stm32469i_discovery_audio.c

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/*==============================================================================
                                 User NOTES
 
How To use this driver:
-----------------------
   + This driver supports STM32F4xx devices on STM32469I-Discovery (MB1189) Discovery boards.
   + Call the function BSP_AUDIO_OUT_Init(
                                    OutputDevice: physical output mode (OUTPUT_DEVICE_HEADPHONE1,
                                                  OUTPUT_DEVICE_HEADPHONE2 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_HEADPHONE1 : only headphones 1 will be set as output for the audio stream.
      - OUTPUT_DEVICE_HEADPHONE2 : only headphones 2 will be set as output for the audio stream.
      - OUTPUT_DEVICE_BOTH       : both Headphones are used as outputs for the audio stream
                                 at the same time.
      Note. On STM32469I-Discovery SAI_DMA is configured in CIRCULAR mode. Due to this the application
        does NOT need to call BSP_AUDIO_OUT_ChangeBuffer() to assure straming.
   + Call the function BSP_Discovery_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 stm32469i_discovery_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 stm32469i_discovery_audio.h file.
 
Driver architecture:
--------------------
   + This driver provide the High Audio Layer: consists of the function API exported in the stm32469i_discovery_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 stm32469i_discovery_audio_codec.c file (I2Sx_Init(), I2Sx_DeInit(), SAIx_Init() and SAIx_DeInit())
 
Known Limitations:
------------------
   1- If the TDM Format used to paly 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.
==============================================================================*/
 
/* Includes ------------------------------------------------------------------*/
#include <string.h>
#include "stm32469i_discovery_audio.h"
 
#define OUTPUT_DEVICE_HEADPHONE1 OUTPUT_DEVICE_HEADPHONE
 
/* Headphone2 is connected to Speaker output of the CS43L22 codec */
#define OUTPUT_DEVICE_HEADPHONE2 OUTPUT_DEVICE_SPEAKER
 
/*### PLAY ###*/
/* SCK(kHz) = SAI_CK_x/(SAIClockDivider*2*256) */
#define SAIClockDivider(__FREQUENCY__) \
        (__FREQUENCY__ == AUDIO_FREQUENCY_8K)  ? 12 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_11K) ? 2 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_16K) ? 6 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_22K) ? 1 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_32K) ? 3 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_44K) ? 0 \
      : (__FREQUENCY__ == AUDIO_FREQUENCY_48K) ? 2 : 1  \
 
 
/*
Note: 
  these global variables are not compliant to naming rules (upper case without "_" ), 
  but we keep this naming for compatibility, in fact these variables (not static)
  could have been used by the application, example the stm32f4xx_it.c:
    void DMA2_Stream6_IRQHandler(void)
     {  HAL_DMA_IRQHandler(haudio_out_sai.hdmatx);  }
*/
AUDIO_DrvTypeDef          *audio_drv;
SAI_HandleTypeDef         haudio_out_sai;
I2S_HandleTypeDef         haudio_in_i2s;
TIM_HandleTypeDef         haudio_tim;
 
/* PDM filters params */
PDM_Filter_Handler_t  PDM_FilterHandler[2];
PDM_Filter_Config_t   PDM_FilterConfig[2];
 
uint8_t Channel_Demux[128] = {
    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f,
    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f,
    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f,
    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f
};
 
uint16_t __IO AudioInVolume = DEFAULT_AUDIO_IN_VOLUME;
 
static uint8_t SAIx_Init(uint32_t AudioFreq);
static void SAIx_DeInit(void);
static void I2Sx_Init(uint32_t AudioFreq);
static void I2Sx_DeInit(void);
static void TIMx_IC_MspInit(TIM_HandleTypeDef *htim);
static void TIMx_IC_MspDeInit(TIM_HandleTypeDef *htim);
static void TIMx_Init(void);
static void TIMx_DeInit(void);
static void PDMDecoder_Init(uint32_t AudioFreq, uint32_t ChnlNbrIn, uint32_t ChnlNbrOut);
 
void BSP_AUDIO_OUT_ChangeAudioConfig(uint32_t AudioOutOption);
 
uint8_t BSP_AUDIO_OUT_Init(uint16_t OutputDevice, 
                           uint8_t Volume, 
                           uint32_t AudioFreq)
{
  uint8_t ret = AUDIO_OK;
 
  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);
  }
 
  if (SAIx_Init(AudioFreq) != AUDIO_OK)
  {
    ret = AUDIO_ERROR;
  }
 
  if(ret == AUDIO_OK)
  {
    /* Retieve audio codec identifier */
    if (cs43l22_drv.ReadID(AUDIO_I2C_ADDRESS) == CS43L22_ID)
    {  
      /* Initialize the audio driver structure */
      audio_drv = &cs43l22_drv;
    }
    else
    {
      ret = AUDIO_ERROR;
    }
  }
 
  if(ret == AUDIO_OK)
  {
    /* Initialize the audio codec internal registers */
    if (audio_drv->Init(AUDIO_I2C_ADDRESS,
                        OutputDevice, 
                        Volume, 
                        AudioFreq) != AUDIO_OK)
    {
      ret = AUDIO_ERROR;
    }
  }
 
  return ret;
}
 
uint8_t BSP_AUDIO_OUT_Play(uint16_t* pBuffer, uint32_t Size)
{
  uint8_t ret = AUDIO_OK;
 
