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EFM32 Jade Gecko 1 Software Documentation
efm32jg1-doc-5.1.2
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EFM32 Jade Gecko 1 Software Documentation
efm32jg1-doc-5.1.2
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DMA descriptor.
The LDMA DMA controller supports three different DMA descriptors. Each consist of four WORD's 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.
#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 |
| uint32_t LDMA_Descriptor_t::blockSize |
| uint32_t LDMA_Descriptor_t::byteSwap |
| uint32_t LDMA_Descriptor_t::decLoopCnt |
| uint32_t LDMA_Descriptor_t::doneIfs |
| uint32_t LDMA_Descriptor_t::dstAddr |
| uint32_t LDMA_Descriptor_t::dstAddrMode |
| uint32_t LDMA_Descriptor_t::dstInc |
| uint32_t LDMA_Descriptor_t::ignoreSrec |
| uint32_t LDMA_Descriptor_t::immVal |
| uint32_t LDMA_Descriptor_t::link |
| int32_t LDMA_Descriptor_t::linkAddr |
| uint32_t LDMA_Descriptor_t::linkMode |
| uint32_t LDMA_Descriptor_t::matchEn |
| uint32_t LDMA_Descriptor_t::matchVal |
| uint32_t LDMA_Descriptor_t::reqMode |
| uint32_t LDMA_Descriptor_t::srcAddrMode |
| uint32_t LDMA_Descriptor_t::srcInc |
| uint32_t LDMA_Descriptor_t::structReq |
| uint32_t LDMA_Descriptor_t::structType |
| struct { ... } LDMA_Descriptor_t::sync |
SYNCHRONIZE DMA descriptor, used for intra channel transfer syncronization.
| uint32_t LDMA_Descriptor_t::syncClr |
| uint32_t LDMA_Descriptor_t::syncSet |
| 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.
| uint32_t LDMA_Descriptor_t::xferCnt |
1.8.10 
