waveshareteam
2in9 showing only odd mosaic, not responding for example code
Hi team.
After sucessful connection to RP Zero, I've tried to test the screen with epd_2in9_test.py - but the screen shown nothing, and with epd_2in9_V2_test.py I've only got this - https://i.ibb.co/Nn8DnSX/IMG-20210815-225054.jpg.
Next tries did not change to what is being displayed on screen.
Any ideas what is the issue?
Hi @unster,
I tested it with RPi Zero and it worked. I suggest you contact our after-sales staff for a better analysis.
I had the same issue with my 4.2" display at the beginning. I then had realized that I had forgotten to initialize the DC pin properly on my 32bit MCU and after configuring the DC pin to PushPull mode the display worked perfectly. But I am not sure if this is the case on your RP Zero as well.
@unster I am having a similar issue with the 2.13 inch. It just shows a static like pattern and doesn't respond to the example code. I'm also using a RPi ZeroW. Have you found a fix yet?
a note for the python code: I was using RPi 4b and had the same issue - turns out epdconfig.py uses RPi.GPIO.setmode(RPi.GPIO.BCM) instead of RPi.GPIO.BOARD. Since there are differences between difference version of raspberry BCM pins and board pins, that caused the mosaic for me. I just redefined the pins to boardpins and updated the module_init to use self.GPIO.setmode(self.GPIO.BOARD) and everything worked
