/**
  ******************************************************************************
  * @file    stm32l4xx_hal_dma.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    26-June-2015
  * @brief   DMA HAL module driver.
  *         This file provides firmware functions to manage the following
  *         functionalities of the Direct Memory Access (DMA) peripheral:
  *           + Initialization/de-initialization functions
  *           + I/O 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.

     *** 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).

      [..]
     (#) 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.

  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 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 ------------------------------------------------------------*/
/** @defgroup DMA_Private_Constants DMA Private Constants
  * @{
  */
#define HAL_TIMEOUT_DMA_ABORT    ((uint32_t)1000)  /* 1s  */
/**
  * @}
  */

/* Private macros ------------------------------------------------------------*/
/* 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/de-initialization functions
 *  @brief   Initialization/de-initialization functions
 *
@verbatim
 ===============================================================================
             ##### Initialization and de-initialization functions  #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Initialize and configure the DMA
      (+) De-Initialize the DMA

@endverbatim
  * @{
  */

/**
  * @brief  Initializes 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));
  }
  
  if(hdma->State == HAL_DMA_STATE_RESET)
  {  
    /* Allocate lock resource and initialize it */
    hdma->Lock = HAL_UNLOCKED;
  }

  /* 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 (hdma->Instance == DMA1_Channel1)
    {
      /*Reset request selection for DMA1 Channel1*/
      DMA1_CSELR->CSELR &= ~DMA_CSELR_C1S;

      /* Configure request selection for DMA1 Channel1 */
      DMA1_CSELR->CSELR |= hdma->Init.Request;
    }
    else if (hdma->Instance == DMA1_Channel2)
    {
      /*Reset request selection for DMA1 Channel2*/
      DMA1_CSELR->CSELR &= ~DMA_CSELR_C2S;

      /* Configure request selection for DMA1 Channel2 */
      DMA1_CSELR->CSELR |= (uint32_t)(hdma->Init.Request << 4);
    }
    else if (hdma->Instance == DMA1_Channel3)
    {
      /*Reset request selection for DMA1 Channel3*/
      DMA1_CSELR->CSELR &= ~DMA_CSELR_C3S;

      /* Configure request selection for DMA1 Channel3 */
      DMA1_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 8);
    }
    else if (hdma->Instance == DMA1_Channel4)
    {
      /*Reset request selection for DMA1 Channel4*/
      DMA1_CSELR->CSELR &= ~DMA_CSELR_C4S;

      /* Configure request selection for DMA1 Channel4 */
      DMA1_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 12);
    }
    else if (hdma->Instance == DMA1_Channel5)
    {
      /*Reset request selection for DMA1 Channel5*/
      DMA1_CSELR->CSELR &= ~DMA_CSELR_C5S;

      /* Configure request selection for DMA1 Channel5 */
      DMA1_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 16);
    }
    else if (hdma->Instance == DMA1_Channel6)
    {
      /*Reset request selection for DMA1 Channel6*/
      DMA1_CSELR->CSELR &= ~DMA_CSELR_C6S;

      /* Configure request selection for DMA1 Channel6 */
      DMA1_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 20);
    }
    else if (hdma->Instance == DMA1_Channel7)
    {
      /*Reset request selection for DMA1 Channel7*/
      DMA1_CSELR->CSELR &= ~DMA_CSELR_C7S;

      /* Configure request selection for DMA1 Channel7 */
      DMA1_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 24);
    }
    else if (hdma->Instance == DMA2_Channel1)
    {
      /*Reset request selection for DMA2 Channel1*/
      DMA2_CSELR->CSELR &= ~DMA_CSELR_C1S;

      /* Configure request selection for DMA2 Channel1 */
      DMA2_CSELR->CSELR |= hdma->Init.Request;
    }
    else if (hdma->Instance == DMA2_Channel2)
    {
      /*Reset request selection for DMA2 Channel2*/
      DMA2_CSELR->CSELR &= ~DMA_CSELR_C2S;

      /* Configure request selection for DMA2 Channel2 */
      DMA2_CSELR->CSELR |= (uint32_t)(hdma->Init.Request << 4);
    }
    else if (hdma->Instance == DMA2_Channel3)
    {
      /*Reset request selection for DMA2 Channel3*/
      DMA2_CSELR->CSELR &= ~DMA_CSELR_C3S;

      /* Configure request selection for DMA2 Channel3 */
      DMA2_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 8);
    }
    else if (hdma->Instance == DMA2_Channel4)
    {
      /*Reset request selection for DMA2 Channel4*/
      DMA2_CSELR->CSELR &= ~DMA_CSELR_C4S;

      /* Configure request selection for DMA2 Channel4 */
      DMA2_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 12);
    }
    else if (hdma->Instance == DMA2_Channel5)
    {
      /*Reset request selection for DMA2 Channel5*/
      DMA2_CSELR->CSELR &= ~DMA_CSELR_C5S;

