LDMA_Descriptor_t Union Reference

DMA descriptor.

The LDMA DMA controller supports three different DMA descriptors. Each consists of four WORDs which map directly onto HW control registers for a given DMA channel. The three descriptor types are XFER, SYNC and WRI. Refer to the reference manual for further information.

Definition at line 787 of file em_ldma.h .

#include < em_ldma.h >

Data Fields

struct {
uint32_t blockSize : 4
uint32_t byteSwap : 1
uint32_t decLoopCnt : 1
uint32_t doneIfs : 1
uint32_t dstAddrMode : 1
uint32_t dstInc : 2
uint32_t ignoreSrec : 1
uint32_t link : 1
int32_t linkAddr : 30
uint32_t linkMode : 1
uint32_t matchEn : 8
uint32_t matchVal : 8
uint32_t reqMode : 1
uint32_t reserved0 : 1
uint32_t reserved3 : 16
uint32_t reserved4 : 16
uint32_t size : 2
uint32_t srcAddrMode : 1
uint32_t srcInc : 2
uint32_t structReq : 1
uint32_t structType : 2
uint32_t syncClr : 8
uint32_t syncSet : 8
uint32_t xferCnt : 11
} sync
struct {
uint32_t blockSize : 4
uint32_t byteSwap : 1
uint32_t decLoopCnt : 1
uint32_t doneIfs : 1
uint32_t dstAddr
uint32_t dstAddrMode : 1
uint32_t dstInc : 2
uint32_t ignoreSrec : 1
uint32_t immVal
uint32_t link : 1
int32_t linkAddr : 30
uint32_t linkMode : 1
uint32_t reqMode : 1
uint32_t reserved0 : 1
uint32_t size : 2
uint32_t srcAddrMode : 1
uint32_t srcInc : 2
uint32_t structReq : 1
uint32_t structType : 2
uint32_t xferCnt : 11
} wri
struct {
uint32_t blockSize : 4
uint32_t byteSwap : 1
uint32_t decLoopCnt : 1
uint32_t doneIfs : 1
uint32_t dstAddr
uint32_t dstAddrMode : 1
uint32_t dstInc : 2
uint32_t ignoreSrec : 1
uint32_t link : 1
int32_t linkAddr : 30
uint32_t linkMode : 1
uint32_t reqMode : 1
uint32_t reserved0 : 1
uint32_t size : 2
uint32_t srcAddr
uint32_t srcAddrMode : 1
uint32_t srcInc : 2
uint32_t structReq : 1
uint32_t structType : 2
uint32_t xferCnt : 11
} xfer

Field Documentation

uint32_t LDMA_Descriptor_t::blockSize

Number of unit transfers per arbitration cycle.

Definition at line 798 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::byteSwap

Enable byte swapping transfers.

Definition at line 797 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::decLoopCnt

Enable looped transfers.

Definition at line 801 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::doneIfs

Generate interrupt when done.

Definition at line 799 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::dstAddr

DMA destination address.

DMA write destination address.

Definition at line 810 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::dstAddrMode

Destination addressing mode.

Definition at line 807 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::dstInc

Destination address increment unit size.

Definition at line 805 of file em_ldma.h .

Referenced by MIC_init() .

uint32_t LDMA_Descriptor_t::ignoreSrec

Ignore single requests.

Definition at line 802 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::immVal

Data to be written at dstAddr.

Definition at line 867 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::link

Enable LINKLOAD when transfer is done.

Definition at line 813 of file em_ldma.h .

int32_t LDMA_Descriptor_t::linkAddr

Address of next (linked) descriptor.

Definition at line 814 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::linkMode

Select absolute or relative link address.

Definition at line 812 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::matchEn

Sync trigger match enable.

Definition at line 841 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::matchVal

Sync trigger match value.

Definition at line 840 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::reqMode

Block or cycle transfer selector.

Definition at line 800 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::size

DMA transfer unit size.

Definition at line 804 of file em_ldma.h .

Referenced by MIC_init() .

uint32_t LDMA_Descriptor_t::srcAddr

DMA source address.

Definition at line 809 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::srcAddrMode

Source addressing mode.

Definition at line 806 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::srcInc

Source address increment unit size.

Definition at line 803 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::structReq

DMA transfer trigger during LINKLOAD.

Definition at line 795 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::structType

Set to 0 to select XFER descriptor type.

Set to 1 to select SYNC descriptor type.

Set to 2 to select WRITE descriptor type.

Definition at line 793 of file em_ldma.h .

struct { ... } LDMA_Descriptor_t::sync

SYNCHRONIZE DMA descriptor, used for intra channel transfer synchronization.

uint32_t LDMA_Descriptor_t::syncClr

Clear bits in LDMA_CTRL.SYNCTRIG register.

Definition at line 838 of file em_ldma.h .

uint32_t LDMA_Descriptor_t::syncSet

Set bits in LDMA_CTRL.SYNCTRIG register.

Definition at line 837 of file em_ldma.h .

struct { ... } LDMA_Descriptor_t::wri

WRITE DMA descriptor, used for write immediate operations.

struct { ... } LDMA_Descriptor_t::xfer

TRANSFER DMA descriptor, this is the only descriptor type which can be used to start a DMA transfer.

Referenced by MIC_init() .

uint32_t LDMA_Descriptor_t::xferCnt

Transfer count minus one.

Definition at line 796 of file em_ldma.h .


The documentation for this union was generated from the following file:
  • C:/HandsOn/super/platform/emlib/inc/ em_ldma.h