Pi in a Dreamcast VMU Build - WIP

[moosepr]

@obsidianspider they seem to work ok just soldered to wires. they are encased so they can work on there own. the one im testing is just on wires, and resting on the board

[obsidianspider]

I just got the mail, and wow, when @celly said he would include "some other goodies" in with the VMUs he was sending, he wasn't kidding. Thank you again @celly!

[moosepr]

WOW!!

[celly]

@obsidianspider yes! Glad you got it all. Can't wait to see the finished product.

[ABrugsch]

are those actual Garbage Pail Kids? wow memories!
(or do they still make them?) one of the things that annoyed me moving from USA to UK as a kid was that the garbage pail kids got smaller, and went from having a cutout shape for the sticker part to just being fully rectangular. I think I ended up throwing my collection away, or just sticking them to things...

[obsidianspider]

@ABrugsch They're Garbage Pail Kids!

[obsidianspider]

My screens showed up in the mail today!

No protective stickers over the actual display itself, so hopefully the minor imperfections I'm seeing on both screens are just some dirt.

A quick mockup of setting a screen inside a VMU looks very promising.

[moosepr]

@obsidianspider chip at the top sure it better!! plus the driver being upside down to begin with, means not having to worry about changing it!

[obsidianspider]

@moosepr Now I'm trying to figure out what GPIO pins map to the pins on the red board.

[moosepr]

@obsidianspider is this any use?

[obsidianspider]

@moosepr This is about where I'm at. Your diagram helps quite a bit. I'll have to see if I can follow the traces and translate that to the pins on the red board before I try soldering things up. I want to make sure things work stock before I take it apart.

[moosepr]

@obsidianspider lets see if i can fill in the blanks for you
1 - 3.3v
2 - gnd
3 - gpio 8 (pin 24)
4 - gpio 25 (pin 22)
5 - gpio 24 (pin 18)
6 - gpio 10 (pin 19)
7 - gpio 11 (pin 23)
8 - 3.3v (can be the same as pin 1)

my schematic is a little messy, lots of crossovers. tis something i need to refine

[obsidianspider]

@moosepr Well, it looks like I came up with the same answer, so that's good. Now I need to tweak a RetroPie setup to see if I can get things working!

[moosepr]

@obsidianspider thats the easy bit

raspi-config - enable spi

sudo nano /etc/modules - add in

spi-bcm2835
fbtft_device

sudo nano /etc/modprobe.d/fbtft.conf - add in

options fbtft_device name=fb_ili9163 gpios=reset:25,dc:24 speed=40000000 bgr=1 rotate=0 custom=1 fps=60

reboot

[obsidianspider]

@moosepr I'm workin on it! I'm workin on it!

[obsidianspider]

So, it works, kind of. Both screens are showing garbage data on the pixels on the right, one is showing them on the bottom as well. I haven't tried adjusting resolution yet, but the screen is mirroring what's going to HDMI correctly, aside from the garbage pixels.

I do have overscan disabled in /boot/config.txt

[lilbud]

@obsidianspider do the dead pixels show up under the VMU bezel?

[moosepr]

@obsidianspider hmmm are those the 128x128 screens, or the 128x160?

[obsidianspider]

@moosepr they're the "red board" screens.

Setting the HDMI resolution to 128 x 128 in /boot/config.txt didn't help.

Great refresh rate though. Very smooth.

@lilbud The whole screen shows. I'm going to actually end up coloring in the white surround black to hide it a bit. This is just "set in" but you get the idea.

[moosepr]

@obsidianspider just for shits and giggles, try running it with the other driver

options fbtft_device name=fb_st7735r gpios=reset:25,dc:24 speed=40000000 bgr=1 rotate=0 custom=1 fps=60

then if that works, try adding some size in there

options fbtft_device name=fb_st7735r gpios=reset:25,dc:24 speed=40000000 height=128 bgr=1 rotate=0 custom=1 fps=60

all in sudo nano /etc/modprobe.d/fbtft.conf of course