[Guide] ili9341 SPI TFT Screen on Retropie

[moosepr]

sorry to post this in here as well as starting a thread but thought it might be best asking the expert @moosepr
do you know if overscan can be adjusted with these spi screens? i have been into the config txt and uncommented all of the # added + and - numbers and get no adjustment on the screen? any tips? thanks

I think the overscan does work, but it is a little weird how it works. I have not really played with it all that much though

[zeppike]

I had these screens around for years now in hope for using them in a gb pocket. With your guide i have a chance now.
Thank you.

[abrugsch]

I had these screens around for years now in hope for using them in a gb pocket. With your guide i have a chance now.
Thank you.

use one with @32Teeth's GB pocket AIO board. they are made for each other (look for Gaboze pocaio)

[32teeth]

use one with @32Teeth's GB pocket AIO board. they are made for each other (look for Gaboze pocaio)

Here's an example of a 2.8" screen, which is too big for the pocket


Have a gander at some of my videos on YouTube



BTW, links are in my signature

[goosewerks]

Got the 2.4" to work without problems, but cannot get this 3.2" to work. It's only giving me a white screen (backlight on, no data).

Screen

Using this board from OSH Park linked in here.

Using the code that's worked before, but I've got nothing. All connections are seemingly correct too:
VCC - VCC
GND - GND
RST - RST
SCL - SCK
D/CX - D/C
CSX - CS
SDI - MISO
SDO - MOSI

Unless I goofed a pin somewhere? Lined the pin1 on the ribbon cable up with pin1 on the board. Seemingly no burned out or ripped out traces either. Kinda bummed it didn't work immediately like the 2.4" did. Ideas? Thoughts?

[rodocop]

Got the 2.4" to work without problems, but cannot get this 3.2" to work. It's only giving me a white screen (backlight on, no data).

Screen

Using this board from OSH Park linked in here.

Using the code that's worked before, but I've got nothing. All connections are seemingly correct too:
VCC - VCC
GND - GND
RST - RST
SCL - SCK
D/CX - D/C
CSX - CS
SDI - MISO
SDO - MOSI

Unless I goofed a pin somewhere? Lined the pin1 on the ribbon cable up with pin1 on the board. Seemingly no burned out or ripped out traces either. Kinda bummed it didn't work immediately like the 2.4" did. Ideas? Thoughts?

Pretty sure SDI goes to MOSI and SDO goes to MISO. Swap those and try.

[moosepr]

yeah match up the I and the O and you should be golden

[goosewerks]

I'll give it a shot when I get home, thanks!

I have another batch of screens coming in today or tomorrow as well, so I can try my luck some more.

[jonbro]

just went on a journey with this guide, and in case anyone else has the same weird setup I do, here is some information:

I am on a PI Model B+ (I don't know if these are still available) - and I could get it running at 30mhz (or 16, or whatever that calculates down to), but anytime I clocked the screen up to 90mhz that other people are reporting is possible, I got a white screen.

Turns out that not all pi's have the same default clock rate, and you need to be running faster to support these screens. Overclocking the Model B+ to be in the realm of a zero got visuals working on the faster clock rates, though it still has a little flicker in the screen from something. I think I am going to order another zero and see if it works better with that.

You can see what all the default clock rates for pis are here.

[goosewerks]

Pretty sure SDI goes to MOSI and SDO goes to MISO. Swap those and try.

yeah match up the I and the O and you should be golden

Works great now, thank you both!