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controller getting restarted

sachinVerma
Associate

‎2025-01-28 02:43 AM

Dear ST Community,

I have been working on the firmware which contains the AT commands modem, Winbond flash memory. After some time I have relised the microcontroller is automatically getting restarted/. I had doubt on the hardware then  we have redeveloped the complete hardware from known pcb designer, but again we are facing the same problem. I have printed the stack details also but not able to find the following issues: 

1. Stack overflow.

2. Buffer overflow.

3. dereferencing unassigned memory.

4. power supply issues.

The restart is so random so that we are not able to understand and figure out the section. Also the PC shows the random values.

 

Thanks and Regards

Sachin Verma.

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Ozone
Lead II

‎2025-01-28 03:44 AM

I think you need to reproduce the behavior at your desk / lab.

Then, check the RCC CSR register. Here a snapshot from the F40x manual :

Ozone_0-1738064516313.png

 

And here a list of reset causes, from the same manual:

Ozone_1-1738064644153.png

 

You don't have a watchdog activated in your firmware, do you ?

Andrew Neil
Guru

‎2025-01-28 04:05 AM - edited ‎2025-01-28 04:11 AM

Welcome to the forum.

For best results, please study How to write your question to maximize your chances to find a solution; some more details would help: 

 

@sachinVerma wrote:

the AT commands modem, .

What "AT commands modem"?

Please post the board schematic.

 

@sachinVerma wrote:

not able to find the following issues: 

So what tests have you done in an attempt to find those issues?

If your "AT commands modem" is a GSM (or any other radio) device, remember that these have very "peaky" current draw - the peaks demand careful power supply design, and can easily cause problems like "brown-out".

As @Ozone said, your can read the reset reason.

Do you have a watchdog enabled?

Instrument your code so that you can see what's going on.

 

PS:

Some tips here on instrumenting code so you can see what's going on without intrusive debugging:

https://community.st.com/t5/others-hardware-and-software/how-to-safely-debug-critical-circuits/m-p/765495/highlight/true#M30580

 

Some tips on debugging in general:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/tac-p/706966/highlight/true#M49

#InstrumentCode

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