[GUIDE] Retropie + 3.5 inch RPi LCD v3.0 (no brand)

[jitencraiglist]

@Taft Thanks for this guide..
i was able to get it to work with retropie well.. and dont see a screen lag..
however i see a weird issue..and wondering if anyone can help..
when hdmi cable is plugged / connected to monitor..i see dual display and the games run in correct resolution as in the whole game screen can be seen on the monitor as well as the 3.5 screen..
however if i remove hdmi connection and reboot.. i see lcd screen resolution is fine but when i start a game..that game doesn't fit correctly on the screen. it's resolution is much larger so i can only see partial screen of the game.

any idea how i can fix this issue?

[shredderbenjamin]

Hi, looks like a good guide and people are having good outcomes from your advice but unfortunately for me it's not working! Using a Pi Zero W/retropie 4.4 - in the command "sudo cp waveshare-dtoverlays/waveshare35a-overlay.dtb /boot/overlays/waveshare35a.dtbo" It can't find the resource...

Any advice you could offer a newcomer like me? The screen is lighting up and that's all!

Thanks

[Arzach]

Still works great with 4.5, thanks for the guide! Probably too late for @shredderbenjamin , but the filename isn't correct in that command. it's "waveshare35a.dtbo" not "waveshare35a-overlay.dtb". Once I figured that out it worked like a charm!

[sword_sea]

Hello fellow humans. Ive gotten mine to work, though the colors are a bit wonky. can someone tell me the code for rotating the screen 180 degrees? I would like to use it on it's side for convenience reasons.

[Bio_C]

@sword_sea You should change the string in the /boot/config.txt file
from: dtoverlay=waveshare35a
to: dtoverlay=waveshare35a:rotate=180
Didn't try it myself, but that's what is says in the waveshare readme file.

[dkajan]

Hello I have only black screen...please help me

[SeaFlurry02]

That sudo cp waveshare-dtoverlays/waveshare35a-overlay.dtb /boot/overlays/waveshare35a.dtbo command wont work for me! All i get is the command prompt yelling "cp: missing destination file operand after {former command here}"! Anyone know how to resolve?

[samco]

@SeaFlurry02 just happen to be working on this too. There is a "o" missing in the copy try sudo cp waveshare-dtoverlays/waveshare35a-overlay.dtbo /boot/overlays/waveshare35a.dtbo

[hohodsj]

Thank you a million!!!
The only thing I modified was

sudo cp waveshare-dtoverlays/waveshare35a-overlay.dtb /boot/overlays/waveshare35a.dtbo

to

sudo cp waveshare-dtoverlays/waveshare35a.dtbo /boot/overlays/waveshare35a.dtbo

[slowplayer157]

Hey thank for the code and it works great for a kit i pick up on Ebay, it wasn't that difficult to follow along with, and it's great that i had come across this. This is such great help, and understood what you mean by " this is very important because most guide are for 3.2 inch so if u have the waveshare 3.2 u must exchange the word "waveshare35a " in "waveshare32b" so when you mean if you have a 3.2 inch change "waveshare35a " to "waveshare35b" and if you have a 3.5 inch keep it at waveshare35a

[jtkblue]

is there a way I can switch between HDMI and LCD screen?

[dariofavaron]

Thanks it worked.
The emulator was not centered in the picture so i had to change the resolution under RETROARCH -> Settings -> Video and width and height. it was 12807someting and i put the resolution of the screen 480320