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--- products:sbc:common:applications:gpio:led [2022/07/04 02:41]
frank old revision restored (2022/07/04 13:00)
+++ products:sbc:common:applications:gpio:led [2023/11/07 03:23] (current)
nick
@@ Line 1: / Line 1: @@
+~~tag>LED linux~~
 ====== LED ======
+===== Introduction =====
+/*
+This page mainly describes the onboard LEDs and leads you to control the LEDs.
+*/
+This page introduces the usage of Onboard LED indicators under Linux, and leads you to control the LEDs.
+===== Device LED configurations =====
-===== LED Nodes =====
+^  Device      ^  Node name                  ^  LED color  ^
+^  VIM1/2      |  /sys/class/leds/sys_led    |  White      |
+^  VIM3/3L     |  /sys/class/leds/red_led    |  Red        |
+|  :::         |  /sys/class/leds/sys_led    |             |
+^  VIM1S/VIM4  |  /sys/class/leds/pwmled     |             |
+^  Edge1       |  /sys/class/leds/red_led    |             |
+|  :::         |  /sys/class/leds/sys_led    |             |
+^  Edge2       |  /sys/class/leds/red_led    |  Red        |
+|  :::         |  /sys/class/leds/green_led  |  Green      |
+|  :::         |  /sys/class/leds/blue_led   |  Blue       |
-<tabbox VIM1/2>
-VIM1/VIM2 has only one node.
+===== Setup LED =====
-<code bash>
+<tabbox VIM1/2/3/3L>
-$ ls /sys/class/leds
-sys_led
-</code>
-<tabbox VIM3/3L>
+We will take ''sys_led'' (white) as an example.
-VIM3/VIM3L has two nodes.
+**Turn off**
-<code bash>
+Set the LED node parameter to ''none'' to turn off the LED:
-ls /sys/class/leds
-red_led  sys_led
-</code>
-<tabbox VIM4>
+```shell
+$ echo none | sudo tee /sys/class/leds/sys_led/trigger
+```
-VIM4 has only one node pwmled.
+**Turn on**
-<code bash>
+Set the LED node parameter to ''default-on'' to keep the LED permanently on:
-$ ls /sys/class/leds
-pwmled
-</code>
-<tabbox Edge2>
+```shell
+$ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
+```
-</tabbox>
+**Set LED heartbeat**
-===== Setup LED =====
+Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:
-<tabbox VIM1/2/3/3L>
+```shell
+$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger
+```
-We will use sys_led (white) as an example.
+You can also experiment with other parameters.
-  * Turn off
+<tabbox VIM1S/VIM4>
-Set the LED node parameter to none to turn off the LED:
+We will take ''pwmled'' (white) as an example.
-<code bash>
+**Turn off**
-$ echo none | sudo tee /sys/class/leds/sys_led/trigger
-</code>
-  * Turn on
+Set the LED node parameter to ''none'' to turn off the LED:
-Set the LED node parameter to default-on to keep the LED permanently on:
+```shell
+$ echo none | sudo tee /sys/class/leds/pwmled/trigger
+```
-<code bash>
+**Turn on**
-$ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
-</code>
-  * Set LED heartbeat
+Set the LED node parameter to ''default-on'', to make the LED permanently on:
-Set the LED node parameter to heartbeat, to make the LED flash with a heartbeat blink:
+```shell
+$ echo default-on | sudo tee /sys/class/leds/pwmled/trigger
+```
-<code bash>
-$ echo heartbeat > /sys/class/leds/sys_led/trigger
-</code>
-You can also experiment with other parameters.
+**Set LED heartbeat**
-<tabbox VIM4>
+Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:
-Lets use pwmled (white) as an example.
+```shell
+$ echo heartbeat | sudo tee /sys/class/leds/pwmled/trigger
+```
-  * Turn off
+You can also experiment with other parameters.
-Set the LED node parameter to none to turn off the LED:
+<tabbox Edge1>
-<code bash>
+We will use ''sys_led'' as an example:
-$ echo none | sudo tee /sys/class/leds/pwmled/trigger
-</code>
-  * Turn on
+**Turn off**
-Set the LED node parameter to heartbeat, to make the LED flash with a heartbeat rhythm:
+Set the LED node parameter to ''none'' to turn off the LED:
-<code bash>
+```shell
-$ echo heartbeat | sudo tee /sys/class/leds/pwmled/trigger
+$ echo none | sudo tee /sys/class/leds/sys_led/trigger
-</code>
+```
+**Turn on**
-  * Set LED heartbeat
+Set the LED node parameter to ''default-on'' to keep the LED permanently on:
-Set the LED node parameter to heartbeat, to make the LED flash with a heartbeat blink:
+```shell
+$ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
+```
+**Set LED heartbeat**
-<code bash>
+Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:
-$ echo heartbeat > /sys/class/leds/pwmled/trigger
-</code>
+```shell
+$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger
+```
 You can also experiment with other parameters.
 <tabbox Edge2>
+We will use ''red_led'' as an example:
+**Turn off**
+Set the LED node parameter to ''none'' to turn off the LED:
+```shell
+$ echo none | sudo tee /sys/class/leds/red_led/trigger
+```
+**Turn on**
+Set the LED node parameter to ''default-on'' to keep the LED permanently on:
+```shell
+$ echo default-on | sudo tee /sys/class/leds/red_led/trigger
+```
+**Set LED heartbeat**
+Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:
+```shell
+$ echo heartbeat | sudo tee /sys/class/leds/red_led/trigger
+```
+The others are similar.
+You can also experiment with other parameters.
 </tabbox>

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