ST1202_CHAN_ENABLE_LOW
ret = st1202_read_reg(chip, ST1202_CHAN_ENABLE_LOW, &chan_low);
ret = st1202_write_reg(chip, ST1202_CHAN_ENABLE_LOW, chan_low);
ret = st1202_write_reg(chip, ST1202_CHAN_ENABLE_LOW, ST1202_CHAN_DISABLE_ALL);