stm32f7xx_hal_sai.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f7xx_hal.h"

#ifdef HAL_SAI_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/

typedef enum {
  SAI_MODE_DMA,
  SAI_MODE_IT
}SAI_ModeTypedef;
/* Private define ------------------------------------------------------------*/

#define SAI_FIFO_SIZE         8
#define SAI_DEFAULT_TIMEOUT   4 /* 4ms */
#define SAI_xCR2_MUTECNT_OFFSET POSITION_VAL(SAI_xCR2_MUTECNT)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/

static void SAI_FillFifo(SAI_HandleTypeDef *hsai);
static uint32_t SAI_InterruptFlag(SAI_HandleTypeDef *hsai, uint32_t mode);
static HAL_StatusTypeDef SAI_InitI2S(SAI_HandleTypeDef *hsai, uint32_t protocol, uint32_t datasize, uint32_t nbslot);
static HAL_StatusTypeDef SAI_InitPCM(SAI_HandleTypeDef *hsai, uint32_t protocol, uint32_t datasize, uint32_t nbslot);

static HAL_StatusTypeDef SAI_Disable(SAI_HandleTypeDef *hsai);
static void SAI_Transmit_IT8Bit(SAI_HandleTypeDef *hsai);
static void SAI_Transmit_IT16Bit(SAI_HandleTypeDef *hsai);
static void SAI_Transmit_IT32Bit(SAI_HandleTypeDef *hsai);
static void SAI_Receive_IT8Bit(SAI_HandleTypeDef *hsai);
static void SAI_Receive_IT16Bit(SAI_HandleTypeDef *hsai);
static void SAI_Receive_IT32Bit(SAI_HandleTypeDef *hsai);

static void SAI_DMATxCplt(DMA_HandleTypeDef *hdma);
static void SAI_DMATxHalfCplt(DMA_HandleTypeDef *hdma);
static void SAI_DMARxCplt(DMA_HandleTypeDef *hdma);
static void SAI_DMARxHalfCplt(DMA_HandleTypeDef *hdma);
static void SAI_DMAError(DMA_HandleTypeDef *hdma);
static void SAI_DMAAbort(DMA_HandleTypeDef *hdma);
/* Exported functions ---------------------------------------------------------*/

HAL_StatusTypeDef HAL_SAI_InitProtocol(SAI_HandleTypeDef *hsai, uint32_t protocol, uint32_t datasize, uint32_t nbslot)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the parameters */
  assert_param(IS_SAI_SUPPORTED_PROTOCOL(protocol));
  assert_param(IS_SAI_PROTOCOL_DATASIZE(datasize));

  switch(protocol)
  {
  case SAI_I2S_STANDARD :
  case SAI_I2S_MSBJUSTIFIED :
  case SAI_I2S_LSBJUSTIFIED :
    status = SAI_InitI2S(hsai, protocol, datasize, nbslot);
    break;
  case SAI_PCM_LONG :
  case SAI_PCM_SHORT :
    status = SAI_InitPCM(hsai, protocol, datasize, nbslot);
    break;
  default :
    status = HAL_ERROR;
    break;
  }
  
  if(status == HAL_OK)
  {
    status = HAL_SAI_Init(hsai);
  }

  return status;
}

HAL_StatusTypeDef HAL_SAI_Init(SAI_HandleTypeDef *hsai)
{
  uint32_t tmpregisterGCR = 0;
  uint32_t ckstr_bits = 0;
  uint32_t syncen_bits = 0;

  /* Check the SAI handle allocation */
  if(hsai == NULL)
  {
    return HAL_ERROR;
  }
  
  /* check the instance */
  assert_param(IS_SAI_ALL_INSTANCE(hsai->Instance));
  
  /* Check the SAI Block parameters */
  assert_param(IS_SAI_AUDIO_FREQUENCY(hsai->Init.AudioFrequency));
  assert_param(IS_SAI_BLOCK_PROTOCOL(hsai->Init.Protocol));
  assert_param(IS_SAI_BLOCK_MODE(hsai->Init.AudioMode));
  assert_param(IS_SAI_BLOCK_DATASIZE(hsai->Init.DataSize));
  assert_param(IS_SAI_BLOCK_FIRST_BIT(hsai->Init.FirstBit));
  assert_param(IS_SAI_BLOCK_CLOCK_STROBING(hsai->Init.ClockStrobing));
  assert_param(IS_SAI_BLOCK_SYNCHRO(hsai->Init.Synchro));
  assert_param(IS_SAI_BLOCK_OUTPUT_DRIVE(hsai->Init.OutputDrive));
  assert_param(IS_SAI_BLOCK_NODIVIDER(hsai->Init.NoDivider));
  assert_param(IS_SAI_BLOCK_FIFO_THRESHOLD(hsai->Init.FIFOThreshold));
  assert_param(IS_SAI_MONO_STEREO_MODE(hsai->Init.MonoStereoMode));
  assert_param(IS_SAI_BLOCK_COMPANDING_MODE(hsai->Init.CompandingMode));
  assert_param(IS_SAI_BLOCK_TRISTATE_MANAGEMENT(hsai->Init.TriState));
  assert_param(IS_SAI_BLOCK_SYNCEXT(hsai->Init.SynchroExt));
  
  /* Check the SAI Block Frame parameters */
  assert_param(IS_SAI_BLOCK_FRAME_LENGTH(hsai->FrameInit.FrameLength));
  assert_param(IS_SAI_BLOCK_ACTIVE_FRAME(hsai->FrameInit.ActiveFrameLength));
  assert_param(IS_SAI_BLOCK_FS_DEFINITION(hsai->FrameInit.FSDefinition));
  assert_param(IS_SAI_BLOCK_FS_POLARITY(hsai->FrameInit.FSPolarity));
  assert_param(IS_SAI_BLOCK_FS_OFFSET(hsai->FrameInit.FSOffset));
  
  /* Check the SAI Block Slot parameters */
  assert_param(IS_SAI_BLOCK_FIRSTBIT_OFFSET(hsai->SlotInit.FirstBitOffset));
  assert_param(IS_SAI_BLOCK_SLOT_SIZE(hsai->SlotInit.SlotSize));
  assert_param(IS_SAI_BLOCK_SLOT_NUMBER(hsai->SlotInit.SlotNumber));
  assert_param(IS_SAI_SLOT_ACTIVE(hsai->SlotInit.SlotActive));
  
  if(hsai->State == HAL_SAI_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    hsai->Lock = HAL_UNLOCKED;
    
    /* Init the low level hardware : GPIO, CLOCK, NVIC and DMA */
    HAL_SAI_MspInit(hsai);
  }
  
  hsai->State = HAL_SAI_STATE_BUSY;
  
  /* Disable the selected SAI peripheral */
  SAI_Disable(hsai);
  
