IIO Linux kernel tools

Summary
Linux^® kernel provides some user space tools that can be used for testing the IIO subsystem.

1 Article purpose

The purpose of this article is to:

• briefly introduce the IIO user space tools that comes with the Linux^® kernel
• provide a few examples using these tools

2 Introduction

These tools use IIO sysfs and character device directly without libiio (See IIO user space interface for further details).

3 Tools

The Linux^® kernel provides the following IIO user space tools:

• lsiio: example application that provides a list of IIO devices and triggers.

root@stm32mp1:~# lsiio
Device 001: 48003000.adc:adc@100
Device 000: 48003000.adc:adc@0
Trigger 018: tim3_ch4
Trigger 007: tim1_ch3
...

• iio_event_monitor: example application that reads events from an IIO device and prints them.
  See How to get ADC analog watchdog events.

root@stm32mp1:~# iio_event_monitor /dev/iio:device0 &
Event: time: 1529352199639112110, type: voltage, channel: 0, evtype: thresh, direction: either
Event: time: ...

• iio_generic_buffer: example application that reads data from buffer.
• iio_utils: set of routines built-in above IIO tools, typically used to access sysfs files.

4 Source code

The Linux^® kernel IIO tools source code can be found under tools/iio directory:

• tools/iio/lsiio.c
• tools/iio/iio_event_monitor.c
• tools/iio/iio_generic_buffer.c
• tools/iio/iio_utils.c

5 Installation on your target

The Linux^® kernel IIO tools aren't embedded by default in OpenSTLinux distribution. They can be compiled independently and then installed on the target. See How to build Linux kernel user space tools.

6 References

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