  /* Call the audio Codec Play function */
  if(audio_drv->Play(AUDIO_I2C_ADDRESS, pBuffer, Size) != 0)
  {  
    ret = AUDIO_ERROR;
  }
 
  /* Initiate a DMA transfer of PCM samples towards the serial audio interface */  
  if(ret == AUDIO_OK)
  {
    if (HAL_SAI_Transmit_DMA(&haudio_out_sai, (uint8_t*) pBuffer, DMA_MAX(Size / AUDIODATA_SIZE))!= HAL_OK)
    {
      ret = AUDIO_ERROR;
    }
  }
        
  return ret;
}
 
void BSP_AUDIO_OUT_ChangeBuffer(uint16_t *pData, uint16_t Size)
{
   HAL_SAI_Transmit_DMA(&haudio_out_sai, (uint8_t*) pData, Size);
}
 
uint8_t BSP_AUDIO_OUT_Pause(void)
{
  uint8_t ret = AUDIO_OK;
 
  /* Call the Audio Codec Pause/Resume function */
  if(audio_drv->Pause(AUDIO_I2C_ADDRESS) != 0)
  {
    ret =  AUDIO_ERROR;
  }
 
  /* Pause DMA transfer of PCM samples towards the serial audio interface */  
  if(ret == AUDIO_OK)
  {
    if (HAL_SAI_DMAPause(&haudio_out_sai)!= HAL_OK)
    {
      ret =  AUDIO_ERROR;
    }
  }
 
  /* Return AUDIO_OK when all operations are correctly done */
  return ret;
}
 
uint8_t BSP_AUDIO_OUT_Resume(void)
{
  uint8_t ret = AUDIO_OK;
 
  /* Call the Audio Codec Pause/Resume function */
  if(audio_drv->Resume(AUDIO_I2C_ADDRESS) != 0)
  {
    ret =  AUDIO_ERROR;
  }
 
  /* Resume DMA transfer of PCM samples towards the serial audio interface */  
  if(ret == AUDIO_OK)
  {
    if (HAL_SAI_DMAResume(&haudio_out_sai)!= HAL_OK)
    {
      ret =  AUDIO_ERROR;
    }
  }
 
  /* Return AUDIO_OK when all operations are correctly done */
  return ret;
}
 
uint8_t BSP_AUDIO_OUT_Stop(uint32_t Option)
{
  uint8_t ret = AUDIO_OK;
 
 /* Call Audio Codec Stop function */
  if(audio_drv->Stop(AUDIO_I2C_ADDRESS, Option) != 0)
  {
    ret = AUDIO_ERROR;
  }
 
  if(ret == AUDIO_OK)
  {
    if(Option == CODEC_PDWN_HW)
    {
      /* Wait at least 100us */
      HAL_Delay(2);
    }
 
    /* Stop DMA transfer of PCM samples towards the serial audio interface */  
    if (HAL_SAI_DMAStop(&haudio_out_sai)!= HAL_OK)
    {
      ret = AUDIO_ERROR;
    }
  }
  /* Return AUDIO_OK when all operations are correctly done */
  return ret;
}
 
uint8_t BSP_AUDIO_OUT_SetVolume(uint8_t Volume)
{
  uint8_t ret = AUDIO_OK;
 
  /* Call the codec volume control function with converted volume value */
  if(audio_drv->SetVolume(AUDIO_I2C_ADDRESS, Volume) != 0)
  {
    ret =  AUDIO_ERROR;
  }
 
  /* Return AUDIO_OK when all operations are correctly done */
  return ret;
}
 
uint8_t BSP_AUDIO_OUT_SetMute(uint32_t Cmd)
{
  uint8_t ret = AUDIO_OK;
 
  /* Call the Codec Mute function */
  if(audio_drv->SetMute(AUDIO_I2C_ADDRESS, Cmd) != 0)
  {
    ret = AUDIO_ERROR;
  }
 
  /* Return AUDIO_OK when all operations are correctly done */
  return ret;
}
 
uint8_t BSP_AUDIO_OUT_SetOutputMode(uint8_t Output)
{
  uint8_t ret = AUDIO_OK;
 
  /* Call the Codec output device function */
  if(audio_drv->SetOutputMode(AUDIO_I2C_ADDRESS, Output) != 0)
  {
    ret = AUDIO_ERROR;
  }
 
