91x_ssp.c

STR912 arm9实现的以太网通信程序

{
  if(NewState == ENABLE)
  {
    /* Enable the selected SSP interrupts */
    SSPx->IMSCR |= SSP_IT;
  }
  else
  {
    /* Disable the selected SSP interrupts */
    SSPx->IMSCR &= ~SSP_IT;
  }
}

/*******************************************************************************
* Function Name  : SSP_DMACmd
* Description    : Configures the SSP0 DMA interface.
* Input          :  - SSPx: where x can be 0 or 1 to select the SSP peripheral.
*                   - SSP_DMATransfert : specifies the DMA transfert to be
*                    enabled or disabled. This parameter can be one of the
*                    following values:
*                         - SSP_DMA_Transmit: transmit Fifo DMA transfert
*                         - SSP_DMA_Receive : receive Fifo DMA transfert
*                  - NewState: new state of the DMA transfert.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void SSP_DMACmd(SSP_TypeDef* SSPx, u16 SSP_DMATransfert, FunctionalState NewState)
{
  if(NewState == ENABLE)
  {
    if(SSP_DMATransfert == SSP_DMA_Transmit)
    {
      /* Enable DMA for the transmit FIFO */
      SSPx->DMACR |= SSP_DMA_TransmitEnable;
    }
    else
    {
      /* Enable DMA for the receive FIFO */
      SSPx->DMACR |= SSP_DMA_ReceiveEnable;
    }
  }
  else
  {
    if(SSP_DMATransfert == SSP_DMA_Transmit)
    {
      /* Disable DMA for the transmit FIFO */
      SSPx->DMACR &= SSP_DMA_TransmitDisable;
    }
    else
    {
      /* Disable DMA for the receive FIFO */
      SSPx->DMACR &= SSP_DMA_ReceiveDisable;
    }
  }
}

/*******************************************************************************
* Function Name  : SSP_SendData.
* Description    : Transmits a Data through the SSP peripheral.
* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.
*                  - Data : Data to be transmitted.
* Output         : None
* Return         : None
*******************************************************************************/
void SSP_SendData(SSP_TypeDef* SSPx, u16 Data)
{
  /* Write in the DR register the data to be sent */
  SSPx->DR = Data;
}

/*******************************************************************************
* Function Name  : SSP_ReceiveData.
* Description    : Returns the most recent received data by the SSP peripheral.
* Input          : SSPx: where x can be 0 or 1 to select the SSP peripheral.
* Output         : None
* Return         : The value of the received data.
*******************************************************************************/
u16 SSP_ReceiveData(SSP_TypeDef* SSPx)
{
  /* Return the data in the DR register */	
  return SSPx->DR;
}

/*******************************************************************************
* Function Name  : SSP_LoopBackConfig
* Description    : Enable or disable the Loop back mode for the selected SSPx peripheral.
* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.
*                  - NewState: new state of the Loop Back mode.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None.
*******************************************************************************/
void SSP_LoopBackConfig(SSP_TypeDef* SSPx, FunctionalState NewState)
{
  if(NewState == ENABLE)
  {
    /* Enable loop back mode */
    SSPx->CR1 |= SSP_LoopBackMode_Enable;
  }
  else
  {
    /* Disable loop back mode */
    SSPx->CR1 &= SSP_LoopBackMode_Disable;
  }
}



