TFT & Compute Module

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technicus
 
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Joined: Fri Feb 28, 2014 9:50 pm

TFT & Compute Module

Post by technicus »

Hello,

I've got a Raspberry Pi Compute development board, and I connected an Adafruit 2.8 TFT. First I installed Cupcade:< http://adafruit-download.s3.amazonaws.c ... 14.img.zip > on to a Raspberry Pi modle B and connected the screen and buttons to GPIO. I installed a few roms and checked it out to see if it works. It worked just fine. Then I cloned the image from the SD card in the model B to the eMMC of the compute module.

Then I connected the TFT screen like so:

TFT Compute
============================
GND JP5Pin2
5v JP5Pin4
CE1 JP5Pin7
CE0 JP5Pin8
MISO JP5Pin9
MOSISCLK JP5Pin10
GPIO18 JP5Pin18
GPIO24 JP5Pin24
GPIO25 JP5Pin25

Then attempted to boot, but there is no output. The screen lights up but does not go black and display text.

Is it possible that the Compute Module requires a different kernel patch?
Do the pin connections I described look accurate?
What else can I do to try and get this working?

Thanks :)

References:
< http://pi4j.com/pins/model-cm-rev1.html >
< http://hypfer.de/blog/2014/03/22/sprach ... pberry-pi/ >

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adafruit_support_rick
 
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Joined: Tue Mar 15, 2011 11:42 am

Re: TFT & Compute Module

Post by adafruit_support_rick »

We don't support the compute module here. Sorry.
Technicus wrote:MOSISCLK JP5Pin10
That doesn't look right. MOSI and SCLK are two different signals.

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technicus
 
Posts: 12
Joined: Fri Feb 28, 2014 9:50 pm

Re: TFT & Compute Module

Post by technicus »

Ok so I rewired the TFT to the Compute development board header, and it works. My goal is to run MAME. I installed the cupcade software: < http://adafruit-download.s3.amazonaws.c ... 14.img.zip > in the compute but it did not work. So I have decided to install a stock Raspbian, and install MAME: < https://code.google.com/p/mame4all-pi/ > and/or Gamera: < https://github.com/adafruit/Adafruit-Retrogame >.

I was able to install MAME following: < https://learn.adafruit.com/retro-gaming ... #emulators >. I am not sure how to install Gamera or how to get MAME to output to the TFT.

Will someone please share some insite?

Thanks :)

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technicus
 
Posts: 12
Joined: Fri Feb 28, 2014 9:50 pm

Re: TFT & Compute Module

Post by technicus »

Hey, I am charting new territroity. The Cupcade image does not work with the Compute module. So I installed Raspbian then installed AdvanceMame and Retrogame-gamera. But it is very messy and is extreamly slow. I need to either turn off services, which I am trying to figure out, but having minimul success or change some configuration files.

It doesn't make sense that the roms are in boot on the compute, but that is the only way I could get it to work. I don't understand everything that gamera retrogame and advancemame are doing, but it does work. If there is anyone who could give me some pointers on what I should modify to get it working better please share with me.

Maybe if I can get it going I could make it into a new Cupcade image for the Compute module.

Thanks

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pburgess
 
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Joined: Sun Oct 26, 2008 2:29 am

Re: TFT & Compute Module

Post by pburgess »

Unfortunately I don't have a Compute Module board & breakout here to test against. Are you using the DMA-enabled version of the PiTFT driver?

To be honest, it's a pretty esoteric combination and I don't see this becoming a priority, especially with the imminent release of the Model A+; that'll probably become the go-to board for small embedded PiTFT projects. Bigger than the Compute Module, yeah, but mates directly with the display.

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