AD7417_CONFIG
err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, sizeof(buf));
err = ad7417_read_1(dev, addr, AD7417_CONFIG, &buf);
err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, sizeof(buf));
config.reg = AD7417_CONFIG;
err = ad7417_read_1(dev, addr, AD7417_CONFIG, &config.val);