  /* Return AUDIO_OK when all operations are correctly done */
  return ret;
}
 
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);
}
 
void BSP_AUDIO_OUT_ChangeAudioConfig(uint32_t AudioOutOption)
{ 
  /********** Playback Buffer circular/normal mode **********/
  if(AudioOutOption & BSP_AUDIO_OUT_CIRCULARMODE)
  {
    /* Deinitialize the Stream to update DMA mode */
    HAL_DMA_DeInit(haudio_out_sai.hdmatx);
    
    /* Update the SAI audio Transfer DMA mode */
    haudio_out_sai.hdmatx->Init.Mode = DMA_CIRCULAR;
    
    /* Configure the DMA Stream with new Transfer DMA mode */
    HAL_DMA_Init(haudio_out_sai.hdmatx);      
  }
  else /* BSP_AUDIO_OUT_NORMALMODE */
  {
    /* Deinitialize the Stream to update DMA mode */
    HAL_DMA_DeInit(haudio_out_sai.hdmatx);
    
    /* Update the SAI audio Transfer DMA mode */
    haudio_out_sai.hdmatx->Init.Mode = DMA_NORMAL;
    
    /* Configure the DMA Stream with new Transfer DMA mode */
    HAL_DMA_Init(haudio_out_sai.hdmatx);      
  }
  
  /********** Playback Buffer stereo/mono mode **********/
  if(AudioOutOption & BSP_AUDIO_OUT_STEREOMODE)
  {
    /* 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.Init.MonoStereoMode = SAI_STEREOMODE;
    HAL_SAI_Init(&haudio_out_sai);
    
    /* Enable SAI peripheral to generate MCLK */
    __HAL_SAI_ENABLE(&haudio_out_sai);
  }
  else /* BSP_AUDIO_OUT_MONOMODE */
  {
    /* 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.Init.MonoStereoMode = SAI_MONOMODE;
    HAL_SAI_Init(&haudio_out_sai);
    
    /* Enable SAI peripheral to generate MCLK */
    __HAL_SAI_ENABLE(&haudio_out_sai);
  }
}
 
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);
}
 
void BSP_AUDIO_OUT_DeInit(void)
{
  SAIx_DeInit();
  /* DeInit the SAI MSP : this __weak function can be rewritten by the applic */
  BSP_AUDIO_OUT_MspDeInit(&haudio_out_sai, NULL);
 
  /* Reset the audio output context */
  memset(&audio_drv, 0, sizeof(audio_drv));
}
 
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 stm32469i_discovery_audio.h) */
  BSP_AUDIO_OUT_TransferComplete_CallBack();
}
 
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 stm32469i_discovery_audio.h) */
  BSP_AUDIO_OUT_HalfTransfer_CallBack();
}
 
void HAL_SAI_ErrorCallback(SAI_HandleTypeDef *hsai)
{
  BSP_AUDIO_OUT_Error_CallBack();
}
 
__weak void BSP_AUDIO_OUT_TransferComplete_CallBack(void)
{
}
 
__weak void BSP_AUDIO_OUT_HalfTransfer_CallBack(void)
{
}
 
__weak void BSP_AUDIO_OUT_Error_CallBack(void)
{
}
 
__weak void BSP_AUDIO_OUT_MspInit(SAI_HandleTypeDef *hsai, void *Params)
{
  static DMA_HandleTypeDef hdma_sai_tx;
  GPIO_InitTypeDef  gpio_init_structure;
 
  /* Put CS43L2 codec reset high -----------------------------------*/
  AUDIO_RESET_ENABLE();
  gpio_init_structure.Pin =  AUDIO_RESET_PIN;
  gpio_init_structure.Mode = GPIO_MODE_OUTPUT_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_HIGH;
  HAL_GPIO_Init(AUDIO_RESET_GPIO_PORT, &gpio_init_structure);
  HAL_GPIO_WritePin(AUDIO_RESET_GPIO_PORT, AUDIO_RESET_PIN, GPIO_PIN_SET);
 
  /* Enable SAI clock */
  AUDIO_SAIx_CLK_ENABLE();
 
  /* Enable GPIO clock */
  AUDIO_SAIx_MCLK_ENABLE();
  AUDIO_SAIx_SCK_SD_FS_ENABLE();
 
  /* CODEC_SAI pins configuration: MCK pin -----------------------------------*/
  gpio_init_structure.Pin =  AUDIO_SAIx_MCK_PIN;
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_HIGH;
  gpio_init_structure.Alternate = AUDIO_SAIx_MCLK_SCK_SD_FS_AF;
  HAL_GPIO_Init(AUDIO_SAIx_MCLK_GPIO_PORT, &gpio_init_structure);
 
  /* CODEC_SAI pins configuration: FS, SCK, MCK and SD pins ------------------*/
  gpio_init_structure.Pin = AUDIO_SAIx_FS_PIN | AUDIO_SAIx_SCK_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_HIGH;
  gpio_init_structure.Alternate = AUDIO_SAIx_MCLK_SCK_SD_FS_AF;
  HAL_GPIO_Init(AUDIO_SAIx_SCK_SD_FS_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);
 
