef *hdma, HAL_DMA_CallbackIDTypeDef CallbackID, void (* pCallback)( DMA_HandleTypeDef * _hdma))
{
  HAL_StatusTypeDef status = HAL_OK;
  
  /* Process locked */
  __HAL_LOCK(hdma);
  
  if(HAL_DMA_STATE_READY == hdma->State)
  {
    switch (CallbackID)
    {
     case  HAL_DMA_XFER_CPLT_CB_ID:
           hdma->XferCpltCallback = pCallback;
           break;
       
     case  HAL_DMA_XFER_HALFCPLT_CB_ID:
           hdma->XferHalfCpltCallback = pCallback;
           break;         

     case  HAL_DMA_XFER_ERROR_CB_ID:
           hdma->XferErrorCallback = pCallback;
           break;         
           
     case  HAL_DMA_XFER_ABORT_CB_ID:
           hdma->XferAbortCallback = pCallback;
           break; 
           
     default:
           status = HAL_ERROR;
           break;                                                            
    }
  }
  else
  {
    status = HAL_ERROR;
  } 
  
  /* Release Lock */
  __HAL_UNLOCK(hdma);
  
  return status;
}

/**
  * @brief  UnRegister callbacks
  * @param  hdma:                 pointer to a DMA_HandleTypeDef structure that contains
  *                               the configuration information for the specified DMA Channel.
  * @param  CallbackID:           User Callback identifer
  *                               a HAL_DMA_CallbackIDTypeDef ENUM as parameter.
  * @retval HAL status
  */              
HAL_StatusTypeDef HAL_DMA_UnRegisterCallback(DMA_HandleTypeDef *hdma, HAL_DMA_CallbackIDTypeDef CallbackID)
{
  HAL_StatusTypeDef status = HAL_OK;

    /* Process locked */
  __HAL_LOCK(hdma);
  
  if(HAL_DMA_STATE_READY == hdma->State)
  {
    switch (CallbackID)
    {
     case  HAL_DMA_XFER_CPLT_CB_ID:
           hdma->XferCpltCallback = NULL;
           break;
       
     case  HAL_DMA_XFER_HALFCPLT_CB_ID:
           hdma->XferHalfCpltCallback = NULL;
           break;         

     case  HAL_DMA_XFER_ERROR_CB_ID:
           hdma->XferErrorCallback = NULL;
           break;         
           
     case  HAL_DMA_XFER_ABORT_CB_ID:
           hdma->XferAbortCallback = NULL;
           break; 
     
    case   HAL_DMA_XFER_ALL_CB_ID:
           hdma->XferCpltCallback = NULL;
           hdma->XferHalfCpltCallback = NULL;
           hdma->XferErrorCallback = NULL;
           hdma->XferAbortCallback = NULL;
           break; 
     
    default:
           status = HAL_ERROR;
           break;                                                            
    }
  }
  else
  {
    status = HAL_ERROR;
  } 
  
  /* Release Lock */
  __HAL_UNLOCK(hdma);
  
  return status;
}
  
/**
  * @}
  */



/** @defgroup DMA_Exported_Functions_Group3 Peripheral State and Errors functions
 *  @brief    Peripheral State and Errors functions
 *
@verbatim
 ===============================================================================
            ##### Peripheral State and Errors functions #####
 ===============================================================================  
    [..]
    This subsection provides functions allowing to
      (+) Check the DMA state
      (+) Get error code

@endverbatim
  * @{
  */

/**
  * @brief  Return the DMA hande state.
  * @param  hdma: pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
  * @retval HAL state
  */
HAL_DMA_StateTypeDef HAL_DMA_GetState(DMA_HandleTypeDef *hdma)
{
  /* Return DMA handle state */
  return hdma->State;
}

/**
  * @brief  Return the DMA error code.
  * @param  hdma : pointer to a DMA_HandleTypeDef structure that contains
  *              the configuration information for the specified DMA Channel.
  * @retval DMA Error Code
  */
uint32_t HAL_DMA_GetError(DMA_HandleTypeDef *hdma)
{
  return hdma->ErrorCode;
}

/**
  * @}
  */

/**
  * @}
  */

/** @addtogroup DMA_Private_Functions
  * @{
  */

/**
  * @brief  Sets the DMA Transfer parameter.
  * @param  hdma:       pointer to a DMA_HandleTypeDef structure that contains
  *                     the configuration information for the specified DMA Channel.
  * @param  SrcAddress: The source memory Buffer address
  * @param  DstAddress: The destination memory Buffer address
  * @param  DataLength: The length of data to be transferred from source to destination
  * @retval HAL status
  */
static void DMA_SetConfig(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)
{
  /* Clear all flags */
  hdma->DmaBaseAddress->IFCR = (DMA_ISR_GIF1 << hdma->ChannelIndex);
  
  /* Configure DMA Channel data length */
  hdma->Instance->CNDTR = DataLength;

  /* Peripheral to Memory */
  if((hdma->Init.Direction) == DMA_MEMORY_TO_PERIPH)
  {
    /* Configure DMA Channel destination address */
    hdma->Instance->CPAR = DstAddress;

    /* Configure DMA Channel source address */
    hdma->Instance->CMAR = SrcAddress;
  }
  /* Memory to Peripheral */
  else
  {
    /* Configure DMA Channel source address */
    hdma->Instance->CPAR = SrcAddress;

    /* Configure DMA Channel destination address */
    hdma->Instance->CMAR = DstAddress;
  }
}

/**
  * @}
  */

/**
  * @}
  */

#endif /* HAL_DMA_MODULE_ENABLED */
/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/