STM32F746 Freeze And Debugger Lost Connection

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Hello everyone,

I have a custom board with STM32F746. I'm using STM32CubeIDE for this project.

Board(s) working as expected. But after a while it stops working.

At this point debugger connection also lost. I can not trace anything.

Also ST-Link Utility can't connect to device via Hot-Plug.

It needs to hardware reset for working again.

Is anyone faced something like this?

What i'm missing about debugging?

I'm using SDMMC, Ethernet, FMC, SPI and timer and external interrupts.

Thanks.

[JoniS]

Schematic of the board could help.

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Ive done couple stm32xxxx based boards and none of them have had such proplems.​

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Hi, thanks for answer.

I'm sure that it is not a hardware problem. Because when i change size of buffers which im using issue disapears.

Its probably my mistake in software. I think mcu enters lockup state. But i cant see anything when it hangs.

[JoniS]

Can you share the code? All of it

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I cant share all of the code sorry. It is a commercial project. I know it is strange i need help and dont share all of the code but it is the situation.

Also project consist almost 60 files except hal and third parties. It will a bit hard to understand what happenning. I just need to know how can i see what happening on mcu.... Thanks.

[Piranha]

Another idea - using low-power modes, but not enabling the corresponding bits in DBGMCU_CR register.

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I'm not using low power modes. Thanks.