[STM32f746-discovery]issue of useing different lcd screen

[AAhar]

hi i am using the STM32f746-discovery development board and i want to connect a 800 x 800 screen. I haven't yet received the screen I ordered ,but i started to make the application on 800x800 resolution .

everything runing good on the 480x272 (half window), but when i tried to change the resolution in the cube to 800x800 in the ltdc tab and in the graphics tab , the application start to run with a low frame rate and everything became slowley.

i guess the cause is that now the mcu have many more pixels to fill ,

so i tried to rise the clock for the ltdc in the clock tabs ,it seems to be fine at the begining but after few windows the app crashed. 

so i tried a different way , my screen size is 3.4" and my pictures are not complexity , 

so my questions are:

1)can i work with a resolution of 400x400 on a screen of 800x800 and still to be able to see everything on the same size ?

2) there is other way to handle that issue?

3) does the hardware have the capebility to that ?

thanks 

Avi.

[Martin KJELDSEN]

Hi,

Depending on the complexity of your application 800x800 is a lot for an F7 to handle. It's possible you won't get satisfactory behavior.

I don't fully understand your questions. Can you rephrase?

/Martin

[AAhar]

hi Martin thank you for response,i am asking is there a way that the mcu will act like he have a 400X400 screen and the app will be at the same size but in low resolution (on the 800x800 screen).

or do you have some ideas how can i try to handle it 

thanks