  /* SAI Block Synchro Configuration -----------------------------------------*/
  /* This setting must be done with both audio block (A & B) disabled         */
  switch(hsai->Init.SynchroExt)
  {
    case SAI_SYNCEXT_DISABLE :
      tmpregisterGCR = 0;
      break;
    case SAI_SYNCEXT_OUTBLOCKA_ENABLE :
      tmpregisterGCR = SAI_GCR_SYNCOUT_0;
      break;
    case SAI_SYNCEXT_OUTBLOCKB_ENABLE :
      tmpregisterGCR = SAI_GCR_SYNCOUT_1;
      break;
  default:
    break;
  }
  
  switch(hsai->Init.Synchro)
  {
    case SAI_ASYNCHRONOUS :
      {
        syncen_bits = 0;
      }
      break;
    case SAI_SYNCHRONOUS :
      {
        syncen_bits = SAI_xCR1_SYNCEN_0;
      }
      break;
    case SAI_SYNCHRONOUS_EXT_SAI1 :
      {
        syncen_bits = SAI_xCR1_SYNCEN_1;
      }
      break;
    case SAI_SYNCHRONOUS_EXT_SAI2 :
      {
        syncen_bits = SAI_xCR1_SYNCEN_1;
        tmpregisterGCR |= SAI_GCR_SYNCIN_0;
      }
      break;
  default:
    break;      
  }

  if((hsai->Instance == SAI1_Block_A) || (hsai->Instance == SAI1_Block_B))
  {
    SAI1->GCR = tmpregisterGCR;
  }
  else 
  {
    SAI2->GCR = tmpregisterGCR;
  }

  if(hsai->Init.AudioFrequency != SAI_AUDIO_FREQUENCY_MCKDIV)
  {
    uint32_t freq = 0;
    uint32_t tmpval;

    if((hsai->Instance == SAI1_Block_A ) || (hsai->Instance == SAI1_Block_B ))
    {
      freq = HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_SAI1);
    }
    if((hsai->Instance == SAI2_Block_A ) || (hsai->Instance == SAI2_Block_B ))
    {
      freq = HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_SAI2);
    }
    
    /* Configure Master Clock using the following formula :
       MCLK_x = SAI_CK_x / (MCKDIV[3:0] * 2) with MCLK_x = 256 * FS
       FS = SAI_CK_x / (MCKDIV[3:0] * 2) * 256
       MCKDIV[3:0] = SAI_CK_x / FS * 512 */
    /* (freq x 10) to keep Significant digits */
    tmpval = (freq * 10) / (hsai->Init.AudioFrequency * 2 * 256);
    hsai->Init.Mckdiv = tmpval / 10;
    
    /* Round result to the nearest integer */
    if((tmpval % 10) > 8)
    {
      hsai->Init.Mckdiv+= 1;
    }
  }
  
  /* Compute CKSTR bits of SAI CR1 according ClockStrobing and AudioMode */
  if((hsai->Init.AudioMode == SAI_MODEMASTER_TX) || (hsai->Init.AudioMode == SAI_MODESLAVE_TX))
  { /* Transmit */
    ckstr_bits = (hsai->Init.ClockStrobing == SAI_CLOCKSTROBING_RISINGEDGE) ? 0 : SAI_xCR1_CKSTR;
  }
  else
  { /* Receive */
    ckstr_bits = (hsai->Init.ClockStrobing == SAI_CLOCKSTROBING_RISINGEDGE) ? SAI_xCR1_CKSTR : 0;
  }
  
  /* SAI Block Configuration -------------------------------------------------*/
  /* SAI CR1 Configuration */
  hsai->Instance->CR1&=~(SAI_xCR1_MODE | SAI_xCR1_PRTCFG |  SAI_xCR1_DS |      \
                         SAI_xCR1_LSBFIRST | SAI_xCR1_CKSTR | SAI_xCR1_SYNCEN |\
                         SAI_xCR1_MONO | SAI_xCR1_OUTDRIV  | SAI_xCR1_DMAEN |  \
                         SAI_xCR1_NODIV | SAI_xCR1_MCKDIV);
  
  hsai->Instance->CR1|=(hsai->Init.AudioMode | hsai->Init.Protocol |           \
                        hsai->Init.DataSize | hsai->Init.FirstBit  |           \
                        ckstr_bits | syncen_bits |                               \
                        hsai->Init.MonoStereoMode | hsai->Init.OutputDrive |   \
                        hsai->Init.NoDivider | (hsai->Init.Mckdiv << 20));
  
  /* SAI CR2 Configuration */
  hsai->Instance->CR2&= ~(SAI_xCR2_FTH | SAI_xCR2_FFLUSH | SAI_xCR2_COMP | SAI_xCR2_CPL);
  hsai->Instance->CR2|=  (hsai->Init.FIFOThreshold | hsai->Init.CompandingMode | hsai->Init.TriState);
  
  /* SAI Frame Configuration -----------------------------------------*/
  hsai->Instance->FRCR&=(~(SAI_xFRCR_FRL | SAI_xFRCR_FSALL | SAI_xFRCR_FSDEF | \
                           SAI_xFRCR_FSPOL | SAI_xFRCR_FSOFF));
  hsai->Instance->FRCR|=((hsai->FrameInit.FrameLength - 1) |
                          hsai->FrameInit.FSOffset |
                          hsai->FrameInit.FSDefinition |
                          hsai->FrameInit.FSPolarity   |
                          ((hsai->FrameInit.ActiveFrameLength - 1) << 8));
  
  /* SAI Block_x SLOT Configuration ------------------------------------------*/
  /* This register has no meaning in AC 97 and SPDIF audio protocol */
  hsai->Instance->SLOTR&= (~(SAI_xSLOTR_FBOFF | SAI_xSLOTR_SLOTSZ |            \
                             SAI_xSLOTR_NBSLOT | SAI_xSLOTR_SLOTEN ));
  
  hsai->Instance->SLOTR|=  hsai->SlotInit.FirstBitOffset |  hsai->SlotInit.SlotSize
                          | (hsai->SlotInit.SlotActive << 16) | ((hsai->SlotInit.SlotNumber - 1) <<  8);
  
  /* Initialize the error code */
  hsai->ErrorCode = HAL_SAI_ERROR_NONE;
  
  /* Initialize the SAI state */
  hsai->State= HAL_SAI_STATE_READY;
  
  /* Release Lock */
  __HAL_UNLOCK(hsai);
  
  return HAL_OK;
}

HAL_StatusTypeDef HAL_SAI_DeInit(SAI_HandleTypeDef *hsai)
{
  /* Check the SAI handle allocation */
  if(hsai == NULL)
  {
    return HAL_ERROR;
  }

  hsai->State = HAL_SAI_STATE_BUSY;

  /* Disabled All interrupt and clear all the flag */
  hsai->Instance->IMR = 0;
  hsai->Instance->CLRFR = 0xFFFFFFFFU;
  
  /* Disable the SAI */
  SAI_Disable(hsai);

  /* Flush the fifo */
  SET_BIT(hsai->Instance->CR2, SAI_xCR2_FFLUSH);
  
  /* DeInit the low level hardware: GPIO, CLOCK, NVIC and DMA */
  HAL_SAI_MspDeInit(hsai);

  /* Initialize the error code */
  hsai->ErrorCode = HAL_SAI_ERROR_NONE;

  /* Initialize the SAI state */
  hsai->State = HAL_SAI_STATE_RESET;

  /* Release Lock */
  __HAL_UNLOCK(hsai);

  return HAL_OK;
}

__weak void HAL_SAI_MspInit(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_MspInit could be implemented in the user file
   */
}

