FDMA_CH_CMD_OFST
ch_sta = fchan_read(fchan, FDMA_CH_CMD_OFST);
cur_addr = fchan_read(fchan, FDMA_CH_CMD_OFST);
val = fchan_read(fchan, FDMA_CH_CMD_OFST);
fchan_write(fchan, val, FDMA_CH_CMD_OFST);
fchan_write(fchan, ch_cmd, FDMA_CH_CMD_OFST);