-void dmac_setSourcesLLI(int ch, DmacDesc *lli, uint32_t src, uint32_t dst, uint32_t desc);
-void dmac_configureDmacLLI(int ch, DmacDesc *lli, size_t transfer_size, uint32_t cfg, uint32_t ctrla, uint32_t ctrlb);
-bool dmac_isLLIDone(int ch);
-bool dmac_waitLLIDone(int ch);
-