__weak void HAL_SAI_MspDeInit(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_MspDeInit could be implemented in the user file
   */
}

HAL_StatusTypeDef HAL_SAI_Transmit(SAI_HandleTypeDef *hsai, uint8_t* pData, uint16_t Size, uint32_t Timeout)
{
  uint32_t tickstart = HAL_GetTick();

  if((pData == NULL ) || (Size == 0))
  {
    return  HAL_ERROR;
  }

  if(hsai->State == HAL_SAI_STATE_READY)
  {
    /* Process Locked */
    __HAL_LOCK(hsai);

    hsai->XferSize = Size;
    hsai->XferCount = Size;
    hsai->pBuffPtr = pData;
    hsai->State = HAL_SAI_STATE_BUSY_TX;
    hsai->ErrorCode = HAL_SAI_ERROR_NONE;

    /* Check if the SAI is already enabled */
    if((hsai->Instance->CR1 & SAI_xCR1_SAIEN) == RESET)
    {
      /* fill the fifo with data before to enabled the SAI */
      SAI_FillFifo(hsai);
      /* Enable SAI peripheral */
      __HAL_SAI_ENABLE(hsai);
    }

    while(hsai->XferCount > 0)
    {
      /* Write data if the FIFO is not full */
      if((hsai->Instance->SR & SAI_xSR_FLVL) != SAI_FIFOSTATUS_FULL)
      {
        if((hsai->Init.DataSize == SAI_DATASIZE_8) && (hsai->Init.CompandingMode == SAI_NOCOMPANDING))
        {
          hsai->Instance->DR = (*hsai->pBuffPtr++);
        }
        else if(hsai->Init.DataSize <= SAI_DATASIZE_16)
        {
          hsai->Instance->DR = *((uint16_t *)hsai->pBuffPtr);
          hsai->pBuffPtr+= 2;
        }
        else
        {
          hsai->Instance->DR = *((uint32_t *)hsai->pBuffPtr);
          hsai->pBuffPtr+= 4;
        }
        hsai->XferCount--;
      }
      else
      {
        /* Check for the Timeout */
        if((Timeout != HAL_MAX_DELAY) && ((Timeout == 0)||((HAL_GetTick() - tickstart) > Timeout)))
        {
          /* Update error code */
          hsai->ErrorCode |= HAL_SAI_ERROR_TIMEOUT;

          /* Clear all the flags */
          hsai->Instance->CLRFR = 0xFFFFFFFFU;

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

          /* Flush the fifo */
          SET_BIT(hsai->Instance->CR2, SAI_xCR2_FFLUSH);

          /* Change the SAI state */
          hsai->State = HAL_SAI_STATE_READY;

          /* Process Unlocked */
          __HAL_UNLOCK(hsai);

          return HAL_ERROR;
        }
      }
    }

    hsai->State = HAL_SAI_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(hsai);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_SAI_Receive(SAI_HandleTypeDef *hsai, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
  uint32_t tickstart = HAL_GetTick();

  if((pData == NULL ) || (Size == 0))
  {
    return  HAL_ERROR;
  }

  if(hsai->State == HAL_SAI_STATE_READY)
  {
    /* Process Locked */
    __HAL_LOCK(hsai);

    hsai->pBuffPtr = pData;
    hsai->XferSize = Size;
    hsai->XferCount = Size;
    hsai->State = HAL_SAI_STATE_BUSY_RX;
    hsai->ErrorCode = HAL_SAI_ERROR_NONE;

    /* Check if the SAI is already enabled */
    if((hsai->Instance->CR1 & SAI_xCR1_SAIEN) == RESET)
    {
      /* Enable SAI peripheral */
      __HAL_SAI_ENABLE(hsai);
    }

    /* Receive data */
    while(hsai->XferCount > 0)
    {
      if((hsai->Instance->SR & SAI_xSR_FLVL) != SAI_FIFOSTATUS_EMPTY)
      {
        if((hsai->Init.DataSize == SAI_DATASIZE_8) && (hsai->Init.CompandingMode == SAI_NOCOMPANDING))
        {
          (*hsai->pBuffPtr++) = hsai->Instance->DR;
        }
        else if(hsai->Init.DataSize <= SAI_DATASIZE_16)
        {
          *((uint16_t*)hsai->pBuffPtr) = hsai->Instance->DR;
          hsai->pBuffPtr+= 2;
        }
        else
        {
          *((uint32_t*)hsai->pBuffPtr) = hsai->Instance->DR;
          hsai->pBuffPtr+= 4;
        }
        hsai->XferCount--;
      }
      else
      {
        /* Check for the Timeout */
        if((Timeout != HAL_MAX_DELAY) && ((Timeout == 0)||((HAL_GetTick() - tickstart) > Timeout)))
        {
          /* Update error code */
          hsai->ErrorCode |= HAL_SAI_ERROR_TIMEOUT;

          /* Clear all the flags */
          hsai->Instance->CLRFR = 0xFFFFFFFFU;

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

          /* Flush the fifo */
          SET_BIT(hsai->Instance->CR2, SAI_xCR2_FFLUSH);

          /* Change the SAI state */
          hsai->State = HAL_SAI_STATE_READY;

          /* Process Unlocked */
          __HAL_UNLOCK(hsai);

          return HAL_ERROR;
        }
      }
    }

    hsai->State = HAL_SAI_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(hsai);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_SAI_Transmit_IT(SAI_HandleTypeDef *hsai, uint8_t *pData, uint16_t Size)
{
  if((pData == NULL) || (Size == 0))
  {
    return  HAL_ERROR;
  }

  if(hsai->State == HAL_SAI_STATE_READY)
  {
    /* Process Locked */
    __HAL_LOCK(hsai);

    hsai->pBuffPtr = pData;
    hsai->XferSize = Size;
    hsai->XferCount = Size;
    hsai->ErrorCode = HAL_SAI_ERROR_NONE;
    hsai->State = HAL_SAI_STATE_BUSY_TX;

    if((hsai->Init.DataSize == SAI_DATASIZE_8) && (hsai->Init.CompandingMode == SAI_NOCOMPANDING))
    {
      hsai->InterruptServiceRoutine = SAI_Transmit_IT8Bit;
    }
    else if(hsai->Init.DataSize <= SAI_DATASIZE_16)
    {
      hsai->InterruptServiceRoutine = SAI_Transmit_IT16Bit;
    }
    else
    {
      hsai->InterruptServiceRoutine = SAI_Transmit_IT32Bit;
    }

    /* Fill the fifo before starting the communication */
    SAI_FillFifo(hsai);

    /* Enable FRQ and OVRUDR interrupts */
    __HAL_SAI_ENABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));

