[GUIDE] Retropie + 3.5 inch RPi LCD v3.0 (no brand)
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I've done all the steps flawlessly, even though the screen is upside down for me, which I got it fixed later on. But now it is SO SLOWWWWW. Adding the lines suggested above into /boot/config.txt won't fix it at all, and even distort the colors. URGENT HELP SINCE I WANT TO COMPLETE MY PORTABLE RETROPIE SETUP!
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I have recently been hacking on writing a new display driver for a WaveShare 3.5" (B) display and some other small Pi TFT displays, and also found out that the ILI9486 controller based WaveShare 3.5" inch screen is indeed quite slow. My copy of the display maxes out at 31.88MHz. I made a video about the best results I could reach at
Other 480x320 Raspberry Pi SPI screens with different controller chips such as HX8357D and MZ61581 are much faster than ILI9486 (at least as present on the WaveShare). A table of SPI speeds of the different displays I have experimented with can be found at https://github.com/juj/fbcp-ili9341#which-spi-display-should-i-buy-to-make-sure-it-works-best-with-fbcp-ili9341 . The smaller 320x240 ILI9341 displays are also much faster, not just because of half the resolution, but also due to a 2.5x faster SPI bandwidth that ILI9341 controllers are able to provide, compared to the ILI9486. As result, ILI9341 are about 5x faster than ILI9486.
Given the differences, for anyone considering the purchase of a 3.5" 480x320 display, I'd recommend those in the order MZ61581 > HX8357D > ILI9486; or if the serial connectivity is not a requirement, then save the trouble and pick up a DPI or HDMI connected display.
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@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?
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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
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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!
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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.
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@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. -
Hello I have only black screen...please help me
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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?
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@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
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Thank you a million!!!
The only thing I modified wassudo cp waveshare-dtoverlays/waveshare35a-overlay.dtb /boot/overlays/waveshare35a.dtboto
sudo cp waveshare-dtoverlays/waveshare35a.dtbo /boot/overlays/waveshare35a.dtbo -
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
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is there a way I can switch between HDMI and LCD screen?
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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
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