11-08-2015, 14:04
Your mention of SPI communications trouble got my thinking, so I hooked up my scope to the SCK and MISO pins, first at the WD board, then on the display module. Unfortunately, I don't know that well what I'm looking at. I can tell the overshoot is quite a bit greater when plugged into the display module, but beyond that I'm not too sure.
Here are a few as measured on the WD board:
...and measured on the module itself:
Here are a few as measured on the WD board:
...and measured on the module itself: