stm32f769i_eval_audio.c

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/**
  ******************************************************************************
  * @file    stm32f769i_eval_audio.c
  * @author  MCD Application Team
  * @version V2.0.1
  * @date    06-April-2017
  * @brief   This file provides the Audio driver for the STM32F769I-EVAL  
  *          evaluation board.
  @verbatim
  How To use this driver:
  -----------------------
   + This driver supports STM32F7xx devices on STM32F769I-EVAL (MB1219) Evaluation boards.
   + Call the function BSP_AUDIO_OUT_Init(
                                    OutputDevice: physical output mode (OUTPUT_DEVICE_SPEAKER, 
                                                  OUTPUT_DEVICE_HEADPHONE or OUTPUT_DEVICE_BOTH)
                                    Volume      : Initial volume to be set (0 is min (mute), 100 is max (100%)
                                    AudioFreq   : Audio frequency in Hz (8000, 16000, 22500, 32000...)
                                                  this parameter is relative to the audio file/stream type.
                                   )
      This function configures all the hardware required for the audio application (codec, I2C, SAI, 
      GPIOs, DMA and interrupt if needed). This function returns AUDIO_OK if configuration is OK.
      If the returned value is different from AUDIO_OK or the function is stuck then the communication with
      the codec or the MFX has failed (try to un-plug the power or reset device in this case).
      - OUTPUT_DEVICE_SPEAKER  : only speaker will be set as output for the audio stream.
      - OUTPUT_DEVICE_HEADPHONE: only headphones will be set as output for the audio stream.
      - OUTPUT_DEVICE_BOTH     : both Speaker and Headphone are used as outputs for the audio stream
                                 at the same time.
      Note. On STM32F769I-EVAL SAI_DMA is configured in CIRCULAR mode. Due to this the application
        does NOT need to call BSP_AUDIO_OUT_ChangeBuffer() to assure streaming.
   + Call the function BSP_EVAL_AUDIO_OUT_Play(
                                  pBuffer: pointer to the audio data file address
                                  Size   : size of the buffer to be sent in Bytes
                                 )
      to start playing (for the first time) from the audio file/stream.
   + Call the function BSP_AUDIO_OUT_Pause() to pause playing   
   + Call the function BSP_AUDIO_OUT_Resume() to resume playing.
       Note. After calling BSP_AUDIO_OUT_Pause() function for pause, only BSP_AUDIO_OUT_Resume() should be called
          for resume (it is not allowed to call BSP_AUDIO_OUT_Play() in this case).
       Note. This function should be called only when the audio file is played or paused (not stopped).
   + For each mode, you may need to implement the relative callback functions into your code.
      The Callback functions are named AUDIO_OUT_XXX_CallBack() and only their prototypes are declared in 
      the stm32f769i_eval_audio.h file. (refer to the example for more details on the callbacks implementations)
   + To Stop playing, to modify the volume level, the frequency, the audio frame slot, 
      the device output mode the mute or the stop, use the functions: BSP_AUDIO_OUT_SetVolume(), 
      AUDIO_OUT_SetFrequency(), BSP_AUDIO_OUT_SetAudioFrameSlot(), BSP_AUDIO_OUT_SetOutputMode(),
      BSP_AUDIO_OUT_SetMute() and BSP_AUDIO_OUT_Stop().
   + The driver API and the callback functions are at the end of the stm32f769i_eval_audio.h file.
 
  Driver architecture:
  --------------------
   + This driver provides the High Audio Layer: consists of the function API exported in the stm32f769i_eval_audio.h file
     (BSP_AUDIO_OUT_Init(), BSP_AUDIO_OUT_Play() ...)
   + This driver provide also the Media Access Layer (MAL): which consists of functions allowing to access the media containing/
     providing the audio file/stream. These functions are also included as local functions into
     the stm32f769i_eval_audio_codec.c file (DFSDMx_Init(), DFSDMx_DeInit(), SAIx_Init() and SAIx_DeInit())

  Known Limitations:
  ------------------
   1- If the TDM Format used to play in parallel 2 audio Stream (the first Stream is configured in codec SLOT0 and second 
      Stream in SLOT1) the Pause/Resume, volume and mute feature will control the both streams.
   2- Parsing of audio file is not implemented (in order to determine audio file properties: Mono/Stereo, Data size, 
      File size, Audio Frequency, Audio Data header size ...). The configuration is fixed for the given audio file.
   3- Supports only Stereo audio streaming.
   4- Supports only 16-bits audio data size.
  @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.
  *
  ******************************************************************************
  */

/* Dependencies
- stm32f769i_eval.c
- stm32f7xx_hal_sai.c
- stm32f7xx_hal_dfsdm.c
- stm32f7xx_hal_dma.c
- stm32f7xx_hal_gpio.c
- stm32f7xx_hal_cortex.c
- stm32f7xx_hal_rcc_ex.h
- wm8994.c
- adv7533.c
EndDependencies */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f769i_eval_audio.h"

/** @addtogroup BSP
  * @{
  */

/** @addtogroup STM32F769I_EVAL
  * @{
  */ 
  
/** @defgroup STM32F769I_EVAL_AUDIO STM32F769I_EVAL AUDIO
  * @brief This file includes the low layer driver for wm8994 Audio Codec
  *        available on STM32F769I-EVAL evaluation board(MB1219).
  * @{
  */ 

/** @defgroup STM32F769I_EVAL_AUDIO_Private_Types STM32F769I_EVAL_AUDIO Private Types
  * @{
  */ 
typedef struct
{
  uint16_t      *pRecBuf;       /* Pointer to record user buffer */
  uint32_t      RecSize;        /* Size to record in mono, double size to record in stereo */
}AUDIOIN_TypeDef;

/**
  * @}
  */ 
  
/** @defgroup STM32F769I_EVAL_AUDIO_Private_Defines STM32F769I_EVAL_AUDIO Private Defines
  * @{
  */
/**
  * @}
  */ 

/** @defgroup STM32F769I_EVAL_AUDIO_Private_Macros STM32F769I_EVAL_AUDIO Private Macros
  * @{
  */
/*### RECORD ###*/
#define DFSDM_OVER_SAMPLING(__FREQUENCY__) \
        (__FREQUENCY__ == AUDIO_FREQUENCY_8K)  ? 256 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_11K) ? 256 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_16K) ? 128 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_22K) ? 128 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_32K) ? 64 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_44K) ? 64  \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_48K) ? 40 : 20  \

#define DFSDM_CLOCK_DIVIDER(__FREQUENCY__) \
        (__FREQUENCY__ == AUDIO_FREQUENCY_8K)  ? 24 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_11K) ? 4 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_16K) ? 24 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_22K) ? 4 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_32K) ? 24 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_44K) ? 4  \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_48K) ? 25 : 25  \

#define DFSDM_FILTER_ORDER(__FREQUENCY__) \
        (__FREQUENCY__ == AUDIO_FREQUENCY_8K)  ? DFSDM_FILTER_SINC3_ORDER \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_11K) ? DFSDM_FILTER_SINC3_ORDER \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_16K) ? DFSDM_FILTER_SINC3_ORDER \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_22K) ? DFSDM_FILTER_SINC3_ORDER \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_32K) ? DFSDM_FILTER_SINC4_ORDER \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_44K) ? DFSDM_FILTER_SINC3_ORDER  \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_48K) ? DFSDM_FILTER_SINC3_ORDER : DFSDM_FILTER_SINC5_ORDER  \

#define DFSDM_RIGHT_BIT_SHIFT(__FREQUENCY__) \
        (__FREQUENCY__ == AUDIO_FREQUENCY_8K)  ? 8 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_11K) ? 8 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_16K) ? 3 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_22K) ? 4 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_32K) ? 7 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_44K) ? 0  \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_48K) ? 0 : 4  \

/* Saturate the record PCM sample */
#define SaturaLH(N, L, H) (((N)<(L))?(L):(((N)>(H))?(H):(N)))
/**
  * @}
  */ 
  
/** @defgroup STM32F769I_EVAL_AUDIO_Private_Variables STM32F769I_EVAL_AUDIO Private Variables
  * @{
  */
/*### PLAY ###*/
AUDIO_DrvTypeDef          *audio_drv;
SAI_HandleTypeDef         haudio_out_sai;

/*### RECORD ###*/
AUDIOIN_TypeDef                 hAudioIn;

DFSDM_Channel_HandleTypeDef     haudio_in_dfsdm_leftchannel;
DFSDM_Channel_HandleTypeDef     haudio_in_dfsdm_rightchannel;
DFSDM_Filter_HandleTypeDef      haudio_in_dfsdm_leftfilter;
DFSDM_Filter_HandleTypeDef      haudio_in_dfsdm_rightfilter;
DMA_HandleTypeDef               hdma_dfsdm_left;
DMA_HandleTypeDef               hdma_dfsdm_right;

/* Buffers for right and left samples */
int32_t                         *pScratchBuff[DEFAULT_AUDIO_IN_CHANNEL_NBR];
int32_t                         ScratchSize;

