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This document mainly describes the onboard LEDs. You will learn how to set the LEDs to be on or off, or blink or others.
VIM1/VIM2 has only one node.
$ ls /sys/class/leds
sys_led
VIM3/VIM3L has two nodes.
ls /sys/class/leds red_led sys_led
VIM4 has only one node pwmled.
$ ls /sys/class/leds
pwmled
Edge1 has two nodes.
$ ls /sys/class/leds
read_led sys_led
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.
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.
We will use sys_led as an example:
Set the LED node parameter to none to turn off the LED:
$ echo none | sudo tee /sys/class/leds/sys_led/trigger
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 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.