Waveshare "RPI photopainter" not updating display

[depressobbq]

Prerequisites

Please confirm the following:

• [ X] I have searched open and closed issues to make sure it isn't already reported
• [X ] I reviewed the troubleshooting guide
• [ X] I reviewed InkyPi service logs and will paste any relevant logs below

Describe the bug
downloadable WS epd drivers linked in package do not work for a specific model of WS screen, despite being listed as the same model.

Expected behavior
the screen updates when the software tells it to

To Reproduce
Steps to reproduce the behavior:
1 buy/own the "RPI Zero Photopainter" model of the display "https://www.waveshare.com/rpi-zero-photopainter-acce.htm"
2 attempt to install the project using the instructions provided

Additional context
OK with the basic pre-reqs out of the way I can speak a bit more freely.
I set up and installed the package on the RPI zero "photopainter" version of the Waveshare epd screen. its a 7.3in "e" display, and the pi is connected directly to it using the "hat+" standard according to their wiki. so I was surprised to find that even though I had the software working and installed nothing was happening on the screen. so i went over the wiki checked my work and went back to the stable diffusion based setup this thing ships with to make sure the screen was working. finally as a workaround i decided to try replacing the files in src/display/waveshare_epd with the files from the waveshare demo listed with the screen and I included all the other bits in that file that didnt come in src originally, and we have a working display.

if this is a known issue thats already closed, or if the workaround is already posted somewhere and i missed it please disregard and close the issue.
side note, cool project mate!

[fatihak]

Hi and welcome to the project!
The install script downloads the driver and epdconfig.py file from Waveshare's github repo based on the display argument provided.
Looking at the driver for the 7.3in e display in the repository and the photopainter demo, I see this difference in epdconfig.py:

I'm guessing this is likely the cause, as the epd7in3e.py file doesn't have any meaningful differenes (other than a variable name). I don't have the "photopainter" display so I'm unable to test, but if you can confirm this is the case we can add it to the troubleshooting docs or try to figure out a way to handle this during the install.

[depressobbq]

checking over the repo vs the provided files in the demo again I can confirm that the difference is indeed there, I'm also able to confirm the behavior, swapping the pinout back to the repo provided re-creates the "failure" and then pulling all the extras out of the source file but the init / edp7in3e / edpconfig (with fixed pinout) to match your repo, and i still have a working screen. seems its just a bad pinout for that specific version of the product.

[nielsvdp]

I had the same problem with a Waveshare RPi Photopainter and got it working by changing the PWR_PIN definition as it is in the demo config (like in your screenshot @fatihak ).

So it seems the Photopainter is not really the same as epd7in3e from the repo, or the epd7in3e in Waveshare's repo has an error. Not sure what you can do about that in the installer, maybe just put up a note in the Troubleshooting section.

[depressobbq]

I had the same problem with a Waveshare RPi Photopainter and got it working by changing the PWR_PIN definition as it is in the demo config (like in your screenshot @fatihak ).

So it seems the Photopainter is not really the same as epd7in3e from the repo, or the epd7in3e in Waveshare's repo has an error. Not sure what you can do about that in the installer, maybe just put up a note in the Troubleshooting section.

Im fairly sure that waveshare intends it to be a different model just using the same parts, because they have separate listings for it on their site. you can buy an esp version of the same display, and id bet the definitions work for that one.

[333337lee]

changing power pin from 18 to 27 also worked for me thanks.

in addition I changed: sudo bash install/install.sh -W epd7in3f
to: sudo bash install/install.sh -W epd7in3e

Not sure if it was an error on the Installation page or just different for my model Waveshare RPI Zero photopainter. I also used the inverted settings in InkyPi to rotate my display 180 so it matched the stand.