}
__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);  
 
  /* Put CS43L2 codec reset low -----------------------------------*/
  HAL_GPIO_WritePin(AUDIO_RESET_GPIO_PORT, AUDIO_RESET_PIN, GPIO_PIN_RESET);
 
  /* Deactives CODEC_SAI pins FS, SCK, MCK and SD by putting them in input mode */
  gpio_init_structure.Pin = AUDIO_SAIx_MCK_PIN;
  HAL_GPIO_DeInit(AUDIO_SAIx_MCLK_GPIO_PORT, gpio_init_structure.Pin);
 
  gpio_init_structure.Pin = AUDIO_SAIx_FS_PIN | AUDIO_SAIx_SCK_PIN | AUDIO_SAIx_SD_PIN;
  HAL_GPIO_DeInit(AUDIO_SAIx_SCK_SD_FS_GPIO_PORT, gpio_init_structure.Pin);
 
  gpio_init_structure.Pin = AUDIO_RESET_PIN;
  HAL_GPIO_DeInit(AUDIO_RESET_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 surcgarging this __weak function */ 
}
 
__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 PLLI2S prescalers */
    /* PLLI2S_VCO: VCO_429M
    I2S_CLK(first level) = PLLI2S_VCO/PLLI2SQ = 429/2 = 214.5 Mhz
    I2S_CLK_x = I2S_CLK(first level)/PLLI2SDIVQ = 214.5/19 = 11.289 Mhz */
    rcc_ex_clk_init_struct.PeriphClockSelection = RCC_PERIPHCLK_SAI_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_48K), AUDIO_FREQUENCY_96K */
  {
    /* SAI clock config 
    PLLSAI_VCO: VCO_344M 
    I2S_CLK(first level) = PLLI2S_VCO/PLLI2SQ = 344/7 = 49.142 Mhz 
    I2S_CLK_x = SAI_CLK(first level)/PLLI2SDIVQ = 49.142/1 = 49.142 Mhz */  
    rcc_ex_clk_init_struct.PeriphClockSelection = RCC_PERIPHCLK_SAI_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
*******************************************************************************/
static uint8_t SAIx_Init(uint32_t AudioFreq)
{
  uint8_t ret = AUDIO_OK;
 
  /* 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.AudioFrequency = AudioFreq;
  haudio_out_sai.Init.ClockSource = SAI_CLKSOURCE_PLLI2S;
  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.AudioFrequency = SAI_AUDIO_FREQUENCY_MCKDIV;
  haudio_out_sai.Init.SynchroExt     = SAI_SYNCEXT_DISABLE;
  haudio_out_sai.Init.Mckdiv         = SAIClockDivider(AudioFreq);
  haudio_out_sai.Init.MonoStereoMode = SAI_STEREOMODE;
  haudio_out_sai.Init.CompandingMode = SAI_NOCOMPANDING;
  haudio_out_sai.Init.TriState       = SAI_OUTPUT_NOTRELEASED;
*/
 
  /* 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;
 
  /* Initializes the SAI peripheral*/
  if (HAL_SAI_Init(&haudio_out_sai) != HAL_OK)
  {
    ret = AUDIO_ERROR;
  }
 
  /* Enable SAI peripheral to generate MCLK */
  __HAL_SAI_ENABLE(&haudio_out_sai);
 
  return ret;
 
}
 
static void SAIx_DeInit(void)
{
  /* Initialize the hAudioOutSai Instance parameter */
  haudio_out_sai.Instance = AUDIO_SAIx;
 
  /* Disable SAI peripheral */
  __HAL_SAI_DISABLE(&haudio_out_sai);
 
  HAL_SAI_DeInit(&haudio_out_sai);
}
 
uint8_t BSP_AUDIO_IN_Init(uint32_t AudioFreq, uint32_t BitRes, uint32_t ChnlNbr)
{
  /* DeInit the I2S */
  I2Sx_DeInit();
 
  /* Configure PLL clock */ 
  BSP_AUDIO_IN_ClockConfig(&haudio_in_i2s, NULL);
 
  /* Configure the PDM library */
  PDMDecoder_Init(AudioFreq, ChnlNbr, ChnlNbr);
 
  /* Configure the I2S peripheral */
  haudio_in_i2s.Instance = AUDIO_I2Sx;
  if(HAL_I2S_GetState(&haudio_in_i2s) == HAL_I2S_STATE_RESET)
  { 
    /* Initialize the I2S Msp: this __weak function can be rewritten by the application */
    BSP_AUDIO_IN_MspInit(&haudio_in_i2s, NULL);
  }
 
  I2Sx_Init(AudioFreq);
 
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}
 
uint8_t BSP_AUDIO_IN_Record(uint16_t* pbuf, uint32_t size)
{
  uint32_t ret = AUDIO_ERROR;
 
