Hardware Selection for Advance HMI

[ZExpo.1]

Requirments-
LCM->1024x600 TFT With CTP and Or 1028x 800 LVDS TFT With CTP
Color Depth-> 24bpp
FPS-> ~30
MCU-> _________?
RAM-> __________?
QSPI-> __________?

I have Selected the following Hardware But need expert opinion on this subject
My Selection-

MCU->STM32H750 BGA
SDRAM-> 16 BIT (IS42S32400F-6BL)QSPI->MT25QL512

The above parts are used in STM32H750B-DK

[MM..1]

Hi try read an4861-lcdtft-display-controller-ltdc-on-stm32-mcus-stmicroelectronics.pdf

and self reply.

MCU without internal flash as 750 NO

SDRAM 16bit NO

QSPI any high speed

[LouisB]

Hello @ZExpo.1 

As @MM..1 suggested, you should read the document to get more insight on why and what you need.
I'am adding some information on what @MM..1 suggested you :

• Having a 1024*600 screen with 24bits with a lot of GUI/Animations, will engender a lot of memory transfers.
  The bottleneck is the framebuffer access that will be done by the same bus for the LTDC and the graphic acceleration (ChromART/NeoChrom).
• In that case, you will either need a 32BITS SDRAM or a screen with embedded memory.
  If you are using a complex GUI with a high-resolution screen, a MCU with internal flash ram is mandatory to store your framebuffer.
• And a high speed QSPI is also needed with complex UI for a faster data transfer.

I hope it helps,

Regards,

[ZExpo.1]

Thanks for the suggestions , As you specified in the 3rd bullet point that " In that case, you will either need a 32BITS SDRAM or a screen with embedded memory.
If you are using a complex GUI with a high-resolution screen, a MCU with internal flash is mandatory to store your framebuffer "

or You are saying I can use the Dual QSPI Setup as in STM32H750b-dk Board as external flash?

[MM..1]

@LouisB make mistake in flash vs framebuffer. He mean high-resolutions screen require hign size graphics stored in flash (fonts images) . When your graphics is in internal flash bus overload go lower as for external QSPI.

[LouisB]

Internal RAM not flash, my bad.

[ZExpo.1]

So I got the following Calculation:-

Screen Resolution- 1280 x 800
Color Depth-24 Bpp

Framebuffer = (Resolution L * Resolution W * Color Depth)/8
=3,072,000 Bytes or 3.072 MB

 

For 1024 x600 TFT

Screen Resolution- 1024 x 600
Color Depth-24 Bpp

Framebuffer = (Resolution L * Resolution W * Color Depth)/8
=1,843,200 Bytes or 1.8432 MB

So what will be the calculation to get the FPS out from the system using CPU Frequency, RAM Bandwidth?

 

[MM..1]

Simple math for example 60Hz == 3Mx60 one sec frames RAM trought 180MB/s (16 bit RAM 90MHz ...)

And calculations must be from oposite side you choice FPS and setup all clocks acord...

[ZExpo.1]

So to get 30 FPS at

Screen Resolution- 1024 x 600
Color Depth-24 Bpp

what system has to be implemented?