write_max2820
write_max2820(dev, 3, chan);
write_max2820(dev, 1, 0);
write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
write_max2820(dev, 1, 0x01e); /* enable register */
write_max2820(dev, 2, 0x001); /* synt register */
write_max2820(dev, 4, 0x313); /* rx register */
write_max2820(dev, 5, 0x00f);