      /* Configure request selection for DMA2 Channel5 */
      DMA2_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 16);
    }
    else if (hdma->Instance == DMA2_Channel6)
    {
      /*Reset request selection for DMA2 Channel6*/
      DMA2_CSELR->CSELR &= ~DMA_CSELR_C6S;

      /* Configure request selection for DMA2 Channel6 */
      DMA2_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 20);
    }
    else if (hdma->Instance == DMA2_Channel7)
    {
      /*Reset request selection for DMA2 Channel7*/
      DMA2_CSELR->CSELR &= ~DMA_CSELR_C7S;

      /* Configure request selection for DMA2 Channel7 */
      DMA2_CSELR->CSELR |= (uint32_t) (hdma->Init.Request << 24);
    }
  }

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

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

  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));

  /* Check the DMA peripheral state */
  if(hdma->State == HAL_DMA_STATE_BUSY)
  {
     return HAL_ERROR;
  }

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

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

  /* Reset DMA Channel Number of Data to Transfer register */
  hdma->Instance->CNDTR = 0;

  /* Reset DMA Channel peripheral address register */
  hdma->Instance->CPAR  = 0;

  /* Reset DMA Channel memory address register */
  hdma->Instance->CMAR = 0;

  /* Clear all flags */
  __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_GI_FLAG_INDEX(hdma));
  __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_TC_FLAG_INDEX(hdma));
  __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_TE_FLAG_INDEX(hdma));
  __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_HT_FLAG_INDEX(hdma));

  /* Reset DMA channel selection register */
  if (hdma->Instance == DMA1_Channel1)
  {
    /*Reset DMA request*/
    DMA1_CSELR->CSELR &= ~DMA_CSELR_C1S;
  }
  else if (hdma->Instance == DMA1_Channel2)
  {
    /*Reset DMA request*/
    DMA1_CSELR->CSELR &= ~DMA_CSELR_C2S;
  }
  else if (hdma->Instance == DMA1_Channel3)
  {
    /*Reset DMA request*/
    DMA1_CSELR->CSELR &= ~DMA_CSELR_C3S;
  }
  else if (hdma->Instance == DMA1_Channel4)
  {
    /*Reset DMA request*/
    DMA1_CSELR->CSELR &= ~DMA_CSELR_C4S;
  }
  else if (hdma->Instance == DMA1_Channel5)
  {
    /*Reset DMA request*/
    DMA1_CSELR->CSELR &= ~DMA_CSELR_C5S;
  }
  else if (hdma->Instance == DMA1_Channel6)
  {
    /*Reset DMA request*/
    DMA1_CSELR->CSELR &= ~DMA_CSELR_C6S;
  }
  else if (hdma->Instance == DMA1_Channel7)
  {
    /*Reset DMA request*/
    DMA1_CSELR->CSELR &= ~DMA_CSELR_C7S;
  }
  else if (hdma->Instance == DMA2_Channel1)
  {
    /*Reset DMA request*/
    DMA2_CSELR->CSELR &= ~DMA_CSELR_C1S;
  }
  else if (hdma->Instance == DMA2_Channel2)
  {
    /*Reset DMA request*/
    DMA2_CSELR->CSELR &= ~DMA_CSELR_C2S;
  }
  else if (hdma->Instance == DMA2_Channel3)
  {
    /*Reset DMA request*/
    DMA2_CSELR->CSELR &= ~DMA_CSELR_C3S;
  }
  else if (hdma->Instance == DMA2_Channel4)
  {
    /*Reset DMA request*/
    DMA2_CSELR->CSELR &= ~DMA_CSELR_C4S;
  }
  else if (hdma->Instance == DMA2_Channel5)
  {
    /*Reset DMA request*/
    DMA2_CSELR->CSELR &= ~DMA_CSELR_C5S;
  }
  else if (hdma->Instance == DMA2_Channel6)
  {
    /*Reset DMA request*/
    DMA2_CSELR->CSELR &= ~DMA_CSELR_C6S;
  }
  else if (hdma->Instance == DMA2_Channel7)
  {
    /*Reset DMA request*/
    DMA2_CSELR->CSELR &= ~DMA_CSELR_C7S;
  }

  /* 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  Starts 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)
{
  /* Process locked */
  __HAL_LOCK(hdma);

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

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

  /* Disable the peripheral */
  __HAL_DMA_DISABLE(hdma);

  /* Configure the source, destination address and the data length */
  DMA_SetConfig(hdma, SrcAddress, DstAddress, DataLength);

  /* Enable the Peripheral */
  __HAL_DMA_ENABLE(hdma);

  return HAL_OK;
}

/**
  * @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)
{
  /* Process locked */
  __HAL_LOCK(hdma);

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

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

  /* Disable the peripheral */
  __HAL_DMA_DISABLE(hdma);

  /* Configure the source, destination address and the data length */
  DMA_SetConfig(hdma, SrcAddress, DstAddress, DataLength);

  /* Enable the transfer complete interrupt */
  /* Enable the Half transfer complete interrupt */
  /* Enable the transfer Error interrupt */
  __HAL_DMA_ENABLE_IT(hdma, (DMA_IT_TC | DMA_IT_HT | DMA_IT_TE));

