+ HSMCI_DMA |= BV(HSMCI_DMA_DMAEN);
+ HSMCI_BLKR = blk_size << HSMCI_BLKR_BLKLEN_SHIFT;
+
+ uint32_t cfg = BV(DMAC_CFG_DST_H2SEL);
+ uint32_t ctrla = DMAC_CTRLA_SRC_WIDTH_WORD | DMAC_CTRLA_DST_WIDTH_WORD;
+ uint32_t ctrlb = BV(DMAC_CTRLB_SRC_DSCR) | BV(DMAC_CTRLB_DST_DSCR) |
+ DMAC_CTRLB_FC_MEM2PER_DMA_FC |
+ DMAC_CTRLB_DST_INCR_FIXED | DMAC_CTRLB_SRC_INCR_INCREMENTING;
+
+ dmac_setSources(&dmac, (uint32_t)buf, (uint32_t)&HSMCI_TDR);
+ dmac_configureDmac(&dmac, word_num, cfg, ctrla, ctrlb);
+ dmac_start(&dmac);