Again I'm annoyed that their documentation is so out of date.
"dtoverlay=pitft28-resistive" should work with the standard kernel to load the relevant kernel drivers. No need for any userspace shenanigans.
If the touch is inverted, then you can add overrides of "touch-invx", "touch-invy", and "touch-swapxy" to get the kernel to swap the touch co-ords around.
Use evtest to check for events being received in a timely manner.
There was an issue with the Piscreen overlay where it had the polarity of the "pen down" GPIO/interrupt inverted, so it polled the position when not touched, and stopped when touched. This is a different controller so may not have the same issue, but evtest should tell you fairly quickly.
The 3.5" panel has the same touch controller, and I think I have one of those, so I may give it a quick test.
Edit: Tested. 3.5" works fine with evtest.
"dtoverlay=pitft28-resistive" should work with the standard kernel to load the relevant kernel drivers. No need for any userspace shenanigans.
If the touch is inverted, then you can add overrides of "touch-invx", "touch-invy", and "touch-swapxy" to get the kernel to swap the touch co-ords around.
Use evtest to check for events being received in a timely manner.
There was an issue with the Piscreen overlay where it had the polarity of the "pen down" GPIO/interrupt inverted, so it polled the position when not touched, and stopped when touched. This is a different controller so may not have the same issue, but evtest should tell you fairly quickly.
The 3.5" panel has the same touch controller, and I think I have one of those, so I may give it a quick test.
Edit: Tested. 3.5" works fine with evtest.
Statistics: Posted by 6by9 — Thu Apr 03, 2025 3:30 pm