Sure. You want to handle 2 video configurations - output to HDMI (which is default) and via the LCD. Save the default config.txt in /boot/ as /boot/config-hdmi.txt. Install and configure the LCD drivers (modify the config.txt) accordingly, make sure it works, then copy the config.txt to /boot/config-waveshare.txt.
Create 2 scripts in /home/pi/RetroPie/retropiemenu
cp -f /boot/config-hdmi.txt /boot/config.txt
cp -f /boot/config-waveshare.txt /boot/config.txt
make the scripts executable by running
chmod +x /home/pi/RetroPie/retropiemenu/hdmi.sh
chmod +x /home/pi/RetroPie/retropiemenu/lcd.sh
Now, when starting EmulationStation, you'll have 2 new entries in the RetroPie system - HDMI and LCD, executing one of them will switch the video output configuration. After running one of the entries, you'll have to reboot to activate the new configuration.
Would be fairly cheap, good quality and the right aspect ratio (or close at least)
I'm a bit hesitant to buy one so I was wondering if there's some that has experience with this one.
Or maybe someone has better option? I want to build a small arcade system.
Thanks for any help
I've not used that particular board and/or screen before, but I have ordered a similar configuration from aliexpress before (although I bought a much lower priced and lower resolution allwinner screen) and their service was absolutely fantastic. despite it taking nearly 2 weeks to arrive I got full tracking and I'd say in that sense it was better than ordering from the UK since you knew exactly where the item was at all times. It was well packaged and I was up and running within minutes of receiving my parcel (although I did have to make some changes to my config file before it would boot, due to the strange resolution I had to set it to). I'm dubious about it saying HD but then saying VGA in the same description. I didn't know ipad screen resolutions were so low and 4:3? But you know all said and done it's gonna be a great quality screen for what you need as most games run at that aspect ratio and for the price you're normally looking at double that for a decent screen, plus you get the driver board too so it should work straight out of the box.