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--- products:sbc:common:applications:gpio:led [2022/07/12 23:52]
nick [Table]
+++ products:sbc:common:applications:gpio:led [2023/11/07 03:22]
nick
@@ Line 4: / Line 4: @@
 ===== Introduction =====
 /*
-This document mainly describes the onboard LEDs. You will learn how to control the LEDs.
+This page mainly describes the onboard LEDs and leads you to control the LEDs.
 */
-Onboard LED indicators usage under Linux . You will learn how to control the LEDs.
+This page introduces the usage of Onboard LED indicators under Linux, and leads you to control the LEDs.
-===== LED Information =====
+===== Device LED configurations =====
-|                  ^  Device Node              ^
+^  Device      ^  Node name                  ^  LED color  ^
-^  VIM1/2 VIM3/3L  |  /sys/class/leds/sys_led  |
+^  VIM1/2      |  /sys/class/leds/sys_led    |  White      |
-^  :::             |  /sys/class/leds/red_led  |
+^  VIM3/3L     |  /sys/class/leds/red_led    |  Red        |
-| :::              |                           |
+|  :::         |  /sys/class/leds/sys_led    |             |
-|                  |                           |
+^  VIM1S/VIM4  |  /sys/class/leds/pwmled     |             |
-^  VIM4            |  /sys/class/leds/pwmled   |
+^  Edge1       |  /sys/class/leds/red_led    |             |
-^  Edge1           | /sys/class/leds/red_led   |
+|  :::         |  /sys/class/leds/sys_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.
-```shell
-$ ls /sys/class/leds
-sys_led
-```
-<tabbox VIM3/3L>
-VIM3/VIM3L has two nodes.
-```shell
-$ ls /sys/class/leds
-red_led  sys_led
-```
-<tabbox VIM4>
-VIM4 has only one node which is a PWM LED.
-```shell
-$ ls /sys/class/leds
-pwmled
-```
-<tabbox Edge1>
-Edge1 has two nodes.
-```shell
-$ ls /sys/class/leds
-read_led  sys_led
-```
-<tabbox Edge2>
-</tabbox>
 ===== Setup LED =====
@@ Line 87: / Line 49: @@
 ```shell
-$ echo heartbeat > /sys/class/leds/sys_led/trigger
+$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger
 ```
-You can also try other parameters.
+You can also experiment with other parameters.
-<tabbox VIM4>
+<tabbox VIM1S/VIM4>
 We will take ''pwmled'' (white) as an example.
@@ Line 118: / Line 80: @@
 ```shell
-$ echo heartbeat > /sys/class/leds/pwmled/trigger
+$ echo heartbeat | sudo tee /sys/class/leds/pwmled/trigger
 ```
@@ Line 125: / Line 87: @@
 <tabbox Edge1>
-We will use sys_led as an example:
+We will use ''sys_led'' as an example:
 **Turn off**
@@ Line 147: / Line 109: @@
 ```shell
-$ echo heartbeat > /sys/class/leds/sys_led/trigger
+$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger
 ```
@@ Line 153: / Line 115: @@
 <tabbox Edge2>
+We will use ''red_led'''' blue_led'' ''green_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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