/* Output device to be used: headphone by default */
static uint16_t                 AudioOut_Device = OUTPUT_DEVICE_HEADPHONE1; 

/* Buffers status flags */
uint32_t                        DmaLeftRecHalfBuffCplt  = 0;
uint32_t                        DmaLeftRecBuffCplt      = 0;
uint32_t                        DmaRightRecHalfBuffCplt = 0;
uint32_t                        DmaRightRecBuffCplt     = 0;

/* Application Buffer Trigger */
__IO uint32_t                   AppBuffTrigger          = 0;
__IO uint32_t                   AppBuffHalf             = 0;

#if defined(USE_LCD_HDMI)
AUDIO_DrvTypeDef          *hdmi_drv;
/* Audio device ID */
static uint32_t                 DeviceId = 0x00;
#endif /* USE_LCD_HDMI */

/**
  * @}
  */ 

/** @defgroup STM32F769I_EVAL_AUDIO_Private_Function_Prototypes STM32F769I_EVAL_AUDIO Private Function Prototypes
  * @{
  */
static void SAIx_Init(uint32_t AudioFreq);
static void SAIx_DeInit(void);
static void    DFSDMx_ChannelMspInit(void);
static void    DFSDMx_FilterMspInit(void);
static void    DFSDMx_ChannelMspDeInit(void);
static void    DFSDMx_FilterMspDeInit(void);
static uint8_t DFSDMx_Init(uint32_t AudioFreq);
static uint8_t DFSDMx_DeInit(void);
/**
  * @}
  */ 

/** @defgroup STM32F769I_EVAL_AUDIO_OUT_Private_Functions STM32F769I_EVAL_AUDIO_OUT Private Functions
  * @{
  */ 

/**
  * @brief  Configure the audio peripherals.
  * @param  OutputDevice: OUTPUT_DEVICE_SPEAKER, OUTPUT_DEVICE_HEADPHONE,
  *                       or OUTPUT_DEVICE_BOTH.
  * @param  Volume: Initial volume level (from 0 (Mute) to 100 (Max))
  * @param  AudioFreq: Audio frequency used to play the audio stream.  
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_Init(uint16_t OutputDevice, uint8_t Volume, uint32_t AudioFreq)
{ 
  uint8_t ret = AUDIO_ERROR;
  AudioOut_Device = OutputDevice;

  /* Disable SAI */
  SAIx_DeInit();

  /* PLL clock is set depending by the AudioFreq (44.1khz vs 48khz groups) */ 
  BSP_AUDIO_OUT_ClockConfig(&haudio_out_sai, AudioFreq, NULL);
 
  /* SAI data transfer preparation:
  Prepare the Media to be used for the audio transfer from memory to SAI peripheral */
  haudio_out_sai.Instance = AUDIO_SAIx;
  if(HAL_SAI_GetState(&haudio_out_sai) == HAL_SAI_STATE_RESET)
  {
    /* Init the SAI MSP: this __weak function can be redefined by the application*/
    BSP_AUDIO_OUT_MspInit(&haudio_out_sai, NULL);
  }
  SAIx_Init(AudioFreq);

#if defined(USE_LCD_HDMI)
  if((OutputDevice & OUTPUT_DEVICE_HDMI) == OUTPUT_DEVICE_HDMI)
  {
    /* adv7533 audio driver initialization */
    DeviceId = adv7533_drv.ReadID(ADV7533_CEC_DSI_I2C_ADDR);

    if(DeviceId == ADV7533_ID)
    { 
      /* Initialize the audio driver structure */
      hdmi_drv = &adv7533_drv; 
      ret = AUDIO_OK;
    }
    else
    {
      ret = AUDIO_ERROR;
    }

    if(ret == AUDIO_OK)
    {
      /* Initialize the codec internal registers */
      hdmi_drv->Init(ADV7533_MAIN_I2C_ADDR, OutputDevice, Volume, AudioFreq);
    }    
  }
#endif /* USE_LCD_HDMI */

  if((((OutputDevice & OUTPUT_DEVICE_BOTH) > 0) && 
     ((OutputDevice & OUTPUT_DEVICE_BOTH) <= OUTPUT_DEVICE_BOTH)) ||
     ((OutputDevice & OUTPUT_DEVICE_AUTO) == OUTPUT_DEVICE_AUTO))
  {    
    /* wm8994 codec initialization */   
    if((wm8994_drv.ReadID(AUDIO_I2C_ADDRESS)) == WM8994_ID)
    {  
      /* Reset the Codec Registers */
      wm8994_drv.Reset(AUDIO_I2C_ADDRESS);
      /* Initialize the audio driver structure */
      audio_drv = &wm8994_drv; 
      ret = AUDIO_OK;
    }
    else
    {
      ret = AUDIO_ERROR;
    }

    if(ret == AUDIO_OK)
    {
      /* Initialize the codec internal registers */
      audio_drv->Init(AUDIO_I2C_ADDRESS, OutputDevice, Volume, AudioFreq);
    }
  }
 
  return ret;
}

/**
  * @brief  Start playing audio stream from a data buffer for a determined size. 
  * @param  pBuffer: Pointer to the buffer 
  * @param  Size: Number of audio data BYTES.
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_Play(uint16_t* pBuffer, uint32_t Size)
{
  uint8_t ret = 0;
#if defined(USE_LCD_HDMI)  
  /* ADV7533 used */
  if((AudioOut_Device & OUTPUT_DEVICE_HDMI) == OUTPUT_DEVICE_HDMI)
  {
    if(DeviceId == ADV7533_ID)
    {
      /* Call the audio Codec Play function */
      if(hdmi_drv->Play(ADV7533_MAIN_I2C_ADDR, (uint16_t *)pBuffer, Size) != 0)
      {  
        ret = AUDIO_ERROR;
      }
    }
  }
#endif /* USE_LCD_HDMI */

  /* WM8994 used */
  if((((AudioOut_Device & OUTPUT_DEVICE_BOTH) > 0) && 
     ((AudioOut_Device & OUTPUT_DEVICE_BOTH) <= OUTPUT_DEVICE_BOTH)) ||
     ((AudioOut_Device & OUTPUT_DEVICE_AUTO) == OUTPUT_DEVICE_AUTO))
  {  
    /* Call the audio Codec Play function */
    if(audio_drv->Play(AUDIO_I2C_ADDRESS, (uint16_t *)pBuffer, Size) != 0)
    {  
      ret = AUDIO_ERROR;
    } 
  }

  if(ret == AUDIO_ERROR)
  {
    return AUDIO_ERROR;
  }
  else
  {
    /* Update the Media layer and enable it for play */  
    HAL_SAI_Transmit_DMA(&haudio_out_sai, (uint8_t*) pBuffer, DMA_MAX(Size / AUDIODATA_SIZE));
    
    return AUDIO_OK;
  }
}

/**
  * @brief  Send n-Bytes on the SAI interface.
  * @param  pData: pointer on data address 
  * @param  Size: number of data to be written
  * @retval None
  */
void BSP_AUDIO_OUT_ChangeBuffer(uint16_t *pData, uint16_t Size)
{
   HAL_SAI_Transmit_DMA(&haudio_out_sai, (uint8_t*) pData, Size);
}

/**
  * @brief  Pause the audio file stream. In case
  *         of using DMA, the DMA Pause feature is used.
  * @note  When calling BSP_AUDIO_OUT_Pause() function for pause, only
  *          BSP_AUDIO_OUT_Resume() function should be called for resume (use of BSP_AUDIO_OUT_Play() 
  *          function for resume could lead to unexpected behaviour).
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_Pause(void)
{
  uint8_t ret = 0;
#if defined(USE_LCD_HDMI)  
  /* ADV7533 used */
  if((AudioOut_Device & OUTPUT_DEVICE_HDMI) == OUTPUT_DEVICE_HDMI)
  {
    if(DeviceId == ADV7533_ID)
    {    
      /* Call the audio Codec Pause function */
      if(hdmi_drv->Pause(ADV7533_MAIN_I2C_ADDR) != 0)
      {  
        ret = AUDIO_ERROR;
      }
    }
  }
#endif /* USE_LCD_HDMI */

  /* WM8994 used */
  if((((AudioOut_Device & OUTPUT_DEVICE_BOTH) > 0) && 
     ((AudioOut_Device & OUTPUT_DEVICE_BOTH) <= OUTPUT_DEVICE_BOTH)) ||
     ((AudioOut_Device & OUTPUT_DEVICE_AUTO) == OUTPUT_DEVICE_AUTO))
  {  
    /* Call the audio Codec Pause function */
    if(audio_drv->Pause(AUDIO_I2C_ADDRESS) != 0)
    {  
      ret = AUDIO_ERROR;
    } 
  }

  if(ret == AUDIO_ERROR)
  {
    return AUDIO_ERROR;
  }
  else
  {
    /* Call the Media layer pause function */
    HAL_SAI_DMAPause(&haudio_out_sai);
    
    /* Return AUDIO_OK when all operations are correctly done */
    return AUDIO_OK;
  }
}