   /* Enable the Peripheral */
  __HAL_DMA_ENABLE(hdma);

  return HAL_OK;
}

/**
  * @brief  Aborts the DMA Transfer.
  * @param  hdma: pointer to a DMA_HandleTypeDef structure that contains
  *               the configuration information for the specified DMA Channel.
  *                   
  * @note  After disabling a DMA Channel, a check for wait until the DMA Channel is 
  *        effectively disabled is added. If a Channel is disabled 
  *        while a data transfer is ongoing, the current data will be transferred
  *        and the Channel will be effectively disabled only after the transfer of
  *        this single data is finished.  
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_DMA_Abort(DMA_HandleTypeDef *hdma)
{
  uint32_t tickstart = 0;

  /* Disable the channel */
  __HAL_DMA_DISABLE(hdma);

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

  /* Check if the DMA Channel is effectively disabled */
  while((hdma->Instance->CCR & DMA_CCR_EN) != 0)
  {
    /* Check for the Timeout */
    if((HAL_GetTick() - tickstart) > HAL_TIMEOUT_DMA_ABORT)
    {
      /* Update error code */
      hdma->ErrorCode |= HAL_DMA_ERROR_TIMEOUT;

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

      /* Process Unlocked */
      __HAL_UNLOCK(hdma);

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

/**
  * @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;

  /* Get the level transfer complete flag */
  if(CompleteLevel == HAL_DMA_FULL_TRANSFER)
  {
    /* Transfer Complete flag */
    temp = __HAL_DMA_GET_TC_FLAG_INDEX(hdma);
  }
  else
  {
    /* Half Transfer Complete flag */
    temp = __HAL_DMA_GET_HT_FLAG_INDEX(hdma);
  }

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

  while(__HAL_DMA_GET_FLAG(hdma, temp) == RESET)
  {
    if((__HAL_DMA_GET_FLAG(hdma, __HAL_DMA_GET_TE_FLAG_INDEX(hdma)) != RESET))
    {
      /* Clear the transfer error flags */
      __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_TE_FLAG_INDEX(hdma));

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

      /* 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_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hdma);

        return HAL_TIMEOUT;
      }
    }
  }

  if(CompleteLevel == HAL_DMA_FULL_TRANSFER)
  {
    /* Clear the transfer complete flag */
    __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_TC_FLAG_INDEX(hdma));

    /* 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 */
    __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_HT_FLAG_INDEX(hdma));

    hdma->State = HAL_DMA_STATE_READY_HALF;
  }
  
  /* Process unlocked */
  __HAL_UNLOCK(hdma);  

  return HAL_OK;
}

/**
  * @brief  Handles 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)
{
  /* Transfer Error Interrupt management ***************************************/
  if(__HAL_DMA_GET_FLAG(hdma, __HAL_DMA_GET_TE_FLAG_INDEX(hdma)) != RESET)
  {
    if(__HAL_DMA_GET_IT_SOURCE(hdma, DMA_IT_TE) != RESET)
    {
      /* Disable the transfer error interrupt */
      __HAL_DMA_DISABLE_IT(hdma, DMA_IT_TE);

      /* Clear the transfer error flag */
      __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_TE_FLAG_INDEX(hdma));

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

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

      /* Process Unlocked */
      __HAL_UNLOCK(hdma);

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

  /* Half Transfer Complete Interrupt management ******************************/
  if(__HAL_DMA_GET_FLAG(hdma, __HAL_DMA_GET_HT_FLAG_INDEX(hdma)) != RESET)
  {
    if(__HAL_DMA_GET_IT_SOURCE(hdma, DMA_IT_HT) != RESET)
    {
      /* 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 */
      __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_HT_FLAG_INDEX(hdma));

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

      if(hdma->XferHalfCpltCallback != NULL)
      {
        /* Half transfer callback */
        hdma->XferHalfCpltCallback(hdma);
      }
    }
  }

  /* Transfer Complete Interrupt management ***********************************/
  if(__HAL_DMA_GET_FLAG(hdma, __HAL_DMA_GET_TC_FLAG_INDEX(hdma)) != RESET)
  {
    if(__HAL_DMA_GET_IT_SOURCE(hdma, DMA_IT_TC) != RESET)
    {
      if((hdma->Instance->CCR & DMA_CCR_CIRC) == 0)
      {
        /* Disable the transfer complete interrupt */
        __HAL_DMA_DISABLE_IT(hdma, DMA_IT_TC);
      }
      /* Clear the transfer complete flag */
      __HAL_DMA_CLEAR_FLAG(hdma, __HAL_DMA_GET_TC_FLAG_INDEX(hdma));

      /* Update error code */
      hdma->ErrorCode |= HAL_DMA_ERROR_NONE;

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

      /* Process Unlocked */
      __HAL_UNLOCK(hdma);

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

/**
  * @}
  */

/** @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  Returns 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)
{
  /* 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****/
