[Guide] ili9341 SPI TFT Screen on Retropie

[Mikethesith200]

So the 9 pin display will work with this guide?

Here is 2.2 inch display I bought.
http://m.ebay.com/itm/191816725599

[tonda2]

Yes

[moosepr]

So the 9 pin display will work with this guide?

Here is 2.2 inch display I bought.
http://m.ebay.com/itm/191816725599

ah, i missed that 9 pin bit!! As long as its an ILI9341 screen, your golden!

[Mikethesith200]

Sorry for the noob questions, but thanks so much for replying.

So the 9 pin display will work with this guide?

Here is 2.2 inch display I bought.
http://m.ebay.com/itm/191816725599

ah, i missed that 9 pin bit!! As long as its an ILI9341 screen, your golden!

[Holydohnut]

Hi all. I ordered myself an ili9341 from a seller in China about 10 days ago, and I was gobsmacked to find out it's arrived today! (Beating the usb sound card and speakers I ordered nearly a month ago! But I should have known that something would go wrong. I noticed immediately that the screen seemed to have extra pins down the side, and after a bit of investigating, I think they've sent me a ILI9225 instead.

I've read that this screen has a poor resolution compared to the ili9341, but as I can't face the returns process, is there a way to get this screen working for now? The pins don't match what's at the beginning of the guide, though I have read that the driver on Github *should* work.

Here's the pinouts on the screen. If someone could guide me in the right direction, I'd be appreciative.

1501599483182-1731392882.jpg (3.69 MiB) Viewed 7090 times

[moosepr]

Give it a go as ili9341, it might work, most use the same instructions. The pins ain't that far off


Display--------Raspberry Pi
LED/BL--------------pin 12 (GPIO 18)
CLK/SCK------------pin 23 (GPIO 11)
MISO----------pin 21 (GPIO 9)
SDI/MOSI----------pin 19 (GPIO 10)
CS--------------pin 24 (GPIO 8)
RST------------pin 22 (GPIO 25)
RS/D/C-------------pin 18 (GPIO 24)
VIN-------------pin 17 (3.3v)
GND-----------pin 20 (GND)

[Holydohnut]

Thank you! I'll give it a go as soon as the kids are in bed!

[Holydohnut]

Just got to give this a try. Connected up all the wires on a breadboard so I'm pretty sure the connections are good. Ran the first command and the screen lit up as described. But when I ran the con2fbmap 1 1 command, nothing happened.

For the MISO pin, the screen only has one of those on the opposite side of the board, and it's labeled SD-MISO. Is that the right one to connect to pi pin 21?

Thanks!

[moosepr]

You don't need to worry about the pins on the other side, they are for the SD card. The screen is one way communication, so you only need the SDI/MOSI.

Does the normal console stop responding like us on the other screen?

[Holydohnut]

Thanks. I thought that might be the case so I removed it while I was testing last night. I spent a good few hours tinkering, but just can't get it to work. Reading through the Github pages I realised that if you specify the ili9341 card, dmesg displays a final line that amongst other things, contains a resolution higher than this screen can manage. It does say you can specify the ILI9225, but when I tried that, the backlight doesn't even come on, and the final graphics line is missing from dmesg. Looking through the config, I found another driver with the correct resolution (bn8430 or something) so I tried that as well, and that does activate the backlight, and while the screen doesn't come on with the con2.... Command, the hdmi screen. DOES stop responding until you use the 1 0 command.

I feel like I'm really close and yet still so far away! I might try a full system update today to make sure all the packages are the latest version. If you do have any other suggestions though, I'd be very grateful!