OK (ACT) LED = led0 Power (PWR) LED = led12. 查詢所有點燈模式
$ cat /sys/class/leds/led0/trigger none mmc0 timer oneshot [heartbeat] backlight gpio cpu0 cpu1 cpu2 cpu3 default-on input3.1. 點亮LED燈
$ sudo sh -c 'echo none > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo none > /sys/class/leds/led1/trigger' $ sudo sh -c 'echo 0 > /sys/class/leds/led0/brightness' $ sudo sh -c 'echo 0 > /sys/class/leds/led1/brightness'點暗LED燈
$ sudo sh -c 'echo none > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo none > /sys/class/leds/led1/trigger' $ sudo sh -c 'echo 1 > /sys/class/leds/led0/brightness' $ sudo sh -c 'echo 1 > /sys/class/leds/led1/brightness'3.2. 以 SD 卡讀寫狀態觸發LED燈
$ sudo sh -c 'echo mmc0 > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo mmc0 > /sys/class/leds/led1/trigger'3.3. 持續閃爍LED燈,delay_on為點亮時間,delay_off為點暗時間
$ sudo sh -c 'echo timer > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo 250 > /sys/class/leds/led0/delay_on' $ sudo sh -c 'echo 250 > /sys/class/leds/led0/delay_off' $ sudo sh -c 'echo timer > /sys/class/leds/led1/trigger' $ sudo sh -c 'echo 2000 > /sys/class/leds/led1/delay_on' $ sudo sh -c 'echo 2000 > /sys/class/leds/led1/delay_off'3.4. 點亮led0,單次觸發後,持續delay_on時間後led熄滅
$ sudo sh -c 'echo oneshot > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo 3000 > /sys/class/leds/led0/delay_on' $ sudo sh -c 'echo 1 > /sys/class/leds/led0/shot'3.5. 心跳閃爍LED燈
$ sudo sh -c 'echo heartbeat > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo heartbeat > /sys/class/leds/led1/trigger'3.6. 以 CPU 狀態觸發LED燈
$ sudo sh -c 'echo cpu0 > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo cpu0 > /sys/class/leds/led1/trigger'3.7. 點亮LED燈
$ sudo sh -c 'echo default-on > /sys/class/leds/led0/trigger' $ sudo sh -c 'echo default-on > /sys/class/leds/led1/trigger'4. Dump GPIO相關資訊
$ mount -t debugfs debugfs /sys/kernel/debug mount: debugfs is already mounted or /sys/kernel/debug busy debugfs is already mounted on /sys/kernel/debug $ cat /sys/kernel/debug/gpio GPIOs 0-53, platform/3f200000.gpio, pinctrl-bcm2835: gpio-35 (? ) out lo gpio-47 (? ) out lo5. 參考來源
https://gist.github.com/taktran/1b691c08216dd30b70bf
以程式控制樹莓派 Raspberry Pi 的 ACT LED 指示燈
Linux PSP GPIO Driver Guide
Raspberry Pi と Raspberry Pi2の非互換性
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