LED status

[MoonKid]

What does the two (blue & red) LED on the board indicate?

Is there a code list somewhere about blinking frequences for error codes etc?

[mad_ady]

Red led on - means there is power at the barrel jack.
Red led off - means there is no power (or wrong voltage) at the power jack
Blue led on (immediatelly after boot)- Board is running u-boot
Blue led flashing - kernel is running (heartbeat)

You can change blue led function after boot.

[MoonKid]

Where is the official documentation about it?

I still try to learn how the information flow is in the odroid world. I don't want to ask such simple questions on the board. I want to find the answers myself.

[mad_ady]

Over here: https://wiki.odroid.com/odroid-c4/appli ... ed_control

[odroid]

The ODROID-HC4 is our first product which can control the red power LED by software.
https://wiki.odroid.com/odroid-hc4/appl ... ed_control

[mad_ady]

Neat! I didn't know that.

[MoonKid]

Over here: https://wiki.odroid.com/odroid-c4/appli ... ed_control

That page tells me how to modify the led behaviour. But did not explain the default behaviour.

The information is still missing.

[tobetter]

Over here: https://wiki.odroid.com/odroid-c4/appli ... ed_control

That page tells me how to modify the led behaviour. But did not explain the default behaviour.

The information is still missing.

The default LED status is as @mad_ady has exaplained. The RED LED is not controllerable since it just lits when power is supplied, while the BLUE LED is lit when the boot loader is started and start to blink when the OS is started. But the blue LED can be controlled by software - U-boot and kernel, it will would not be same with all OS images. Just most OS image behaves same.

[odroid]

Over here: https://wiki.odroid.com/odroid-c4/appli ... ed_control

That page tells me how to modify the led behaviour. But did not explain the default behaviour.

The information is still missing.

The default behaviors could be found in the HC4 hardware specification.
https://wiki.odroid.com/odroid-hc4/hard ... ifications

[MoonKid]

The default behaviors could be found in the HC4 hardware specification.
https://wiki.odroid.com/odroid-hc4/hard ... ifications

Still incomplete.

What does it mean if red and blue are not permanantly on (not blinking)?

[j.fikar]

The ODROID-HC4 is our first product which can control the red power LED by software.
https://wiki.odroid.com/odroid-hc4/appl ... ed_control

There is a mistake in the first command

Code: Select all

# Export GPIO
root@odroid:~# echo 503 > /sys/class/export

should be

Code: Select all

# Export GPIO
root@odroid:~# echo 503 > /sys/class/gpio/export

[odroid]

@j.fikar,
Thank you for the correction.
We've updated the wiki page.

[rpardini]

Hi, I've the HC4, running @tobetter's Ubuntu Focal (netboot_default install), with Kernel 5.10.0-odroid-arm64 and DTB dtbs/5.10.0-odroid-arm64/amlogic/meson64_odroidhc4.dtb
Blue LED control works perfectly, but the path is slightly different from the docs, /sys/class/leds/blue:status/trigger (escaped form is /sys/class/leds/blue\:status/trigger).
Red LED, via GPIO, does not work, 503 is exported, but does nothing.
Any ideas?
Thanks

[odroid]

The wiki document was written with the stock old kernel 4.9.
Upstream kernel has some different behaviors.

[rpardini]

The wiki document was written with the stock old kernel 4.9.
Upstream kernel has some different behaviors.

Very nice, I just sent @tobetter a Pull Request #21 adding the red/power led to the DTS/DTB for the HC4 on the 5.10.y series.

Code: Select all

leds {
        compatible = "gpio-leds";
        led-red {
                color = <LED_COLOR_ID_RED>;
                function = LED_FUNCTION_POWER;
                gpios = <&gpio_ao GPIOAO_7 GPIO_ACTIVE_HIGH>;
                linux,default-trigger = "default-on";
        };
};