Major issues in recent updates (lvgl 9.3 / DMA code)

[gopro2027]

Unfortunately there are some quite major issues with the more recent revisions of esp32-smartdisplay potentially related to DMA and artifacting on the screen.

At first I was adding a new board, so I worked around it by just tweaking the config until I had minimal artifacting. Unfortunately I still get some. I just assumed it was my code.

It wasn't until tonight that I went to go update our other board (esp32-2432S032C) from lvgl 9.2.2 & an older version of esp32-smartdisplay, that I realized there may be deeper issues with the latest version of esp32-smartdisplay.

I get major artifacting, just as I did on my other device originally.

I went ahead and flashed the demo project (https://github.com/rzeldent/esp32-smartdisplay-demo) and I get the same issue unfortunately. Reverting to lvgl 9.2.2 and the older version of smart display that I have fixes the issue.

I believe there may be some issues with the DMA code in the last release.

[rzeldent]

You could define: SMARTDISPLAY_DMA_CHUNK_THRESHOLD to a large value e.g. SIZE_MAX, effectively disabling DMA.
Does this helps?

[gopro2027]

I believe i have tried disabling DMA in the past and it caused significant issues with framerate, but i will give that a try this evening

UPDATE: I tried changing SMARTDISPLAY_DMA_CHUNK_THRESHOLD from the default 2048 all the way up to 2048 * 128 with no luck

[rzeldent]

This issue contains a link to a a branch without DMA. Is this branch working correctly?

[gopro2027]

This issue contains a link to a a branch without DMA. Is this branch working correctly?

Yes the branch on my fork old-repo https://github.com/gopro2027/esp32-smartdisplay/tree/old-repo works properly.