  /* Start the process receive DMA */
  HAL_I2S_Receive_DMA(&haudio_in_i2s, pbuf, size);
 
  /* Return AUDIO_OK when all operations are correctly done */
  ret = AUDIO_OK;
 
  return ret;
}
 
uint8_t BSP_AUDIO_IN_Stop(void)
{
  uint32_t ret = AUDIO_ERROR;
 
  /* Call the Media layer pause function */
  HAL_I2S_DMAPause(&haudio_in_i2s);
 
  /* TIMx Peripheral clock disable */
  AUDIO_TIMx_CLK_DISABLE();
 
  /* Return AUDIO_OK when all operations are correctly done */
  ret = AUDIO_OK;
 
  return ret;
}
 
uint8_t BSP_AUDIO_IN_Pause(void)
{
  /* Call the Media layer pause function */
  HAL_I2S_DMAPause(&haudio_in_i2s);
 
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}
 
uint8_t BSP_AUDIO_IN_Resume(void)
{
  /* Call the Media layer pause/resume function */
  HAL_I2S_DMAResume(&haudio_in_i2s);
 
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}
 
uint8_t BSP_AUDIO_IN_SetVolume(uint8_t Volume)
{
  /* Set the Global variable AudioInVolume  */
  AudioInVolume = Volume;
 
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}
 
void BSP_AUDIO_IN_DeInit(void)
{
  I2Sx_DeInit();
    /* DeInit the I2S MSP : this __weak function can be rewritten by the applic */
  BSP_AUDIO_IN_MspDeInit(&haudio_in_i2s, NULL);
  TIMx_DeInit();
}
 
uint8_t BSP_AUDIO_IN_PDMToPCM(uint16_t* PDMBuf, uint16_t* PCMBuf)
{
  uint8_t app_pdm[INTERNAL_BUFF_SIZE*2];
  uint8_t byte1 = 0, byte2 = 0;
  uint32_t index = 0;
 
  /* PDM Demux */
  for(index = 0; index<INTERNAL_BUFF_SIZE/2; index++)
  {
    byte2 = (PDMBuf[index] >> 8)& 0xFF;
    byte1 = (PDMBuf[index] & 0xFF);
    app_pdm[(index*2)+1] = Channel_Demux[byte1 & CHANNEL_DEMUX_MASK] | Channel_Demux[byte2 & CHANNEL_DEMUX_MASK] << 4;
    app_pdm[(index*2)] = Channel_Demux[(byte1 >> 1) & CHANNEL_DEMUX_MASK] | Channel_Demux[(byte2 >> 1) & CHANNEL_DEMUX_MASK] << 4;
  }
 
  for(index = 0; index < DEFAULT_AUDIO_IN_CHANNEL_NBR; index++)
  {
    /* PDM to PCM filter */
    PDM_Filter((uint8_t*)&app_pdm[index], (uint16_t*)&(PCMBuf[index]), &PDM_FilterHandler[index]);
  }
 
  /* Return AUDIO_OK when all operations are correctly done */
  return AUDIO_OK;
}
 
void HAL_I2S_RxCpltCallback(I2S_HandleTypeDef *hi2s)
{
  /* Call the record update function to get the next buffer to fill and its size (size is ignored) */
  BSP_AUDIO_IN_TransferComplete_CallBack();
}
 
void HAL_I2S_RxHalfCpltCallback(I2S_HandleTypeDef *hi2s)
{
  /* Manage the remaining file size and new address offset: This function
     should be coded by user (its prototype is already declared in stm32469i_discovery_audio.h) */
  BSP_AUDIO_IN_HalfTransfer_CallBack();
}
 
void HAL_I2S_ErrorCallback(I2S_HandleTypeDef *hi2s)
{
  /* Manage the error generated on DMA FIFO: This function
     should be coded by user (its prototype is already declared in stm32469i_discovery_audio.h) */
  BSP_AUDIO_IN_Error_Callback();
}
 
__weak void BSP_AUDIO_IN_ClockConfig(I2S_HandleTypeDef *hi2s, void *Params)
{
  RCC_PeriphCLKInitTypeDef RCC_ExCLKInitStruct;
  
  HAL_RCCEx_GetPeriphCLKConfig(&RCC_ExCLKInitStruct);
  RCC_ExCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
  RCC_ExCLKInitStruct.PLLI2S.PLLI2SN = 384;
  RCC_ExCLKInitStruct.PLLI2S.PLLI2SR = 2;
  HAL_RCCEx_PeriphCLKConfig(&RCC_ExCLKInitStruct); 
}
 
__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. */
}
 
__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. */
}
 
__weak void BSP_AUDIO_IN_Error_Callback(void)
{
  /* This function is called when an Interrupt due to transfer error on or peripheral
     error occurs. */
}
 
__weak void BSP_AUDIO_IN_MspInit(I2S_HandleTypeDef *hi2s, void *Params)
{
  static DMA_HandleTypeDef hdma_i2s_rx;
  GPIO_InitTypeDef  gpio_init_structure;
 