    /* Check if the SAI is already enabled */
    if((hsai->Instance->CR1 & SAI_xCR1_SAIEN) == RESET)
    {
      /* Enable SAI peripheral */
      __HAL_SAI_ENABLE(hsai);
    }
    /* Process Unlocked */
    __HAL_UNLOCK(hsai);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_SAI_Receive_IT(SAI_HandleTypeDef *hsai, uint8_t *pData, uint16_t Size)
{
  if((pData == NULL) || (Size == 0))
  {
    return  HAL_ERROR;
  }

  if(hsai->State == HAL_SAI_STATE_READY)
  {
    /* Process Locked */
    __HAL_LOCK(hsai);

    hsai->pBuffPtr = pData;
    hsai->XferSize = Size;
    hsai->XferCount = Size;
    hsai->ErrorCode = HAL_SAI_ERROR_NONE;
    hsai->State = HAL_SAI_STATE_BUSY_RX;

    if((hsai->Init.DataSize == SAI_DATASIZE_8) && (hsai->Init.CompandingMode == SAI_NOCOMPANDING))
    {
      hsai->InterruptServiceRoutine = SAI_Receive_IT8Bit;
    }
    else if(hsai->Init.DataSize <= SAI_DATASIZE_16)
    {
      hsai->InterruptServiceRoutine = SAI_Receive_IT16Bit;
    }
    else
    {
      hsai->InterruptServiceRoutine = SAI_Receive_IT32Bit;
    }

    /* Enable TXE and OVRUDR interrupts */
    __HAL_SAI_ENABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));

    /* Check if the SAI is already enabled */
    if((hsai->Instance->CR1 & SAI_xCR1_SAIEN) == RESET)
    {
      /* Enable SAI peripheral */
      __HAL_SAI_ENABLE(hsai);
    }

    /* Process Unlocked */
    __HAL_UNLOCK(hsai);
    
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_SAI_DMAPause(SAI_HandleTypeDef *hsai)
{
  /* Process Locked */
  __HAL_LOCK(hsai);

  /* Pause the audio file playing by disabling the SAI DMA requests */
  hsai->Instance->CR1 &= ~SAI_xCR1_DMAEN;

  /* Process Unlocked */
  __HAL_UNLOCK(hsai);

  return HAL_OK;
}

HAL_StatusTypeDef HAL_SAI_DMAResume(SAI_HandleTypeDef *hsai)
{
  /* Process Locked */
  __HAL_LOCK(hsai);

  /* Enable the SAI DMA requests */
  hsai->Instance->CR1 |= SAI_xCR1_DMAEN;

  /* If the SAI peripheral is still not enabled, enable it */
  if ((hsai->Instance->CR1 & SAI_xCR1_SAIEN) == RESET)
  {
    /* Enable SAI peripheral */
    __HAL_SAI_ENABLE(hsai);
  }

  /* Process Unlocked */
  __HAL_UNLOCK(hsai);

  return HAL_OK;
}

HAL_StatusTypeDef HAL_SAI_DMAStop(SAI_HandleTypeDef *hsai)
{
  /* Process Locked */
  __HAL_LOCK(hsai);

  /* Disable the SAI DMA request */
  hsai->Instance->CR1 &= ~SAI_xCR1_DMAEN;

  /* Abort the SAI DMA Streams */
  if(hsai->hdmatx != NULL)
  {
    if(HAL_DMA_Abort(hsai->hdmatx) != HAL_OK)
    {
      return HAL_ERROR;
    }
  }

  if(hsai->hdmarx != NULL)
  {
    if(HAL_DMA_Abort(hsai->hdmarx) != HAL_OK)
    {
      return HAL_ERROR;
    }
  }
  
  /* Disable SAI peripheral */
  SAI_Disable(hsai);

  hsai->State = HAL_SAI_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hsai);

  return HAL_OK;
}

HAL_StatusTypeDef HAL_SAI_Abort(SAI_HandleTypeDef *hsai)
{
  /* Process Locked */
  __HAL_LOCK(hsai);

  /* Check SAI DMA is enabled or not */
  if((hsai->Instance->CR1 & SAI_xCR1_DMAEN) == SAI_xCR1_DMAEN)
  {
    /* Disable the SAI DMA request */
    hsai->Instance->CR1 &= ~SAI_xCR1_DMAEN;
    
    /* Abort the SAI DMA Streams */
    if(hsai->hdmatx != NULL)
    {
      if(HAL_DMA_Abort(hsai->hdmatx) != HAL_OK)
      {
        return HAL_ERROR;
      }
    }

    if(hsai->hdmarx != NULL)
    {
      if(HAL_DMA_Abort(hsai->hdmarx) != HAL_OK)
      {
        return HAL_ERROR;
      }
    }
  }
  /* Disabled All interrupt and clear all the flag */
  hsai->Instance->IMR = 0;
  hsai->Instance->CLRFR = 0xFFFFFFFFU;

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

  /* Flush the fifo */
  SET_BIT(hsai->Instance->CR2, SAI_xCR2_FFLUSH);

  hsai->State = HAL_SAI_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hsai);

  return HAL_OK;
}

HAL_StatusTypeDef HAL_SAI_Transmit_DMA(SAI_HandleTypeDef *hsai, uint8_t *pData, uint16_t Size)
{
  if((pData == NULL) || (Size == 0))
  {
    return  HAL_ERROR;
  }

  if(hsai->State == HAL_SAI_STATE_READY)
  {
    /* Process Locked */
    __HAL_LOCK(hsai);

    hsai->pBuffPtr = pData;
    hsai->XferSize = Size;
    hsai->XferCount = Size;
    hsai->ErrorCode = HAL_SAI_ERROR_NONE;
    hsai->State = HAL_SAI_STATE_BUSY_TX;

    /* Set the SAI Tx DMA Half transfer complete callback */
    hsai->hdmatx->XferHalfCpltCallback = SAI_DMATxHalfCplt;

    /* Set the SAI TxDMA transfer complete callback */
    hsai->hdmatx->XferCpltCallback = SAI_DMATxCplt;

    /* Set the DMA error callback */
    hsai->hdmatx->XferErrorCallback = SAI_DMAError;

    /* Set the DMA Tx abort callback */
    hsai->hdmatx->XferAbortCallback = NULL;

    /* Enable the Tx DMA Stream */
    if(HAL_DMA_Start_IT(hsai->hdmatx, (uint32_t)hsai->pBuffPtr, (uint32_t)&hsai->Instance->DR, hsai->XferSize) != HAL_OK)
    {
      __HAL_UNLOCK(hsai);
      return  HAL_ERROR;
    }

    /* Check if the SAI is already enabled */
    if((hsai->Instance->CR1 & SAI_xCR1_SAIEN) == RESET)
    {
      /* Enable SAI peripheral */
      __HAL_SAI_ENABLE(hsai);
    }

    /* Enable the interrupts for error handling */
    __HAL_SAI_ENABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_DMA));

    /* Enable SAI Tx DMA Request */
    hsai->Instance->CR1 |= SAI_xCR1_DMAEN;

    /* Process Unlocked */
    __HAL_UNLOCK(hsai);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_SAI_Receive_DMA(SAI_HandleTypeDef *hsai, uint8_t *pData, uint16_t Size)
{

  if((pData == NULL) || (Size == 0))
  {
    return  HAL_ERROR;
  }

  if(hsai->State == HAL_SAI_STATE_READY)
  {
    /* Process Locked */
    __HAL_LOCK(hsai);

    hsai->pBuffPtr = pData;
    hsai->XferSize = Size;
    hsai->XferCount = Size;
    hsai->ErrorCode = HAL_SAI_ERROR_NONE;
    hsai->State = HAL_SAI_STATE_BUSY_RX;

