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?

[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,

[Amaad]

Hallo Romain,

Thanks very much for the reply, i appreciate it!!

I did exactly how it was mentioned in the README.md. (added external loader and positiones SP and PC as mentioned)

I am using STM32H750B-DK.

Yes, i can debug, but getting this error: No source available for "_binary____ExtMem_Boot_bootloader_bin_start() at 0x8000972" (even though i have excluded EXMem_Boot directory)

Thanks very much in advance

BR,

Amaad

[Amaad]

Hi Romain,

Is there any update, i’m really stuck in here :crying_face:

VG,

Amaad

[RomainR.]

Hi @Amaad 

Can you check the following steps:

1°) Use latest STM32CubeProgrammer, connect to STM32H750B-DK using STLink.
Enable MT25TL01_STM32H750B-DISCO NOR Flash External Programmer:

2°) Then Perform a full chip erase of external sector (0x9000 0000 External NOR Flash)

3°) Do also an erase of internal Flash at 0x0800 0000.

Last point, check Boot address Option Bytes: BOOT_CM7_ADD0, value=0x800, address = 0x0800 0000. 

4°) Clone again my Github repository.
$ git clone https://github.com/rreicher/stm32h750bdk_lvgl_nos.git

Import the project in a fresh STM32CubeIDE workspace locally. Build it and check the result must be the same than below:

Open the Debug configuration and follow the section "How to use it" of the Readme.md and apply the same configuration:
- Add external loader MT25TL01G_STM32H750B-DISCO.stldr
- Set SP and PC counter as explained.

5°) Start the debugger, and wait for the end of download.
When the windows _binary____ExtMem_Boot_bootloader_bin_start appears, close it and open the main.c file.
Click on Reset the chip icon below:

Now you should see debug cursor available  at the beginning of main function (line 70).

Place a breakpoint at HAL_Init() (line 84)

Finally click on Resume icon (F8) you should see the LVGL demo on the screen.
Close the debugger, and play with the graphic demo.

I checked again on my board and the project is working.
I hope it will help you?

Best regards,

Romain,

[Amaad]

Hello Romain,

YES IT HELPED!!! I really wanted to sincerely thank you for your incredible help with getting started with the STM32H750B discovery board. Your detailed explanations and step-by-step guidance made all the difference. I was finally able to flash the demo on the board successfully! 

I was also wondering whether i can use micropython bindings in LVGL, it is even possible? When yes, can i still access all the peripherals of this board and the most important question, whether STM32H750B-DK is currently supported by lv_micropython. I would really appreciate few words from you regardinhs the same.

Best Regards,

Amaad

[RomainR.]

Hello @Amaad 

Good news, in that case thanks you to mark my reply as resolved and answered.

Concerning your Micropython, sorry I don't have a port of this demo to micropython. And I don't know if there's a port for STM32H750B-DK board.
You should ask the relevant forums.
https://github.com/orgs/micropython/discussions

https://forum.lvgl.io/

Best regards,

Romain