Waveshare 3.5BV2 Question

Hardware
#1

Hello, I recently bought the waveshare 3.5B revision 2 screen to play around with. However, the driver in webconf only shows a black screen. The only one that seems to work is the piscreen v1 but the colors are inverted.

invertedColors
invertedColors1279×565 139 KB

I was able to calibrate it with the tool under the Admin menu and it works pretty well aside from the inverted colors. I seen this was asked before in another topic here but the solution didn’t work for me.

I was curious though and decided to install the driver from the manufacturer to see if the proper colors would show. The machine reboots and I can see the command line with proper colors, but it never gets into the zynthian UI after this. I’m only able to login and get to the terminal.

properColors
properColors1280×819 121 KB

I’m sure this driver install messed with some config files and I probably have to reflash the sd card.

Is there a proper way to install this screen?

#2

I also struggled with this display and did the same as you to no avail. I had to start with a fresh card and copied the official overlay to the boot folder:

so, run a

git clone https://github.com/waveshare/LCD-show.git
cd LCD-show/

and copy the overlay over with

scp waveshare35b-v2-overlay.dtb root@zynthian.local:/boot/overlays/wavesh
are35b-v2-overlay.dtbo

Notice the suffix renaming to .dtbo

Select the display in webconfig and you should be good to go.

Oh, forget to mention: although the display works as it should, touchscreen will be off. Calibration tool didn’t work for me, so I had to manually put in the config. But honestly it is no fun running zynthian with a touch display, so I wouldn’t bother! If you use usb for midi in and audio out there are enough pins free to wire encoders directly to the pi (at least I hope so, had only two around and waiting for the other ones)

But if you insist put

Option "TransformationMatrix" "0 -1 1 1 0 0 0 0 1"

in

/etc/X11/xorg.conf.d/99-calibration.conf

#3

Thank you! This did the trick. I will attempt to use the pins for encoders as well.

#4

as I said this is wip for me also, but this might come in handy:

zynthian_raspi_pinout.xls (19.5 KB)

#5

Thanks again. I’ll be sure to use this.