* Description    : Enables or disables the CRC value calculation of the
*                  transfered bytes.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
*                  - NewState: new state of the SPIx CRC value calculation.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_CalculateCRC(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 CRC calculation */
    SPIx->CR1 |= CR1_CRCEN_Set;
  }
  else
  {
    /* Disable the selected SPI CRC calculation */
    SPIx->CR1 &= CR1_CRCEN_Reset;
  }
}

/*******************************************************************************
* Function Name  : SPI_GetCRC
* Description    : Returns the transmit or the receive CRC register value for
*                  the specified SPI.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
*                  - SPI_CRC: specifies the CRC register to be read.
*                    This parameter can be one of the following values:
*                       - SPI_CRC_Tx: Selects Tx CRC register
*                       - SPI_CRC_Rx: Selects Rx CRC register
* Output         : None
* Return         : The selected CRC register value..
*******************************************************************************/
u16 SPI_GetCRC(SPI_TypeDef* SPIx, u8 SPI_CRC)
{
  u16 crcreg = 0;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_CRC(SPI_CRC));

  if (SPI_CRC != SPI_CRC_Rx)
  {
    /* Get the Tx CRC register */
    crcreg = SPIx->TXCRCR;
  }
  else
  {
    /* Get the Rx CRC register */
    crcreg = SPIx->RXCRCR;
  }

  /* Return the selected CRC register */
  return crcreg;
}

/*******************************************************************************
* Function Name  : SPI_GetCRCPolynomial
* Description    : Returns the CRC Polynomial register value for the specified SPI.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
* Output         : None
* Return         : The CRC Polynomial register value.
*******************************************************************************/
u16 SPI_GetCRCPolynomial(SPI_TypeDef* SPIx)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  
  /* Return the CRC polynomial register */
  return SPIx->CRCPR;
}

/*******************************************************************************
* Function Name  : SPI_BiDirectionalLineConfig
* Description    : Selects the data transfer direction in bi-directional mode
*                  for the specified SPI.
* Input          : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
*                  - SPI_Direction: specifies the data transfer direction in
*                    bi-directional mode. 
*                    This parameter can be one of the following values:
*                       - SPI_Direction_Tx: Selects Tx transmission direction
*                       - SPI_Direction_Rx: Selects Rx receive direction
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_BiDirectionalLineConfig(SPI_TypeDef* SPIx, u16 SPI_Direction)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_DIRECTION(SPI_Direction));

  if (SPI_Direction == SPI_Direction_Tx)
  {
    /* Set the Tx only mode */
    SPIx->CR1 |= SPI_Direction_Tx;
  }
  else
  {
    /* Set the Rx only mode */
    SPIx->CR1 &= SPI_Direction_Rx;
  }
}

/*******************************************************************************
* Function Name  : SPI_I2S_GetFlagStatus
* Description    : Checks whether the specified SPI/I2S flag is set or not.
* Input          : - SPIx: where x can be :
*                         - 1, 2 or 3 in SPI mode 
*                         - 2 or 3 in I2S mode
*                  - SPI_I2S_FLAG: specifies the SPI/I2S flag to check. 
*                    This parameter can be one of the following values:
*                       - SPI_I2S_FLAG_TXE: Transmit buffer empty flag.
*                       - SPI_I2S_FLAG_RXNE: Receive buffer not empty flag.
*                       - SPI_I2S_FLAG_BSY: Busy flag.
*                       - SPI_I2S_FLAG_OVR: Overrun flag.
*                       - SPI_FLAG_MODF: Mode Fault flag.
*                       - SPI_FLAG_CRCERR: CRC Error flag.
*                       - I2S_FLAG_UDR: Underrun Error flag.
*                       - I2S_FLAG_CHSIDE: Channel Side flag.
* Output         : None
* Return         : The new state of SPI_I2S_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, u16 SPI_I2S_FLAG)
{
  FlagStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_I2S_GET_FLAG(SPI_I2S_FLAG));

  /* Check the status of the specified SPI/I2S flag */
  if ((SPIx->SR & SPI_I2S_FLAG) != (u16)RESET)
  {
    /* SPI_I2S_FLAG is set */
    bitstatus = SET;
  }
  else
  {
    /* SPI_I2S_FLAG is reset */
    bitstatus = RESET;
  }
  /* Return the SPI_I2S_FLAG status */
  return  bitstatus;
}

/*******************************************************************************
* Function Name  : SPI_I2S_ClearFlag
* Description    : Clears the SPIx/I2Sx pending flags.
* Input          : - SPIx: where x can be :
*                         - 1, 2 or 3 in SPI mode 
*                         - 2 or 3 in I2S mode
*                  - SPI_I2S_FLAG: specifies the SPI/I2S flag to clear. 
*                    This parameter can be one of the following values:
*                       - SPI_I2S_FLAG_OVR: Overrun flag 
*                       - SPI_FLAG_MODF: Mode Fault flag.
*                       - SPI_FLAG_CRCERR: CRC Error flag.
*                       - I2S_FLAG_UDR: Underrun Error flag.
*                    Note: Before clearing OVR flag, it is mandatory to read 
*                          SPI_I2S_DR register, so that the last data is not lost.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, u16 SPI_I2S_FLAG)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_I2S_CLEAR_FLAG(SPI_I2S_FLAG));
    
