Rockpi4/hardware/led - Revision history

Stephen at 11:18, 6 June 2022

2022-06-06T11:18:08Z

Stephen at 11:16, 6 June 2022

2022-06-06T11:16:16Z

Julien: Add Rock Pi 4 Hardware header

2019-12-09T20:50:13Z

Add Rock Pi 4 Hardware header

Aaditya: create page for LED

2019-12-09T15:03:31Z

create page for LED

New page

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

← Older revision		Revision as of 11:18, 6 June 2022
Line 33:		Line 33:

	# echo mmc1 > /sys/class/leds/user-led2/trigger		# echo mmc1 > /sys/class/leds/user-led2/trigger
		+
		+	To turn LED on:
		+
		+	# echo default-on > /sys/class/leds/user-led2/trigger
		+
		+	To turn LED off:
		+
		+	# echo none > /sys/class/leds/user-led2/trigger

← Older revision		Revision as of 11:16, 6 June 2022
Line 11:		Line 11:

	It is '''''green''''' in color and used to indicate power supply.		It is '''''green''''' in color and used to indicate power supply.
		+
		+	==== ROCK Pi 4C+ ====
		+
		+	# echo 124 > /sys/class/gpio/export
		+	# echo out > /sys/class/gpio/gpio124/direction
		+	# echo 1 > /sys/class/gpio/gpio124/value # Turn LED off
		+	# echo 0 > /sys/class/gpio/gpio124/value # Turn LED on

	=== Status ===		=== Status ===

← Older revision		Revision as of 20:50, 9 December 2019
Line 1:		Line 1:
		+	{{rockpi4_header}}
		+	{{Languages\|rockpi4/hardware/led}}
		+
		+	[[rockpi4 \| ROCK Pi 4]] > [[rockpi4/hardware \| Hardware]] > [[rockpi4/hardware/led \| LED]]
		+
		+	=== Light-emitting diodes (LED) ===
		+
	There are 2 LEDs on the Rock Pi 4.		There are 2 LEDs on the Rock Pi 4.