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Table of Contents
LED
Introduction
This document mainly describes the onboard LEDs. You will learn how to set the LEDs to be on or off, or blink or others.
LED Nodes
VIM1/2
VIM1/VIM2 has only one node.
$ ls /sys/class/leds sys_led
VIM3/3L
VIM3/VIM3L has two nodes.
ls /sys/class/leds red_led sys_led
VIM4
VIM4 has only one node pwmled.
$ ls /sys/class/leds pwmled
Edge1
Edge1 has two nodes.
$ ls /sys/class/leds read_led sys_led
Edge2
Setup LED
VIM1/2/3/3L
We will use 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 experiment with other parameters.
VIM4
Lets use 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 heartbeat, to make the LED flash with a heartbeat rhythm:
$ echo heartbeat | 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.