stm32f10x_dma.c

STM32下做的usb转RS232程序

*                       - DMA_IT_TE:  Transfer error interrupt mask
*                  - NewState: new state of the specified DMA interrupts.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_ITConfig(DMA_Channel_TypeDef* DMA_Channelx, u32 DMA_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_DMA_CONFIG_IT(DMA_IT));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected DMA interrupts */
    DMA_Channelx->CCR |= DMA_IT;
  }
  else
  {
    /* Disable the selected DMA interrupts */
    DMA_Channelx->CCR &= ~DMA_IT;
  }
}

/*******************************************************************************
* Function Name  : DMA_GetCurrDataCounter
* Description    : Returns the number of remaining data units in the current
*                  DMA Channelx transfer.
* Input          : - DMA_Channelx: where x can be 1, 2 to 7 to select the DMA
*                    Channel.
* Output         : None
* Return         : The number of remaining data units in the current DMA Channel
*                  transfer..
*******************************************************************************/
u16 DMA_GetCurrDataCounter(DMA_Channel_TypeDef* DMA_Channelx)
{
  /* Return the current memory address value for Channelx */
  return ((u16)(DMA_Channelx->CNDTR));
}

/*******************************************************************************
* Function Name  : DMA_GetFlagStatus
* Description    : Checks whether the specified DMA Channelx flag is set or not.
* Input          : - DMA_FLAG: specifies the flag to check. 
*                    This parameter can be one of the following values:
*                       - DMA_FLAG_GL1: Channel1 global flag.
*                       - DMA_FLAG_TC1: Channel1 transfer complete flag.
*                       - DMA_FLAG_HT1: Channel1 half transfer flag.
*                       - DMA_FLAG_TE1: Channel1 transfer error flag.
*                       - DMA_FLAG_GL2: Channel2 global flag.
*                       - DMA_FLAG_TC2: Channel2 transfer complete flag.
*                       - DMA_FLAG_HT2: Channel2 half transfer flag.
*                       - DMA_FLAG_TE2: Channel2 transfer error flag.
*                       - DMA_FLAG_GL3: Channel3 global flag.
*                       - DMA_FLAG_TC3: Channel3 transfer complete flag.
*                       - DMA_FLAG_HT3: Channel3 half transfer flag.
*                       - DMA_FLAG_TE3: Channel3 transfer error flag.
*                       - DMA_FLAG_GL4: Channel4 global flag.
*                       - DMA_FLAG_TC4: Channel4 transfer complete flag.
*                       - DMA_FLAG_HT4: Channel4 half transfer flag.
*                       - DMA_FLAG_TE4: Channel4 transfer error flag.
*                       - DMA_FLAG_GL5: Channel5 global flag.
*                       - DMA_FLAG_TC5: Channel5 transfer complete flag.
*                       - DMA_FLAG_HT5: Channel5 half transfer flag.
*                       - DMA_FLAG_TE5: Channel5 transfer error flag.
*                       - DMA_FLAG_GL6: Channel6 global flag.
*                       - DMA_FLAG_TC6: Channel6 transfer complete flag.
*                       - DMA_FLAG_HT6: Channel6 half transfer flag.
*                       - DMA_FLAG_TE6: Channel6 transfer error flag.
*                       - DMA_FLAG_GL7: Channel7 global flag.
*                       - DMA_FLAG_TC7: Channel7 transfer complete flag.
*                       - DMA_FLAG_HT7: Channel7 half transfer flag.
*                       - DMA_FLAG_TE7: Channel7 transfer error flag.
* Output         : None
* Return         : The new state of DMA_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus DMA_GetFlagStatus(u32 DMA_FLAG)
{
  FlagStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_DMA_GET_FLAG(DMA_FLAG));

  /* Check the status of the specified DMA flag */
  if ((DMA->ISR & DMA_FLAG) != (u32)RESET)
  {
    /* DMA_FLAG is set */
    bitstatus = SET;
  }
  else
  {
    /* DMA_FLAG is reset */
    bitstatus = RESET;
  }
  /* Return the DMA_FLAG status */
  return  bitstatus;
}

