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How to turn on Debug LED from "terminal" or Java (Android).

Question asked by Bill Bigelow on Mar 13, 2015
Latest reply on Mar 16, 2015 by igorpadykov

For a quick demo, I need to turn on/off one of the spare LEDs on the 6SLEVM (i.MX6 SoloLite EVK).

I'm demoing an Android app running on that board.

I see how to do it from a C program but not from Java in an Android app.

Sample java blog suggests finding it in the "Device Tree" the write to it like writing a file.

e.g. URI = /sys/devices/virtual/gpio/gpio115/value, or similar location in /sys/classes... or something like that.

Then, to check from the command line, I'd type "echo 1 > /sys/devices/virtual/gpio/gpio115/value"

But I can't find a "device" in the tree that looks like it's for that LED.

On the schematic, it's HSIC_STROBE (and HSIC_STROBE_GPIO).

In reference guide, it mentions GPIO3_20 for ALT5 (a/k/a gpio3.GPIO[20]).  I have no idea how that implies a node in the Device Tree.

In the schematic, it's D23, driven by Q5 (page 14).

Any ideas?