Implement partial refresh for 4.2" module about papertty HOT 10 CLOSED

Display seems to work again... it was in a state where it was constantly "busy" after power on, so I added a generous timeout to wait_until_idle and adjusted VCM_DC_SETTING because the image was randomly more or less washed out. After updating the image a few dozen times (and waiting a couple of days), it now seems to work as it should again.

It sounds like someone else might have had something similar happen with their 7.5" in an unrelated scenario.

Anyway, now that that's out of the way, I can perhaps look at the partial updates at some point, although I'm a bit busy right now.

from papertty.

Relevant files and info

from papertty.

Success! Kind of. Needs some code changes here and there, but the display actually does do partial refreshes. Hopefully with some tweaks it works well enough to be usable, we'll see.

from papertty.

This has been on hold for a while, since I encountered some weird behavior with the display that I'll try to make sense of first before going further. The 4.2" module is fortunately very easy to hook up to a logic analyzer...

from papertty.

Hi!
Did you ever have any luck here?

I’m working on a similar project with the 4.2.

Br

from papertty.

The partial refresh seemed to work, but the code needs some fixes here and there so I haven't had the chance to really test it yet. Support for "proper" rotation is one thing that should be implemented to avoid problems like the code attempting to draw outside the display (which might put it into a weird state). I worked on it a bit but it's currently in a very unfinished state.

I'd like to incorporate the pseudo TTY functionality too at the same time to make the whole thing so much more useful and the code more straightforward, but I simply don't have the time right now to work on this project. 😞

from papertty.

Hi Joukos,
Thanks for your quick reply. No problem - I will let you know if I have any luck :)

Br

from papertty.

Would you be willing to push the code you mention into a wip branch. I would be willing to improve it.

The partial refresh seemed to work, but the code needs some fixes here and there so I haven't had the chance to really test it yet. Support for "proper" rotation is one thing that should be implemented to avoid problems like the code attempting to draw outside the display (which might put it into a weird state). I worked on it a bit but it's currently in a very unfinished state.

I'd like to incorporate the pseudo TTY functionality too at the same time to make the whole thing so much more useful and the code more straightforward, but I simply don't have the time right now to work on this project. 😞

from papertty.

@NullandKale I'll see what I can do. I'd need to dig the source mess a bit first to remember what state I left it in, but I'm not sure yet when I'll have the spare time to do that. AFAIR there wasn't much extra code to get the partial refresh somewhat working.

from papertty.

Now implemented with #40, so closing this.

from papertty.