New hardware working problem.

[Yunus ARI]

Hi everyone,

We working on a project with touchgfx software. We designed a new hardware for this project. Our custom hardware has this components;

• STM32F746BET processor
• IS42S16800F-7TLI SDRAM (128Mb , 143MHz)
• MT25QL128ABA1EW9 QUAD SPI NOR FLASH (128Mb, 133MHz)

We able to access flash and ram. Code able to work in processor.

When I want to draw a box or something that can be drawable with code, screen working fine.

But when I want to draw an image from flash, screen go crazy.

You can see an example this situation;

What can you say about it? Is this can be fixed with software or we need to review our hardware?

Thanks in advance :).

[Martin KJELDSEN]

Have you made sure to program the external flash? Could be reading garbage.

[Yunus ARI]

I have been working on it several days. I tested sram for make sure all bits working. I checked that the flash is programing correctly. I think problem it's coming out when system get data from flash to sram. I focus on DMA2D interface right now.

I add some picture of debug code. You can see memory section of flash that include a test image (Memory 2) and memory section of sram that include frame buffer (Memory 1) . And you can see _test array for this image in "Live Watch" window.

If you look image can see some irrelevant values in ram memory. You consider this is a sram problem but I need to say that, I tried fill sram with direct access and this worked fine. Because of that I thinking it's a DMA2D problem. But I can't prove it :)

[Martin KJELDSEN]

Have you compared the data in external flash with what is being generated by TouchGFX based on your image? (generated/images) folder - Just to be sure that the data is written correctly to flash by your flash loader.

/Martin

[Yunus ARI]

Yes I did that. It's look correct.

[Martin KJELDSEN]

Also, can you try storing a small image in internal flash instead and reading from there?

[Yunus ARI]

How can I to do that. As far as I know, TouchGFX is loading image to external flash automatically.

[Martin KJELDSEN]

How did you create the project? Seems like some syncronization may be off. Can you try adding the following line when configuring your TouchGFX HAL?

hal.lockDMAToFrontPorch(true); 

[Yunus ARI]

I working on this project for a long time. I was running this code in STM32F7-Discovery board before this new hardware.

[HP_it]

really looks like the External flash is not being loaded properly.

how do you load the external flash? Using Cube-Programmer or something else?

Cube-Programmer can both read and write to your flash using the external loader (<-- this is most likely the culprit)

I spend quite some time on that loader and there's very little info to go on. can you make absolutely sure that your loader is working?

I ended up with using the exact same QSPI chip as on the dev-board and lucky for me I was able to obtain an external loader with my pin-configuration (something to look out for as well!)

[Yunus ARI]

I loaded flash with using IAR 8.20 ide. I can see inside the memory when debugging. I compared flash and sram when program running. I added a picture of this debug in previous posts. I quite sure flash is loaded properly.

[Martin KJELDSEN]

But does the IAR project have a specific external flashloader configured? But you did say that you'd verified the contents of the external flash with the pixel data of the generated image.

/Martin