Application note - fitlet2 controlling front LEDs
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Revision as of 07:38, 9 October 2018 by Tamir (Talk | contribs) (Tamir moved page Controlling LED1 and LED2 to Application note - fitlet2 controlling front LEDs on Linux)
- This document provides an example to control the fitlet2's front LEDs.
- fitlet2 has 2 LEDs, LED1 and LED2. Each of them has GREEN and YELLOW parts that can be controlled separately.
- This document is applicable to fitlet2 running Linux.
Linux
In Linux kernel there are 4 related GPIOs: GPIO435, GPIO436, GPIO437, GPIO438.
- GPIO435 - LED1 GREEN
- GPIO436 - LED1 YELLOW
- GPIO437 - LED2 GREEN
- GPIO438 - LED2 YELLOW
To control the GPIOs need to login as root (root password required):
$ su Password:
To control for example LED1 GREEN part:
$ echo 435 > /sys/class/gpio/export $ echo out > /sys/class/gpio/gpio435/direction $ echo 1 > /sys/class/gpio/gpio435/value # LED1 should be GREEN now $ echo 0 > /sys/class/gpio/gpio435/value # LED1 should be OFF now $ echo 435 > /sys/class/gpio/unexport
The GPIO framework and GPIO sysfs interface are documented in https://www.kernel.org/doc/Documentation/gpio/gpio.txt