/**
  * @brief  Resume the audio file stream.  
  * @note   When calling BSP_AUDIO_OUT_Pause() function for pause, only
  *          BSP_AUDIO_OUT_Resume() function should be called for resume (use of BSP_AUDIO_OUT_Play() 
  *          function for resume could lead to unexpected behaviour).
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_Resume(void)
{
  uint8_t ret = 0;
#if defined(USE_LCD_HDMI)  
  /* ADV7533 used */
  if((AudioOut_Device & OUTPUT_DEVICE_HDMI) == OUTPUT_DEVICE_HDMI)
  {
    if(DeviceId == ADV7533_ID)
    {    
      /* Call the audio Codec Resume function */
      if(hdmi_drv->Resume(ADV7533_MAIN_I2C_ADDR) != 0)
      {  
        ret = AUDIO_ERROR;
      }
    }
  }
#endif /* USE_LCD_HDMI */

  /* WM8994 used */
  if((((AudioOut_Device & OUTPUT_DEVICE_BOTH) > 0) && 
     ((AudioOut_Device & OUTPUT_DEVICE_BOTH) <= OUTPUT_DEVICE_BOTH)) ||
     ((AudioOut_Device & OUTPUT_DEVICE_AUTO) == OUTPUT_DEVICE_AUTO))
  {  
    /* Call the audio Codec Resume function */
    if(audio_drv->Resume(AUDIO_I2C_ADDRESS) != 0)
    {  
      ret = AUDIO_ERROR;
    } 
  }

  if(ret == AUDIO_ERROR)
  {
    return AUDIO_ERROR;
  }
  else
  {
    /* Call the Media layer pause/resume function */
    HAL_SAI_DMAResume(&haudio_out_sai);
    
    /* Return AUDIO_OK when all operations are correctly done */
    return AUDIO_OK;
  }
}

/**
  * @brief  Stop audio playing and Power down the Audio Codec. 
  * @param  Option: could be one of the following parameters 
  *           - CODEC_PDWN_SW: for software power off (by writing registers). 
  *                            Then no need to reconfigure the Codec after power on.
  *           - CODEC_PDWN_HW: completely shut down the codec (physically). 
  *                            Then need to reconfigure the Codec after power on.  
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_Stop(uint32_t Option)
{
  uint8_t ret = 0;

  /* Call the Media layer stop function */
  HAL_SAI_DMAStop(&haudio_out_sai);

#if defined(USE_LCD_HDMI)
  /* ADV7533 used */
  if((AudioOut_Device & OUTPUT_DEVICE_HDMI) == OUTPUT_DEVICE_HDMI)
  {
    if(DeviceId == ADV7533_ID)
    {    
      /* Call the audio Codec Stop function */
      if(hdmi_drv->Stop(ADV7533_MAIN_I2C_ADDR, Option) != 0)
      {  
        ret = AUDIO_ERROR;
      }
    }
  }
#endif /* USE_LCD_HDMI */

  /* WM8994 used */
  if((((AudioOut_Device & OUTPUT_DEVICE_BOTH) > 0) && 
     ((AudioOut_Device & OUTPUT_DEVICE_BOTH) <= OUTPUT_DEVICE_BOTH)) ||
     ((AudioOut_Device & OUTPUT_DEVICE_AUTO) == OUTPUT_DEVICE_AUTO))
  {  
    /* Call the audio Codec Stop function */
    if(audio_drv->Stop(AUDIO_I2C_ADDRESS, Option) != 0)
    {  
      ret = AUDIO_ERROR;
    } 
  }
  
  if(ret == AUDIO_ERROR)
  {
    return AUDIO_ERROR;
  }
  else
  {
    if(Option == CODEC_PDWN_HW)
    { 
      /* Wait at least 100us */
      HAL_Delay(1);
    }
    /* Return AUDIO_OK when all operations are correctly done */
    return AUDIO_OK;
  }
}

/**
  * @brief  Control the current audio volume level. 
  * @param  Volume: Volume level to be set in percentage from 0% to 100% (0 for 
  *         Mute and 100 for Max volume level).
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_SetVolume(uint8_t Volume)
{
  /* Call the codec volume control function with converted volume value */
  if(audio_drv->SetVolume(AUDIO_I2C_ADDRESS, Volume) != 0)
  {
    return AUDIO_ERROR;
  }
  else
  {
    /* Return AUDIO_OK when all operations are correctly done */
    return AUDIO_OK;
  }
}

/**
  * @brief  Enable or disable the MUTE mode by software 
  * @param  Cmd: Could be AUDIO_MUTE_ON to mute sound or AUDIO_MUTE_OFF to 
  *         unmute the codec and restore previous volume level.
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_SetMute(uint32_t Cmd)
{
  uint8_t ret = 0;
#if defined(USE_LCD_HDMI)  
  /* ADV7533 used */
  if((AudioOut_Device & OUTPUT_DEVICE_HDMI) == OUTPUT_DEVICE_HDMI)
  {
    if(DeviceId == ADV7533_ID)
    {    
      /* Call the audio Codec SetMute function */
      if(hdmi_drv->SetMute(ADV7533_MAIN_I2C_ADDR, Cmd) != 0)
      {  
        ret = AUDIO_ERROR;
      }
    }
  }
#endif /* USE_LCD_HDMI */

  /* WM8994 used */
  if((((AudioOut_Device & OUTPUT_DEVICE_BOTH) > 0) && 
      ((AudioOut_Device & OUTPUT_DEVICE_BOTH) <= OUTPUT_DEVICE_BOTH)) ||
     ((AudioOut_Device & OUTPUT_DEVICE_AUTO) == OUTPUT_DEVICE_AUTO))
  {  
    /* Call the audio Codec SetMute function */
    if(audio_drv->SetMute(AUDIO_I2C_ADDRESS, Cmd) != 0)
    {  
      ret = AUDIO_ERROR;
    } 
  }
  
  if(ret == AUDIO_ERROR)
  {
    return AUDIO_ERROR;
  }
  else
  {
    /* Return AUDIO_OK when all operations are correctly done */
    return AUDIO_OK;
  }
}

/**
  * @brief  Switch dynamically (while audio file is played) the output target 
  *         (speaker or headphone).
  * @param  Output: The audio output target: OUTPUT_DEVICE_SPEAKER,
  *         OUTPUT_DEVICE_HEADPHONE or OUTPUT_DEVICE_BOTH
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_OUT_SetOutputMode(uint8_t Output)
{
  /* Call the Codec output device function */
  if(audio_drv->SetOutputMode(AUDIO_I2C_ADDRESS, Output) != 0)
  {
    return AUDIO_ERROR;
  }
  else
  {
    /* Return AUDIO_OK when all operations are correctly done */
    return AUDIO_OK;
  }
}

/**
  * @brief  Update the audio frequency.
  * @param  AudioFreq: Audio frequency used to play the audio stream.
  * @note   This API should be called after the BSP_AUDIO_OUT_Init() to adjust the
  *         audio frequency.
  * @retval None
  */
void BSP_AUDIO_OUT_SetFrequency(uint32_t AudioFreq)
{ 
  /* PLL clock is set depending by the AudioFreq (44.1khz vs 48khz groups) */ 
  BSP_AUDIO_OUT_ClockConfig(&haudio_out_sai, AudioFreq, NULL);

  /* Disable SAI peripheral to allow access to SAI internal registers */
  __HAL_SAI_DISABLE(&haudio_out_sai);
  
  /* Update the SAI audio frequency configuration */
  haudio_out_sai.Init.AudioFrequency = AudioFreq;
  HAL_SAI_Init(&haudio_out_sai);
  
  /* Enable SAI peripheral to generate MCLK */
  __HAL_SAI_ENABLE(&haudio_out_sai);
}

/**
  * @brief  Update the Audio frame slot configuration.
  * @param  AudioFrameSlot: specifies the audio Frame slot
  * @note   This API should be called after the BSP_AUDIO_OUT_Init() to adjust the
  *         audio frame slot.
  * @retval None
  */
void BSP_AUDIO_OUT_SetAudioFrameSlot(uint32_t AudioFrameSlot)
{ 
  /* Disable SAI peripheral to allow access to SAI internal registers */
  __HAL_SAI_DISABLE(&haudio_out_sai);
  
  /* Update the SAI audio frame slot configuration */
  haudio_out_sai.SlotInit.SlotActive = AudioFrameSlot;
  HAL_SAI_Init(&haudio_out_sai);
  
  /* Enable SAI peripheral to generate MCLK */
  __HAL_SAI_ENABLE(&haudio_out_sai);
}

                         
/**
  * @brief  De-initialize the audio peripherals.
  * @retval None
  */
void BSP_AUDIO_OUT_DeInit(void)
{
  SAIx_DeInit();
  /* DeInit the SAI MSP : this __weak function can be rewritten by the application */
  BSP_AUDIO_OUT_MspDeInit(&haudio_out_sai, NULL);
}

