Solved 3:2 Aspect Ratio?

[Substring]

@BuToNz have you looked at hdmi_cvt inconfig.txt ? The ratio doesn't matter at all, but your screen does. See https://www.raspberrypi.org/documentation/configuration/config-txt.md

Is your screen on SPI ? HDMI or DPI ? Or even composite ?

[BuToNz]

@Substring Thanks! I did look at that but seems you have to define a ratio? There is no 3:2. The screen is HDMI

Changing the RetroArch config to 3:2 ratio the games look fine, just struggling with the UI looking right now. I wouldn't mind black bars at the top and the bottom but the 'tall' stretch is bugging me!

[Substring]

@BuToNz you're taking the problem in the wrong order i believe ... If your screen was set to 480x320 right from the start and you tell recalbox not to change the resolution when launching an emulator, i think you'd be good.

https://github.com/recalbox/recalbox-os/wiki/Video-configuration-detailled-(EN) wouldn't hurt to read

[BuToNz]

@Substring It's not the emulators that are a problem now it's the UI. I have read through the video config but don't see a way to force my resolution? None of the HDMI modes or the CVT mode has the right resolution/aspect ratio options? Perhaps I am understanding it wrong...

This is the display I am using: https://www.aliexpress.com/item/Newest-3-5-LCD-USB-Touch-Screen-Display-HDMI-1920x1080-LCD-Display-Audio-for-Raspberry-Pi/32770598031.html

[Substring]

@BuToNz So just set a hdmi_cvt yourself in the config.txt (see my 1st link), switch to hdmi_group=2 and hdmi_mode=87 in /boot/config.txt, and global.videomode=default in recalbox.conf

[BuToNz]

@Substring I understand but in custom CVT I need to define an aspect ratio?
aspect ratio 1=4:3, 2=14:9, 3=16:9, 4=5:4, 5=16:10, 6=15:9 are the only options, no 3:2?

[Substring]

@BuToNz then hdmi_timings rather maybe
The doc says you're 1080p, why not run at such res ?

[BuToNz]

@Substring Thanks for the help! I created a custom mode without the aspect ratio, seems to have done the trick! Font looks horrible but I could probably modify the theme for larger font to fix that.

So my config.txt has this:
hdmi_cvt=480 320 60
hdmi_group=2
hdmi_mode=87
hdmi_drive=2

It will take a 1080p/720p signal but it looks 'tall' hence trying to set a custom resolution/aspect ratio.

[Substring]

@BuToNz great !

[ian57]

@BuToNz did you check this page https://github.com/recalbox/recalbox-os/wiki/TFT-Screen-SPI-Bus-(EN) and the section on the 3.5 waveshare tft screen :

#tft screen
#Waveshare 3.5 TFT Screen
#same resolution for hdmi and tft
hdmi_force_hotplug=1
hdmi_cvt=480 320 60 1 0 0 0
hdmi_group=2
hdmi_mode=1
hdmi_mode=87

dtparam=spi=on
dtoverlay=waveshare35a:rotate=270,speed=27000000