Can't get GPIO working rpi2

Add-ons Bindings
1

So I think I’ve done everything correctly, but I’m at a loss.
When openhab starts up and loads my items file it says:

2016-03-04 04:47:40.905 [INFO ] [runtime.busevents ] - Motion1 state updated to OPEN
Exception in thread “openHAB GPIO event listener (pin 7)” java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native
at org.openhab.io.gpio.linux.LibC.(LibC.java:54)
at org.openhab.io.gpio.linux.GPIOPinLinux$EventListener.run(GPIOPinLinux.java:652)

I copied the addons:
org.openhab.io.gpio
org.openhab.binding.gpio

i added this to start.sh:
Djna.boot.library.path=/usr/lib/jni

I have this in openhab.cfg:
gpio:sysfs=/sys
gpio:debounce=10

I have this in my item configuration:
Contact Motion1 “LR Motion” (Internal){ gpio=“pin:7 activelow:yes” }

in the instructions on the wiki it says to install native jna 3.2.7, but there doesn’t seem to be any instruction for this, does anyone know what I’m missing here?

2

I looked at the logs a bit more and noticed this:
2016-03-04 05:24:36.053 [ERROR] [.o.b.gpio.internal.GPIOBinding] - Error occured while creating backend object for item Motion1, exception: Device or resource busy

3

Put this somewhere near the top of your start.sh script ::

echo 7 > /sys/class/gpio/unexport

Not 100% sure, but i think this will fix your issue.

regards
Espen

4

Thanks, but This didn’t work for me, any other ideas?

5

Check user permissions, either run openhab as root or add openhab to the gpio group. If using Jessie you should probably also checkout this thread: https://community.openhab.org/t/raspian-jessie-gpio-input

6

thanks it worked for me

7

you can even add force:yes in the item defination