  /* Configure the Timer which clocks the MEMS */
  /* Moved inside MSP to allow applic to redefine the TIMx_MspInit */
  TIMx_Init();
  
  /* Enable I2S clock */
  AUDIO_I2Sx_CLK_ENABLE();
 
  /* Enable SCK and SD GPIO clock */
  AUDIO_I2Sx_SD_GPIO_CLK_ENABLE();
  AUDIO_I2Sx_SCK_GPIO_CLK_ENABLE();
  /* CODEC_I2S pins configuration: SCK and SD pins */
  gpio_init_structure.Pin = AUDIO_I2Sx_SCK_PIN;
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_FAST;
  gpio_init_structure.Alternate = AUDIO_I2Sx_SCK_AF;
  HAL_GPIO_Init(AUDIO_I2Sx_SCK_GPIO_PORT, &gpio_init_structure);
 
  gpio_init_structure.Pin = AUDIO_I2Sx_SD_PIN;
  gpio_init_structure.Alternate = AUDIO_I2Sx_SD_AF;
  HAL_GPIO_Init(AUDIO_I2Sx_SD_GPIO_PORT, &gpio_init_structure);
 
  /* Enable PD12 (I2S3_CLK) connected to PB3 via jamper JP4 */
  /* on Eval this was provided by PC6 (initialized in TIMx section) */
/*
  gpio_init_structure.Pin = GPIO_PIN_12;
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_FAST;
  gpio_init_structure.Alternate = AUDIO_I2Sx_SCK_AF;
  HAL_GPIO_Init(GPIOD, &gpio_init_structure); */
  
 
  /* Enable the DMA clock */
  AUDIO_I2Sx_DMAx_CLK_ENABLE();
 
  if(hi2s->Instance == AUDIO_I2Sx)
  {
    /* Configure the hdma_i2sRx handle parameters */
    hdma_i2s_rx.Init.Channel             = AUDIO_I2Sx_DMAx_CHANNEL;
    hdma_i2s_rx.Init.Direction           = DMA_PERIPH_TO_MEMORY;
    hdma_i2s_rx.Init.PeriphInc           = DMA_PINC_DISABLE;
    hdma_i2s_rx.Init.MemInc              = DMA_MINC_ENABLE;
    hdma_i2s_rx.Init.PeriphDataAlignment = AUDIO_I2Sx_DMAx_PERIPH_DATA_SIZE;
    hdma_i2s_rx.Init.MemDataAlignment    = AUDIO_I2Sx_DMAx_MEM_DATA_SIZE;
    hdma_i2s_rx.Init.Mode                = DMA_CIRCULAR;
    hdma_i2s_rx.Init.Priority            = DMA_PRIORITY_HIGH;
    hdma_i2s_rx.Init.FIFOMode            = DMA_FIFOMODE_DISABLE;
    hdma_i2s_rx.Init.FIFOThreshold       = DMA_FIFO_THRESHOLD_FULL;
    hdma_i2s_rx.Init.MemBurst            = DMA_MBURST_SINGLE;
    hdma_i2s_rx.Init.PeriphBurst         = DMA_MBURST_SINGLE;
 
    hdma_i2s_rx.Instance = AUDIO_I2Sx_DMAx_STREAM;
 
    /* Associate the DMA handle */
    __HAL_LINKDMA(hi2s, hdmarx, hdma_i2s_rx);
 
    /* Deinitialize the Stream for new transfer */
    HAL_DMA_DeInit(&hdma_i2s_rx);
 
    /* Configure the DMA Stream */
    HAL_DMA_Init(&hdma_i2s_rx);
  }
 
  /* I2S DMA IRQ Channel configuration */
  HAL_NVIC_SetPriority(AUDIO_I2Sx_DMAx_IRQ, AUDIO_IN_IRQ_PREPRIO, 0);
  HAL_NVIC_EnableIRQ(AUDIO_I2Sx_DMAx_IRQ);
}
 
__weak void BSP_AUDIO_IN_MspDeInit(I2S_HandleTypeDef *hi2s, void *Params)
{
  GPIO_InitTypeDef  gpio_init_structure;
 
  /* I2S DMA IRQ Channel deactivation */
  HAL_NVIC_DisableIRQ(AUDIO_I2Sx_DMAx_IRQ); 
  
  if(hi2s->Instance == AUDIO_I2Sx)
  {
    /* Deinitialize the Stream for new transfer */
    HAL_DMA_DeInit(hi2s->hdmarx);
  }
 
 /* Disable I2S block */
  __HAL_I2S_DISABLE(hi2s);
 
