cancel
Showing results for 
Search instead for 
Did you mean: 

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

khodifadlalit
Associate II

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.

 

1 ACCEPTED SOLUTION

Accepted Solutions

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.

Tips, buy me a coffee, or three.. PayPal Venmo Up vote any posts that you find helpful, it shows what's working..

View solution in original post

8 REPLIES 8
SofLit
ST Employee

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"

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

i use 

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

so how Mach  Ram need ?

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.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

Much

At least 768KB for a frame buffer

Alternatively get a display with its own buffer.

Tips, buy me a coffee, or three.. PayPal Venmo Up vote any posts that you find helpful, it shows what's working..
khodifadlalit
Associate II

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 

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.

Tips, buy me a coffee, or three.. PayPal Venmo Up vote any posts that you find helpful, it shows what's working..

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

that  sufficient to sustain the display.?

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.

Tips, buy me a coffee, or three.. PayPal Venmo Up vote any posts that you find helpful, it shows what's working..