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Linux LED控制编程核心:led sysfs接口详解

  • 2026-02-26 00:55:10
Linux LED控制编程核心:led sysfs接口详解

控制LED设备的两种方式

  • 通过LED在/dev/下的设备节点控制
  • sysfs 文件系统操作LED设备的属性文件控制 (LED设备驱动必须使用LED子系统实现)

sysfs 文件系统

sysfs 是一个基于内存的文件系统,同 devfs、proc 文件系统一样,称为虚拟文件系统,它的作用是将内核信息以文件的方式提供给应用层使用 sysfs 文件系统的主要功能便是对系统设备进行管理,它可以产生一个包含所有系统硬件层次的视图 .... ....

简单概括来说就是内核通过sysfs文件系统将内核对象(例如驱动)的属性通过文件的方式映射到用户空间,用户可以通过这些文件直接操作内核对象的属性进而控制设备。

查看ubuntu主机的led设备:

ls /sys/class/leds/input1::capslock  input1::numlock  input1::scrolllock

查看开发板存在哪些led设备:

ls /sys/class/leds/blue  cpu  green  mmc0::  mmc1::  red
/sys/class/leds下的目录
对应的LED灯设备
input2::capslock
键盘大写锁定指示灯
input2::numlock
键盘数字键盘指示灯
input2::scrolllock
键盘ScrollLock指示灯
cpu
开发板的心跳指示灯
red
开发板RGB灯红色灯
green
开发板RGB灯绿色灯
blue
开发板RGB灯蓝色灯
mmc0::
SD卡指示灯

查看led设备的属性:

ls /sys/class/leds/redbrightness  device  max_brightness  power  subsystem  trigger  uevent
属性
说明
max_brightness
最大亮度值,文件只可读
brightness
亮度值,值范围为[0-max_brightness],不支持亮度等级则0为灭,大于0为亮,文件可读可写
trigger
触发方式

常见触发方式:

触发方式
说明
none
无触发方式
disk-activity
硬盘活动
nand-disk
nand flash活动
mtd
mtd设备活动
timer
定时器
heartbeat
系统心跳

应用程序编写

程序编写即是读写上述属性文件。

对led属性操作

led.h :

#ifndef __LED_H__#define __LED_H__#include"stdint.h"enum {    LED_TRIG_NONE = 0x00,    LED_TRIG_DISK_ACTIVE,    LED_TRIG_NAND_DISK,    LED_TRIG_MTD,    LED_TRIG_TIMER,    LED_TRIG_HEARTBEAT,};typedefuint8_tled_trig_t;int led_set_trigger(char *ledname, led_trig_t trig);int led_set_brightness(char *ledname, int brightness);int led_get_max_brightness(char *ledname);#endif/* __LED_H__ */

led.c:

#include"led.h"#include<stdio.h>#include<stdlib.h>#include<sys/types.h>#include<sys/stat.h>#include<fcntl.h>#include<unistd.h>#include<string.h>#ifndef ARR_COUNTOF#define ARR_COUNTOF(a)   (sizeof(a) / sizeof(a[0]))#endif/* 常见触发方式 */#define TRIGGER_NONE     "none"/* 无触发方式 */#define TRIGGER_DISK_ACTIVITY   "disk-activity"/* 硬盘活动 */#define TRIGGER_NAND_DISK       "nand-disk"/* nand flash活动 */#define TRIGGER_MTD  "mtd"/* mtd设备活动 */#define TRIGGER_TIMER   "timer"/* 定时器 */#define TRIGGER_HEARTBEAT "heartbeat"/* 系统心跳 */int led_set_trigger(char *ledname, led_trig_t trig){int fd;char path[256] = {0};sprintf(path, "/sys/class/leds/%s/trigger", ledname);    fd = open(path, O_RDWR); if (fd < 0return-1;char trigger_style[6][30] = {{TRIGGER_NONE}, {TRIGGER_DISK_ACTIVITY}, {TRIGGER_NAND_DISK},                                 {TRIGGER_MTD}, {TRIGGER_TIMER}, {TRIGGER_HEARTBEAT}};led_trig_t trigger_index[6] = {LED_TRIG_NONE, LED_TRIG_DISK_ACTIVE, LED_TRIG_NAND_DISK,                                    LED_TRIG_MTD, LED_TRIG_TIMER, LED_TRIG_HEARTBEAT};char trigger[20] = {0};for (int i = 0; i < ARR_COUNTOF(trigger_index); i++)     {if (trig == trigger_index[i])        {sprintf(trigger, "%s", trigger_style[i]);break;        }    }int len = strlen(trigger);if (len != write(fd, trigger, len)) return-1;return0;}   int led_set_brightness(char *ledname, int brightness){int fd;char path[256] = {0};sprintf(path, "/sys/class/leds/%s/brightness", ledname);    fd = open(path, O_RDWR); if (fd < 0return-1;char brights[10] = {0};sprintf(brights, "%d", brightness);int len = strlen(brights);if (len != write(fd, brights, len)) return-1;return0;}int led_get_max_brightness(char *ledname){int fd;int max_brightness;char brights[20] = {0};char path[256] = {0};sprintf(path, "/sys/class/leds/%s/max_brightness", ledname);    fd = open(path, O_RDONLY); if (fd < 0return-1;    read(fd, brights, sizeof(brights));    max_brightness = atoi(brights);  /* 将字符串数字转换成整数 */return max_brightness;}

控制led: led_sample.c

#include"stdio.h"#include<sys/types.h>#include<sys/stat.h>#include<fcntl.h>#include<unistd.h>#include<stdio.h>#include<string.h>#include<sys/ioctl.h>#include<poll.h>#include<stdint.h>#include<sys/select.h>#include"led.h"#define RED_LED   "red"#define BLUE_LED  "blue"#define GREEN_LED "green"void sleep_ms(unsignedint ms){structtimevaldelay;    delay.tv_sec = 0;    delay.tv_usec = ms * 1000    select(0NULLNULLNULL, &delay);}int main(int argc, char **argv){    led_set_trigger(RED_LED, LED_TRIG_NONE);int max_brightness = led_get_max_brightness(RED_LED);printf("Max brightness: %d\r\n", max_brightness);int cnt = 0;int  brightness = 0;while (1)    {        led_set_brightness(RED_LED, 0);        sleep_ms(500);        led_set_brightness(RED_LED, 255);        sleep_ms(500);if (++cnt >= 40)break;    }    led_set_brightness(RED_LED, 0);return0;}

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  1. CONNECT:[ UseTime:0.000406s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000539s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000292s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000316s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000539s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000502s ]
  8. SELECT * FROM `article` WHERE `id` = 476645 LIMIT 1 [ RunTime:0.005012s ]
  9. UPDATE `article` SET `lasttime` = 1772253595 WHERE `id` = 476645 [ RunTime:0.000854s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000267s ]
  11. SELECT * FROM `article` WHERE `id` < 476645 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002510s ]
  12. SELECT * FROM `article` WHERE `id` > 476645 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010392s ]
  13. SELECT * FROM `article` WHERE `id` < 476645 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007306s ]
  14. SELECT * FROM `article` WHERE `id` < 476645 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002788s ]
  15. SELECT * FROM `article` WHERE `id` < 476645 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003813s ]
0.107438s