/*******************************************************************************
* Function Name  : DMA_ClearFlag
* Description    : Clears the DMA Channelx's pending flags.
* Input          : - DMA_FLAG: specifies the flag to clear. 
*                    This parameter can be any combination of the following values:
*                       - DMA_FLAG_GL1: Channel1 global flag.
*                       - DMA_FLAG_TC1: Channel1 transfer complete flag.
*                       - DMA_FLAG_HT1: Channel1 half transfer flag.
*                       - DMA_FLAG_TE1: Channel1 transfer error flag.
*                       - DMA_FLAG_GL2: Channel2 global flag.
*                       - DMA_FLAG_TC2: Channel2 transfer complete flag.
*                       - DMA_FLAG_HT2: Channel2 half transfer flag.
*                       - DMA_FLAG_TE2: Channel2 transfer error flag.
*                       - DMA_FLAG_GL3: Channel3 global flag.
*                       - DMA_FLAG_TC3: Channel3 transfer complete flag.
*                       - DMA_FLAG_HT3: Channel3 half transfer flag.
*                       - DMA_FLAG_TE3: Channel3 transfer error flag.
*                       - DMA_FLAG_GL4: Channel4 global flag.
*                       - DMA_FLAG_TC4: Channel4 transfer complete flag.
*                       - DMA_FLAG_HT4: Channel4 half transfer flag.
*                       - DMA_FLAG_TE4: Channel4 transfer error flag.
*                       - DMA_FLAG_GL5: Channel5 global flag.
*                       - DMA_FLAG_TC5: Channel5 transfer complete flag.
*                       - DMA_FLAG_HT5: Channel5 half transfer flag.
*                       - DMA_FLAG_TE5: Channel5 transfer error flag.
*                       - DMA_FLAG_GL6: Channel6 global flag.
*                       - DMA_FLAG_TC6: Channel6 transfer complete flag.
*                       - DMA_FLAG_HT6: Channel6 half transfer flag.
*                       - DMA_FLAG_TE6: Channel6 transfer error flag.
*                       - DMA_FLAG_GL7: Channel7 global flag.
*                       - DMA_FLAG_TC7: Channel7 transfer complete flag.
*                       - DMA_FLAG_HT7: Channel7 half transfer flag.
*                       - DMA_FLAG_TE7: Channel7 transfer error flag.
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_ClearFlag(u32 DMA_FLAG)
{
  /* Check the parameters */
  assert_param(IS_DMA_CLEAR_FLAG(DMA_FLAG));

  /* Clear the selected DMA flags */
  DMA->IFCR = DMA_FLAG;
}

/*******************************************************************************
* Function Name  : DMA_GetITStatus
* Description    : Checks whether the specified DMA Channelx interrupt has 
*                  occurred or not.
* Input          : - DMA_IT: specifies the DMA interrupt source to check. 
*                    This parameter can be one of the following values:
*                       - DMA_IT_GL1: Channel1 global interrupt.
*                       - DMA_IT_TC1: Channel1 transfer complete interrupt.
*                       - DMA_IT_HT1: Channel1 half transfer interrupt.
*                       - DMA_IT_TE1: Channel1 transfer error interrupt.
*                       - DMA_IT_GL2: Channel2 global interrupt.
*                       - DMA_IT_TC2: Channel2 transfer complete interrupt.
*                       - DMA_IT_HT2: Channel2 half transfer interrupt.
*                       - DMA_IT_TE2: Channel2 transfer error interrupt.
*                       - DMA_IT_GL3: Channel3 global interrupt.
*                       - DMA_IT_TC3: Channel3 transfer complete interrupt.
*                       - DMA_IT_HT3: Channel3 half transfer interrupt.
*                       - DMA_IT_TE3: Channel3 transfer error interrupt.
*                       - DMA_IT_GL4: Channel4 global interrupt.
*                       - DMA_IT_TC4: Channel4 transfer complete interrupt.
*                       - DMA_IT_HT4: Channel4 half transfer interrupt.
*                       - DMA_IT_TE4: Channel4 transfer error interrupt.
*                       - DMA_IT_GL5: Channel5 global interrupt.
*                       - DMA_IT_TC5: Channel5 transfer complete interrupt.
*                       - DMA_IT_HT5: Channel5 half transfer interrupt.
*                       - DMA_IT_TE5: Channel5 transfer error interrupt.
*                       - DMA_IT_GL6: Channel6 global interrupt.
*                       - DMA_IT_TC6: Channel6 transfer complete interrupt.
*                       - DMA_IT_HT6: Channel6 half transfer interrupt.
*                       - DMA_IT_TE6: Channel6 transfer error interrupt.
*                       - DMA_IT_GL7: Channel7 global interrupt.
*                       - DMA_IT_TC7: Channel7 transfer complete interrupt.
*                       - DMA_IT_HT7: Channel7 half transfer interrupt.
*                       - DMA_IT_TE7: Channel7 transfer error interrupt.
* Output         : None
* Return         : The new state of DMA_IT (SET or RESET).
*******************************************************************************/
ITStatus DMA_GetITStatus(u32 DMA_IT)
{
  ITStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_DMA_GET_IT(DMA_IT));