/**
  * @brief  Tx Transfer completed callbacks.
  * @param  hsai: SAI handle
  * @retval None
  */
void HAL_SAI_TxCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Manage the remaining file size and new address offset: This function 
     should be coded by user (its prototype is already declared in stm32f769i_eval_audio.h) */
  BSP_AUDIO_OUT_TransferComplete_CallBack();
}

/**
  * @brief  Tx Half Transfer completed callbacks.
  * @param  hsai: SAI handle
  * @retval None
  */
void HAL_SAI_TxHalfCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Manage the remaining file size and new address offset: This function 
     should be coded by user (its prototype is already declared in stm32f769i_eval_audio.h) */
  BSP_AUDIO_OUT_HalfTransfer_CallBack();
}

/**
  * @brief  SAI error callbacks.
  * @param  hsai: SAI handle
  * @retval None
  */
void HAL_SAI_ErrorCallback(SAI_HandleTypeDef *hsai)
{
  BSP_AUDIO_OUT_Error_CallBack();
}

/**
  * @brief  Manages the DMA full Transfer complete event.
  * @retval None
  */
__weak void BSP_AUDIO_OUT_TransferComplete_CallBack(void)
{
}

/**
  * @brief  Manages the DMA Half Transfer complete event.
  * @retval None
  */
__weak void BSP_AUDIO_OUT_HalfTransfer_CallBack(void)
{ 
}

/**
  * @brief  Manages the DMA FIFO error event.
  * @retval None
  */
__weak void BSP_AUDIO_OUT_Error_CallBack(void)
{
}

/**
  * @brief  Initialize BSP_AUDIO_OUT MSP.
  * @param  hsai: SAI handle
  * @param  Params  
  * @retval None
  */
__weak void BSP_AUDIO_OUT_MspInit(SAI_HandleTypeDef *hsai, void *Params)
{ 
  static DMA_HandleTypeDef hdma_sai_tx;
  GPIO_InitTypeDef  gpio_init_structure;  

  /* Enable SAI clock */
  AUDIO_SAIx_CLK_ENABLE();
  
  /* Enable GPIO clock */
  AUDIO_SAIx_MCLK_ENABLE();
  AUDIO_SAIx_SCK_SD_ENABLE();
  AUDIO_SAIx_FS_ENABLE();
  /* CODEC_SAI pins configuration: FS, SCK, MCK and SD pins ------------------*/
  gpio_init_structure.Pin = AUDIO_SAIx_FS_PIN;
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  gpio_init_structure.Alternate = AUDIO_SAIx_FS_SD_MCLK_AF;
  HAL_GPIO_Init(AUDIO_SAIx_FS_GPIO_PORT, &gpio_init_structure);

  gpio_init_structure.Pin = AUDIO_SAIx_SCK_PIN;
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  gpio_init_structure.Alternate = AUDIO_SAIx_SCK_AF;
  HAL_GPIO_Init(AUDIO_SAIx_SCK_SD_GPIO_PORT, &gpio_init_structure);

  gpio_init_structure.Pin =  AUDIO_SAIx_SD_PIN;
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  gpio_init_structure.Alternate = AUDIO_SAIx_FS_SD_MCLK_AF;
  HAL_GPIO_Init(AUDIO_SAIx_SCK_SD_GPIO_PORT, &gpio_init_structure);

  gpio_init_structure.Pin = AUDIO_SAIx_MCLK_PIN;
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  gpio_init_structure.Alternate = AUDIO_SAIx_FS_SD_MCLK_AF;
  HAL_GPIO_Init(AUDIO_SAIx_MCLK_GPIO_PORT, &gpio_init_structure);

  /* Enable the DMA clock */
  AUDIO_SAIx_DMAx_CLK_ENABLE();
    
  if(hsai->Instance == AUDIO_SAIx)
  {
    /* Configure the hdma_saiTx handle parameters */   
    hdma_sai_tx.Init.Channel             = AUDIO_SAIx_DMAx_CHANNEL;
    hdma_sai_tx.Init.Direction           = DMA_MEMORY_TO_PERIPH;
    hdma_sai_tx.Init.PeriphInc           = DMA_PINC_DISABLE;
    hdma_sai_tx.Init.MemInc              = DMA_MINC_ENABLE;
    hdma_sai_tx.Init.PeriphDataAlignment = AUDIO_SAIx_DMAx_PERIPH_DATA_SIZE;
    hdma_sai_tx.Init.MemDataAlignment    = AUDIO_SAIx_DMAx_MEM_DATA_SIZE;
    hdma_sai_tx.Init.Mode                = DMA_CIRCULAR;
    hdma_sai_tx.Init.Priority            = DMA_PRIORITY_HIGH;
    hdma_sai_tx.Init.FIFOMode            = DMA_FIFOMODE_ENABLE;         
    hdma_sai_tx.Init.FIFOThreshold       = DMA_FIFO_THRESHOLD_FULL;
    hdma_sai_tx.Init.MemBurst            = DMA_MBURST_SINGLE;
    hdma_sai_tx.Init.PeriphBurst         = DMA_PBURST_SINGLE; 
    
    hdma_sai_tx.Instance = AUDIO_SAIx_DMAx_STREAM;
    
    /* Associate the DMA handle */
    __HAL_LINKDMA(hsai, hdmatx, hdma_sai_tx);
    
    /* Deinitialize the Stream for new transfer */
    HAL_DMA_DeInit(&hdma_sai_tx);
    
    /* Configure the DMA Stream */
    HAL_DMA_Init(&hdma_sai_tx);      
  }
  
  /* SAI DMA IRQ Channel configuration */
  HAL_NVIC_SetPriority(AUDIO_SAIx_DMAx_IRQ, AUDIO_OUT_IRQ_PREPRIO, 0);
  HAL_NVIC_EnableIRQ(AUDIO_SAIx_DMAx_IRQ); 
}

/**
  * @brief  Deinitialize SAI MSP.
  * @param  hsai: SAI handle
  * @param  Params  
  * @retval None
  */
__weak void BSP_AUDIO_OUT_MspDeInit(SAI_HandleTypeDef *hsai, void *Params)
{
    GPIO_InitTypeDef  gpio_init_structure;

    /* SAI DMA IRQ Channel deactivation */
    HAL_NVIC_DisableIRQ(AUDIO_SAIx_DMAx_IRQ);

    if(hsai->Instance == AUDIO_SAIx)
    {
      /* Deinitialize the DMA stream */
      HAL_DMA_DeInit(hsai->hdmatx);
    }

    /* Disable SAI peripheral */
    __HAL_SAI_DISABLE(hsai);  

    /* Deactivates CODEC_SAI pins FS, SCK, MCK and SD by putting them in input mode */
    gpio_init_structure.Pin = AUDIO_SAIx_FS_PIN;
    HAL_GPIO_DeInit(AUDIO_SAIx_FS_GPIO_PORT, gpio_init_structure.Pin);

    gpio_init_structure.Pin = AUDIO_SAIx_SCK_PIN;
    HAL_GPIO_DeInit(AUDIO_SAIx_SCK_SD_GPIO_PORT, gpio_init_structure.Pin);

    gpio_init_structure.Pin =  AUDIO_SAIx_SD_PIN;
    HAL_GPIO_DeInit(AUDIO_SAIx_SCK_SD_GPIO_PORT, gpio_init_structure.Pin);

    gpio_init_structure.Pin = AUDIO_SAIx_MCLK_PIN;
    HAL_GPIO_DeInit(AUDIO_SAIx_MCLK_GPIO_PORT, gpio_init_structure.Pin);
  
    /* Disable SAI clock */
    AUDIO_SAIx_CLK_DISABLE();

    /* GPIO pins clock and DMA clock can be shut down in the applic 
       by surcharging this __weak function */ 
}

/**
  * @brief  Clock Config.
  * @param  hsai: might be required to set audio peripheral predivider if any.
  * @param  AudioFreq: Audio frequency used to play the audio stream.
  * @param  Params   
  * @note   This API is called by BSP_AUDIO_OUT_Init() and BSP_AUDIO_OUT_SetFrequency()
  *         Being __weak it can be overwritten by the application     
  * @retval None
  */
__weak void BSP_AUDIO_OUT_ClockConfig(SAI_HandleTypeDef *hsai, uint32_t AudioFreq, void *Params)
{ 
  RCC_PeriphCLKInitTypeDef rcc_ex_clk_init_struct;

  HAL_RCCEx_GetPeriphCLKConfig(&rcc_ex_clk_init_struct);
  
  /* Set the PLL configuration according to the audio frequency */
  if((AudioFreq == AUDIO_FREQUENCY_11K) || (AudioFreq == AUDIO_FREQUENCY_22K) || (AudioFreq == AUDIO_FREQUENCY_44K))
  {
    /* Configure PLLSAI prescalers */
    /* PLLSAI_VCO: VCO_429M 
    SAI_CLK(first level) = PLLSAI_VCO/PLLSAIQ = 429/2 = 214.5 Mhz
    SAI_CLK_x = SAI_CLK(first level)/PLLSAIDIVQ = 214.5/19 = 11.289 Mhz */ 
    rcc_ex_clk_init_struct.PeriphClockSelection = RCC_PERIPHCLK_SAI2;
    rcc_ex_clk_init_struct.Sai2ClockSelection = RCC_SAI2CLKSOURCE_PLLI2S;
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SN = 429;
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SQ = 2;
    rcc_ex_clk_init_struct.PLLI2SDivQ = 19;
    
