Without extern RAM of stm32H757i evk board we run led display?

[khodifadlalit]

how Mach resource required for run led display in stm32H757i evk ?

i am working on stm32H757i evk, my actual product have not external ram.

but i have run lcd display in my project.

without external ram i can run display?

my display is not more sophisticated gui, but simple data display on lcd,

please help me guide how mach ram required for my simple gui application.

[SofLit]

Hello,

It depends on the size of your display and its resolution.

Please refer to the AN4861 "LCD-TFT display controller (LTDC) on STM32 MCUs"

[khodifadlalit]

i use 

4” 480×800 TFT color LCD with MIPI DSI® interface and capacitive touch
panel.

so how Mach  Ram need ?

[SofLit]

Again, please refer to the AN4861 "LCD-TFT display controller (LTDC) on STM32 MCUs" and section 4.2.1 Framebuffer memory size requirements and location. The details of the frame buffer size computation are there.

[Tesla DeLorean]

Much

At least 768KB for a frame buffer

Alternatively get a display with its own buffer.

[khodifadlalit]

i have already 8 mb extern sram are connected and i use stm32H757 microcontroller and my display is

4” 480×800 TFT color LCD with MIPI DSI® interface and capacitive touch.

and my  gui is simple data display on lcd, that 8mb external ram is sufficient ?

ya need 32 mb  external sdram ?

please guide me 

[Tesla DeLorean]

8MB (64Mb) would be more than sufficient to sustain the display.

I'd probably go with 32-bit wide bus.

Cost difference for larger SDRAM might be somewhat marginal. Pick parts which ship in large volumes, and have long-term availability.

[khodifadlalit]

sorry but i have only 1M x16bit (IS61WV102416BLL-10MLI ) sram memory in my board.

that  sufficient to sustain the display.?

[Tesla DeLorean · Accepted solution]

Well that's 16 Mb (2 MB) not 8 Mb. So yes, that will get you two screen buffers, and some additional slack for icons, and resources.