DMA_CB_TypeDef Struct ReferenceEMLIB > DMA

Callback structure that can be used to define DMA complete actions.

A reference to this structure is only stored in the primary descriptor for a channel (if using callback feature). If callback is required for both primary and alternate descriptor completion, this must be handled by one common callback, using the provided 'primary' parameter with the callback function.

Definition at line 138 of file em_dma.h .

#include < em_dma.h >

Data Fields

DMA_FuncPtr_TypeDef cbFunc
uint8_t primary
void * userPtr

Field Documentation

DMA_FuncPtr_TypeDef DMA_CB_TypeDef::cbFunc

Pointer to callback function to invoke when DMA transfer cycle is done. Notice that this function is invoked in interrupt context, and therefore should be short and non-blocking.

Definition at line 144 of file em_dma.h .

Referenced by DMA_IRQHandler() .

uint8_t DMA_CB_TypeDef::primary

For internal use only: Indicates if next callback applies to primary or alternate descriptor completion. Mainly useful for ping-pong DMA cycles. Set this value to 0 prior to configuring callback handling.

Definition at line 154 of file em_dma.h .

Referenced by DMA_ActivateScatterGather() , and DMA_IRQHandler() .

void* DMA_CB_TypeDef::userPtr

User defined pointer to provide with callback function.

Definition at line 147 of file em_dma.h .

Referenced by DMA_IRQHandler() .

The documentation for this struct was generated from the following file:
  • C:/cygwin/home/caamunds/work/super/platform/emlib/inc/ em_dma.h