Raspbian - Indicating ethernet activity using a GPIO attached LED.

[John W. Kitz]

Hi,

I've posted this on a Raspbian email list, but have gotten little response.
So I thought I'd give it a try here.

While I haven't tried any of this, having looked at the documentation
pertaining to the Pi's device tree implementation[1], [2], particularly:

act_led_trigger Choose which activity the LED tracks. Use "heartbeat" for
a nice load indicator. (default "mmc")

act_led_gpio Set which GPIO to use for the activity LED (in case you
want to connect it to an external device)
(default "16" on a non-Plus board, "47" on a Plus or Pi
2) N.B. For Pi3 see pi3-act-led overlay

[1]
https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/overlays/
README
[2]
https://raspberrypi.stackexchange.com/questions/69674/are-there-other-act-le
d-trigger-options-besides-mmc-and-heartbeat

It ought to be possible to configure a Raspberry Pi such that one or more
GPIO attached LEDs light or blink in a way that is indicative of the
activity of certain parts of the hardware of a Raspberry Pi. Examples would
be GPIO attached LEDs flashing on cpu-n usage, flashing on kernel panic,
flashing on SD Card activity, flashing on wifi activity or flashing on
bluetooth activity.

The one thing I'm missing is the ability to have a GPIO attached LED flash
on Ethernet activity.

Where (driver, raspbian, both and/or somewhere else) would a change or
changes have to be made to make this possible?

Is there a place where feature requests, pertaining to changes that are
outside of the scope of a typical user of a Pi, can be made?

If yes, where?

Regards, Jk.

[Christopher Obbard]

Hi John,

The sunxi mailing list probably isn't the best place for this query.

But have a look at:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/leds/leds-class.txt

You can set the trigger property of the LED thru sysfs.


Cheers!

Chris

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