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Onboard LED indicators usage under Linux . You will learn how to control the LEDs.
Device Node | |
---|---|
VIM1/2 | /sys/class/leds/sys_led |
VIM3/3L | /sys/class/leds/red_led |
/sys/class/leds/sys_led | |
VIM4 | /sys/class/leds/pwmled |
Edge1 | /sys/class/leds/red_led |
/sys/class/leds/sys_led |
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 which is a PWM LED.
$ ls /sys/class/leds
pwmled
Edge1 has two nodes.
$ ls /sys/class/leds
read_led sys_led
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.
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.
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.