[V9.1] No STM32 DMA2D Support

[hussamaldean]

Hi all,
I’ve noticed when I wanted to port LvGL V9.1 to my STM32H757, I’ve noticed there is no support for DMA2D in lv_config at all.
Is it possible to bring back this feature?
I’ve noticed performance reduction compared to V8.4.
Adding support for this feature might solve the issue.

Regards.

[kdschlosser]

Here is the reason as to why.

Enabling/Disabling DMA2D doesn't have any impact on the performance

Hi, I made many measurements when implemented the DMA2D support and I found that usually it’s really not faster then LVGL’s software rendering. DMA2D supports very simple opearations: fill an area copy an area blend two areas with opacity and color format conversations during this operations but we don’t use it For fill area and copy area apparently DMA2D can not work faster than a well-written memset or memcpy. For blending DMA2D could be faster but SW rendering is very well optimized her…

[kisvegabor]

In v9 we add built-in GPU support only for your partners. We are working on setting up our partnership with ST and I hope we can added it back soon.

I’m sorry for this issue.

[hussamaldean]

In other word, you are looking for support of Vector Graphic GPU (NeoChromVG), right?

[kisvegabor]

Yes, it’s planned too. But we still need some time to get there.

[Malte]

Think Silicon, the creator of the Nema GPU, which is what ST uses as NeoChrom and NeoChromVG, made a port of lvgl 8.3 to the Nema/NeoChrom GPU, without vector support

GitHub - Think-Silicon/lvgl at release/LVGL_over_NemaGFX_v8.3

The Nema API that is shipped with the ToughGFX desiger is currently missing one functionality to use this port.

[kisvegabor]

Very nice! Thank you opening the Pull Request! Can wait to try it out with v9!

@Malte

The Nema API that is shipped with the ToughGFX desiger is currently missing one functionality to use this port.

LVGL is not compatible with TouchGFX, I think it won’t be an issue.