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.
Public Attributes#
Set to 0 to select XFER descriptor type.
Extend data structure.
DMA transfer trigger during LINKLOAD.
Transfer count minus one.
Enable byte swapping transfers.
Number of unit transfers per arbitration cycle.
Generate interrupt when done.
Block or cycle transfer selector.
Enable looped transfers.
Ignore single requests.
Source address increment unit size.
DMA transfer unit size.
Destination address increment unit size.
Source addressing mode.
Destination addressing mode.
DMA source address.
DMA destination address.
Select absolute or relative link address.
Enable LINKLOAD when transfer is done.
Address of next (linked) descriptor.
Reserved
Destination interleave.
Interleave mode.
Allow AHB buffering.
Reserved
Reserved
DMA rules table base address in memory.
Public Attribute Documentation#
structType#
uint32_t LDMA_DescriptorExtend_t::structType
Set to 0 to select XFER descriptor type.
1016 of file platform/emlib/inc/em_ldma.hextend#
uint32_t LDMA_DescriptorExtend_t::extend
Extend data structure.
1017 of file platform/emlib/inc/em_ldma.hstructReq#
uint32_t LDMA_DescriptorExtend_t::structReq
DMA transfer trigger during LINKLOAD.
1018 of file platform/emlib/inc/em_ldma.hxferCnt#
uint32_t LDMA_DescriptorExtend_t::xferCnt
Transfer count minus one.
1019 of file platform/emlib/inc/em_ldma.hbyteSwap#
uint32_t LDMA_DescriptorExtend_t::byteSwap
Enable byte swapping transfers.
1020 of file platform/emlib/inc/em_ldma.hblockSize#
uint32_t LDMA_DescriptorExtend_t::blockSize
Number of unit transfers per arbitration cycle.
1021 of file platform/emlib/inc/em_ldma.hdoneIfs#
uint32_t LDMA_DescriptorExtend_t::doneIfs
Generate interrupt when done.
1022 of file platform/emlib/inc/em_ldma.hreqMode#
uint32_t LDMA_DescriptorExtend_t::reqMode
Block or cycle transfer selector.
1023 of file platform/emlib/inc/em_ldma.hdecLoopCnt#
uint32_t LDMA_DescriptorExtend_t::decLoopCnt
Enable looped transfers.
1024 of file platform/emlib/inc/em_ldma.hignoreSrec#
uint32_t LDMA_DescriptorExtend_t::ignoreSrec
Ignore single requests.
1025 of file platform/emlib/inc/em_ldma.hsrcInc#
uint32_t LDMA_DescriptorExtend_t::srcInc
Source address increment unit size.
1026 of file platform/emlib/inc/em_ldma.hsize#
uint32_t LDMA_DescriptorExtend_t::size
DMA transfer unit size.
1027 of file platform/emlib/inc/em_ldma.hdstInc#
uint32_t LDMA_DescriptorExtend_t::dstInc
Destination address increment unit size.
1028 of file platform/emlib/inc/em_ldma.hsrcAddrMode#
uint32_t LDMA_DescriptorExtend_t::srcAddrMode
Source addressing mode.
1029 of file platform/emlib/inc/em_ldma.hdstAddrMode#
uint32_t LDMA_DescriptorExtend_t::dstAddrMode
Destination addressing mode.
1030 of file platform/emlib/inc/em_ldma.hsrcAddr#
uint32_t LDMA_DescriptorExtend_t::srcAddr
DMA source address.
1032 of file platform/emlib/inc/em_ldma.hdstAddr#
uint32_t LDMA_DescriptorExtend_t::dstAddr
DMA destination address.
1033 of file platform/emlib/inc/em_ldma.hlinkMode#
uint32_t LDMA_DescriptorExtend_t::linkMode
Select absolute or relative link address.
1035 of file platform/emlib/inc/em_ldma.hlink#
uint32_t LDMA_DescriptorExtend_t::link
Enable LINKLOAD when transfer is done.
1036 of file platform/emlib/inc/em_ldma.hlinkAddr#
int32_t LDMA_DescriptorExtend_t::linkAddr
Address of next (linked) descriptor.
1037 of file platform/emlib/inc/em_ldma.hreserved1#
uint32_t LDMA_DescriptorExtend_t::reserved1
Reserved
1039 of file platform/emlib/inc/em_ldma.hdstIlEn#
uint32_t LDMA_DescriptorExtend_t::dstIlEn
Destination interleave.
1040 of file platform/emlib/inc/em_ldma.hIlMode#
uint32_t LDMA_DescriptorExtend_t::IlMode
Interleave mode.
1041 of file platform/emlib/inc/em_ldma.hbufferable#
uint32_t LDMA_DescriptorExtend_t::bufferable
Allow AHB buffering.
1042 of file platform/emlib/inc/em_ldma.hreserved2#
uint32_t LDMA_DescriptorExtend_t::reserved2
Reserved
1043 of file platform/emlib/inc/em_ldma.hreserved3#
uint32_t LDMA_DescriptorExtend_t::reserved3
Reserved
1045 of file platform/emlib/inc/em_ldma.hIlSrc#
uint32_t LDMA_DescriptorExtend_t::IlSrc
DMA rules table base address in memory.
1046 of file platform/emlib/inc/em_ldma.h