    HAL_RCCEx_PeriphCLKConfig(&rcc_ex_clk_init_struct);
    
  }
  else /* AUDIO_FREQUENCY_8K, AUDIO_FREQUENCY_16K, AUDIO_FREQUENCY_32K, AUDIO_FREQUENCY_48K, AUDIO_FREQUENCY_96K */
  {
    /* SAI clock config 
    PLLSAI_VCO: VCO_344M 
    SAI_CLK(first level) = PLLSAI_VCO/PLLSAIQ = 344/7 = 49.142 Mhz 
    SAI_CLK_x = SAI_CLK(first level)/PLLSAIDIVQ = 49.142/1 = 49.142 Mhz */  
    rcc_ex_clk_init_struct.PeriphClockSelection = RCC_PERIPHCLK_SAI2;
    rcc_ex_clk_init_struct.Sai2ClockSelection = RCC_SAI2CLKSOURCE_PLLI2S;
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SN = 344; 
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SQ = 7; 
    rcc_ex_clk_init_struct.PLLI2SDivQ = 1;      
    
    HAL_RCCEx_PeriphCLKConfig(&rcc_ex_clk_init_struct);
  }
}

/*******************************************************************************
                            Static Functions
*******************************************************************************/

/**
  * @brief  Initialize the Audio Codec audio interface (SAI).
  * @param  AudioFreq: Audio frequency to be configured for the SAI peripheral.
  * @note   The default SlotActive configuration is set to CODEC_AUDIOFRAME_SLOT_0123 
  *         and user can update this configuration using 
  * @retval None
  */
static void SAIx_Init(uint32_t AudioFreq)
{
  /* Initialize the haudio_out_sai Instance parameter */
  haudio_out_sai.Instance = AUDIO_SAIx;
  
  /* Disable SAI peripheral to allow access to SAI internal registers */
  __HAL_SAI_DISABLE(&haudio_out_sai);
  
  /* Configure SAI_Block_x 
  LSBFirst: Disabled 
  DataSize: 16 */
  haudio_out_sai.Init.MonoStereoMode = SAI_STEREOMODE;
  haudio_out_sai.Init.AudioFrequency = AudioFreq;
  haudio_out_sai.Init.AudioMode = SAI_MODEMASTER_TX;
  haudio_out_sai.Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
  haudio_out_sai.Init.Protocol = SAI_FREE_PROTOCOL;
  haudio_out_sai.Init.DataSize = SAI_DATASIZE_16;
  haudio_out_sai.Init.FirstBit = SAI_FIRSTBIT_MSB;
  haudio_out_sai.Init.ClockStrobing = SAI_CLOCKSTROBING_FALLINGEDGE;
  haudio_out_sai.Init.Synchro = SAI_ASYNCHRONOUS;
  haudio_out_sai.Init.OutputDrive = SAI_OUTPUTDRIVE_ENABLE;
  haudio_out_sai.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_1QF;
  haudio_out_sai.Init.SynchroExt     = SAI_SYNCEXT_DISABLE;
  haudio_out_sai.Init.CompandingMode = SAI_NOCOMPANDING;
  haudio_out_sai.Init.TriState       = SAI_OUTPUT_NOTRELEASED;
  haudio_out_sai.Init.Mckdiv         = 0;
    
  /* Configure SAI_Block_x Frame 
  Frame Length: 64
  Frame active Length: 32
  FS Definition: Start frame + Channel Side identification
  FS Polarity: FS active Low
  FS Offset: FS asserted one bit before the first bit of slot 0 */ 
  haudio_out_sai.FrameInit.FrameLength = 64; 
  haudio_out_sai.FrameInit.ActiveFrameLength = 32;
  haudio_out_sai.FrameInit.FSDefinition = SAI_FS_CHANNEL_IDENTIFICATION;
  haudio_out_sai.FrameInit.FSPolarity = SAI_FS_ACTIVE_LOW;
  haudio_out_sai.FrameInit.FSOffset = SAI_FS_BEFOREFIRSTBIT;
  
  /* Configure SAI Block_x Slot 
  Slot First Bit Offset: 0
  Slot Size  : 16
  Slot Number: 4
  Slot Active: All slot actives */
  haudio_out_sai.SlotInit.FirstBitOffset = 0;
  haudio_out_sai.SlotInit.SlotSize = SAI_SLOTSIZE_DATASIZE;
  haudio_out_sai.SlotInit.SlotNumber = 4; 
  haudio_out_sai.SlotInit.SlotActive = CODEC_AUDIOFRAME_SLOT_0123;

  HAL_SAI_Init(&haudio_out_sai);
  
  /* Enable SAI peripheral to generate MCLK */
  __HAL_SAI_ENABLE(&haudio_out_sai);
}

/**
  * @brief  Deinitialize the Audio Codec audio interface (SAI).
  * @retval None
  */
static void SAIx_DeInit(void)
{
  /* Initialize the haudio_out_sai Instance parameter */
  haudio_out_sai.Instance = AUDIO_SAIx;

  /* Disable SAI peripheral */
  __HAL_SAI_DISABLE(&haudio_out_sai);

  HAL_SAI_DeInit(&haudio_out_sai);
}

/**
  * @}
  */

/** @defgroup STM32F769I_EVAL_AUDIO_out_Private_Functions STM32F769I_EVAL_AUDIO_Out Private Functions
  * @{
  */ 

/**
  * @brief  Initialize wave recording. 
  * @param  AudioFreq: Audio frequency to be configured for the DFSDM peripheral. 
  * @param  BitRes: Audio frequency to be configured for the DFSDM peripheral.
  * @param  ChnlNbr: Audio frequency to be configured for the DFSDM peripheral.
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_IN_Init(uint32_t AudioFreq, uint32_t BitRes, uint32_t ChnlNbr)
{ 
  
  /* PLL clock is set depending by the AudioFreq (44.1khz vs 48khz groups) */ 
  BSP_AUDIO_IN_ClockConfig(&haudio_in_dfsdm_leftfilter, AudioFreq, NULL);
  
  /* Init the SAI MSP: this __weak function can be redefined by the application*/
  BSP_AUDIO_IN_MspInit();
  
  /* Initializes DFSDM peripheral */
  DFSDMx_Init(AudioFreq);
  
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}

/**
  * @brief  Allocate channel buffer scratch 
  * @param  pScratch : pointer to scratch tables.
  * @param  size of scratch buffer
  */
uint8_t BSP_AUDIO_IN_AllocScratch (int32_t *pScratch, uint32_t size)
{ 
  uint32_t idx;
  
  ScratchSize = size / DEFAULT_AUDIO_IN_CHANNEL_NBR;
  
  /* copy scratch pointers */
  for (idx = 0; idx < DEFAULT_AUDIO_IN_CHANNEL_NBR ; idx++)
  {
    pScratchBuff[idx] = (int32_t *)(pScratch + idx * ScratchSize);
  }
  /* Return AUDIO_OK */
  return AUDIO_OK;
}

/**
  * @brief  Start audio recording.
  * @param  pbuf: Main buffer pointer for the recorded data storing  
  * @param  size: Current size of the recorded buffer
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_IN_Record(uint16_t* pbuf, uint32_t size)
{
  hAudioIn.pRecBuf = pbuf;
  hAudioIn.RecSize = size;
  /* Reset Application Buffer Trigger */
  AppBuffTrigger = 0;
  AppBuffHalf = 0;
  
  /* Call the Media layer start function for right channel */
  if(HAL_OK != HAL_DFSDM_FilterRegularStart_DMA(&haudio_in_dfsdm_rightfilter, pScratchBuff[0], ScratchSize))
  {
    return AUDIO_ERROR;
  }
  
  /* Call the Media layer start function for left channel */
  if(HAL_OK != HAL_DFSDM_FilterRegularStart_DMA(&haudio_in_dfsdm_leftfilter, pScratchBuff[1], ScratchSize))
  {
    return AUDIO_ERROR;
  }
  
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}

/**
  * @brief  Stop audio recording.
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_IN_Stop(void)
{
  AppBuffTrigger = 0;
  AppBuffHalf    = 0;
  
  /* Call the Media layer stop function for right channel */
  if(HAL_OK != HAL_DFSDM_FilterRegularStop_DMA(&haudio_in_dfsdm_rightfilter))
  {
    return AUDIO_ERROR;
  }
  
  /* Call the Media layer stop function for left channel */
  if(HAL_OK != HAL_DFSDM_FilterRegularStop_DMA(&haudio_in_dfsdm_leftfilter))
  {
    return AUDIO_ERROR;
  }
  
