* Function Name  : I2S_StructInit
* Description    : Fills each I2S_InitStruct member with its default value.
* Input          : - I2S_InitStruct : pointer to a I2S_InitTypeDef structure
*                    which will be initialized.
* Output         : None
* Return         : None
*******************************************************************************/
void I2S_StructInit(I2S_InitTypeDef* I2S_InitStruct)
{
/*--------------- Reset I2S init structure parameters values -----------------*/
  /* Initialize the I2S_Mode member */
  I2S_InitStruct->I2S_Mode = I2S_Mode_SlaveTx;
  
  /* Initialize the I2S_Standard member */
  I2S_InitStruct->I2S_Standard = I2S_Standard_Phillips;
  
  /* Initialize the I2S_DataFormat member */
  I2S_InitStruct->I2S_DataFormat = I2S_DataFormat_16b;
  
  /* Initialize the I2S_MCLKOutput member */
  I2S_InitStruct->I2S_MCLKOutput = I2S_MCLKOutput_Disable;
  
  /* Initialize the I2S_AudioFreq member */
  I2S_InitStruct->I2S_AudioFreq = I2S_AudioFreq_Default;
  
  /* Initialize the I2S_CPOL member */
  I2S_InitStruct->I2S_CPOL = I2S_CPOL_Low;
}

/*******************************************************************************
* Function Name  : SPI_Cmd
* Description    : Enables or disables the specified SPI peripheral.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
*                  - NewState: new state of the SPIx peripheral. 
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI peripheral */
    SPIx->CR1 |= CR1_SPE_Set;
  }
  else
  {
    /* Disable the selected SPI peripheral */
    SPIx->CR1 &= CR1_SPE_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2S_Cmd
* Description    : Enables or disables the specified SPI peripheral (in I2S mode).
* Input          : - SPIx: where x can be 2 or 3 to select the SPI peripheral.
*                  - NewState: new state of the SPIx peripheral. 
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2S_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_23_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI peripheral (in I2S mode) */
    SPIx->I2SCFGR |= I2SCFGR_I2SE_Set;
  }
  else
  {
    /* Disable the selected SPI peripheral (in I2S mode) */
    SPIx->I2SCFGR &= I2SCFGR_I2SE_Reset;
  }
}

/*******************************************************************************
* Function Name  : SPI_I2S_ITConfig
* Description    : Enables or disables the specified SPI/I2S interrupts.
* Input          : - SPIx: where x can be :
*                         - 1, 2 or 3 in SPI mode 
*                         - 2 or 3 in I2S mode
*                  - SPI_I2S_IT: specifies the SPI/I2S interrupt source to be 
*                    enabled or disabled. 
*                    This parameter can be one of the following values:
*                       - SPI_I2S_IT_TXE: Tx buffer empty interrupt mask
*                       - SPI_I2S_IT_RXNE: Rx buffer not empty interrupt mask
*                       - SPI_I2S_IT_ERR: Error interrupt mask
*                  - NewState: new state of the specified SPI/I2S interrupt.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, u8 SPI_I2S_IT, FunctionalState NewState)
{
  u16 itpos = 0, itmask = 0 ;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_SPI_I2S_CONFIG_IT(SPI_I2S_IT));

  /* Get the SPI/I2S IT index */
  itpos = SPI_I2S_IT >> 4;
  /* Set the IT mask */
  itmask = (u16)((u16)1 << itpos);

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI/I2S interrupt */
    SPIx->CR2 |= itmask;
  }
  else
  {
    /* Disable the selected SPI/I2S interrupt */
    SPIx->CR2 &= (u16)~itmask;
  }
}

/*******************************************************************************
* Function Name  : SPI_I2S_DMACmd
* Description    : Enables or disables the SPIx/I2Sx DMA interface.
* Input          : - SPIx: where x can be :
*                         - 1, 2 or 3 in SPI mode 
*                         - 2 or 3 in I2S mode
*                  - SPI_I2S_DMAReq: specifies the SPI/I2S DMA transfer request 
*                    to be enabled or disabled. 
*                    This parameter can be any combination of the following values:
*                       - SPI_I2S_DMAReq_Tx: Tx buffer DMA transfer request
*                       - SPI_I2S_DMAReq_Rx: Rx buffer DMA transfer request
*                  - NewState: new state of the selected SPI/I2S DMA transfer 
*                    request.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, u16 SPI_I2S_DMAReq, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_SPI_I2S_DMAREQ(SPI_I2S_DMAReq));

