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products:sbc:common:applications:gpio:led

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products:sbc:common:applications:gpio:led [2022/07/12 05:02]
nick 		products:sbc:common:applications:gpio:led [2023/11/07 03:23] (current)
nick
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 +~~tag>LED linux~~
 ====== LED ====== ====== LED ======
  
 ===== Introduction ===== ===== 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. 
  
-This document mainly describes the onboard LEDs. You will learn how 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. 
- 
-<code shell> 
-$ ls /sys/class/leds 
-sys_led 
-</code> 
- 
-<tabbox VIM3/3L> 
- 
-VIM3/VIM3L has two nodes. 
- 
-<code shell> 
-ls /sys/class/leds 
-red_led  sys_led 
-</code> 
- 
-<tabbox VIM4> 
- 
-VIM4 has only one node which is a PWM LED. 
- 
-<code shell> 
-$ ls /sys/class/leds 
-pwmled 
-</code> 
-<tabbox Edge1> 
- 
-Edge1 has two nodes. 
- 
-```shell 
-$ ls /sys/class/leds 
-read_led  sys_led 
-``` 
-<tabbox Edge2> 
- 
-</tabbox> 
  
 ===== Setup LED ===== ===== Setup LED =====
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 Set the LED node parameter to ''none'' to turn off the LED: Set the LED node parameter to ''none'' to turn off the LED:
  
-<code shell>+```shell
 $ echo none | sudo tee /sys/class/leds/sys_led/trigger $ echo none | sudo tee /sys/class/leds/sys_led/trigger
-</code>+```
  
 **Turn on** **Turn on**
Line 63: Line 40:
 Set the LED node parameter to ''default-on'' to keep the LED permanently on: Set the LED node parameter to ''default-on'' to keep the LED permanently on:
  
-<code shell>+```shell
 $ echo default-on | sudo tee /sys/class/leds/sys_led/trigger $ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
-</code>+```
  
 **Set LED heartbeat** **Set LED heartbeat**
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 Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink: Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:
  
-<code shell> +```shell 
-$ echo heartbeat > /sys/class/leds/sys_led/trigger +$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger 
-</code>+```
  
-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. We will take ''pwmled'' (white) as an example.
Line 85: Line 62:
 Set the LED node parameter to ''none'' to turn off the LED: Set the LED node parameter to ''none'' to turn off the LED:
  
-<code shell>+```shell
 $ echo none | sudo tee /sys/class/leds/pwmled/trigger $ echo none | sudo tee /sys/class/leds/pwmled/trigger
-</code>+```
  
 **Turn on** **Turn on**
  
-Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat rhythm:+Set the LED node parameter to ''default-on'', to make the LED permanently on:
  
-<code shell> +```shell 
-$ echo heartbeat | sudo tee /sys/class/leds/pwmled/trigger +$ echo default-on | sudo tee /sys/class/leds/pwmled/trigger 
-</code>+```
  
  
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 Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink: Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:
  
-<code shell> +```shell 
-$ echo heartbeat > /sys/class/leds/pwmled/trigger +$ echo heartbeat | sudo tee /sys/class/leds/pwmled/trigger 
-</code>+```
  
 You can also experiment with other parameters. You can also experiment with other parameters.
Line 110: Line 87:
 <tabbox Edge1> <tabbox Edge1>
  
-We will use sys_led as an example:+We will use ''sys_led'' as an example: 
 + 
 +**Turn off**
  
-  * Turn off 
 Set the LED node parameter to ''none'' to turn off the LED: Set the LED node parameter to ''none'' to turn off the LED:
  
Line 119: Line 97:
 ``` ```
  
-  * Turn on+**Turn on** 
 Set the LED node parameter to ''default-on'' to keep the LED permanently on: Set the LED node parameter to ''default-on'' to keep the LED permanently on:
  
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 $ echo default-on | sudo tee /sys/class/leds/sys_led/trigger $ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
 ``` ```
-  * Set LED heartbeat+**Set LED heartbeat** 
 Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink: Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:
  
 ```shell ```shell
-$ echo heartbeat > /sys/class/leds/sys_led/trigger+$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger
 ``` ```
  
Line 135: Line 115:
  
 <tabbox Edge2> <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> </tabbox>
Last modified: 2022/07/12 05:02 by nick

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