I had one RAMPS discount full graphics controller laying around from my RigidBot. I did use it with the original controller and decided to test it with the PrntrBoard.
In Rev1 and Rev2 of the board I did not have enough pins on the LCD connector to be able to use all buttons on the panel. In the Rev3 I used every last pin of the tiny 64-pin package and I just got enough (or so I thought).
I learned the SPI used by the LCD panel is not very standard and had to fight with Marlin to make the TMC drivers and the LCD co-exist on the same SPI bus.
Finally I was able to use the panel:
One of the pins I used for the button input did not quite cooperate, so I have only one button + the rotary controller for the UI. Lucky for me both Marlin and Smoothieware were functioning with that configuration.
I had to disable the TMC diver monitoring, because the LCD controller was getting confused by the SPI communication with the TMC drivers. I think I can create a small breakout board with a few AND gates to alleviate this interference.
Here is a video of the panel working in Smoothieware:
