LDMA_Descriptor_t Union Reference
DMA descriptor.
#include <em_ldma.h>
Data Fields |
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| struct { | |
| uint32_t structType : 2 | |
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Set to 0 to select XFER descriptor type.
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| uint32_t reserved0 : 1 | |
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Reserved
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| uint32_t structReq : 1 | |
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DMA transfer trigger during LINKLOAD.
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| uint32_t xferCnt : 11 | |
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Transfer count minus one.
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| uint32_t byteSwap : 1 | |
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Enable byte swapping transfers.
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| uint32_t blockSize : 4 | |
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Number of unit transfers per arbitration cycle.
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| uint32_t doneIfs : 1 | |
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Generate interrupt when done.
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| uint32_t reqMode : 1 | |
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Block or cycle transfer selector.
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| uint32_t decLoopCnt : 1 | |
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Enable looped transfers.
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| uint32_t ignoreSrec : 1 | |
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Ignore single requests.
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| uint32_t srcInc : 2 | |
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Source address increment unit size.
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| uint32_t size : 2 | |
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DMA transfer unit size.
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| uint32_t dstInc : 2 | |
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Destination address increment unit size.
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| uint32_t srcAddrMode : 1 | |
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Source addressing mode.
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| uint32_t dstAddrMode : 1 | |
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Destination addressing mode.
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| uint32_t srcAddr | |
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DMA source address.
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| uint32_t dstAddr | |
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DMA destination address.
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| uint32_t linkMode : 1 | |
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Select absolute or relative link address.
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| uint32_t link : 1 | |
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Enable LINKLOAD when transfer is done.
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| int32_t linkAddr : 30 | |
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Address of next (linked) descriptor.
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| } | xfer |
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TRANSFER DMA descriptor, this is the only descriptor type which can be used to start a DMA transfer.
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| struct { | |
| uint32_t structType : 2 | |
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Set to 1 to select SYNC descriptor type.
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| uint32_t reserved0 : 1 | |
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Reserved.
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| uint32_t structReq : 1 | |
|
DMA transfer trigger during LINKLOAD.
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| uint32_t xferCnt : 11 | |
|
Transfer count minus one.
|
|
| uint32_t byteSwap : 1 | |
|
Enable byte swapping transfers.
|
|
| uint32_t blockSize : 4 | |
|
Number of unit transfers per arbitration cycle.
|
|
| uint32_t doneIfs : 1 | |
|
Generate interrupt when done.
|
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| uint32_t reqMode : 1 | |
|
Block or cycle transfer selector.
|
|
| uint32_t decLoopCnt : 1 | |
|
Enable looped transfers.
|
|
| uint32_t ignoreSrec : 1 | |
|
Ignore single requests.
|
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| uint32_t srcInc : 2 | |
|
Source address increment unit size.
|
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| uint32_t size : 2 | |
|
DMA transfer unit size.
|
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| uint32_t dstInc : 2 | |
|
Destination address increment unit size.
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| uint32_t srcAddrMode : 1 | |
|
Source addressing mode.
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| uint32_t dstAddrMode : 1 | |
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Destination addressing mode.
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| uint32_t syncSet : 8 | |
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Set bits in LDMA_CTRL.SYNCTRIG register.
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| uint32_t syncClr : 8 | |
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Clear bits in LDMA_CTRL.SYNCTRIG register.
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| uint32_t reserved3 : 16 | |
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Reserved.
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| uint32_t matchVal : 8 | |
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Sync trigger match value.
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| uint32_t matchEn : 8 | |
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Sync trigger match enable.
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| uint32_t reserved4 : 16 | |
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Reserved.
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| uint32_t linkMode : 1 | |
|
Select absolute or relative link address.
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| uint32_t link : 1 | |
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Enable LINKLOAD when transfer is done.
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| int32_t linkAddr : 30 | |
|
Address of next (linked) descriptor.
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| } | sync |
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SYNCHRONIZE DMA descriptor, used for intra channel transfer synchronization.
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| struct { | |
| uint32_t structType : 2 | |
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Set to 2 to select WRITE descriptor type.
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| uint32_t reserved0 : 1 | |
|
Reserved.
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| uint32_t structReq : 1 | |
|
DMA transfer trigger during LINKLOAD.
|
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| uint32_t xferCnt : 11 | |
|
Transfer count minus one.
|
|
| uint32_t byteSwap : 1 | |
|
Enable byte swapping transfers.
|
|
| uint32_t blockSize : 4 | |
|
Number of unit transfers per arbitration cycle.
|
|
| uint32_t doneIfs : 1 | |
|
Generate interrupt when done.
|
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| uint32_t reqMode : 1 | |
|
Block or cycle transfer selector.
|
|
| uint32_t decLoopCnt : 1 | |
|
Enable looped transfers.
|
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| uint32_t ignoreSrec : 1 | |
|
Ignore single requests.
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| uint32_t srcInc : 2 | |