STM32H7S7 LVGL Port?

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1

I’ve purchased an STM32H7S78-DK development board from ST which has the ChromeArt GPU on board
Is there a port of LVGL v9 that works on the H7?

Would love to test it out and see if it works, and how it works

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STM32H7S7L8H6H is equipped with NeoChrom (GPU2D), Chrom-ART (DMA2D) and Chrom-GRC (GFXMMU). DAM2D support in v9 is not as complete yet as it was in 8.3 but it exists and offers noticeable acceleration. I think GFXMMU support has just been added but I have not checked it out myself yet.
@liamHowatt, would you care to comment?

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Yes thanks for clarifying.
I meant to point out the NeoChrom GPU support, not the ChromArt that most of the F and H chips already support

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Hi, here is the port for that board:

The DMA2D support in LVGL was actually developed on this board so it’s ready to use LVGL’s DMA2D rendering. I just realized the port wasn’t updated to include LVGL’s DMA2D renderer after it got merged.

I just opened a PR (may be already merged depending on when you see this) which enables DMA2D rendering by default for that board. The average score on the benchmark with DMA2D is 18% CPU, 27 FPS, 3ms render time VS without 19% CPU, 27 FPS, 4ms render time. That’s the average of all the benchmark scenes. The DMA2D renderer only speeds up a couple types of draw tasks: fills and images.
Here’s the PR:

You can use DMA2D before the PR gets merged. Just upgrade the submodule and set LV_USE_DRAW_DMA2D to 1 in lv_conf.h.

Regarding NeoChrom, here’s a nearly-ready PR (again, may be already merged depending on when you see this) for a STM32U5 board which uses the new NeoChrom GPU renderer in LVGL (different than DMA2D aka ChromArt) here:

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Since this is for the STM32U5 - this won’t compile with the U5 hal files included in the project on the H7 board, will it?

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The STM32H7 MCUs don’t have the NeoChrom/NemaGFX GPU from what I understand.

H7:

  • ChromArt/DMA2D

U5:

  • ChromArt/DMA2D
  • NeoChrom/NemaGFX

Have I got that right?

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You are correct that the H7 line in general does not have it, but the H7RS (STM32H7R7/7S7) does have the NeoChrom GPU built in.

I have a the dev kit with the TouchGFX demo that uses the GPU

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Oh wow, thanks for the tip. The amount of work to get it working should be small even though we don’t have a port repo for it. Sorry for sending a link to a similar but clearly different H7 port.

FYI here are the docs for LVGL’s NeoChrom support: NemaGFX Acceleration (AKA NeoChrom) — LVGL documentation

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