Difference between revisions of "Application note - fitlet2 controlling front LEDs"
From fit-PC wiki
(Created page with "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, GPI...") (change visibility) |
|||
Line 1: | Line 1: | ||
fitlet2 has 2 LEDs, LED1 and LED2. Each of them has GREEN and YELLOW parts that can be controlled separately. | fitlet2 has 2 LEDs, LED1 and LED2. Each of them has GREEN and YELLOW parts that can be controlled separately. | ||
+ | == Linux == | ||
In Linux kernel there are 4 related GPIOs: GPIO435, GPIO436, GPIO437, GPIO438. | In Linux kernel there are 4 related GPIOs: GPIO435, GPIO436, GPIO437, GPIO438. | ||
Line 23: | Line 24: | ||
The GPIO framework and GPIO sysfs interface are documented in | The GPIO framework and GPIO sysfs interface are documented in | ||
https://www.kernel.org/doc/Documentation/gpio/gpio.txt | https://www.kernel.org/doc/Documentation/gpio/gpio.txt | ||
+ | |||
+ | [[category:fitlet2]] |
Revision as of 08:09, 21 March 2018
fitlet2 has 2 LEDs, LED1 and LED2. Each of them has GREEN and YELLOW parts that can be controlled separately.
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