FAQs
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

STM32F4 Resetting itself (Nucleo 64)

Andres Cao
Associate III

‎2017-04-13 03:58 PM

Posted on April 14, 2017 at 00:58

Hi!

I have a Nucleo64-446RE and every 5/10 minutes the board resets itself.

I'm using the Virtual COM to send data to my PC and plot it (among many other things), and when the board resets I lose the Serial connection. I need to re-open it in order to plot again. If after this reset I want to program the microcontroller I get the ''Unable to reset target'' message for which I need to unplug and replug the USB(which is also powering the board). I'm using the System Workbench for STM32.

Here's an oscilloscope picture of the NRST pin (blue), which confirms the reset. The red trace is a 3.3V pin, which shows there are no power issues. 

0690X00000606kYQAQ.png

Can you please help me debug this reset?

As I understand, it can't be a Hard Fault because (I think) in that case the system wouldn't reset but end up in an infinite loop. I haven't implemented any of the error handlers, but I think they're implemented by default with weak attributes.

Watching the following image:

0690X00000606llQAA.png

From external sources:

  • Definitely I'm not pressing the reset button
  • The ST-LINK could be resetting. How likely is this, why would it? Given that Virtual Com connection is lost it could be the case, since if I press the reset button the Virtual Com connection is not lost.

From internal sources:

  • WWDG is not activated
  • IWDG is not activated
  • Red trace would prove it's not a power reset
  • There's no lower-power mode being used.
  • Software reset, this would be the only option. What causes a software reset?

Thank you very much in advance for all your input!

Cheers,

Andrés

51 REPLIES 51
BBloc.1933
Associate

‎2019-12-03 01:30 PM

Thank you for all your work, I'm experiencing something very similar with the STM32L475xx Discovery IoT board. running on a dell precision 5520. It still resets my board even if I'm not debuggin, but as previously mentioned that would probably be solved by not using the st-link for the power. You have given me some areas to look into for the cause of the resets :D

0 Kudos
nedsar85
Associate
In response to Gregory Hancock

‎2023-07-02 04:52 AM

Hi Gregory, thanks for your help... I tried to do this and it worked, but, later I tried to change the arduino code to program it to my STM board and now the board is not accepting changes. It seems that arduino compile is done, but the board doesnt save the new program. I have tried to enable the MBED microcontroller USB device, but the same problem remains... Do you know how to solve this issue? Thanks

0 Kudos
Top