text: /**
    ******************************************************************************
    * @file    stm32f0xx_hal_dma.c
    * @author  MCD Application Team
    * @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 Reference manual for connection between peripherals
         and DMA requests .
  
     (#) For a given Channel, program the required configuration through the following parameters:   
         Transfer Direction, Source and Destination data formats, 
         Circular or Normal mode, Channel Priority level, Source and Destination Increment mode, 
         using HAL_DMA_Init() function.
  
     (#) 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_Channel_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.
  
       [..] 
        (@) You can refer to the DMA HAL driver header file for more useful macros  
  
    @endverbatim
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
    * All rights reserved.</center></h2>
    *
    * This software component is licensed by ST under BSD 3-Clause license,
    * the "License"; You may not use this file except in compliance with the
    * License. You may obtain a copy of the License at:
    *                        opensource.org/licenses/BSD-3-Clause
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f0xx_hal.h"
  
  /** @addtogroup STM32F0xx_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);
  static void DMA_CalcBaseAndBitshift(DMA_HandleTypeDef *hdma);
  /**
    * @}
    */
  
  /* 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 = 0U;
    
    /* Check the DMA handle allocation */
    if(NULL == hdma)
    {
      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));
    
    /* 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;  
    
    /* Initialize DmaBaseAddress and ChannelIndex parameters used 
       by HAL_DMA_IRQHandler() and HAL_DMA_PollForTransfer() */
    DMA_CalcBaseAndBitshift(hdma);
    
    /* 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(NULL == hdma)
    {
      return HAL_ERROR;
    }
    
    /* Check the parameters */
    assert_param(IS_DMA_ALL_INSTANCE(hdma->Instance));
  
    /* Disable the selected DMA Channelx */
    hdma->Instance->CCR &= ~DMA_CCR_EN;
  
    /* Reset DMA Channel control register */
    hdma->Instance->CCR  = 0U;
  
    /* Reset DMA Channel Number of Data to Transfer register */
    hdma->Instance->CNDTR = 0U;
  
    /* Reset DMA Channel peripheral address register */
    hdma->Instance->CPAR  = 0U;
    
    /* Reset DMA Channel memory address register */
    hdma->Instance->CMAR = 0U;
  
  /* Get DMA Base Address */  
    DMA_CalcBaseAndBitshift(hdma);
  
    /* Clear all flags */
    hdma->DmaBaseAddress->IFCR = DMA_FLAG_GL1 << hdma->ChannelIndex;
  
    /* Clean callbacks */
    hdma->XferCpltCallback = NULL;
    hdma->XferHalfCpltCallback = NULL;
    hdma->XferErrorCallback = NULL;
    hdma->XferAbortCallback = NULL;
  
    /* Reset the error code */
    hdma->ErrorCode = HAL_DMA_ERROR_NONE;
  
    /* Reset 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   I/O 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 */
    	hdma->Instance->CCR &= ~DMA_CCR_EN;  
    	
    	/* Configure the source, destination address and the data length */
    	DMA_SetConfig(hdma, SrcAddress, DstAddress, DataLength);
    	
    	/* Enable the Peripheral */
    	hdma->Instance->CCR |= DMA_CCR_EN;  
    }
    else
    {
    	/* Process Unlocked */
    	__HAL_UNLOCK(hdma);
    	
    	/* Remain BUSY */
    	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 */
    	hdma->Instance->CCR &= ~DMA_CCR_EN;
    	
    	/* Configure the source, destination address and the data length */  
    	DMA_SetConfig(hdma, SrcAddress, DstAddress, DataLength);
    	
    	/* Enable the transfer complete, & transfer error interrupts */
    	/* Half transfer interrupt is optional: enable it only if associated callback is available */
      if(NULL != hdma->XferHalfCpltCallback )
      {
        hdma->Instance->CCR |= (DMA_IT_TC | DMA_IT_HT | DMA_IT_TE);
      }
    	else
    	{
    		hdma->Instance->CCR |= (DMA_IT_TC | DMA_IT_TE);
    		hdma->Instance->CCR &= ~DMA_IT_HT;
    	}
    	
    	/* Enable the Peripheral */
    	hdma->Instance->CCR |= DMA_CCR_EN;
    }
    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)
  {
    if(hdma->State != HAL_DMA_STATE_BUSY)
    {
      /* no transfer ongoing */
      hdma->ErrorCode = HAL_DMA_ERROR_NO_XFER;
      
      /* Process Unlocked */
      __HAL_UNLOCK(hdma);
      
      return HAL_ERROR;
    }
    else
    {
      /* Disable DMA IT */
      hdma->Instance->CCR &= ~(DMA_IT_TC | DMA_IT_HT | DMA_IT_TE);
      
      /* Disable the channel */
      hdma->Instance->CCR &= ~DMA_CCR_EN;
      
