73x_dma.c

国外LPC2000系列的一些源程序,请大家快快下载

*                         - DMA_IT_SE0: Stream0 transfer error interrupt mask
*                         - DMA_IT_SE1: Stream1 transfer error interrupt mask
*                         - DMA_IT_SE2: Stream2 transfer error interrupt mask
*                         - DMA_IT_SE3: Stream3 transfer error interrupt mask
*                         - DMA_IT_ALL: ALL DMA interrupts mask
*                  - NewState: new state of the specified DMA interrupts.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_ITConfig(DMA_TypeDef* DMAx, u16 DMA_IT, FunctionalState NewState)
{
  if(NewState == ENABLE)
  {
    DMAx->MASK |= DMA_IT;
  }
  else
  {
    DMAx->MASK &= ~DMA_IT;
  }
}

/*******************************************************************************
* Function Name  : DMA_GetCurrDSTAddr
* Description    : Returns the current value of the destination address pointer
*                  related to the specified DMA stream.
* Input          : - DMAx: where x can be 0, 1, 2 or 3 to select the DMA controller.
*                  - DMA_Stream: specifies the DMA stream to get its destination
*                    address pointer current value.
*                    This parameter can be one of the following values:
*                         - DMA_Stream0
*                         - DMA_Stream1
*                         - DMA_Stream2
*                         - DMA_Stream3
* Output         : None
* Return         : The current value of the destination address pointer related
*                  to the specified DMA stream.
*******************************************************************************/
u32 DMA_GetCurrDSTAddr(DMA_TypeDef* DMAx, u8 DMA_Stream)
{
  u32 Stream_BaseAddr = 0;

 /* get the base address of the stream to be used:
    Stream_BaseAddr := DMAx_Base + Stream offset */
  Stream_BaseAddr = (*(u32*)&(DMAx)) + DMA_Stream ;

  return(*(u32*)(Stream_BaseAddr+DMA_DECURRL)|(*(u32*)(Stream_BaseAddr+DMA_DECURRH)<<16));
}

/*******************************************************************************
* Function Name  : DMA_GetCurrSRCAddr
* Description    : Returns the current value of the source address pointer
*                  related to the specified DMA stream.
* Input          : - DMAx: where x can be 0, 1, 2 or 3 to select the DMA controller.
*                  - DMA_Stream: specifies the DMA stream to get its source
*                    address pointer current value.
*                    This parameter can be one of the following values:
*                         - DMA_Stream0
*                         - DMA_Stream1
*                         - DMA_Stream2
*                         - DMA_Stream3
* Output         : None
* Return         : The current value of the source address pointer related to
*                  the specified DMA stream.
*******************************************************************************/
u32 DMA_GetCurrSRCAddr(DMA_TypeDef* DMAx, u8 DMA_Stream)
{
  u32 Stream_BaseAddr = 0;

 /* get the base address of the stream to be used:
    Stream_BaseAddr := DMAx_Base + Stream offset */
  Stream_BaseAddr = (*(u32*)&(DMAx)) + DMA_Stream ;

  return(*(u32*)(Stream_BaseAddr+DMA_SOCURRL)|(*(u32*)(Stream_BaseAddr+DMA_SOCURRH)<<16));
}

/*******************************************************************************
* Function Name  : DMA_GetTerminalCounter
* Description    : Returns the number of data units remaining in the current
*                  DMAx stream transfer.
* Input          : - DMAx: where x can be 0, 1, 2 or 3 to select the DMA controller.
*                  - DMA_Stream: specifies the DMA stream to get its number of
*                    data units remaining in the current DMA transfer.
*                    This parameter can be one of the following values:
*                         - DMA_Stream0
*                         - DMA_Stream1
*                         - DMA_Stream2
*                         - DMA_Stream3
* Output         : None
* Return         : The number of data units remaining in the current DMAx stream
*                  transfer.
*******************************************************************************/
u16 DMA_GetTerminalCounter(DMA_TypeDef* DMAx, u8 DMA_Stream)
{
  u32 Stream_BaseAddr = 0;

 /* get the base address of the stream to be used:
    Stream_BaseAddr := DMAx_Base + Stream offset */
  Stream_BaseAddr = (*(u32*)&(DMAx)) + DMA_Stream ;

  return(*(u32*)(Stream_BaseAddr+DMA_TCNT));
}

/*******************************************************************************
* Function Name  : DMA_LastBufferSweepConfig
* Description    : Activates the last buffer sweep mode for the DMAx stream
*                  configured in circular buffer mode.
* Input          : - DMAx: where x can be 0, 1, 2 or 3 to select the DMA controller.
*                  - DMA_Stream: specifies the DMA stream to start its last
*                    circular buffer sweep.
*                    This parameter can be one of the following values:
*                         - DMA_Stream0
*                         - DMA_Stream1
*                         - DMA_Stream2
*                         - DMA_Stream3
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_LastBufferSweepConfig(DMA_TypeDef* DMAx, u8 DMA_Stream)
{
  switch(DMA_Stream)
  {
    case DMA_Stream0 :
    DMAx->Last |= DMA_LAST0;
    break;

