CS2000_RATIO_0
cs2000_write(chip, CS2000_RATIO_0 + 0, 0x00); /* 1.0 */
cs2000_write(chip, CS2000_RATIO_0 + 1, 0x10);
cs2000_write(chip, CS2000_RATIO_0 + 2, 0x00);
cs2000_write(chip, CS2000_RATIO_0 + 3, 0x00);