STM32 LTDC with LVGL

[b1aze]

Hi all i have been working with LTDC module inside stm32 MCUs to drive an external parallel 24 bit RGB display , 

i integrated an LVGL UI inside this project  but my output is kinda look like this 

 i dont know what is causing it , . display is running at 11 mhz.

i am using nucleo H7A3ZI-q dev board with cortex M7

i asked in lvgl no response from them :sad_but_relieved_face: any help here 

i also tried to fill iw with two colors 50-by 50 theni got this 

  so i think that problem is not with LVGL .

 

<<<<<<<<<<<<update>>>>>>>>>>>>>>>>>>>

i was able to get this output bu changing the startaddress  from 

if i put 0x24000000 i get the misaligned one . but now the issue is if i integrate LVGL now while the startaddress is (uint32_t)framebuffer , i get nothing in display , if i chnage that to 0x24000000 i get the misaligned output of LVGL 

 

 

 

 

[KDJEM.1]

Hello @b1aze ;

 

-> now the issue is if i integrate LVGL.

LVGL is not an ST implementation. I recommend you to contact the LVGL on their forums. 

Have you tried asking at https://forum.lvgl.io/ ?

 

Thank you.

Kaouthar

[b1aze]

yeah it was a framebuffer glitch , I fixed it myself. can you tell me how to increase the speed so it can copy to memory faster than usual

i tried changing the sysclock,AHB buses from 64 to 100 is that ok ? 

[KDJEM.1]

Hello @b1aze ;

 

It is recommended to use the highest system clock to get the best graphic performances.

The pixel clock is a key parameter for checking display size compatibility with a specific hardware configuration.
The computed pixel clock need to respect the display specifications.
The pixel clock for a specific refresh rate is calculated with the following formula:
LCD_CLK (MHz) = total screen size x refresh rate
Where total screen size = total width x total height

For mor information I recommend you to look at Introduction to LCD-TFT display controller (LTDC) on STM32 MCUs - Application note precisely section 5.2.2 Checking display compatibility considering the memory bandwidth requirements.

 

Thank you.

Kaouthar

[b1aze]

LCD clock is configured to support the LCD I have , what i am talking about is the system clock , AHB bus clock, peripherals clock and all that, and does the increase in these clock increase power consumption . 

[mƎALLEm]

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@b1aze wrote:

 does the increase in these clock increase power consumption . 

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Please don't ask many questions in the same thread. Please keep one question per thread.

Thank you for your understanding.