Touch GFX on STM32F469 or STMF769 Boards with Resolution 1280x720

[KGlei.1]

Hi at all,

we want to use Touch GFX for our display project. Actually we use a display with rgb interface.

Now i have seen, that the newer STM32 boards with F469 and F769 are using a DSI (MIPI) interface to the display and it is always the 4" 800x480 mounted.

Touch GFX supports these boards with demo projects. Now i want to know:

1) We want to use a 5" display and these with DSI. These types use a resolution of 1280x720.

Is it possible to reconfigure the demo project, that it will work with it?

2) What must be reconfigured in the demo project?

Thanks,

Korbinian

[Martin KJELDSEN]

Hi @KGlei.1​,

1) Depending on what you want to do, and the bitdepth of your application, you'll find any DSI-capable MCU from ST having a hard time with that many pixels. 800x480 is a stretch as it is now, even for an F769 using full screen transitions in 24bpp. So consider that.

2) You'll need to configure the LTDC+DSI HOST a bit differently, and configure the TouchGFX HAL slightly different as well since the drivers we use are, as you say, for 800x480. It's a matter of splitting the framebuffer into sections that are transferred one at a time until the entire framebuffer is sent.

The TouchGFX DSI driver itself will probably work as it is with your new display.

Let me know when you get closer.

/Martin