  /* Check the status of the specified DMA interrupt */
  if ((DMA->ISR & DMA_IT) != (u32)RESET)
  {
    /* DMA_IT is set */
    bitstatus = SET;
  }
  else
  {
    /* DMA_IT is reset */
    bitstatus = RESET;
  }
  /* Return the DMA_IT status */
  return  bitstatus;
}

/*******************************************************************************
* Function Name  : DMA_ClearITPendingBit
* Description    : Clears the DMA Channelx抯 interrupt pending bits.
* Input          : - DMA_IT: specifies the DMA interrupt pending bit to clear.
*                    This parameter can be any combination of the following values:
*                       - DMA_IT_GL1: Channel1 global interrupt.
*                       - DMA_IT_TC1: Channel1 transfer complete interrupt.
*                       - DMA_IT_HT1: Channel1 half transfer interrupt.
*                       - DMA_IT_TE1: Channel1 transfer error interrupt.
*                       - DMA_IT_GL2: Channel2 global interrupt.
*                       - DMA_IT_TC2: Channel2 transfer complete interrupt.
*                       - DMA_IT_HT2: Channel2 half transfer interrupt.
*                       - DMA_IT_TE2: Channel2 transfer error interrupt.
*                       - DMA_IT_GL3: Channel3 global interrupt.
*                       - DMA_IT_TC3: Channel3 transfer complete interrupt.
*                       - DMA_IT_HT3: Channel3 half transfer interrupt.
*                       - DMA_IT_TE3: Channel3 transfer error interrupt.
*                       - DMA_IT_GL4: Channel4 global interrupt.
*                       - DMA_IT_TC4: Channel4 transfer complete interrupt.
*                       - DMA_IT_HT4: Channel4 half transfer interrupt.
*                       - DMA_IT_TE4: Channel4 transfer error interrupt.
*                       - DMA_IT_GL5: Channel5 global interrupt.
*                       - DMA_IT_TC5: Channel5 transfer complete interrupt.
*                       - DMA_IT_HT5: Channel5 half transfer interrupt.
*                       - DMA_IT_TE5: Channel5 transfer error interrupt.
*                       - DMA_IT_GL6: Channel6 global interrupt.
*                       - DMA_IT_TC6: Channel6 transfer complete interrupt.
*                       - DMA_IT_HT6: Channel6 half transfer interrupt.
*                       - DMA_IT_TE6: Channel6 transfer error interrupt.
*                       - DMA_IT_GL7: Channel7 global interrupt.
*                       - DMA_IT_TC7: Channel7 transfer complete interrupt.
*                       - DMA_IT_HT7: Channel7 half transfer interrupt.
*                       - DMA_IT_TE7: Channel7 transfer error interrupt.
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_ClearITPendingBit(u32 DMA_IT)
{
  /* Check the parameters */
  assert_param(IS_DMA_CLEAR_IT(DMA_IT));

  /* Clear the selected DMA interrupt pending bits */
  DMA->IFCR = DMA_IT;
}

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