    /* Set the SAI Rx DMA Half transfer complete callback */
    hsai->hdmarx->XferHalfCpltCallback = SAI_DMARxHalfCplt;

    /* Set the SAI Rx DMA transfer complete callback */
    hsai->hdmarx->XferCpltCallback = SAI_DMARxCplt;

    /* Set the DMA error callback */
    hsai->hdmarx->XferErrorCallback = SAI_DMAError;

    /* Set the DMA Rx abort callback */
    hsai->hdmarx->XferAbortCallback = NULL;

    /* Enable the Rx DMA Stream */
    if(HAL_DMA_Start_IT(hsai->hdmarx, (uint32_t)&hsai->Instance->DR, (uint32_t)hsai->pBuffPtr, hsai->XferSize) != HAL_OK)
    {
      __HAL_UNLOCK(hsai);
      return  HAL_ERROR;
    }

    /* Check if the SAI is already enabled */
    if((hsai->Instance->CR1 & SAI_xCR1_SAIEN) == RESET)
    {
      /* Enable SAI peripheral */
      __HAL_SAI_ENABLE(hsai);
    }

    /* Enable the interrupts for error handling */
    __HAL_SAI_ENABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_DMA));

    /* Enable SAI Rx DMA Request */
    hsai->Instance->CR1 |= SAI_xCR1_DMAEN;

    /* Process Unlocked */
    __HAL_UNLOCK(hsai);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_SAI_EnableTxMuteMode(SAI_HandleTypeDef *hsai, uint16_t val)
{
  assert_param(IS_SAI_BLOCK_MUTE_VALUE(val));

  if(hsai->State != HAL_SAI_STATE_RESET)
  {
    CLEAR_BIT(hsai->Instance->CR2, SAI_xCR2_MUTEVAL | SAI_xCR2_MUTE);
    SET_BIT(hsai->Instance->CR2, SAI_xCR2_MUTE | val);
    return HAL_OK;
  }
  return HAL_ERROR;
}

HAL_StatusTypeDef HAL_SAI_DisableTxMuteMode(SAI_HandleTypeDef *hsai)
{
  if(hsai->State != HAL_SAI_STATE_RESET)
  {
    CLEAR_BIT(hsai->Instance->CR2, SAI_xCR2_MUTEVAL | SAI_xCR2_MUTE);
    return HAL_OK;
  }
  return HAL_ERROR;
}

HAL_StatusTypeDef HAL_SAI_EnableRxMuteMode(SAI_HandleTypeDef *hsai, SAIcallback callback, uint16_t counter)
{
  assert_param(IS_SAI_BLOCK_MUTE_COUNTER(counter));

  if(hsai->State != HAL_SAI_STATE_RESET)
  {
    /* set the mute counter */
    CLEAR_BIT(hsai->Instance->CR2, SAI_xCR2_MUTECNT);
    SET_BIT(hsai->Instance->CR2, (uint32_t)((uint32_t)counter << SAI_xCR2_MUTECNT_OFFSET));
    hsai->mutecallback = callback;
    /* enable the IT interrupt */
    __HAL_SAI_ENABLE_IT(hsai, SAI_IT_MUTEDET);
    return HAL_OK;
  }
  return HAL_ERROR;
}

HAL_StatusTypeDef HAL_SAI_DisableRxMuteMode(SAI_HandleTypeDef *hsai)
{
  if(hsai->State != HAL_SAI_STATE_RESET)
  {
    /* set the mutecallback to NULL */
    hsai->mutecallback = (SAIcallback)NULL;
    /* enable the IT interrupt */
    __HAL_SAI_DISABLE_IT(hsai, SAI_IT_MUTEDET);
    return HAL_OK;
  }
  return HAL_ERROR;
}

void HAL_SAI_IRQHandler(SAI_HandleTypeDef *hsai)
{
  if(hsai->State != HAL_SAI_STATE_RESET)
  {
    uint32_t itflags = hsai->Instance->SR;
    uint32_t itsources = hsai->Instance->IMR;
    uint32_t cr1config = hsai->Instance->CR1;    
    uint32_t tmperror;

    /* SAI Fifo request interrupt occured ------------------------------------*/
    if(((itflags & SAI_xSR_FREQ) == SAI_xSR_FREQ) && ((itsources & SAI_IT_FREQ) == SAI_IT_FREQ))
    {
      hsai->InterruptServiceRoutine(hsai);
    }
    /* SAI Overrun error interrupt occurred ----------------------------------*/
    else if(((itflags & SAI_FLAG_OVRUDR) == SAI_FLAG_OVRUDR) && ((itsources & SAI_IT_OVRUDR) == SAI_IT_OVRUDR))
    {
      /* Clear the SAI Overrun flag */
      __HAL_SAI_CLEAR_FLAG(hsai, SAI_FLAG_OVRUDR);
      /* Get the SAI error code */
      tmperror = ((hsai->State == HAL_SAI_STATE_BUSY_RX) ? HAL_SAI_ERROR_OVR : HAL_SAI_ERROR_UDR);      
      /* Change the SAI error code */
      hsai->ErrorCode |= tmperror;
      /* the transfer is not stopped, we will forward the information to the user and we let the user decide what needs to be done */
      HAL_SAI_ErrorCallback(hsai);
    }
    /* SAI mutedet interrupt occurred ----------------------------------*/
    else if(((itflags & SAI_FLAG_MUTEDET) == SAI_FLAG_MUTEDET) && ((itsources & SAI_IT_MUTEDET) == SAI_IT_MUTEDET))
    {
      /* Clear the SAI mutedet flag */
      __HAL_SAI_CLEAR_FLAG(hsai, SAI_FLAG_MUTEDET);
      /* call the call back function */
      if(hsai->mutecallback != (SAIcallback)NULL)
      {
        /* inform the user that an RX mute event has been detected */
        hsai->mutecallback();
      }
    }
    /* SAI AFSDET interrupt occurred ----------------------------------*/
    else if(((itflags & SAI_FLAG_AFSDET) == SAI_FLAG_AFSDET) && ((itsources & SAI_IT_AFSDET) == SAI_IT_AFSDET))
    {
      /* Change the SAI error code */
      hsai->ErrorCode |= HAL_SAI_ERROR_AFSDET;
      /* Check SAI DMA is enabled or not */
      if((cr1config & SAI_xCR1_DMAEN) == SAI_xCR1_DMAEN)
      {
        /* Abort the SAI DMA Streams */
        if(hsai->hdmatx != NULL)
        {
          /* Set the DMA Tx abort callback */
          hsai->hdmatx->XferAbortCallback = SAI_DMAAbort;

          /* Abort DMA in IT mode */
          HAL_DMA_Abort_IT(hsai->hdmatx);
        }
        else if(hsai->hdmarx != NULL)
        {
          /* Set the DMA Rx abort callback */
          hsai->hdmarx->XferAbortCallback = SAI_DMAAbort;
          /* Abort DMA in IT mode */
          HAL_DMA_Abort_IT(hsai->hdmarx);
        }
      }
      else
      {
        /* Abort SAI */ 
        HAL_SAI_Abort(hsai);
        
