IIO data access

You may have guessed that there are only two ways to access data with the IIO framework: one-shot capture through sysfs channels or continuous mode (triggered buffer) through an IIO character device.

One-shot capture

One-shot data capture is done through the sysfs interface. By reading the sysfs entry that corresponds to a channel, you'll capture only the data specific to that channel. Given a temp sensor with two channels, one for the ambient temperature, and the other for the thermocouple temperature:

  # cd /sys/bus/iio/devices/iio:device0
  # cat in_voltage3_raw
  6646
  # cat in_voltage_scale
  0.305175781

The processed value is obtained by multiplying the scale by the raw value:

Voltage value: 6646...