DENC_A_REG_4
DENC_A_REG_4 + (0x100 * i), &tmp);
DENC_A_REG_4 + (0x100 * i), value);
DENC_A_REG_4 + (0x100 * i), &tmp);
DENC_A_REG_4 + (0x100 * i), value);
value = cx25821_i2c_read(&dev->i2c_bus[0], DENC_A_REG_4, &tmp);
status = cx25821_i2c_write(&dev->i2c_bus[0], DENC_A_REG_4, value);