https://github.com/lvgl/lv_port_stm32h745i_disco => to stm32h750b disco

[pk84]

I am trying to get the https://github.com/lvgl/lv_port_stm32h745i_disco to run on the STM32H750 instead of the H745 disco.

I have selected the external loader and at startup the corresponding project loader. In the main.c file of the disco port project I have removed the QSPI inits.

I replaced the linker script file with the content from the linker script of LTDC_Paint example for the STM32H750.

It compiles and flashes everything without errors, but nothing works, also no LED starts.

What else do I have to adjust or should I consider?

[Pavel A.]

How do you expect the program to access the external flash after removal of QSPI init?

Have you tried to debug? 

[Tesla DeLorean]

Perhaps by doing the external memory initialization earlier, and in a loader, so as not to repeat, nor teardown the environment it's already executing in? H750 supposedly only has 128KB of FLASH

[pk84]

see screenshot below of my setup.

the lv_port_stm32h745.. project is loaded on the external QSPI flash (with external loader), so of course it does not need any QSPI init.

In the internal flash I load the STM32H750B_DISCO project, which is the program that makes the QSPI init + jump to the main program on the QSPI.

This internal flash program I already tested with another project (LTDC_Paint) and it works fine...

So that with the QSPI, external loader I should have considered, have I forgotten anything else?

I have no error, but even though nothing happens, no LED blinking, nothing...

[Tesla DeLorean]

Check the .LD file is building for the right memory space.

That SystemInit() points SCB->VTOR to the basis in memory where the vector table resides. Ideally use a symbol so that it just inherits the basis the linker is using auto-magically, instead of the stupidity ST uses..

extern uint32_t *__Vectors; // KEIL

SCB->VTOR = (uint32_t)&__Vectors;

extern uint32_t *g_pfnVectors; // GNU/GCC

SCB->VTOR = (uint32_t)&g_pfnVectors;

[Pavel A.]

Won't it be a good idea to copy the vectors to internal RAM?

[pk84]

as mentioned in the beginning, I replaced the linkerscript content of the lv_port project (STM32H745XIHX_FLASH.ld) with the content of the linker from the LTDC_Paint project STM32H750XBHx_FLASH.ld.

The LTDC_Paint project I could already test on external QSPI, and it works... so I assume the the linkerscript content should be correct, or is this wrong?

But maybe something is wrong in the lv_port project, so I tried to load this project first to the internal (128kB) flash and test it.

I have commented out as much as possible and only added a LED blink function.

Unfortunately I get the following error message when loading.

 

[pk84]

Could it be that the sysclock configuration of the STM32H745 is different from that of the H750?

[pk84]

ok, I forgot to change to internal flash in the ld-script, because of that I got the Error above.

So the lv_port program looks ok, at least the blink part... but I have no chance to make it work on the external flash - still nothing happens?? But no error.. how can I debug this? Or can somebody port this lv_port H745 to H750 for me?

--- edited by moderation team to ensure adherence to our community guidelines ---

[RomainR.]

Hello @pk84 

I hope my contribution can help you (a bit late)
https://github.com/rreicher/stm32h750bdk_lvgl_nos

BR
Romain

 

[Amaad]

Hey @RomainR. 

 

I would be so happy, if you reply to this request of mine.

 

I'm currently working on a project where I'm trying to integrate a board into the SquareLine Studio framework. However, I've run into an issue. I couldn't flash the LVGL demo successfully, even though I followed all the instructions you provided in this repo https://github.com/rreicher/stm32h750bdk_lvgl_nos

After flashing, the only thing I see is a blank screen, and I'm not receiving any error messages during the flashing or debugging process. Could you please help me troubleshoot this? Is there anything else I might need to consider or additional steps I should take?

Thank you so much for your assistance!

Best regards,
Amaad

[RomainR.]

Hi @Amaad 

I don't use or support SquareLine Studio.
The project I shared is designed for the STM32H750B-DK board.
A bootloader is programmed in internal Flash and the graphical application is stored and executed in the dual QSPI.
For this you have a specific linker configuration, and when programming, an external flash loader for the QSPI flash is necessary.
What hardware are you using?
Can you debug your code?

Best regards,

Romain,