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI/I2S DMA requests */
    SPIx->CR2 |= SPI_I2S_DMAReq;
  }
  else
  {
    /* Disable the selected SPI/I2S DMA requests */
    SPIx->CR2 &= (u16)~SPI_I2S_DMAReq;
  }
}

/*******************************************************************************
* Function Name  : SPI_I2S_SendData
* Description    : Transmits a Data through the SPIx/I2Sx peripheral.
* Input          : - SPIx: where x can be :
*                         - 1, 2 or 3 in SPI mode 
*                         - 2 or 3 in I2S mode
*                  - Data : Data to be transmitted..
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_I2S_SendData(SPI_TypeDef* SPIx, u16 Data)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  
  /* Write in the DR register the data to be sent */
  SPIx->DR = Data;
}

/*******************************************************************************
* Function Name  : SPI_I2S_ReceiveData
* Description    : Returns the most recent received data by the SPIx/I2Sx peripheral. 
* Input          : - SPIx: where x can be :
*                         - 1, 2 or 3 in SPI mode 
*                         - 2 or 3 in I2S mode
* Output         : None
* Return         : The value of the received data.
*******************************************************************************/
u16 SPI_I2S_ReceiveData(SPI_TypeDef* SPIx)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  
  /* Return the data in the DR register */
  return SPIx->DR;
}

/*******************************************************************************
* Function Name  : SPI_NSSInternalSoftwareConfig
* Description    : Configures internally by software the NSS pin for the selected 
*                  SPI.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
*                  - SPI_NSSInternalSoft: specifies the SPI NSS internal state.
*                    This parameter can be one of the following values:
*                       - SPI_NSSInternalSoft_Set: Set NSS pin internally
*                       - SPI_NSSInternalSoft_Reset: Reset NSS pin internally
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_NSSInternalSoftwareConfig(SPI_TypeDef* SPIx, u16 SPI_NSSInternalSoft)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_NSS_INTERNAL(SPI_NSSInternalSoft));

  if (SPI_NSSInternalSoft != SPI_NSSInternalSoft_Reset)
  {
    /* Set NSS pin internally by software */
    SPIx->CR1 |= SPI_NSSInternalSoft_Set;
  }
  else
  {
    /* Reset NSS pin internally by software */
    SPIx->CR1 &= SPI_NSSInternalSoft_Reset;
  }
}

/*******************************************************************************
* Function Name  : SPI_SSOutputCmd
* Description    : Enables or disables the SS output for the selected SPI.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
*                  - NewState: new state of the SPIx SS output. 
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_SSOutputCmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI SS output */
    SPIx->CR2 |= CR2_SSOE_Set;
  }
  else
  {
    /* Disable the selected SPI SS output */
    SPIx->CR2 &= CR2_SSOE_Reset;
  }
}

/*******************************************************************************
* Function Name  : SPI_DataSizeConfig
* Description    : Configures the data size for the selected SPI.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
*                  - SPI_DataSize: specifies the SPI data size.
*                    This parameter can be one of the following values:
*                       - SPI_DataSize_16b: Set data frame format to 16bit
*                       - SPI_DataSize_8b: Set data frame format to 8bit
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_DataSizeConfig(SPI_TypeDef* SPIx, u16 SPI_DataSize)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_DATASIZE(SPI_DataSize));

  /* Clear DFF bit */
  SPIx->CR1 &= (u16)~SPI_DataSize_16b;
  /* Set new DFF bit value */
  SPIx->CR1 |= SPI_DataSize;
}

/*******************************************************************************
* Function Name  : SPI_TransmitCRC
* Description    : Transmit the SPIx CRC value.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_TransmitCRC(SPI_TypeDef* SPIx)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  
  /* Enable the selected SPI CRC transmission */
  SPIx->CR1 |= CR1_CRCNext_Set;
}

/*******************************************************************************
* Function Name  : SPI_CalculateCRC