Using ZynScreen on the clean install Raspberry Pi OS

Hardware
1

Hi,

I’m new here and just got Zynthian V4.2 Kit and enjoyed a bit. I’m now trying not to use the Zynthian OS but use Raspberry Pi OS and enabling ZynScreen.

I just copied /boot/config.txt on the SD card but the screen does not turn on. I tried to use GPIO #18 to turn the backlight on but did not get success.

Does anyone know how to use it without Zynthian OS?

Thanks,
Masanao

2

Hi, welcome.
I hope you know what you are doing …

Anyway,

Zynthian use a custom overlay for zynscreen, see here:

You have to copy the piscreen2r-notouch.dtbo to /boot/overlays/ directory of your SDcard

1 Like
3

Thank you for your help. I copied the file to /boot/overlays and added followings into /boot/cmdline.txt
fbcon=map:10 fbcon=rotate:0 fbcon=font:ProFont6x11

And did gpis -g write 22 1, the backlight turned on but the screen shows white. Are there any extra steps I need to use the ZynScreen v1.5?

When I use Zynthian OS and added the cmdline then it shows console message at boot, but not working for clean installed Raspberry Pi OS.

Thanks,
Masanao

4
5

Zynthian uses some patched versions of various libraries or specific versions. This is why apt upgrade will break a Zynthian. You may find some libraries in a stock distribution do not work.

6

Oh… I see.
Then I will try to run my program on Zynthian OS first.

Note that my synth is build with JUCE and working fine on Raspberry Pi OS + WaveShare 3.5TFT using X11 fullscreen.

Thanks,
Masanao