DMA Private Functions

Functions
static void	DMA_SetConfig (DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)
	Sets the DMA Transfer parameter. More...
static void	DMA_CalcDMAMUXChannelBaseAndMask (DMA_HandleTypeDef *hdma)
	Updates the DMA handle with the DMAMUX channel and status mask depending on channel number. More...
static void	DMA_CalcDMAMUXRequestGenBaseAndMask (DMA_HandleTypeDef *hdma)
	Updates the DMA handle with the DMAMUX request generator params. More...

Detailed Description

Function Documentation

DMA_CalcDMAMUXChannelBaseAndMask()

static void DMA_CalcDMAMUXChannelBaseAndMask ( DMA_HandleTypeDef *  hdma )

static

Updates the DMA handle with the DMAMUX channel and status mask depending on channel number.

Parameters

hdma	pointer to a DMA_HandleTypeDef structure that contains the configuration information for the specified DMA Channel.

Return values

None

Definition at line 1115 of file stm32l4xx_hal_dma.c.

{
  uint32_t channel_number;

  /* check if instance is not outside the DMA channel range */
  if ((uint32_t)hdma->Instance < (uint32_t)DMA2_Channel1)
  {
    /* DMA1 */
    hdma->DMAmuxChannel = (DMAMUX1_Channel0 + (hdma->ChannelIndex >> 2U));
  }
  else
  {
    /* DMA2 */
    hdma->DMAmuxChannel = (DMAMUX1_Channel7 + (hdma->ChannelIndex >> 2U));
  }

  channel_number = (((uint32_t)hdma->Instance & 0xFFU) - 8U) / 20U;
  hdma->DMAmuxChannelStatus = DMAMUX1_ChannelStatus;
  hdma->DMAmuxChannelStatusMask = 1UL << (channel_number & 0x1CU);
}

DMA_CalcDMAMUXRequestGenBaseAndMask()

static void DMA_CalcDMAMUXRequestGenBaseAndMask ( DMA_HandleTypeDef *  hdma )

static

Updates the DMA handle with the DMAMUX request generator params.

Parameters

hdma	pointer to a DMA_HandleTypeDef structure that contains the configuration information for the specified DMA Channel.

Return values

None

Definition at line 1143 of file stm32l4xx_hal_dma.c.

{
  uint32_t request =  hdma->Init.Request & DMAMUX_CxCR_DMAREQ_ID;

  /* DMA Channels are connected to DMAMUX1 request generator blocks*/
  hdma->DMAmuxRequestGen = (DMAMUX_RequestGen_TypeDef *)((uint32_t)(((uint32_t)DMAMUX1_RequestGenerator0) + ((request - 1U) * 4U)));

  hdma->DMAmuxRequestGenStatus = DMAMUX1_RequestGenStatus;

  /* here "Request" is either DMA_REQUEST_GENERATOR0 to DMA_REQUEST_GENERATOR3, i.e. <= 4*/
  hdma->DMAmuxRequestGenStatusMask = 1UL << ((request - 1U) & 0x3U);
}

DMA_SetConfig()

static void DMA_SetConfig ( DMA_HandleTypeDef *  hdma, uint32_t  SrcAddress, uint32_t  DstAddress, uint32_t  DataLength  )

static

Sets the DMA Transfer parameter.

Parameters

hdma	pointer to a DMA_HandleTypeDef structure that contains the configuration information for the specified DMA Channel.
SrcAddress	The source memory Buffer address
DstAddress	The destination memory Buffer address
DataLength	The length of data to be transferred from source to destination

Return values

HAL

status

Definition at line 1068 of file stm32l4xx_hal_dma.c.

{
#if defined(DMAMUX1)
  /* Clear the DMAMUX synchro overrun flag */
  hdma->DMAmuxChannelStatus->CFR = hdma->DMAmuxChannelStatusMask;

  if(hdma->DMAmuxRequestGen != 0U)
  {
    /* Clear the DMAMUX request generator overrun flag */
    hdma->DMAmuxRequestGenStatus->RGCFR = hdma->DMAmuxRequestGenStatusMask;
  }
#endif

  /* Clear all flags */
  hdma->DmaBaseAddress->IFCR = (DMA_ISR_GIF1 << (hdma->ChannelIndex & 0x1CU));

  /* Configure DMA Channel data length */
  hdma->Instance->CNDTR = DataLength;

  /* Memory to Peripheral */
  if((hdma->Init.Direction) == DMA_MEMORY_TO_PERIPH)
  {
    /* Configure DMA Channel destination address */
    hdma->Instance->CPAR = DstAddress;

    /* Configure DMA Channel source address */
    hdma->Instance->CMAR = SrcAddress;
  }
  /* Peripheral to Memory */
  else
  {
    /* Configure DMA Channel source address */
    hdma->Instance->CPAR = SrcAddress;

    /* Configure DMA Channel destination address */
    hdma->Instance->CMAR = DstAddress;
  }
}