        /* Set error callback */
        HAL_SAI_ErrorCallback(hsai);          
      }
    }
    /* SAI LFSDET interrupt occurred ----------------------------------*/
    else if(((itflags & SAI_FLAG_LFSDET) == SAI_FLAG_LFSDET) && ((itsources & SAI_IT_LFSDET) == SAI_IT_LFSDET))
    {
      /* Change the SAI error code */
      hsai->ErrorCode |= HAL_SAI_ERROR_LFSDET;

      /* Check SAI DMA is enabled or not */
      if((cr1config & SAI_xCR1_DMAEN) == SAI_xCR1_DMAEN)
      {
        /* Abort the SAI DMA Streams */
        if(hsai->hdmatx != NULL)
        {
          /* Set the DMA Tx abort callback */
          hsai->hdmatx->XferAbortCallback = SAI_DMAAbort; 
          /* Abort DMA in IT mode */
          HAL_DMA_Abort_IT(hsai->hdmatx);
        }
        else if(hsai->hdmarx != NULL)
        {
          /* Set the DMA Rx abort callback */
          hsai->hdmarx->XferAbortCallback = SAI_DMAAbort; 
          /* Abort DMA in IT mode */          
          HAL_DMA_Abort_IT(hsai->hdmarx);
        }
      }
      else
      {
        /* Abort SAI */ 
        HAL_SAI_Abort(hsai);
        
        /* Set error callback */
        HAL_SAI_ErrorCallback(hsai);
      }
    }
    /* SAI WCKCFG interrupt occurred ----------------------------------*/
    else if(((itflags & SAI_FLAG_WCKCFG) == SAI_FLAG_WCKCFG) && ((itsources & SAI_IT_WCKCFG) == SAI_IT_WCKCFG))
    {
      /* Change the SAI error code */
      hsai->ErrorCode |= HAL_SAI_ERROR_WCKCFG;

      /* Abort the SAI DMA Streams */
      if(hsai->hdmatx != NULL)
      {
        /* Set the DMA Tx abort callback */
        hsai->hdmatx->XferAbortCallback = SAI_DMAAbort; 
        /* Abort DMA in IT mode */
        HAL_DMA_Abort_IT(hsai->hdmatx);
      }
      else if(hsai->hdmarx != NULL)
      {
        /* Set the DMA Rx abort callback */
        hsai->hdmarx->XferAbortCallback = SAI_DMAAbort; 
        /* Abort DMA in IT mode */          
        HAL_DMA_Abort_IT(hsai->hdmarx);
      }
      else
      {
        /* If WCKCFG occurs, SAI audio block is automatically disabled */
        /* Disable all interrupts and clear all flags */
        hsai->Instance->IMR = 0U;
        hsai->Instance->CLRFR = 0xFFFFFFFFU;
        /* Set the SAI state to ready to be able to start again the process */
        hsai->State = HAL_SAI_STATE_READY;

        /* Initialize XferCount */
        hsai->XferCount = 0U;

        /* SAI error Callback */
        HAL_SAI_ErrorCallback(hsai);        
      }
    }
    /* SAI CNRDY interrupt occurred ----------------------------------*/
    else if(((itflags & SAI_FLAG_CNRDY) == SAI_FLAG_CNRDY) && ((itsources & SAI_IT_CNRDY) == SAI_IT_CNRDY))
    {
      /* Clear the SAI CNRDY flag */
      __HAL_SAI_CLEAR_FLAG(hsai, SAI_FLAG_CNRDY);
      /* Change the SAI error code */
      hsai->ErrorCode |= HAL_SAI_ERROR_CNREADY;
      /* the transfer is not stopped, we will forward the information to the user and we let the user decide what needs to be done */
      HAL_SAI_ErrorCallback(hsai);
    }
    else
    {
      /* Nothing to do */
    }
  }
}

__weak void HAL_SAI_TxCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_TxCpltCallback could be implemented in the user file
   */
}

 __weak void HAL_SAI_TxHalfCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_TxHalfCpltCallback could be implemented in the user file
   */
}

__weak void HAL_SAI_RxCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_RxCpltCallback could be implemented in the user file
   */
}

__weak void HAL_SAI_RxHalfCpltCallback(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_RxHalfCpltCallback could be implemented in the user file
   */
}

__weak void HAL_SAI_ErrorCallback(SAI_HandleTypeDef *hsai)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hsai);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_SAI_ErrorCallback could be implemented in the user file
   */
}

HAL_SAI_StateTypeDef HAL_SAI_GetState(SAI_HandleTypeDef *hsai)
{
  return hsai->State;
}

uint32_t HAL_SAI_GetError(SAI_HandleTypeDef *hsai)
{
  return hsai->ErrorCode;
}
static HAL_StatusTypeDef SAI_InitI2S(SAI_HandleTypeDef *hsai, uint32_t protocol, uint32_t datasize, uint32_t nbslot)
{
  hsai->Init.Protocol            = SAI_FREE_PROTOCOL;
  hsai->Init.FirstBit            = SAI_FIRSTBIT_MSB;
  /* Compute ClockStrobing according AudioMode */
  if((hsai->Init.AudioMode == SAI_MODEMASTER_TX) || (hsai->Init.AudioMode == SAI_MODESLAVE_TX))
  { /* Transmit */
    hsai->Init.ClockStrobing     = SAI_CLOCKSTROBING_FALLINGEDGE;
  }
  else
  { /* Receive */
    hsai->Init.ClockStrobing     = SAI_CLOCKSTROBING_RISINGEDGE;
  }
  hsai->FrameInit.FSDefinition   = SAI_FS_CHANNEL_IDENTIFICATION;
  hsai->SlotInit.SlotActive      = SAI_SLOTACTIVE_ALL;
  hsai->SlotInit.FirstBitOffset  = 0;
  hsai->SlotInit.SlotNumber      = nbslot;

  /* in IS2 the number of slot must be even */
  if((nbslot & 0x1) != 0 )
  {
    return HAL_ERROR;
  }

  switch(protocol)
  {
  case SAI_I2S_STANDARD :
    hsai->FrameInit.FSPolarity = SAI_FS_ACTIVE_LOW;
    hsai->FrameInit.FSOffset   = SAI_FS_BEFOREFIRSTBIT;
    break;
  case SAI_I2S_MSBJUSTIFIED :
  case SAI_I2S_LSBJUSTIFIED :
    hsai->FrameInit.FSPolarity = SAI_FS_ACTIVE_HIGH;
    hsai->FrameInit.FSOffset   = SAI_FS_FIRSTBIT;
    break;
  default :
    return HAL_ERROR;
  }