      /* Clear all flags */
      hdma->DmaBaseAddress->IFCR = (DMA_FLAG_GL1 << hdma->ChannelIndex);
    }
    /* Change the DMA state*/
    hdma->State = HAL_DMA_STATE_READY; 
    
    /* Process Unlocked */
    __HAL_UNLOCK(hdma);
    
    return HAL_OK;
  }
  
  /**
    * @brief  Abort the DMA Transfer in Interrupt mode.
    * @param  hdma  pointer to a DMA_HandleTypeDef structure that contains
    *               the configuration information for the specified DMA Stream.
    * @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 */
      hdma->Instance->CCR &= ~(DMA_IT_TC | DMA_IT_HT | DMA_IT_TE);
      
      /* Disable the channel */
      hdma->Instance->CCR &= ~DMA_CCR_EN;
      
      /* Clear all flags */
      hdma->DmaBaseAddress->IFCR = DMA_FLAG_GL1 << 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 = 0U;
    
    if(HAL_DMA_STATE_BUSY != hdma->State)
    {
      /* no transfer ongoing */
      hdma->ErrorCode = HAL_DMA_ERROR_NO_XFER;
      __HAL_UNLOCK(hdma);
      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_FLAG_GL1 << 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 == 0U) || ((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) == 0U)
    	{
    		/* Disable the half transfer interrupt */
    		hdma->Instance->CCR &= ~DMA_IT_HT;
    	}
    	
    	/* Clear the half transfer complete flag */
    	hdma->DmaBaseAddress->IFCR = DMA_FLAG_HT1 << hdma->ChannelIndex;
    	
    	/* DMA peripheral state is not updated in Half Transfer */
    	/* State is updated only 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) == 0U)
    	{
    		/* Disable the transfer complete  & transfer error interrupts */
    		/* if the DMA mode is not CIRCULAR */
    		hdma->Instance->CCR &= ~(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_FLAG_TC1 << 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 */
      /* Then, disable all DMA interrupts */
      hdma->Instance->CCR &= ~(DMA_IT_TC | DMA_IT_HT | DMA_IT_TE);
      
      /* Clear all flags */
      hdma->DmaBaseAddress->IFCR = DMA_FLAG_GL1 << 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);
      }
     }
  }  
  
  /**
    * @brief  Register callbacks
    * @param  hdma                 pointer to a DMA_HandleTypeDef structure that contains
    *                               the configuration information for the specified DMA Stream.
    * @param  CallbackID           User Callback identifer
    *                               a HAL_DMA_CallbackIDTypeDef ENUM as parameter.
    * @param  pCallback            pointer to private callback 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 Stream.
    * @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 functions
   *  @brief    Peripheral State functions 
   *
  @verbatim   
   ===============================================================================
                      ##### State and Errors functions #####
   ===============================================================================  
      [..]
      This subsection provides functions allowing to
        (+) Check the DMA state
        (+) Get error code
  
  @endverbatim
    * @{
    */  
  
  /**
    * @brief  Returns the DMA 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 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  Set the DMA Transfer parameters.
    * @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_FLAG_GL1 << hdma->ChannelIndex);
    
    /* Configure DMA Channel data length */
    hdma->Instance->CNDTR = DataLength;
    
    /* Memory to Peripheral */
    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;
    }
    /* Peripheral to Memory */
    else
    {
      /* Configure DMA Channel source address */
      hdma->Instance->CPAR = SrcAddress;
      
      /* Configure DMA Channel destination address */
      hdma->Instance->CMAR = DstAddress;
    }
  }
  
  /**
    * @brief  set the DMA base address and channel index depending on DMA instance
    * @param  hdma       pointer to a DMA_HandleTypeDef structure that contains
    *                     the configuration information for the specified DMA Stream. 
    * @retval None
    */
  static void DMA_CalcBaseAndBitshift(DMA_HandleTypeDef *hdma)
  {
  #if defined (DMA2)
    /* 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)) << 2U;
      hdma->DmaBaseAddress = DMA1;
    }
    else 
    {
      /* DMA2 */
      hdma->ChannelIndex = (((uint32_t)hdma->Instance - (uint32_t)DMA2_Channel1) / ((uint32_t)DMA2_Channel2 - (uint32_t)DMA2_Channel1)) << 2U;
      hdma->DmaBaseAddress = DMA2;
    }
  #else
    /* calculation of the channel index */
    /* DMA1 */
    hdma->ChannelIndex = (((uint32_t)hdma->Instance - (uint32_t)DMA1_Channel1) / ((uint32_t)DMA1_Channel2 - (uint32_t)DMA1_Channel1)) << 2U;
    hdma->DmaBaseAddress = DMA1;
  #endif
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  #endif /* HAL_DMA_MODULE_ENABLED */
  
  /**
    * @}
    */
    
    /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  