LDMA_DescriptorExtend_t Struct Reference
DMA extended descriptor.
#include <em_ldma.h>
Data Fields | |
| uint32_t | structType: 2 |
| Set to 0 to select XFER descriptor type. | |
| uint32_t | extend: 1 |
| Extend data structure. | |
| uint32_t | structReq: 1 |
| DMA transfer trigger during LINKLOAD. | |
| 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. | |
| uint32_t | reqMode: 1 |
| Block or cycle transfer selector. | |
| uint32_t | decLoopCnt: 1 |
| Enable looped transfers. | |
| uint32_t | ignoreSrec: 1 |
| Ignore single requests. | |
| uint32_t | srcInc: 2 |
| Source address increment unit size. | |
| uint32_t | size: 2 |
| DMA transfer unit size. | |
| uint32_t | dstInc: 2 |
| Destination address increment unit size. | |
| uint32_t | srcAddrMode: 1 |
| Source addressing mode. | |
| uint32_t | dstAddrMode: 1 |
| Destination addressing mode. | |
| uint32_t | srcAddr |
| DMA source address. | |
| uint32_t | dstAddr |
| DMA destination address. | |
| uint32_t | linkMode: 1 |
| Select absolute or relative link address. | |
| uint32_t | link: 1 |
| Enable LINKLOAD when transfer is done. | |
| int32_t | linkAddr: 30 |
| Address of next (linked) descriptor. | |
| uint32_t | reserved1: 4 |
| Reserved | |
| uint32_t | dstIlEn: 1 |
| Destination interleave. | |
| uint32_t | IlMode: 2 |
| Interleave mode. | |
| uint32_t | bufferable: 1 |
| Reserved | |
| uint32_t | reserved2: 24 |
| Allow AHB buffering. | |
| uint32_t | reserved3 |
| Reserved | |
| uint32_t | IlSrc |
| DMA rules table base address in memory. | |
DMA extended descriptor.
The extended descriptor adds additional fields for the extended features available on the MMLDMA peripheral: destination interleaving and bufferable. The same three different DMA descriptors supported by the LDMA DMA controller are available. Each consists of seven WORDs (instead of four in non-extended descriptors) which map directly onto HW control registers for a given DMA channel. The three descriptor types are XFER, SYNC and WRI. But the extended fields are true only for XFER. The extended fields are the following:
+- +- CTRL
| Original | SRC
| Structure | DST
Extended | +- LINK Structure | XCTRL | Reserved for future usage +- ILSRC
Refer to the reference manual for further information.
Field Documentation
◆ structType
| uint32_t LDMA_DescriptorExtend_t::structType |
Set to 0 to select XFER descriptor type.
◆ extend
| uint32_t LDMA_DescriptorExtend_t::extend |
Extend data structure.
◆ structReq
| uint32_t LDMA_DescriptorExtend_t::structReq |
DMA transfer trigger during LINKLOAD.
◆ xferCnt
| uint32_t LDMA_DescriptorExtend_t::xferCnt |
Transfer count minus one.
◆ byteSwap
| uint32_t LDMA_DescriptorExtend_t::byteSwap |
Enable byte swapping transfers.
◆ blockSize
| uint32_t LDMA_DescriptorExtend_t::blockSize |
Number of unit transfers per arbitration cycle.
◆ doneIfs
| uint32_t LDMA_DescriptorExtend_t::doneIfs |
Generate interrupt when done.
◆ reqMode
| uint32_t LDMA_DescriptorExtend_t::reqMode |
Block or cycle transfer selector.
◆ decLoopCnt
| uint32_t LDMA_DescriptorExtend_t::decLoopCnt |
Enable looped transfers.
◆ ignoreSrec
| uint32_t LDMA_DescriptorExtend_t::ignoreSrec |
Ignore single requests.
◆ srcInc
| uint32_t LDMA_DescriptorExtend_t::srcInc |
Source address increment unit size.
◆ size
| uint32_t LDMA_DescriptorExtend_t::size |
DMA transfer unit size.
◆ dstInc
| uint32_t LDMA_DescriptorExtend_t::dstInc |
Destination address increment unit size.
◆ srcAddrMode
| uint32_t LDMA_DescriptorExtend_t::srcAddrMode |
Source addressing mode.
◆ dstAddrMode
| uint32_t LDMA_DescriptorExtend_t::dstAddrMode |
Destination addressing mode.
◆ srcAddr
| uint32_t LDMA_DescriptorExtend_t::srcAddr |
DMA source address.
◆ dstAddr
| uint32_t LDMA_DescriptorExtend_t::dstAddr |
DMA destination address.
◆ linkMode
| uint32_t LDMA_DescriptorExtend_t::linkMode |
Select absolute or relative link address.
◆ link
| uint32_t LDMA_DescriptorExtend_t::link |
Enable LINKLOAD when transfer is done.
◆ linkAddr
| int32_t LDMA_DescriptorExtend_t::linkAddr |
Address of next (linked) descriptor.
◆ reserved1
| uint32_t LDMA_DescriptorExtend_t::reserved1 |
Reserved
◆ dstIlEn
| uint32_t LDMA_DescriptorExtend_t::dstIlEn |
Destination interleave.
◆ IlMode
| uint32_t LDMA_DescriptorExtend_t::IlMode |
Interleave mode.
◆ bufferable
| uint32_t LDMA_DescriptorExtend_t::bufferable |
Reserved
◆ reserved2
| uint32_t LDMA_DescriptorExtend_t::reserved2 |
Allow AHB buffering.
◆ reserved3
| uint32_t LDMA_DescriptorExtend_t::reserved3 |
Reserved
◆ IlSrc
| uint32_t LDMA_DescriptorExtend_t::IlSrc |
DMA rules table base address in memory.