Unable to Store TouchGFX Assets in External Flash using OCTOSPI1

[Furkan2]

I am trying to interface STM32U5G7VJT6 with MT25QL128A using OCTOSPI1 in Quad SPI mode, but I still cannot store/run TouchGFX assets from external flash memory.

Current configuration:

• Memory Type: Micron
• Device Type: Flash
• Device Size: 24
• Clock Prescaler: 2
• Clock Mode: Low
• Sample Shifting: Half Cycle
• Wrap Size: Not Supported
• Delay Block: Bypassed

Screenshot attached.
Could someone please check if I missed any important configuration like memory-mapped mode, linker settings, TouchGFX asset location, BSP/init sequence, or MT25QL128A command setup?

[KDJEM.1]

Hello @Furkan2;

--> Screenshot attached.

Could you please add the screenshot.

Can you do read and write operations on the external flash memory?

I recommend you to look at AN5050 section "7 OCTOSPI application examples" may help you.

Thank you.

Kaouthar

[Furkan2]

Thank you for your response.

I have attached the OCTOSPI1 configuration screenshots and related settings.

Currently, I am not able to MT25QL128A external flash memory, so TouchGFX assets are also not working from external flash.

I will also check AN5050 section 7 as suggested.

[KDJEM.1]

Hello @Furkan2;

Thank you for these details.

Is the problem solved when displaying TouchGFX and read/write operations from external buffer?

Thank you.

Kaouthar

[Furkan2]

Dear Kaouthar,

Thank you for your support.

The external flash read/write operation is working correctly now, and the external buffer is accessible in memory-mapped mode.

However, the TouchGFX display issue is not fully solved yet. The LCD no longer stays completely white, but the image rendering is unstable/blurry and sometimes becomes white again during TouchGFX execution.

Currently:

• External OSPI flash read/write: Working

• Memory-mapped mode: Working

• LTDC initialization: Working

• Framebuffer in SRAM: Configured

• TouchGFX rendering: Still unstable

I am currently checking LTDC timing and framebuffer configuration.

Thank you.

[KDJEM.1]

Hello @Furkan2;

I advise you to look at Introduction to LCD-TFT display controller (LTDC) for STM32 MCUs - Application note and How to set up the LTDC peripheral to interface with the display panel ATM0500D27-CT from AZ Displays may help you. 

Thank you.

Kaouthar

[Furkan2]

Thank you for your response.

I will review the application note “Introduction to LCD-TFT display controller (LTDC) for STM32 MCUs” and also check the example for interfacing the ATM0500D27-CT display panel.

Currently, the external OSPI flash memory is working correctly in memory-mapped mode, and read/write access is successful. However, the TouchGFX display is still showing a white/blurry screen issue.

I will verify the LTDC timing and framebuffer configuration again based on the provided references.

Thank you for your supports