  /* Disable pins: SCK and SD pins */
  gpio_init_structure.Pin = AUDIO_I2Sx_SCK_PIN;
  HAL_GPIO_DeInit(AUDIO_I2Sx_SCK_GPIO_PORT, gpio_init_structure.Pin);
  gpio_init_structure.Pin = AUDIO_I2Sx_SD_PIN;
  HAL_GPIO_DeInit(AUDIO_I2Sx_SD_GPIO_PORT, gpio_init_structure.Pin); 
 
  /* Disable I2S clock */
  AUDIO_I2Sx_CLK_DISABLE();
 
  /* GPIO pins clock and DMA clock can be shut down in the applic 
     by surcgarging this __weak function */ 
}
 
/*******************************************************************************
                            Static Functions
*******************************************************************************/
 
static void PDMDecoder_Init(uint32_t AudioFreq, uint32_t ChnlNbrIn, uint32_t ChnlNbrOut)
{
  uint32_t index = 0;
 
  /* Enable CRC peripheral to unlock the PDM library */
  __HAL_RCC_CRC_CLK_ENABLE();
 
  for(index = 0; index < ChnlNbrIn; index++)
  {
    /* Init PDM filters */
    PDM_FilterHandler[index].bit_order  = PDM_FILTER_BIT_ORDER_LSB;
    PDM_FilterHandler[index].endianness = PDM_FILTER_ENDIANNESS_LE;
    PDM_FilterHandler[index].high_pass_tap = 2122358088;
    PDM_FilterHandler[index].out_ptr_channels = ChnlNbrOut;
    PDM_FilterHandler[index].in_ptr_channels  = ChnlNbrIn;
    PDM_Filter_Init((PDM_Filter_Handler_t *)(&PDM_FilterHandler[index]));
 
    /* PDM lib config phase */
    PDM_FilterConfig[index].output_samples_number = AudioFreq/1000;
    PDM_FilterConfig[index].mic_gain = 24;
    PDM_FilterConfig[index].decimation_factor = PDM_FILTER_DEC_FACTOR_64;
    PDM_Filter_setConfig((PDM_Filter_Handler_t *)&PDM_FilterHandler[index], &PDM_FilterConfig[index]);
  }
}
 
static void I2Sx_Init(uint32_t AudioFreq)
{
  /* Initialize the haudio_in_i2s Instance parameter */
  haudio_in_i2s.Instance = AUDIO_I2Sx;
 
 /* Disable I2S block */
  __HAL_I2S_DISABLE(&haudio_in_i2s);
 
  /* I2S2 peripheral configuration */
  haudio_in_i2s.Init.AudioFreq = 4 * AudioFreq;
  haudio_in_i2s.Init.ClockSource = I2S_CLOCK_PLL;
  haudio_in_i2s.Init.CPOL = I2S_CPOL_LOW;
  haudio_in_i2s.Init.DataFormat = I2S_DATAFORMAT_16B;
  haudio_in_i2s.Init.MCLKOutput = I2S_MCLKOUTPUT_DISABLE;
  haudio_in_i2s.Init.Mode = I2S_MODE_MASTER_RX;
  haudio_in_i2s.Init.Standard = I2S_STANDARD_LSB;
  
  /* Init the I2S */
  HAL_I2S_Init(&haudio_in_i2s); 
 
 /* Disable I2S block */
  __HAL_I2S_ENABLE(&haudio_in_i2s);
 
}
 
static void I2Sx_DeInit(void)
{
  /* Initialize the hAudioInI2s Instance parameter */
  haudio_in_i2s.Instance = AUDIO_I2Sx;
 
 /* Disable I2S block */
  __HAL_I2S_DISABLE(&haudio_in_i2s);
 
  /* DeInit the I2S */
  HAL_I2S_DeInit(&haudio_in_i2s); 
}
 
 
static void TIMx_IC_MspInit(TIM_HandleTypeDef *htim)
{
  GPIO_InitTypeDef   gpio_init_structure;
 
  /* Enable peripherals and GPIO Clocks --------------------------------------*/
  /* TIMx Peripheral clock enable */
  AUDIO_TIMx_CLK_ENABLE();
 
  /* Enable GPIO Channels Clock */
  AUDIO_TIMx_GPIO_CLK_ENABLE();
 
  /* Configure I/Os ----------------------------------------------------------*/
  /* Common configuration for all channels */
  gpio_init_structure.Mode = GPIO_MODE_AF_PP;
  gpio_init_structure.Pull = GPIO_NOPULL;
  gpio_init_structure.Speed = GPIO_SPEED_HIGH;
  gpio_init_structure.Alternate = AUDIO_TIMx_AF;
 
  /* Configure TIM input channel */
  gpio_init_structure.Pin = AUDIO_TIMx_IN_GPIO_PIN;
  HAL_GPIO_Init(AUDIO_TIMx_GPIO_PORT, &gpio_init_structure);
 
  /* Configure TIM output channel */
  gpio_init_structure.Pin = AUDIO_TIMx_OUT_GPIO_PIN;
  HAL_GPIO_Init(AUDIO_TIMx_GPIO_PORT, &gpio_init_structure);
}
 
static void TIMx_IC_MspDeInit(TIM_HandleTypeDef *htim)
{
    /* Disable TIMx Peripheral clock  */
    AUDIO_TIMx_CLK_DISABLE();
 