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}

/**
  * @brief  Pause the audio file stream.
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_IN_Pause(void)
{
  /* Call the Media layer stop function */
  if(HAL_OK != HAL_DFSDM_FilterRegularStop_DMA(&haudio_in_dfsdm_rightfilter))
  {
    return AUDIO_ERROR;
  }
  
  /* Call the Media layer stop function */
  if(HAL_OK != HAL_DFSDM_FilterRegularStop_DMA(&haudio_in_dfsdm_leftfilter))
  {
    return AUDIO_ERROR;
  }
  
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}

/**
  * @brief  Resume the audio file stream.
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
uint8_t BSP_AUDIO_IN_Resume(void)
{
  /* Call the Media layer start function for right channel */
  if(HAL_OK != HAL_DFSDM_FilterRegularStart_DMA(&haudio_in_dfsdm_rightfilter, pScratchBuff[0], ScratchSize))
  {
    return AUDIO_ERROR;
  }
  
  /* Call the Media layer start function for left channel */
  if(HAL_OK != HAL_DFSDM_FilterRegularStart_DMA(&haudio_in_dfsdm_leftfilter, pScratchBuff[1], ScratchSize))
  {
    return AUDIO_ERROR;
  }
  
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}

/**
  * @brief  Deinit the audio IN peripherals.
  * @retval None
  */
void BSP_AUDIO_IN_DeInit(void)
{
  BSP_AUDIO_IN_MspDeInit();
  DFSDMx_DeInit();
}


/**
  * @brief  Regular conversion complete callback. 
  * @note   In interrupt mode, user has to read conversion value in this function
            using HAL_DFSDM_FilterGetRegularValue.
  * @param  hdfsdm_filter : DFSDM filter handle.
  * @retval None
  */
void HAL_DFSDM_FilterRegConvCpltCallback(DFSDM_Filter_HandleTypeDef *hdfsdm_filter)
{
  uint32_t index = 0;

  if(hdfsdm_filter == &haudio_in_dfsdm_leftfilter)
  {
    DmaLeftRecBuffCplt = 1;
  }
  else
  {
    DmaRightRecBuffCplt = 1;
  }    
    if((DmaLeftRecBuffCplt == 1) && (DmaRightRecBuffCplt == 1))
    {    
    for(index = (ScratchSize/2) ; index < ScratchSize; index++)
    {
      hAudioIn.pRecBuf[AppBuffTrigger]     = (uint16_t)(SaturaLH((pScratchBuff[0][index] >> 8), -32760, 32760));
      hAudioIn.pRecBuf[AppBuffTrigger + 1] = (uint16_t)(SaturaLH((pScratchBuff[1][index] >> 8), -32760, 32760));
      AppBuffTrigger +=2;
    }
      DmaLeftRecBuffCplt  = 0;
      DmaRightRecBuffCplt = 0;
    }

  /* Call Half Transfer Complete callback */
  if((AppBuffTrigger == hAudioIn.RecSize/2) && (AppBuffHalf == 0))
  {
  AppBuffHalf = 1;  
  BSP_AUDIO_IN_HalfTransfer_CallBack();
  }
  /* Call Transfer Complete callback */
  if(AppBuffTrigger == hAudioIn.RecSize)
  {
    /* Reset Application Buffer Trigger */
    AppBuffTrigger = 0;
    AppBuffHalf = 0; 
    /* Call the record update function to get the next buffer to fill and its size (size is ignored) */
    BSP_AUDIO_IN_TransferComplete_CallBack();
  }  
}

/**
  * @brief  Half regular conversion complete callback. 
  * @param  hdfsdm_filter : DFSDM filter handle.
  * @retval None
  */
void HAL_DFSDM_FilterRegConvHalfCpltCallback(DFSDM_Filter_HandleTypeDef *hdfsdm_filter)
{
  uint32_t index = 0;

    if(hdfsdm_filter == &haudio_in_dfsdm_leftfilter)
    {
      DmaLeftRecHalfBuffCplt = 1;
    }
    else
    {
      DmaRightRecHalfBuffCplt = 1;
    }    
    if((DmaLeftRecHalfBuffCplt == 1) && (DmaRightRecHalfBuffCplt == 1))
    {
      for(index = 0; index < ScratchSize/2; index++)
      {
        hAudioIn.pRecBuf[AppBuffTrigger]     = (int16_t)(SaturaLH((pScratchBuff[0][index] >> 8), -32760, 32760));
        hAudioIn.pRecBuf[AppBuffTrigger + 1] = (int16_t)(SaturaLH((pScratchBuff[1][index] >> 8), -32760, 32760));
        AppBuffTrigger +=2;
      }
      DmaLeftRecHalfBuffCplt  = 0;
      DmaRightRecHalfBuffCplt = 0; 
    }

  /* Call Half Transfer Complete callback */
  if((AppBuffTrigger == hAudioIn.RecSize/2) && (AppBuffHalf == 0))
  { 
  AppBuffHalf = 1;  
  BSP_AUDIO_IN_HalfTransfer_CallBack();
  }
  /* Call Transfer Complete callback */
  if(AppBuffTrigger == hAudioIn.RecSize)
  {
    /* Reset Application Buffer Trigger */
    AppBuffTrigger = 0;
    AppBuffHalf = 0;
    /* Call the record update function to get the next buffer to fill and its size (size is ignored) */
    BSP_AUDIO_IN_TransferComplete_CallBack();
  }  
}

/**
  * @brief  User callback when record buffer is filled.
  * @retval None
  */
__weak void BSP_AUDIO_IN_TransferComplete_CallBack(void)
{
  /* This function should be implemented by the user application.
     It is called into this driver when the current buffer is filled
     to prepare the next buffer pointer and its size. */
}

/**
  * @brief  Manages the DMA Half Transfer complete event.
  * @retval None
  */
__weak void BSP_AUDIO_IN_HalfTransfer_CallBack(void)
{ 
  /* This function should be implemented by the user application.
     It is called into this driver when the current buffer is filled
     to prepare the next buffer pointer and its size. */
}

/**
  * @brief  Audio IN Error callback function.
  * @retval None
  */
__weak void BSP_AUDIO_IN_Error_Callback(void)
{   
  /* This function is called when an Interrupt due to transfer error on or peripheral
     error occurs. */
}

/**
  * @brief  Initialize BSP_AUDIO_IN MSP.
  * @retval None
  */
__weak void BSP_AUDIO_IN_MspInit(void)
{ 
  /* MSP channels initialization */
  DFSDMx_ChannelMspInit();  
  /* MSP filters initialization */
  DFSDMx_FilterMspInit();
}

/**
  * @brief  DeInitialize BSP_AUDIO_IN MSP.
  * @retval None
  */
__weak void BSP_AUDIO_IN_MspDeInit(void)
{ 
  /* MSP channels initialization */
  DFSDMx_ChannelMspDeInit();  
  /* MSP filters initialization */
  DFSDMx_FilterMspDeInit();
}

/**
  * @brief  Clock Config.
  * @param  hdfsdm_filter: might be required to set audio peripheral predivider if any.
  * @param  AudioFreq: Audio frequency used to play the audio stream.
  * @param  Params   
  * @note   This API is called by BSP_AUDIO_IN_Init()
  *         Being __weak it can be overwritten by the application     
  * @retval None
  */
__weak void BSP_AUDIO_IN_ClockConfig(DFSDM_Filter_HandleTypeDef *hdfsdm_filter, uint32_t AudioFreq, void *Params)
{ 
  RCC_PeriphCLKInitTypeDef rcc_ex_clk_init_struct;

  HAL_RCCEx_GetPeriphCLKConfig(&rcc_ex_clk_init_struct);
  
  /* Set the PLL configuration according to the audio frequency */
  if((AudioFreq == AUDIO_FREQUENCY_11K) || (AudioFreq == AUDIO_FREQUENCY_22K) || (AudioFreq == AUDIO_FREQUENCY_44K))
  {
    /* Configure PLLSAI prescalers */
    /* PLLI2S_VCO: VCO_429M 
    SAI_CLK(first level) = PLLI2S_VCO/PLLI2SQ = 429/2 = 214.5 Mhz
    SAI_CLK_x = SAI_CLK(first level)/PLLI2SDIVQ = 214.5/19 = 11.289 Mhz */ 
    rcc_ex_clk_init_struct.PeriphClockSelection = RCC_PERIPHCLK_SAI2;
    rcc_ex_clk_init_struct.Sai2ClockSelection = RCC_SAI2CLKSOURCE_PLLI2S;
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SN = 429;
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SQ = 2;
    rcc_ex_clk_init_struct.PLLI2SDivQ = 19;
    
    HAL_RCCEx_PeriphCLKConfig(&rcc_ex_clk_init_struct);
    
