Difference between revisions of "Rockpi4/hardware/led"
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| + | {{Languages|rockpi4/hardware/led}} | ||
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| + | [[rockpi4 | ROCK Pi 4]] > [[rockpi4/hardware | Hardware]] > [[rockpi4/hardware/led | LED]] | ||
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| + | === Light-emitting diodes (LED) === | ||
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There are 2 LEDs on the Rock Pi 4. | There are 2 LEDs on the Rock Pi 4. | ||
Revision as of 20:50, 9 December 2019
ROCK Pi 4 > Hardware > LED
Light-emitting diodes (LED)
There are 2 LEDs on the Rock Pi 4.
Power
It is green in color and used to indicate power supply.
Status
It is red for Rock Pi 4 v1.3 and blue for Rock Pi 4 v1.4. Shows the status of the device.
For newer kernel, the status LED is configured as heart beat device and usually blinks on/after booting successfully.
Its function can be changed as desired.
$ cat /sys/class/leds/user-led2/trigger none rc-feedback kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock mmc0 mmc1 timer oneshot [heartbeat] backlight gpio cpu0 cpu1 cpu2 cpu3 cpu4 cpu5 default-on rfkill0 mmc2 rfkill1 rfkill2
For example, to set it to show emmc read/write status:
# echo mmc1 > /sys/class/leds/user-led2/trigger