  /* Frame definition */
  switch(datasize)
  {
  case SAI_PROTOCOL_DATASIZE_16BIT:
    hsai->Init.DataSize = SAI_DATASIZE_16;
    hsai->FrameInit.FrameLength = 32*(nbslot/2);
    hsai->FrameInit.ActiveFrameLength = 16*(nbslot/2);
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_16B;
    break;
  case SAI_PROTOCOL_DATASIZE_16BITEXTENDED :
    hsai->Init.DataSize = SAI_DATASIZE_16;
    hsai->FrameInit.FrameLength = 64*(nbslot/2);
    hsai->FrameInit.ActiveFrameLength = 32*(nbslot/2);
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_32B;
    break;
  case SAI_PROTOCOL_DATASIZE_24BIT:
    hsai->Init.DataSize = SAI_DATASIZE_24;
    hsai->FrameInit.FrameLength = 64*(nbslot/2);
    hsai->FrameInit.ActiveFrameLength = 32*(nbslot/2);
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_32B;
    break;
  case SAI_PROTOCOL_DATASIZE_32BIT:
    hsai->Init.DataSize = SAI_DATASIZE_32;
    hsai->FrameInit.FrameLength = 64*(nbslot/2);
    hsai->FrameInit.ActiveFrameLength = 32*(nbslot/2);
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_32B;
    break;
  default :
    return HAL_ERROR;
  }
  if(protocol == SAI_I2S_LSBJUSTIFIED)
  {
    if (datasize == SAI_PROTOCOL_DATASIZE_16BITEXTENDED)
    {
      hsai->SlotInit.FirstBitOffset = 16;
    }
    if (datasize == SAI_PROTOCOL_DATASIZE_24BIT)
    {
      hsai->SlotInit.FirstBitOffset = 8;
    }
  }
  return HAL_OK;
}

static HAL_StatusTypeDef SAI_InitPCM(SAI_HandleTypeDef *hsai, uint32_t protocol, uint32_t datasize, uint32_t nbslot)
{
  hsai->Init.Protocol            = SAI_FREE_PROTOCOL;
  hsai->Init.FirstBit            = SAI_FIRSTBIT_MSB;
  /* Compute ClockStrobing according AudioMode */
  if((hsai->Init.AudioMode == SAI_MODEMASTER_TX) || (hsai->Init.AudioMode == SAI_MODESLAVE_TX))
  { /* Transmit */
    hsai->Init.ClockStrobing     = SAI_CLOCKSTROBING_RISINGEDGE;
  }
  else
  { /* Receive */
    hsai->Init.ClockStrobing     = SAI_CLOCKSTROBING_FALLINGEDGE;
  }
  hsai->FrameInit.FSDefinition   = SAI_FS_STARTFRAME;
  hsai->FrameInit.FSPolarity     = SAI_FS_ACTIVE_HIGH;
  hsai->FrameInit.FSOffset       = SAI_FS_BEFOREFIRSTBIT;
  hsai->SlotInit.FirstBitOffset  = 0;
  hsai->SlotInit.SlotNumber      = nbslot;
  hsai->SlotInit.SlotActive      = SAI_SLOTACTIVE_ALL;

  switch(protocol)
  {
  case SAI_PCM_SHORT :
    hsai->FrameInit.ActiveFrameLength = 1;
    break;
  case SAI_PCM_LONG :
    hsai->FrameInit.ActiveFrameLength = 13;
    break;
  default :
    return HAL_ERROR;
  }

  switch(datasize)
  {
  case SAI_PROTOCOL_DATASIZE_16BIT:
    hsai->Init.DataSize = SAI_DATASIZE_16;
    hsai->FrameInit.FrameLength = 16 * nbslot;
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_16B;
    break;
  case SAI_PROTOCOL_DATASIZE_16BITEXTENDED :
    hsai->Init.DataSize = SAI_DATASIZE_16;
    hsai->FrameInit.FrameLength = 32 * nbslot;
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_32B;
    break;
  case SAI_PROTOCOL_DATASIZE_24BIT :
    hsai->Init.DataSize = SAI_DATASIZE_24;
    hsai->FrameInit.FrameLength = 32 * nbslot;
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_32B;
    break;
  case SAI_PROTOCOL_DATASIZE_32BIT:
    hsai->Init.DataSize = SAI_DATASIZE_32;
    hsai->FrameInit.FrameLength = 32 * nbslot;
    hsai->SlotInit.SlotSize = SAI_SLOTSIZE_32B;
    break;
  default :
    return HAL_ERROR;
  }

  return HAL_OK;
}

static void SAI_FillFifo(SAI_HandleTypeDef *hsai)
{
  /* fill the fifo with data before to enabled the SAI */
  while(((hsai->Instance->SR & SAI_xSR_FLVL) != SAI_FIFOSTATUS_FULL) && (hsai->XferCount > 0))
  {
    if((hsai->Init.DataSize == SAI_DATASIZE_8) && (hsai->Init.CompandingMode == SAI_NOCOMPANDING))
    {
      hsai->Instance->DR = (*hsai->pBuffPtr++);
    }
    else if(hsai->Init.DataSize <= SAI_DATASIZE_16)
    {
      hsai->Instance->DR = *((uint32_t *)hsai->pBuffPtr);
      hsai->pBuffPtr+= 2;
    }
    else
    {
      hsai->Instance->DR = *((uint32_t *)hsai->pBuffPtr);
      hsai->pBuffPtr+= 4;
    }
    hsai->XferCount--;
  }
}

static uint32_t SAI_InterruptFlag(SAI_HandleTypeDef *hsai, uint32_t mode)
{
  uint32_t tmpIT = SAI_IT_OVRUDR;
  
  if(mode == SAI_MODE_IT)
  {
    tmpIT|= SAI_IT_FREQ;
  }

  if((hsai->Init.Protocol == SAI_AC97_PROTOCOL) &&
    ((hsai->Init.AudioMode == SAI_MODESLAVE_RX) || (hsai->Init.AudioMode == SAI_MODEMASTER_RX)))
  {
    tmpIT|= SAI_IT_CNRDY;
  }

  if((hsai->Init.AudioMode == SAI_MODESLAVE_RX) || (hsai->Init.AudioMode == SAI_MODESLAVE_TX))
  {
    tmpIT|= SAI_IT_AFSDET | SAI_IT_LFSDET;
  }
  else
  {
    /* hsai has been configured in master mode */
    tmpIT|= SAI_IT_WCKCFG;
  }
  return tmpIT;
}

static HAL_StatusTypeDef SAI_Disable(SAI_HandleTypeDef *hsai)
{
  register uint32_t count = SAI_DEFAULT_TIMEOUT * (SystemCoreClock /7/1000);
  HAL_StatusTypeDef status = HAL_OK;

