JJBTEXAS
Posts: 3
Joined: Thu May 09, 2013 1:12 am

Force video out through GPIO?

Sat Oct 04, 2014 1:46 am

I'm trying to build a portable emulator using ADAFRUIT's 3.5TFT and I can't get the pi to display on the TFT. I followed ADAFRUIT's guide to no success. I don't really car about having the touch function as emulation station doesn't have support for that anyways. Anything helps!

DirkS
Posts: 10738
Joined: Tue Jun 19, 2012 9:46 pm
Location: Essex, UK

Re: Force video out through GPIO?

Sat Oct 04, 2014 12:17 pm

Which screen is that exactly and which guide did you follow (links please)?

JJBTEXAS
Posts: 3
Joined: Thu May 09, 2013 1:12 am

Re: Force video out through GPIO?

Sun Oct 05, 2014 5:50 pm

I can get the screen running using Adafruit's image and I can get petrock's RetroPie image running fine but when I try to install RetroPie on Adafruit's image, or the opposite, I can't get it to work properly.

screen: http://www.adafruit.com/product/2097

guide: https://learn.adafruit.com/adafruit-pit ... spberry-pi

BMS Doug
Posts: 4423
Joined: Thu Mar 27, 2014 2:42 pm
Location: London, UK

Re: Force video out through GPIO?

Mon Oct 06, 2014 8:47 am

Google has the answers: Retropie will only output by HDMI or composite but there is a workaround:.
I've found this post on the pi forums http://www.raspberrypi.org/forums/viewt ... 67&t=58952 which discusses the same thing. They use this https://github.com/tasanakorn/rpi-fbcp utility to copy the framebuffer. Only issue is it may be slow.
Doug.
Building Management Systems Engineer.

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