  /* SPI_FLAG_MODF flag clear */
  if(SPI_I2S_FLAG == SPI_FLAG_MODF)
  {
    /* Read SR register */
    (void)SPIx->SR;
    
    /* Write on CR1 register */
    SPIx->CR1 |= CR1_SPE_Set; 
  }
  /* SPI_I2S_FLAG_OVR flag or I2S_FLAG_UDR flag clear */
  else if ((SPI_I2S_FLAG == SPI_I2S_FLAG_OVR) || (SPI_I2S_FLAG == I2S_FLAG_UDR))  
  {
    /* Read SR register  (Before clearing OVR flag, it is mandatory to read 
       SPI_I2S_DR register)*/
    (void)SPIx->SR;
  }
  else /* SPI_FLAG_CRCERR flag clear */
  {
    /* Clear the selected SPI flag */
    SPIx->SR = (u16)~SPI_I2S_FLAG;
  }
}

/*******************************************************************************
* Function Name  : SPI_I2S_GetITStatus
* Description    : Checks whether the specified SPI/I2S interrupt has occurred or not.
* 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 check. 
*                    This parameter can be one of the following values:
*                       - SPI_I2S_IT_TXE: Transmit buffer empty interrupt.
*                       - SPI_I2S_IT_RXNE: Receive buffer not empty interrupt.
*                       - SPI_I2S_IT_OVR: Overrun interrupt.
*                       - SPI_IT_MODF: Mode Fault interrupt.
*                       - SPI_IT_CRCERR: CRC Error interrupt.
*                       - I2S_IT_UDR: Underrun Error interrupt.
* Output         : None
* Return         : The new state of SPI_I2S_IT (SET or RESET).
*******************************************************************************/
ITStatus SPI_I2S_GetITStatus(SPI_TypeDef* SPIx, u8 SPI_I2S_IT)
{
  ITStatus bitstatus = RESET;
  u16 itpos = 0, itmask = 0, enablestatus = 0;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_I2S_GET_IT(SPI_I2S_IT));

  /* Get the SPI/I2S IT index */
  itpos = (u16)((u16)0x01 << (SPI_I2S_IT & (u8)0x0F));

  /* Get the SPI/I2S IT mask */
  itmask = SPI_I2S_IT >> 4;
  /* Set the IT mask */
  itmask = (u16)((u16)0x01 << itmask);
  /* Get the SPI_I2S_IT enable bit status */
  enablestatus = (SPIx->CR2 & itmask) ;

  /* Check the status of the specified SPI/I2S interrupt */
  if (((SPIx->SR & itpos) != (u16)RESET) && enablestatus)
  {
    /* SPI_I2S_IT is set */
    bitstatus = SET;
  }
  else
  {
    /* SPI_I2S_IT is reset */
    bitstatus = RESET;
  }
  /* Return the SPI_I2S_IT status */
  return bitstatus;
}

/*******************************************************************************
* Function Name  : SPI_I2S_ClearITPendingBit
* Description    : Clears the SPIx/I2Sx interrupt pending bits.
* 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 pending bit to clear.
*                    This parameter can be one of the following values:
*                       - SPI_I2S_IT_OVR: Overrun interrupt.
*                       - SPI_IT_MODF: Mode Fault interrupt.
*                       - SPI_IT_CRCERR: CRC Error interrupt.
*                       - I2S_IT_UDR: Underrun Error interrupt.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, u8 SPI_I2S_IT)
{
  u16 itpos = 0;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_I2S_CLEAR_IT(SPI_I2S_IT));

  /* SPI_IT_MODF pending bit clear */
  if(SPI_I2S_IT == SPI_IT_MODF)
  {
    /* Read SR register */
    (void)SPIx->SR;
    /* Write on CR1 register */
    SPIx->CR1 |= CR1_SPE_Set; 
  }
  /* SPI_I2S_IT_OVR or I2S_IT_UDR pending bit clear */ 
  else if((SPI_I2S_IT == SPI_I2S_IT_OVR) || (SPI_I2S_IT == I2S_IT_UDR))    
  {
    /* Read SR register */
    (void)(SPIx->SR);
  }  
  else   /* SPI_IT_CRCERR pending bit clear */
  {
    /* Get the SPI/I2S IT index */
    itpos = (u16)((u16)0x01 << (SPI_I2S_IT & (u8)0x0F));
    /* Clear the selected SPI/I2S interrupt pending bits */
    SPIx->SR = (u16)~itpos;
  }
}

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/