  }
  else /* AUDIO_FREQUENCY_8K, AUDIO_FREQUENCY_16K, AUDIO_FREQUENCY_32K, AUDIO_FREQUENCY_48K, AUDIO_FREQUENCY_96K */
  {
    /* SAI clock config 
    PLLI2S_VCO: VCO_344M 
    SAI_CLK(first level) = PLLI2S_VCO/PLLI2SQ = 344/7 = 49.142 Mhz 
    SAI_CLK_x = SAI_CLK(first level)/PLLI2SDIVQ = 49.142/1 = 49.142 Mhz */  
    rcc_ex_clk_init_struct.PeriphClockSelection = RCC_PERIPHCLK_SAI2;
    rcc_ex_clk_init_struct.Sai2ClockSelection = RCC_SAI2CLKSOURCE_PLLI2S;
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SN = 344; 
    rcc_ex_clk_init_struct.PLLI2S.PLLI2SQ = 7; 
    rcc_ex_clk_init_struct.PLLI2SDivQ = 1;   
    HAL_RCCEx_PeriphCLKConfig(&rcc_ex_clk_init_struct);
  }
  
  rcc_ex_clk_init_struct.PeriphClockSelection = RCC_PERIPHCLK_DFSDM1_AUDIO;
  rcc_ex_clk_init_struct.Dfsdm1AudioClockSelection = RCC_DFSDM1AUDIOCLKSOURCE_SAI2;
  HAL_RCCEx_PeriphCLKConfig(&rcc_ex_clk_init_struct); 
}

/*******************************************************************************
                            Static Functions
*******************************************************************************/
/**
  * @brief  Initialize the Digital Filter for Sigma-Delta Modulators interface (DFSDM).
  * @param  AudioFreq: Audio frequency to be used to set correctly the DFSDM peripheral.
  * @note   Channel output Clock Divider and Filter Oversampling are calculated as follow: 
  *         - Clock_Divider = CLK(input DFSDM)/CLK(micro) with
  *           1MHZ < CLK(micro) < 3.2MHZ (TYP 2.4MHZ for MP34DT01TR)
  *         - Oversampling = CLK(input DFSDM)/(Clock_Divider * AudioFreq)  
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
static uint8_t DFSDMx_Init(uint32_t AudioFreq)
{
  /*####CHANNEL 1####*/
  __HAL_DFSDM_CHANNEL_RESET_HANDLE_STATE(&haudio_in_dfsdm_leftchannel);  
  haudio_in_dfsdm_leftchannel.Instance                      = DFSDM1_Channel1;  
  haudio_in_dfsdm_leftchannel.Init.OutputClock.Activation   = ENABLE;
  haudio_in_dfsdm_leftchannel.Init.OutputClock.Selection    = DFSDM_CHANNEL_OUTPUT_CLOCK_AUDIO;
  /* Set the DFSDM clock OUT audio frequency configuration */
  haudio_in_dfsdm_leftchannel.Init.OutputClock.Divider      = DFSDM_CLOCK_DIVIDER(AudioFreq);
  haudio_in_dfsdm_leftchannel.Init.Input.Multiplexer        = DFSDM_CHANNEL_EXTERNAL_INPUTS;
  haudio_in_dfsdm_leftchannel.Init.Input.DataPacking        = DFSDM_CHANNEL_STANDARD_MODE;
  haudio_in_dfsdm_leftchannel.Init.Input.Pins               = DFSDM_CHANNEL_SAME_CHANNEL_PINS;
  /* Request to sample stable data for LEFT micro on Rising edge */
  haudio_in_dfsdm_leftchannel.Init.SerialInterface.Type     = DFSDM_CHANNEL_SPI_RISING;
  haudio_in_dfsdm_leftchannel.Init.SerialInterface.SpiClock = DFSDM_CHANNEL_SPI_CLOCK_INTERNAL;
  haudio_in_dfsdm_leftchannel.Init.Awd.FilterOrder          = DFSDM_CHANNEL_FASTSINC_ORDER;
  haudio_in_dfsdm_leftchannel.Init.Awd.Oversampling         = 10;
  haudio_in_dfsdm_leftchannel.Init.Offset                   = 0;
  haudio_in_dfsdm_leftchannel.Init.RightBitShift            = DFSDM_RIGHT_BIT_SHIFT(AudioFreq);
  if(HAL_OK != HAL_DFSDM_ChannelInit(&haudio_in_dfsdm_leftchannel))
  {
    return AUDIO_ERROR;
  }

  /*####FILTER 0####*/
  __HAL_DFSDM_FILTER_RESET_HANDLE_STATE(&haudio_in_dfsdm_leftfilter);
  haudio_in_dfsdm_leftfilter.Instance                          = AUDIO_DFSDMx_LEFT_FILTER;  
  haudio_in_dfsdm_leftfilter.Init.RegularParam.Trigger         = DFSDM_FILTER_SW_TRIGGER;
  haudio_in_dfsdm_leftfilter.Init.RegularParam.FastMode        = ENABLE;
  haudio_in_dfsdm_leftfilter.Init.RegularParam.DmaMode         = ENABLE;
  haudio_in_dfsdm_leftfilter.Init.InjectedParam.Trigger        = DFSDM_FILTER_SW_TRIGGER;
  haudio_in_dfsdm_leftfilter.Init.InjectedParam.ScanMode       = ENABLE;
  haudio_in_dfsdm_leftfilter.Init.InjectedParam.DmaMode        = DISABLE;
  haudio_in_dfsdm_leftfilter.Init.InjectedParam.ExtTrigger     = DFSDM_FILTER_EXT_TRIG_TIM1_TRGO;
  haudio_in_dfsdm_leftfilter.Init.InjectedParam.ExtTriggerEdge = DFSDM_FILTER_EXT_TRIG_RISING_EDGE;
  haudio_in_dfsdm_leftfilter.Init.FilterParam.SincOrder        = DFSDM_FILTER_ORDER(AudioFreq);
  /* Set the DFSDM Filters Oversampling to have correct sample rate */
  haudio_in_dfsdm_leftfilter.Init.FilterParam.Oversampling     = DFSDM_OVER_SAMPLING(AudioFreq);
  haudio_in_dfsdm_leftfilter.Init.FilterParam.IntOversampling  = 1;
  if(HAL_OK != HAL_DFSDM_FilterInit(&haudio_in_dfsdm_leftfilter))
  {
    return AUDIO_ERROR;
  }

  /* Configure injected channel */
  if(HAL_OK != HAL_DFSDM_FilterConfigRegChannel(&haudio_in_dfsdm_leftfilter, DFSDM_CHANNEL_1, DFSDM_CONTINUOUS_CONV_ON))
  {
    return AUDIO_ERROR;
  }
  
  /*####CHANNEL 0####*/
  __HAL_DFSDM_CHANNEL_RESET_HANDLE_STATE(&haudio_in_dfsdm_rightchannel);  
  haudio_in_dfsdm_rightchannel.Instance                      = DFSDM1_Channel0;  
  haudio_in_dfsdm_rightchannel.Init.OutputClock.Activation   = ENABLE;
  haudio_in_dfsdm_rightchannel.Init.OutputClock.Selection    = DFSDM_CHANNEL_OUTPUT_CLOCK_AUDIO;
  /* Set the DFSDM clock OUT audio frequency configuration */
  haudio_in_dfsdm_rightchannel.Init.OutputClock.Divider      = DFSDM_CLOCK_DIVIDER(AudioFreq);
  haudio_in_dfsdm_rightchannel.Init.Input.Multiplexer        = DFSDM_CHANNEL_EXTERNAL_INPUTS;
  haudio_in_dfsdm_rightchannel.Init.Input.DataPacking        = DFSDM_CHANNEL_STANDARD_MODE;
  haudio_in_dfsdm_rightchannel.Init.Input.Pins               = DFSDM_CHANNEL_FOLLOWING_CHANNEL_PINS;
  /* Request to sample stable data for RIGHT micro on Falling edge */
  haudio_in_dfsdm_rightchannel.Init.SerialInterface.Type     = DFSDM_CHANNEL_SPI_FALLING;
  haudio_in_dfsdm_rightchannel.Init.SerialInterface.SpiClock = DFSDM_CHANNEL_SPI_CLOCK_INTERNAL;
  haudio_in_dfsdm_rightchannel.Init.Awd.FilterOrder          = DFSDM_CHANNEL_FASTSINC_ORDER;
  haudio_in_dfsdm_rightchannel.Init.Awd.Oversampling         = 10;
  haudio_in_dfsdm_rightchannel.Init.Offset                   = 0;
  haudio_in_dfsdm_rightchannel.Init.RightBitShift            = DFSDM_RIGHT_BIT_SHIFT(AudioFreq);
  if(HAL_OK != HAL_DFSDM_ChannelInit(&haudio_in_dfsdm_rightchannel))
  {
    return AUDIO_ERROR;
  }
  
