+
+ uint32_t cfg = BV(DMAC_CFG_DST_H2SEL) |
+ ((3 << DMAC_CFG_DST_PER_SHIFT) & DMAC_CFG_DST_PER_MASK) | (3 & DMAC_CFG_SRC_PER_MASK);
+ uint32_t ctrla = DMAC_CTRLA_SRC_WIDTH_HALF_WORD | DMAC_CTRLA_DST_WIDTH_HALF_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)&SSC_THR);
+ dmac_configureDmac(&dmac, len, cfg, ctrla, ctrlb);
+ dmac_start(&dmac);
+
+ SSC_CR = BV(SSC_TXEN);