  /* Disable the SAI instance */
  __HAL_SAI_DISABLE(hsai);

  do 
  {
    /* Check for the Timeout */
    if (count-- == 0)
    {         
      /* Update error code */
      hsai->ErrorCode |= HAL_SAI_ERROR_TIMEOUT;
      status = HAL_TIMEOUT;
      break;
    }
  } while((hsai->Instance->CR1 & SAI_xCR1_SAIEN) != RESET);

  return status;
}

static void SAI_Transmit_IT8Bit(SAI_HandleTypeDef *hsai)
{
  if(hsai->XferCount == 0)
  {
    /* Handle the end of the transmission */
    /* Disable FREQ and OVRUDR interrupts */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));
    hsai->State = HAL_SAI_STATE_READY;
    HAL_SAI_TxCpltCallback(hsai);
  }
  else
  {
    /* Write data on DR register */
    hsai->Instance->DR = (*hsai->pBuffPtr++);
    hsai->XferCount--;
  }
}

static void SAI_Transmit_IT16Bit(SAI_HandleTypeDef *hsai)
{
  if(hsai->XferCount == 0)
  {
    /* Handle the end of the transmission */
    /* Disable FREQ and OVRUDR interrupts */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));
    hsai->State = HAL_SAI_STATE_READY;
    HAL_SAI_TxCpltCallback(hsai);
  }
  else
  {
    /* Write data on DR register */
    hsai->Instance->DR = *(uint16_t *)hsai->pBuffPtr;
    hsai->pBuffPtr+=2;
    hsai->XferCount--;
  }
}

static void SAI_Transmit_IT32Bit(SAI_HandleTypeDef *hsai)
{
  if(hsai->XferCount == 0)
  {
    /* Handle the end of the transmission */
    /* Disable FREQ and OVRUDR interrupts */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));
    hsai->State = HAL_SAI_STATE_READY;
    HAL_SAI_TxCpltCallback(hsai);
  }
  else
  {
    /* Write data on DR register */
    hsai->Instance->DR = *(uint32_t *)hsai->pBuffPtr;
    hsai->pBuffPtr+=4;
    hsai->XferCount--;
  }
}

static void SAI_Receive_IT8Bit(SAI_HandleTypeDef *hsai)
{
  /* Receive data */
  (*hsai->pBuffPtr++) = hsai->Instance->DR;
  hsai->XferCount--;

  /* Check end of the transfer */
  if(hsai->XferCount == 0)
  {
    /* Disable TXE and OVRUDR interrupts */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));

    /* Clear the SAI Overrun flag */
    __HAL_SAI_CLEAR_FLAG(hsai, SAI_FLAG_OVRUDR);
    
    hsai->State = HAL_SAI_STATE_READY;
    HAL_SAI_RxCpltCallback(hsai);
  }
}

static void SAI_Receive_IT16Bit(SAI_HandleTypeDef *hsai)
{
  /* Receive data */
  *(uint16_t*)hsai->pBuffPtr = hsai->Instance->DR;
  hsai->pBuffPtr+=2;
  hsai->XferCount--;

  /* Check end of the transfer */
  if(hsai->XferCount == 0)
  {
    /* Disable TXE and OVRUDR interrupts */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));

    /* Clear the SAI Overrun flag */
    __HAL_SAI_CLEAR_FLAG(hsai, SAI_FLAG_OVRUDR);

    hsai->State = HAL_SAI_STATE_READY;
    HAL_SAI_RxCpltCallback(hsai);
  }
}
static void SAI_Receive_IT32Bit(SAI_HandleTypeDef *hsai)
{
  /* Receive data */
  *(uint32_t*)hsai->pBuffPtr = hsai->Instance->DR;
  hsai->pBuffPtr+=4;
  hsai->XferCount--;

  /* Check end of the transfer */
  if(hsai->XferCount == 0)
  {
    /* Disable TXE and OVRUDR interrupts */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_IT));
    
    /* Clear the SAI Overrun flag */
    __HAL_SAI_CLEAR_FLAG(hsai, SAI_FLAG_OVRUDR);

    hsai->State = HAL_SAI_STATE_READY;
    HAL_SAI_RxCpltCallback(hsai);
  }
}

static void SAI_DMATxCplt(DMA_HandleTypeDef *hdma)
{
  SAI_HandleTypeDef* hsai = (SAI_HandleTypeDef*)((DMA_HandleTypeDef* )hdma)->Parent;

  if((hdma->Instance->CR & DMA_SxCR_CIRC) == 0)
  {
    hsai->XferCount = 0;
    
    /* Disable SAI Tx DMA Request */
    hsai->Instance->CR1 &= (uint32_t)(~SAI_xCR1_DMAEN);

    /* Stop the interrupts error handling */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_DMA));
    
    hsai->State= HAL_SAI_STATE_READY;
  }
  HAL_SAI_TxCpltCallback(hsai);
}

static void SAI_DMATxHalfCplt(DMA_HandleTypeDef *hdma)
{
  SAI_HandleTypeDef* hsai = (SAI_HandleTypeDef*)((DMA_HandleTypeDef*)hdma)->Parent;

  HAL_SAI_TxHalfCpltCallback(hsai);
}

static void SAI_DMARxCplt(DMA_HandleTypeDef *hdma)
{
  SAI_HandleTypeDef* hsai = ( SAI_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
  if((hdma->Instance->CR & DMA_SxCR_CIRC) == 0)
  {
    /* Disable Rx DMA Request */
    hsai->Instance->CR1 &= (uint32_t)(~SAI_xCR1_DMAEN);
    hsai->XferCount = 0;

    /* Stop the interrupts error handling */
    __HAL_SAI_DISABLE_IT(hsai, SAI_InterruptFlag(hsai, SAI_MODE_DMA));
    
    hsai->State = HAL_SAI_STATE_READY;
  }
  HAL_SAI_RxCpltCallback(hsai);
}

static void SAI_DMARxHalfCplt(DMA_HandleTypeDef *hdma)
{
  SAI_HandleTypeDef* hsai = (SAI_HandleTypeDef*)((DMA_HandleTypeDef*)hdma)->Parent;

  HAL_SAI_RxHalfCpltCallback(hsai);
}
static void SAI_DMAError(DMA_HandleTypeDef *hdma)
{
  SAI_HandleTypeDef* hsai = ( SAI_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;

  /* Set SAI error code */
  hsai->ErrorCode |= HAL_SAI_ERROR_DMA;

  if((hsai->hdmatx->ErrorCode == HAL_DMA_ERROR_TE) || (hsai->hdmarx->ErrorCode == HAL_DMA_ERROR_TE))
  {
    /* Disable the SAI DMA request */
    hsai->Instance->CR1 &= ~SAI_xCR1_DMAEN;

    /* Disable SAI peripheral */
    SAI_Disable(hsai);
    
    /* Set the SAI state ready to be able to start again the process */
    hsai->State = HAL_SAI_STATE_READY;

    /* Initialize XferCount */
    hsai->XferCount = 0U;
  }
  /* SAI error Callback */ 
  HAL_SAI_ErrorCallback(hsai);
}

static void SAI_DMAAbort(DMA_HandleTypeDef *hdma)   
{
  SAI_HandleTypeDef* hsai = ( SAI_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
  
  /* Disable DMA request */
  hsai->Instance->CR1 &= ~SAI_xCR1_DMAEN;

  /* Disable all interrupts and clear all flags */
  hsai->Instance->IMR = 0U;
  hsai->Instance->CLRFR = 0xFFFFFFFFU;
  
  if(hsai->ErrorCode != HAL_SAI_ERROR_WCKCFG)
  {
    /* Disable SAI peripheral */
    SAI_Disable(hsai);

    /* Flush the fifo */
    SET_BIT(hsai->Instance->CR2, SAI_xCR2_FFLUSH);
  }
  /* Set the SAI state to ready to be able to start again the process */
  hsai->State = HAL_SAI_STATE_READY;
  
  /* Initialize XferCount */
  hsai->XferCount = 0U;  

  /* SAI error Callback */ 
  HAL_SAI_ErrorCallback(hsai);
}

#endif /* HAL_SAI_MODULE_ENABLED */

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