  /*####FILTER 1####*/
  __HAL_DFSDM_FILTER_RESET_HANDLE_STATE(&haudio_in_dfsdm_rightfilter);
  haudio_in_dfsdm_rightfilter.Instance                          = AUDIO_DFSDMx_RIGHT_FILTER;
  haudio_in_dfsdm_rightfilter.Init.RegularParam.Trigger         = DFSDM_FILTER_SYNC_TRIGGER;
  haudio_in_dfsdm_rightfilter.Init.RegularParam.FastMode        = ENABLE;
  haudio_in_dfsdm_rightfilter.Init.RegularParam.DmaMode         = ENABLE;
  haudio_in_dfsdm_rightfilter.Init.InjectedParam.Trigger        = DFSDM_FILTER_SW_TRIGGER;
  haudio_in_dfsdm_rightfilter.Init.InjectedParam.ScanMode       = DISABLE;
  haudio_in_dfsdm_rightfilter.Init.InjectedParam.DmaMode        = DISABLE;
  haudio_in_dfsdm_rightfilter.Init.InjectedParam.ExtTrigger     = DFSDM_FILTER_EXT_TRIG_TIM1_TRGO;
  haudio_in_dfsdm_rightfilter.Init.InjectedParam.ExtTriggerEdge = DFSDM_FILTER_EXT_TRIG_RISING_EDGE;
  haudio_in_dfsdm_rightfilter.Init.FilterParam.SincOrder        = DFSDM_FILTER_ORDER(AudioFreq);
  /* Set the DFSDM Filters Oversampling to have correct sample rate */
  haudio_in_dfsdm_rightfilter.Init.FilterParam.Oversampling     = DFSDM_OVER_SAMPLING(AudioFreq);
  haudio_in_dfsdm_rightfilter.Init.FilterParam.IntOversampling  = 1;
  if(HAL_OK != HAL_DFSDM_FilterInit(&haudio_in_dfsdm_rightfilter))
  {
    return AUDIO_ERROR;
  }
  /* Configure injected channel */
  if(HAL_OK != HAL_DFSDM_FilterConfigRegChannel(&haudio_in_dfsdm_rightfilter, DFSDM_CHANNEL_0, DFSDM_CONTINUOUS_CONV_ON))
  {
    return AUDIO_ERROR;
  }  
  
  return AUDIO_OK;
}

/**
  * @brief  De-initialize the Digital Filter for Sigma-Delta Modulators interface (DFSDM).
  * @retval AUDIO_OK if correct communication, else wrong communication
  */
static uint8_t DFSDMx_DeInit(void)
{
  /* De-initializes the DFSDM filters to allow access to DFSDM internal registers */
  if(HAL_OK != HAL_DFSDM_FilterDeInit(&haudio_in_dfsdm_leftfilter))
  {
    return AUDIO_ERROR;
  }

  if(HAL_OK != HAL_DFSDM_FilterDeInit(&haudio_in_dfsdm_rightfilter))
  {
    return AUDIO_ERROR;
  }

  /* De-initializes the DFSDM channels to allow access to DFSDM internal registers */
  if(HAL_OK != HAL_DFSDM_ChannelDeInit(&haudio_in_dfsdm_leftchannel))
  {
    return AUDIO_ERROR;
  }

  if(HAL_OK != HAL_DFSDM_ChannelDeInit(&haudio_in_dfsdm_rightchannel))
  {
    return AUDIO_ERROR;
  }

  return AUDIO_OK;
}

/**
  * @brief  Initialize the DFSDM channel MSP.
  * @retval None
  */
static void DFSDMx_ChannelMspInit(void)
{
  GPIO_InitTypeDef  GPIO_InitStruct;  

  /* Enable DFSDM clock */
  AUDIO_DFSDMx_CLK_ENABLE();
  
  /* Enable GPIO clock */
  AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_CLK_ENABLE();
  
  /* DFSDM pins configuration: DFSDM_CKOUT, DMIC_DATIN pins ------------------*/
  GPIO_InitStruct.Pin = AUDIO_DFSDMx_CKOUT_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = AUDIO_DFSDMx_CKOUT_AF;
  HAL_GPIO_Init(AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_PORT, &GPIO_InitStruct);
  
  GPIO_InitStruct.Pin = AUDIO_DFSDMx_DMIC_DATIN_PIN;
  GPIO_InitStruct.Alternate = AUDIO_DFSDMx_DMIC_DATIN_AF;
  HAL_GPIO_Init(AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_PORT, &GPIO_InitStruct); 
}

/**
  * @brief  DeInitialize the DFSDM channel MSP.
  * @retval None
  */
static void DFSDMx_ChannelMspDeInit(void)
{
  GPIO_InitTypeDef  GPIO_InitStruct;  

  /* DFSDM pins configuration: DFSDM_CKOUT, DMIC_DATIN pins ------------------*/
  GPIO_InitStruct.Pin = AUDIO_DFSDMx_CKOUT_PIN | AUDIO_DFSDMx_DMIC_DATIN_PIN;
  HAL_GPIO_DeInit(AUDIO_DFSDMx_CKOUT_DMIC_DATIN_GPIO_PORT, GPIO_InitStruct.Pin);
}

/**
  * @brief  Initialize the DFSDM filter MSP.
  * @retval None
  */
static void DFSDMx_FilterMspInit(void)
{  
  /* Enable DFSDM clock */
  AUDIO_DFSDMx_CLK_ENABLE();
  
  /* Enable the DMA clock */
  AUDIO_DFSDMx_DMAx_CLK_ENABLE();
  
  hdma_dfsdm_left.Init.Direction           = DMA_PERIPH_TO_MEMORY;
  hdma_dfsdm_left.Init.PeriphInc           = DMA_PINC_DISABLE;
  hdma_dfsdm_left.Init.MemInc              = DMA_MINC_ENABLE;
  hdma_dfsdm_left.Init.PeriphDataAlignment = AUDIO_DFSDMx_DMAx_PERIPH_DATA_SIZE;
  hdma_dfsdm_left.Init.MemDataAlignment    = AUDIO_DFSDMx_DMAx_MEM_DATA_SIZE;
  hdma_dfsdm_left.Init.Mode                = DMA_CIRCULAR;
  hdma_dfsdm_left.Init.Priority            = DMA_PRIORITY_HIGH;
  hdma_dfsdm_left.Instance               = DMA2_Stream0;
  hdma_dfsdm_left.Init.Channel           = AUDIO_DFSDMx_DMAx_LEFT_CHANNEL; 
  
  /* Associate the DMA handle */
  __HAL_LINKDMA(&haudio_in_dfsdm_leftfilter, hdmaReg, hdma_dfsdm_left);
  
  /* Reset DMA handle state */
  __HAL_DMA_RESET_HANDLE_STATE(&hdma_dfsdm_left);
  
  /* Configure the DMA Channel */
  HAL_DMA_Init(&hdma_dfsdm_left);      
  
  /* DMA IRQ Channel configuration */
  HAL_NVIC_SetPriority(AUDIO_DFSDMx_DMAx_LEFT_IRQ, AUDIO_OUT_IRQ_PREPRIO, 0);
  HAL_NVIC_EnableIRQ(AUDIO_DFSDMx_DMAx_LEFT_IRQ);
  
  
  /* Configure the hdma_dfsdmReg handle parameters */ 
  hdma_dfsdm_right.Init.Direction           = DMA_PERIPH_TO_MEMORY;
  hdma_dfsdm_right.Init.PeriphInc           = DMA_PINC_DISABLE;
  hdma_dfsdm_right.Init.MemInc              = DMA_MINC_ENABLE;
  hdma_dfsdm_right.Init.PeriphDataAlignment = AUDIO_DFSDMx_DMAx_PERIPH_DATA_SIZE;
  hdma_dfsdm_right.Init.MemDataAlignment    = AUDIO_DFSDMx_DMAx_MEM_DATA_SIZE;
  hdma_dfsdm_right.Init.Mode                = DMA_CIRCULAR;
  hdma_dfsdm_right.Init.Priority            = DMA_PRIORITY_HIGH;  
  hdma_dfsdm_right.Instance                 = DMA2_Stream5;
  hdma_dfsdm_right.Init.Channel             = AUDIO_DFSDMx_DMAx_RIGHT_CHANNEL;
  
  /* Associate the DMA handle */
  __HAL_LINKDMA(&haudio_in_dfsdm_rightfilter, hdmaReg, hdma_dfsdm_right);
  
  /* Reset DMA handle state */
  __HAL_DMA_RESET_HANDLE_STATE(&hdma_dfsdm_right);
  
  /* Configure the DMA Channel */
  HAL_DMA_Init(&hdma_dfsdm_right);      
  
  /* DMA IRQ Channel configuration */
  HAL_NVIC_SetPriority(AUDIO_DFSDMx_DMAx_RIGHT_IRQ, AUDIO_OUT_IRQ_PREPRIO, 0);
  HAL_NVIC_EnableIRQ(AUDIO_DFSDMx_DMAx_RIGHT_IRQ);
}

/**
  * @brief  DeInitialize the DFSDM filter MSP.
  * @retval None
  */
static void DFSDMx_FilterMspDeInit(void)
{
  /* Configure the DMA Channel */
  HAL_DMA_DeInit(&hdma_dfsdm_left);
  HAL_DMA_DeInit(&hdma_dfsdm_right);  
}

/**
  * @}
  */ 
  
/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */ 

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