Saving GPIO Input/Output Settings

Angus Ryan

I have a touch screen that only works if I type the following commands into the terminal in the following order:

fast-gpio set-input 15
fast-gpio set-input 16
fast-gpio set-input 17
fast-gpio set-output 15
fast-gpio set-output 16
fast-gpio set-output 17

I think I have to set it as an input first as the docs mention something about how you should prior to setting it as an output and driving voltage to it.

The issue is everytime I unplug my omega or reset it, I have to go back to the terminal and type these commands to make it work, is there a way I can store these settings somewhere so when it boots I don't need to enter it via the terminal?

Thanks

György Farkas

@Angus-Ryan Omega2 Documentation Running a Command on Boot

Put a little script into your home (/root) directory.
cd /root
Run your favorite editor, copy or type this text and save it eg. as 'set_gpios.sh'.

#!/bin/sh

# setting GPIOs to Input
fast-gpio set-input 15
fast-gpio set-input 16
fast-gpio set-input 17
 
# setting GPIOs to Output
fast-gpio set-output 15
fast-gpio set-output 16
fast-gpio set-output 17

chmod +x set_gpios.sh

Edit '/etc/rc.local' - add this command /root/set_gpios.sh before 'exit 0'.

Your script will run automatically on boot and/or you can run it manually: /root/set_gpios.sh.

root@Omega-5BE1:/# cd /root
root@Omega-5BE1:~# nano set_gpios.sh
 ...
root@Omega-5BE1:~# cat set_gpios.sh
#!/bin/sh

# setting GPIOs to Input
fast-gpio set-input 15
fast-gpio set-input 16
fast-gpio set-input 17
 
# setting GPIOs to Output
fast-gpio set-output 15
fast-gpio set-output 16
fast-gpio set-output 17

root@Omega-5BE1:~# chmod +x set_gpios.sh
root@Omega-5BE1:~# ls -l
-rwxr-xr-x    1 root     root           205 Mar 16 16:05 set_gpios.sh

root@Omega-5BE1:~# nano /etc/rc.local
 ...
root@Omega-5BE1:~# cat /etc/rc.local
# Put your custom commands here that should be executed once
# the system init finished. By default this file does nothing.

/root/set_gpios.sh
exit 0

Good luck.

Does your Adafruit shield work really well with these settings?

Angus Ryan

@György-Farkas THANKYOU! Yes it does, I have no idea why, but setting those 3 as inputs then outputs makes it function perfectly.