If deviceX supports triggered sampling, it’s a so called trigger consumer and there will be an additional folder /sys/bus/iio/device/iio:deviceX/trigger. In this folder there is a file called current_trigger, allowing controlling and viewing the current trigger source connected to deviceX. Available trigger sources can be identified by reading the name file /sys/bus/iio/devices/triggerY/name. The same trigger source can connect to multiple devices, so a single trigger may initialize data capture or reading from a number of sensors, converters, etc.

Tip

Trigger Consumers: Currently triggers are only used for the filling of software ring buffers and as such any device supporting INDIO_RING_TRIGGERED has the consumer interface automatically created.

Description: Read name of triggerY

/sys/bus/iio/devices/triggerY$

cat name irqtrig56

Description: Make irqtrig56 (trigger using system IRQ56, likely a GPIO IRQ), to current trigger of deviceX

/sys/bus/iio/devices/iio:deviceX/trigger$

echo irqtrig56 > current_trigger

Description: Read current trigger source of deviceX

/sys/bus/iio/devices/iio:deviceX/trigger$

cat current_trigger irqtrig56