dmac_start
static void dmac_start(uint8_t channel_no, struct dmac_xfer_state*);
dmac_start(channel_no, dxs);
dmac_start(channel_no, dxs);
dmac_start(sc, DMAC_PRIORITY_HIGH);
dmac_start(sc, DMAC_PRIORITY_MED);
dmac_start(sc, DMAC_PRIORITY_LOW);
dmac_start(sc, DMAC_PRIORITY_NORMAL);
static void dmac_start(struct pxadmac_softc *, dmac_priority_t);
dmac_start(sc, DMAC_PRI(dxs->dxs_priority));
dmac_start(sc, DMAC_PRI(dxs->dxs_priority));