Difference between revisions of "FAQ:fitlet2"

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(How to Control fitlet2 front LEDs?)   (change visibility)
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https://www.kernel.org/doc/Documentation/gpio/gpio.txt
 
https://www.kernel.org/doc/Documentation/gpio/gpio.txt
  
==software==
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==Software==
  
  

Revision as of 09:08, 13 March 2018

General

Hardware

How to control fitlet2 front LEDs?

fitlet2 has 2 LEDs, LED1 and LED2. Each of them has GREEN and YELLOW parts that can be controlled separately.

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

Software