/*******************************************************************************
* Function Name  : SSP_GetFlagStatus
* Description    : Checks whether the specified SSP flag is set or not.
* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.
*                  - SSP_FLAG: flag to check. This parameter can be one of the
*                    following values:
*                         - SSP_FLAG_Busy: busy flag
*                         - SSP_FLAG_RxFifoFull: Receive FIFO full flag
*                         - SSP_FLAG_RxFifoNotEmpty: Receive FIFO not empty flag
*                         - SSP_FLAG_TxFifoNotFull: Transmit FIFO not full flag
*                         - SSP_FLAG_TxFifoEmpty: Transmit FIFO empty flag
*                         - SSP_FLAG_TxFifo: Transmit FIFO half empty or less flag
*                         - SSP_FLAG_RxFifo: Receive FIFO half full or less flag
*                         - SSP_FLAG_RxTimeOut: Receive timeout flag
*                         - SSP_FLAG_RxOverrun: Receive overrun flag
* Output         : None
* Return         : The new state of SSP_Flag (SET or RESET).
*******************************************************************************/
FlagStatus SSP_GetFlagStatus(SSP_TypeDef* SSPx, u16 SSP_FLAG)
{
    u32 SSPReg = 0, FlagPos = 0;
    u32 StatusReg = 0;

  /* Get the SSP register index */
  SSPReg = SSP_FLAG >> 5;

  /* Get the flag position */
  FlagPos = SSP_FLAG & SSP_Flag_Mask;

  /* Find the register of the flag to check */
  if(SSPReg == 1)
  {
    /* The flag to check is in SR register */
    StatusReg = SSPx->SR;  	
  }
  else if (SSPReg == 2)
  {
    /* The flag to check is in RISR register */
    StatusReg = SSPx->RISR;
  }

  /* Check the status of the specified SSP flag */
  if((StatusReg & (1 << FlagPos)) != RESET)
  {
    /* Return SET if the SSP flag is set */
    return SET;
  }
  else
  {
    /* Return RESET if the SSP flag is reset */
    return RESET;
  }
}

/*******************************************************************************
* Function Name  : SSP_ClearFlag
* Description    : Clears the SSPx flags.
* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.
*                  - SSP_FLAG: flags to clear. This parameter one of the
*                    following values:
*                         - SSP_FLAG_RxTimeOut: Receive timeout flag
*                         - SSP_FLAG_RxOverrun: Receive overrun flag
* Output         : None
* Return         : None
*******************************************************************************/
void SSP_ClearFlag(SSP_TypeDef* SSPx, u16 SSP_FLAG)
{
    u8 FlagPos = 0;

  /* Get the flag position */
  FlagPos = SSP_FLAG & SSP_Flag_Mask;

  /* Clear the selected SSP flag */
  SSPx->ICR = (1 << FlagPos);
}

/*******************************************************************************
* Function Name  : SSP_GetITStatus
* Description    : Checks whether the specified SSP interrupt flag is set or not.
* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.
*                  - SSP_IT: interrupt flag to check. This parameter can be one
*                    of the following values:
*                         - SSP_IT_TxFifo: Transmit FIFO half empty or less interrupt
*                         - SSP_IT_RxFifo: Receive FIFO half full or less interrupt
*                         - SSP_IT_RxTimeOut: Receive timeout interrupt
*                         - SSP_IT_RxOverrun: Receive overrun interrupt
* Output         : None
* Return         : The new state of SSP_IT flag (SET or RESET).
*******************************************************************************/
ITStatus SSP_GetITStatus(SSP_TypeDef* SSPx, u16 SSP_IT)
{
  /* Check the status of the specified interrupt flag */
  if((SSPx->MISR & SSP_IT) != RESET)
  {
    /* Return SET if the SSP interrupt flag is set */
    return SET;
  }
  else
  {
    /* Return RESET if SSP interrupt flag is reset */
    return RESET;
  }
}

/*******************************************************************************
* Function Name  : SSP_ClearITPendingBit
* Description    : Clears the pending interrupt flags.
* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.
*                  - SSP_IT: interrupts pending bits to clear. This parameter
*                    can be any combination of the following values:
*                         - SSP_IT_RxTimeOut: Receive timeout interrupt
*                         - SSP_IT_RxOverrun: Receive overrun interrupt
* Output         : None
* Return         : None
*******************************************************************************/
void SSP_ClearITPendingBit(SSP_TypeDef* SSPx, u16 SSP_IT)
{
  /* Clear the selected SSP interrupts pending bits */
  SSPx->ICR = SSP_IT;
}

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