LDMA_Descriptor_t Union ReferenceEMLIB > LDMA
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
761
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
772
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::byteSwap |
Enable byte swapping transfers.
Definition at line
771
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::decLoopCnt |
Enable looped transfers.
Definition at line
775
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::doneIfs |
Generate interrupt when done.
Definition at line
773
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::dstAddr |
DMA destination address.
DMA write destination address.
Definition at line
784
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::dstAddrMode |
Destination addressing mode.
Definition at line
781
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::dstInc |
Destination address increment unit size.
Definition at line
779
of file
em_ldma.h
.
Referenced by MIC_init() .
| uint32_t LDMA_Descriptor_t::ignoreSrec |
Ignore single requests.
Definition at line
776
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::immVal |
Data to be written at dstAddr.
Definition at line
841
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::link |
Enable LINKLOAD when transfer is done.
Definition at line
787
of file
em_ldma.h
.
| int32_t LDMA_Descriptor_t::linkAddr |
Address of next (linked) descriptor.
Definition at line
788
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::linkMode |
Select absolute or relative link address.
Definition at line
786
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::matchEn |
Sync trigger match enable.
Definition at line
815
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::matchVal |
Sync trigger match value.
Definition at line
814
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::reqMode |
Block or cycle transfer selector.
Definition at line
774
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::size |
| uint32_t LDMA_Descriptor_t::srcAddr |
DMA source address.
Definition at line
783
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::srcAddrMode |
Source addressing mode.
Definition at line
780
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::srcInc |
Source address increment unit size.
Definition at line
777
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::structReq |
DMA transfer trigger during LINKLOAD.
Definition at line
769
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
767
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
812
of file
em_ldma.h
.
| uint32_t LDMA_Descriptor_t::syncSet |
Set bits in LDMA_CTRL.SYNCTRIG register.
Definition at line
811
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
770
of file
em_ldma.h
.
The documentation for this union was generated from the following file:
-
C:/cygwin/home/caamunds/work/super/platform/emlib/inc/
em_ldma.h