ECE497 Notes on gpio-keys

Timers
Here's some leads on using timers.

kunen.org

gpio-keys
I'm trying to figure out how to access the USER button on the Beagle xM. It looks like the new versions of the SD image use gpio-keys to manage gpio 4 so you can't access it via beagle$ cd /sys/class/gpio beagle$ echo 4 > export bash: echo: write error: Device or resource busy

You need to access it via evtest, but I don't see a way to do it via the shell.