DMA_CfgDescrSGAlt_TypeDef Struct Reference

Configuration structure for alternate scatter-gather descriptor.

#include <em_dma.h>

Data Fields

void * src
 Pointer to location to transfer data from.
 
void * dst
 Pointer to location to transfer data to.
 
DMA_DataInc_TypeDef dstInc
 Destination increment size for each DMA transfer.
 
DMA_DataInc_TypeDef srcInc
 Source increment size for each DMA transfer.
 
DMA_DataSize_TypeDef size
 DMA transfer unit size.
 
DMA_ArbiterConfig_TypeDef arbRate
 Arbitration rate, i.e., number of DMA transfers done before re-arbitration takes place.
 
uint16_t nMinus1
 Number of DMA transfers minus 1 to do.
 
uint8_t hprot
 HPROT signal state, refer to reference manual, DMA chapter for further details.
 
bool peripheral
 Specify if a memory or peripheral scatter-gather DMA cycle.
 

Configuration structure for alternate scatter-gather descriptor.

Field Documentation

◆ src

void* DMA_CfgDescrSGAlt_TypeDef::src

Pointer to location to transfer data from.

◆ dst

void* DMA_CfgDescrSGAlt_TypeDef::dst

Pointer to location to transfer data to.

◆ dstInc

DMA_DataInc_TypeDef DMA_CfgDescrSGAlt_TypeDef::dstInc

Destination increment size for each DMA transfer.

◆ srcInc

DMA_DataInc_TypeDef DMA_CfgDescrSGAlt_TypeDef::srcInc

Source increment size for each DMA transfer.

◆ size

DMA_DataSize_TypeDef DMA_CfgDescrSGAlt_TypeDef::size

DMA transfer unit size.

◆ arbRate

DMA_ArbiterConfig_TypeDef DMA_CfgDescrSGAlt_TypeDef::arbRate

Arbitration rate, i.e., number of DMA transfers done before re-arbitration takes place.

◆ nMinus1

uint16_t DMA_CfgDescrSGAlt_TypeDef::nMinus1

Number of DMA transfers minus 1 to do.

Must be <= 1023.

◆ hprot

uint8_t DMA_CfgDescrSGAlt_TypeDef::hprot

HPROT signal state, refer to reference manual, DMA chapter for further details.

Normally set to 0 if protection is not an issue. The following bits are available:

  • bit 0 - HPROT[1] control for source read accesses, privileged/non-privileged access.
  • bit 3 - HPROT[1] control for destination write accesses, privileged/non-privileged access.

◆ peripheral

bool DMA_CfgDescrSGAlt_TypeDef::peripheral

Specify if a memory or peripheral scatter-gather DMA cycle.

Notice that this parameter should be the same for all alternate descriptors.

  • true - this is a peripheral scatter-gather cycle.
  • false - this is a memory scatter-gather cycle.