CRFA
write_chan(dev, CRFA, 2, 0);
offset = read_chan(dev, CRFA, 2);
write_chan(dev, CRFA, i, 0);
write_reg(dev, CRFA, 0, 0);
offset = read_reg(dev, CRFA, 0);
write_reg(dev, CRFA, i, 0);