a while ago I aquired the 4.5" e-paper shield. The example code provided on the website (the epdtest file) does not work - I have connected the shield according to this and I am able to communicate via SPI fine - but I have no idea what to communicate due to the lack of any documentation whatsoever (aside from the schematics file which doesn't really help in this regard. Also let's disregard the countless spelling errors in the tutorial and code.)
When reading out the responses the shield sends back via SPI when I issue a command, most (if not all) of them are in the negative range (-1, -2 etc). Which I suppose means it does not know how to handle the commands the example code sends.
Even sending a simple 3 to it (which should clear the screen according to the tutorial) does nothing.
May I also mention that is it kind of confusing that it just inverts the status pin every time it goes idle instead of having say 0 for idle and 1 for busy? (At least that's what I'm assuming it does.)
I'm using an Arduino Uno and it's built-in SPI. All needed pins are soldered on properly. It does display a default image.
If anyone could help me out I would appreciate it. As it is now, I might aswell have bought an empty picture frame.