stm32f10x_spi.c

STM32下做的usb转RS232程序

* Output         : None
* Return         : None
*******************************************************************************/
void SPI_SSOutputCmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  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 or 2 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_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 or 2 to select the SPI peripheral.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_TransmitCRC(SPI_TypeDef* SPIx)
{
  /* Enable the selected SPI CRC transmission */
  SPIx->CR1 |= CR1_CRCNext_Set;
}

/*******************************************************************************
* Function Name  : SPI_CalculateCRC
* Description    : Enables or disables the CRC value calculation of the
*                  transfered bytes.
* Input          : - SPIx: where x can be 1 or 2 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_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 or 2 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_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 or 2 to select the SPI peripheral.
* Output         : None
* Return         : The CRC Polynomial register value.
*******************************************************************************/
u16 SPI_GetCRCPolynomial(SPI_TypeDef* 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 or 2 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_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_GetFlagStatus
* Description    : Checks whether the specified SPI flag is set or not.
* Input          : - SPIx: where x can be 1 or 2 to select the SPI peripheral.
*                  - SPI_FLAG: specifies the flag to check. 
*                    This parameter can be one of the following values:
*                       - SPI_FLAG_BSY: Busy flag.
*                       - SPI_FLAG_OVR: Overrun flag.
*                       - SPI_FLAG_MODF: Mode Fault flag.
*                       - SPI_FLAG_CRCERR: CRC Error flag.
*                       - SPI_FLAG_TXE: Transmit buffer empty flag.
*                       - SPI_FLAG_RXNE: Receive buffer not empty flag.
* Output         : None
* Return         : The new state of SPI_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus SPI_GetFlagStatus(SPI_TypeDef* SPIx, u16 SPI_FLAG)
{
  FlagStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_SPI_GET_FLAG(SPI_FLAG));

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

/*******************************************************************************
* Function Name  : SPI_ClearFlag
* Description    : Clears the SPIx's pending flags.
* Input          : - SPIx: where x can be 1 or 2 to select the SPI peripheral.
*                  - SPI_FLAG: specifies the flag to clear. 
*                    This parameter can be any combination of the following values:
*                       - SPI_FLAG_OVR: Overrun flag.
*                       - SPI_FLAG_MODF: Mode Fault flag.
*                       - SPI_FLAG_CRCERR: CRC Error flag.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_ClearFlag(SPI_TypeDef* SPIx, u16 SPI_FLAG)
{
  /* Check the parameters */
  assert_param(IS_SPI_CLEAR_FLAG(SPI_FLAG));
    
  /* SPI_FLAG_MODF flag clear */
  if(SPI_FLAG == SPI_FLAG_MODF)
  {
    /* Read SR register */
    (void)SPIx->SR;
    /* Write on CR1 register */
    SPIx->CR1 |= CR1_SPE_Set; 
  }
  /* SPI_FLAG_OVR flag clear */
  else if(SPI_FLAG == SPI_FLAG_OVR)  
  {
    /* Read SR register */
    (void)SPIx->SR;
  }
  else /* SPI_FLAG_CRCERR flag clear */
  {
    /* Clear the selected SPI flag */
    SPIx->SR &= (u16)~SPI_FLAG;
  }
}

/*******************************************************************************
* Function Name  : SPI_GetITStatus
* Description    : Checks whether the specified SPI interrupt has occurred or not.
* Input          : - SPIx: where x can be 1 or 2 to select the SPI peripheral.
*                  - SPI_IT: specifies the SPI interrupt source to check. 
*                    This parameter can be one of the following values:
*                       - SPI_IT_OVR: Overrun interrupt.
*                       - SPI_IT_MODF: Mode Fault interrupt.
*                       - SPI_IT_CRCERR: CRC Error interrupt.
*                       - SPI_IT_TXE: Transmit buffer empty interrupt.
*                       - SPI_IT_RXNE: Receive buffer not empty interrupt.
* Output         : None
* Return         : The new state of SPI_IT (SET or RESET).
*******************************************************************************/
ITStatus SPI_GetITStatus(SPI_TypeDef* SPIx, u8 SPI_IT)
{
  ITStatus bitstatus = RESET;
  u16 itpos = 0, itmask = 0, enablestatus = 0;

  /* Check the parameters */
  assert_param(IS_SPI_GET_IT(SPI_IT));

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

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

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

/*******************************************************************************
* Function Name  : SPI_ClearITPendingBit
* Description    : Clears the SPIx抯 interrupt pending bits.
* Input          : - SPIx: where x can be 1 or 2 to select the SPI peripheral.
*                  - SPI_IT: specifies the SPI interrupt pending bit to clear.
*                    This parameter can be one of the following values:
*                       - SPI_IT_OVR: Overrun interrupt.
*                       - SPI_IT_MODF: Mode Fault interrupt.
*                       - SPI_IT_CRCERR: CRC Error interrupt.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_ClearITPendingBit(SPI_TypeDef* SPIx, u8 SPI_IT)
{
  u16 itpos = 0;

  /* Check the parameters */
  assert_param(IS_SPI_CLEAR_IT(SPI_IT));

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

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/