get_rate
dev->get_rate = 0;
if (dev->get_rate)
return dev->get_rate(dev, reg, rate);
dev->get_rate = ad1819_get_rate;
codec_get_rate get_rate;
printf("Current sample rate is %lu Hz (0x%lx)\n", get_rate(sRate), sRate);
printf("sample rate %lu (0x%lx)\n", get_rate(formatInfo.output.rate),