    /* GPIO pins clock and DMA clock can be shut down in the applic 
       by surcgarging this __weak function */ 
}
 
static void TIMx_Init(void)
{
  TIM_IC_InitTypeDef     s_ic_config;
  TIM_OC_InitTypeDef     s_oc_config;
  TIM_ClockConfigTypeDef s_clk_source_config;
  TIM_SlaveConfigTypeDef s_slave_config;
  
  /* Configure the TIM peripheral --------------------------------------------*/
  /* Set TIMx instance */
  haudio_tim.Instance = AUDIO_TIMx;
  /* Timer Input Capture Configuration Structure declaration */
   /* Initialize TIMx peripheral as follow:
       + Period = 0xFFFF
       + Prescaler = 0
       + ClockDivision = 0
       + Counter direction = Up
  */
  haudio_tim.Init.Period        = 1;
  haudio_tim.Init.Prescaler     = 0;
  haudio_tim.Init.ClockDivision = 0;
  haudio_tim.Init.CounterMode   = TIM_COUNTERMODE_UP;
 
  /* Initialize the TIMx peripheral with the structure above */
  TIMx_IC_MspInit(&haudio_tim);
  HAL_TIM_IC_Init(&haudio_tim);
 
  /* Configure the Input Capture channel -------------------------------------*/
  /* Configure the Input Capture of channel 2 */
  s_ic_config.ICPolarity  = TIM_ICPOLARITY_FALLING;
  s_ic_config.ICSelection = TIM_ICSELECTION_DIRECTTI;
  s_ic_config.ICPrescaler = TIM_ICPSC_DIV1;
  s_ic_config.ICFilter    = 0;
  HAL_TIM_IC_ConfigChannel(&haudio_tim, &s_ic_config, AUDIO_TIMx_IN_CHANNEL);
  
  /* Select external clock mode 1 */
  s_clk_source_config.ClockSource = TIM_CLOCKSOURCE_ETRMODE1;
  s_clk_source_config.ClockPolarity = TIM_CLOCKPOLARITY_NONINVERTED;
  s_clk_source_config.ClockPrescaler = TIM_CLOCKPRESCALER_DIV1;
  s_clk_source_config.ClockFilter = 0;   
  HAL_TIM_ConfigClockSource(&haudio_tim, &s_clk_source_config);
  
  /* Select Input Channel as input trigger */
  s_slave_config.InputTrigger = TIM_TS_TI1FP1;
  s_slave_config.SlaveMode = TIM_SLAVEMODE_EXTERNAL1;
  s_slave_config.TriggerPolarity = TIM_TRIGGERPOLARITY_NONINVERTED;
  s_slave_config.TriggerPrescaler = TIM_CLOCKPRESCALER_DIV1;
  s_slave_config.TriggerFilter = 0;
  HAL_TIM_SlaveConfigSynchronization(&haudio_tim, &s_slave_config);
  
  /* Output Compare PWM Mode configuration: Channel2 */
  s_oc_config.OCMode = TIM_OCMODE_PWM1;
  s_oc_config.OCIdleState = TIM_OCIDLESTATE_SET;
  s_oc_config.Pulse = 1;
  s_oc_config.OCPolarity = TIM_OCPOLARITY_HIGH;
  s_oc_config.OCNPolarity = TIM_OCNPOLARITY_HIGH;
  s_oc_config.OCFastMode = TIM_OCFAST_DISABLE;
  s_oc_config.OCNIdleState = TIM_OCNIDLESTATE_SET;
  
  /* Initialize the TIM3 Channel2 with the structure above */
  HAL_TIM_PWM_ConfigChannel(&haudio_tim, &s_oc_config, AUDIO_TIMx_OUT_CHANNEL);
 
  /* Start the TIM3 Channel2 */
  HAL_TIM_PWM_Start(&haudio_tim, AUDIO_TIMx_OUT_CHANNEL);
 
  /* Start the TIM3 Channel1 */
  HAL_TIM_IC_Start(&haudio_tim, AUDIO_TIMx_IN_CHANNEL);
}
 
static void TIMx_DeInit(void)
{
  haudio_tim.Instance = AUDIO_TIMx;
  
  /* Stop the TIM3 Channel2 */
  HAL_TIM_PWM_Stop(&haudio_tim, AUDIO_TIMx_OUT_CHANNEL);
  /* Stop the TIM3 Channel1 */
  HAL_TIM_IC_Stop(&haudio_tim, AUDIO_TIMx_IN_CHANNEL);
 
  HAL_TIM_IC_DeInit(&haudio_tim);
  
  /* Initialize the TIMx peripheral with the structure above */
  TIMx_IC_MspDeInit(&haudio_tim);
}
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/