GP2X [hardware] Buttons On The Gp2x?

[Daid]

Does anyone know how the buttons are done in hardware on the GP2x?

My guess is that they are input lines which are pulled up to VSS with a pullup, and then pulled down when you press a button. Or the other way around, (default low, and pulled up on button press)

I thought it might be cool to add an external joypad to the GP2x that maps to the default GP2x buttons, however, with all the buttons you would need a 15 wire cable. Which is way to thick. Thus I figured I could use a microcontrollers on both sides to send/recv button information. However, for that it would be handy to know how the buttons are done in hardware.

Finaly it should cut the amount of wires down to 3 (VSS, GND, Data) (or four if you want to balance the data in a twisted pair, to reduce noise) and make a nice hobby project.

 

[juanvvc]

Finaly it should cut the amount of wires down to 3 (VSS, GND, Data) (or four if you want to balance the data in a twisted pair, to reduce noise) and make a nice hobby project.

Or you can just build an USB external joypad: 4 wires (VSS, GND, DATA+, DATA-) and supported on many systems apart from Gp2x

 

[Squidge]

I've documented the gpio on the wiki a while ago, check there.

 

[Daid]

Or you can just build an USB external joypad: 4 wires (VSS, GND, DATA+, DATA-) and supported on many systems apart from Gp2x
Now if I wanted a USB input device, then I would have done that, but I want a GP2x buttons compatible device. Will work on all games and all utilities

This is the wiki page you ment Squidge? http://wiki.gp2x.org/wiki/GPIO_Reference
Doh, missed that is said active low. Guess that awnsers my question.