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Table of Contents
LED
Introduction
Onboard LED indicators usage under Linux . You will learn how to control the LEDs.
Device LED configurations
| Device | Device Node | LED color |
|---|---|---|
| VIM1/2 | /sys/class/leds/sys_led | White |
| VIM3/3L | /sys/class/leds/red_led | Red |
| /sys/class/leds/sys_led | ||
| VIM4 | /sys/class/leds/pwmled | |
| Edge1 | /sys/class/leds/red_led | |
| /sys/class/leds/sys_led |
Setup LED
VIM1/2/3/3L
We will take sys_led (white) as an example.
Turn off
Set the LED node parameter to none to turn off the LED:
$ echo none | sudo tee /sys/class/leds/sys_led/trigger
Turn on
Set the LED node parameter to default-on to keep the LED permanently on:
$ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
Set LED heartbeat
Set the LED node parameter to heartbeat, to make the LED flash with a heartbeat blink:
$ echo heartbeat > /sys/class/leds/sys_led/trigger
You can also try other parameters.
VIM4
We will take pwmled (white) as an example.
Turn off
Set the LED node parameter to none to turn off the LED:
$ echo none | sudo tee /sys/class/leds/pwmled/trigger
Turn on
Set the LED node parameter to default-on, to make the LED permanently on:
$ echo default-on | sudo tee /sys/class/leds/pwmled/trigger
Set LED heartbeat
Set the LED node parameter to heartbeat, to make the LED flash with a heartbeat blink:
$ echo heartbeat > /sys/class/leds/pwmled/trigger
You can also experiment with other parameters.
Edge1
We will use sys_led as an example:
Turn off
Set the LED node parameter to none to turn off the LED:
$ echo none | sudo tee /sys/class/leds/sys_led/trigger
Turn on
Set the LED node parameter to default-on to keep the LED permanently on:
$ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
Set LED heartbeat
Set the LED node parameter to heartbeat, to make the LED flash with a heartbeat blink:
$ echo heartbeat > /sys/class/leds/sys_led/trigger
You can also experiment with other parameters.