AXI_DMAC_REG_TRANSFER_DONE
xfer_done = axi_dmac_read(dmac, AXI_DMAC_REG_TRANSFER_DONE);
completed = axi_dmac_read(dmac, AXI_DMAC_REG_TRANSFER_DONE);
case AXI_DMAC_REG_TRANSFER_DONE: