MCXA153: LPSPI data burst transfer.

bogdan_u — Sat, 27 Jun 2026 11:44:53 GMT

Hello,

The Reference Manual MCXA153 contains a description of the TDBRn and RDBRn LPSPI registers:
"TDBRn and RDBRn registers supports burst transfers of data to the transmit FIFO for use with the DMA controller".
Can anyone share sample code for a burst transfer using these registers?

best regards
Bogdan

Re: MCXA153: LPSPI data burst transfer.

Harry_Zhang — Wed, 01 Jul 2026 03:04:58 GMT

Hi @bogdan_u

Sorry, there are currently no relevant examples available.

The closest MCXA153 example I found uses LPSPI_MasterTransferEDMALite() with eDMA, but the driver targets TDR/RDR via LPSPI_GetTxRegisterAddress() / LPSPI_GetRxRegisterAddress() , not the burst alias window.

But i think you can try to use.

typedef struct { uint32_t cmd; uint32_t data[128]; } lpspi_burst_tx_t;

static inline uint32_t LPSPI_TCBR_Address(LPSPI_Type *base) { return ((uint32_t)base + LPSPI_TCBR_OFFSET); } static inline uint32_t LPSPI_TDBR0_Address(LPSPI_Type *base) { return ((uint32_t)base + LPSPI_TDBR0_OFFSET); } static inline uint32_t LPSPI_RDBR0_Address(LPSPI_Type *base) { return ((uint32_t)base + LPSPI_RDBR0_OFFSET); } void LPSPI_StartTxBurstDMA(LPSPI_Type *base, edma_handle_t *txDmaHandle, uint32_t *cmd_plus_data, uint32_t nwords) { edma_transfer_config_t cfg = {0}; cfg.srcAddr = (uint32_t)&cmd_plus_data[0]; cfg.destAddr = LPSPI_TCBR_Address(base); cfg.srcOffset = 4; cfg.destOffset = 4; cfg.srcTransferSize = kEDMA_TransferSize4Bytes; cfg.destTransferSize = kEDMA_TransferSize4Bytes; cfg.minorLoopBytes = 4; cfg.majorLoopCounts = nwords + 1u; EDMA_ResetChannel(txDmaHandle->base, txDmaHandle->channel); EDMA_SetTransferConfig(txDmaHandle->base, txDmaHandle->channel, &cfg, NULL); EDMA_StartTransfer(txDmaHandle); LPSPI_EnableDMA(base, kLPSPI_TxDmaEnable); } void LPSPI_StartRxBurstDMA(LPSPI_Type *base, edma_handle_t *rxDmaHandle, uint32_t *rx_words, uint32_t nwords) { edma_transfer_config_t cfg = {0}; cfg.srcAddr = LPSPI_RDBR0_Address(base); cfg.destAddr = (uint32_t)&rx_words[0]; cfg.srcOffset = 4; cfg.destOffset = 4; cfg.srcTransferSize = kEDMA_TransferSize4Bytes; cfg.destTransferSize = kEDMA_TransferSize4Bytes; cfg.minorLoopBytes = 4; cfg.majorLoopCounts = nwords; EDMA_ResetChannel(rxDmaHandle->base, rxDmaHandle->channel); EDMA_SetTransferConfig(rxDmaHandle->base, rxDmaHandle->channel, &cfg, NULL); EDMA_StartTransfer(rxDmaHandle); LPSPI_EnableDMA(base, kLPSPI_RxDmaEnable); }

Harry

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MCXA153: LPSPI data burst transfer.

Re: MCXA153: LPSPI data burst transfer.