    case DMA_Stream1 :
    DMAx->Last |= DMA_LAST1;
    break;

    case DMA_Stream2:
    DMAx->Last |= DMA_LAST2;
    break;

    case DMA_Stream3:
    DMAx->Last |= DMA_LAST3;
    break;
  }
}

/*******************************************************************************
* Function Name  : DMA_LastBufferAddrConfig
* Description    : Configures the circular buffer position where the last data 
*                  to be used by the specified DMA stream is located.
* Input          : - DMAx: where x can be 0, 1, 2 or 3 to select the DMA controller.
*                  - DMA_Stream: specifies the DMA stream to configure.
*                    This parameter can be one of the following values:
*                         - DMA_Stream0
*                         - DMA_Stream1
*                         - DMA_Stream2
*                         - DMA_Stream3
*                  - DMA_LastBufferAddr: specifies the circular buffer position
*                    where the last data to be used by the specified DMA stream
*                    is located.
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_LastBufferAddrConfig(DMA_TypeDef* DMAx, u8 DMA_Stream, u16 DMA_LastBufferAddr)
{
  u32 Stream_BaseAddr = 0;

 /* get the base address of the stream to be used:
    Stream_BaseAddr := DMAx_Base + Stream offset */
  Stream_BaseAddr = (*(u32*)&(DMAx)) + DMA_Stream ;

  *(u16 *)(Stream_BaseAddr + DMA_LUBUFF) = DMA_LastBufferAddr;
}

/*******************************************************************************
* Function Name  : DMA_TimeOutConfig
* Description    : Sets DMA transaction time out.
* Input          : TimeOut_Value: specifies the DMA Time Out value.
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_TimeOutConfig(u16 TimeOut_Value)
{
  /* set the DMA Time Out value */
  ARB->TOR = TimeOut_Value;
}

/*******************************************************************************
* Function Name  : DMA_FlagStatus
* Description    : Checks whether the specified DMA controller flag is set or not.
* Input          : - DMAx : where x can be 0, 1, 2 or 3 to select the DMA controller.
*                  - DMA_Flag: flag to check. This parameter can be one of the
*                    following values:
*                         - DMA_FLAG_INT0: Stream0 transfer end interrupt flag
*                         - DMA_FLAG_INT1: Stream1 transfer end interrupt flag
*                         - DMA_FLAG_INT2: Stream2 transfer end interrupt flag
*                         - DMA_FLAG_INT3: Stream3 transfer end interrupt flag
*                         - DMA_FLAG_ERR0: Stream0 transfer error interrupt flag
*                         - DMA_FLAG_ERR1: Stream1 transfer error interrupt flag
*                         - DMA_FLAG_ERR2: Stream2 transfer error interrupt flag
*                         - DMA_FLAG_ERR3: Stream3 transfer error interrupt flag
*                         - DMA_FLAG_ACT0: Stream0 status
*                         - DMA_FLAG_ACT1: Stream1 status
*                         - DMA_FLAG_ACT2: Stream2 status
*                         - DMA_FLAG_ACT3: Stream3 status

* Output         : None
* Return         : The new state of DMA_Flag (SET or RESET).
*******************************************************************************/
FlagStatus DMA_FlagStatus(DMA_TypeDef* DMAx, u16 DMA_Flag)
{
  if((DMAx->STATUS & DMA_Flag) != RESET)
  {
    return SET;
  }
  else
  {
    return RESET;
  }
}

/*******************************************************************************
* Function Name  : DMA_FlagClear
* Description    : Clears the pending interrupt flags corresponding to the
*                  specified DMA stream.
* Input          : - DMAx : where x can be 0, 1, 2 or 3 to select the DMA controller.
*                  - DMA_Flag: flags to clear. This parameter can be any
*                    combination of the following values:
*                         - DMA_FLAG_INT0: Clears the pending flag of Stream0
*                                          transfer end interrupt.
*                         - DMA_FLAG_INT1: Clears the pending flag of Stream1
*                                          transfer end interrupt.
*                         - DMA_FLAG_INT2: Clears the pending flag of Stream2
*                                          transfer end interrupt.
*                         - DMA_FLAG_INT3: Clears the pending flag of Stream3
*                                          transfer end interrupt.
*                         - DMA_FLAG_ERR0: Clears the pending flag of Stream0
*                                          transfer error interrupt.
*                         - DMA_FLAG_ERR1: Clears the pending flag of Stream1
*                                          transfer error interrupt.
*                         - DMA_FLAG_ERR2: Clears the pending flag of Stream2
*                                          transfer error interrupt.
*                         - DMA_FLAG_ERR3: Clears the pending flag of Stream3
*                                          transfer error interrupt.
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_FlagClear(DMA_TypeDef* DMAx, u16 DMA_Flag)
{
  /* Set the bit corresponding to the flags to clear */
  DMAx->CLR  =  DMA_Flag ;
}

/******************* (C) COPYRIGHT 2005 STMicroelectronics *****END OF FILE****/