Device reset in specific device.

[Chongchun Moon]

Hello,

  I am using NRF52832(WLCSP package) and nRF5_SDK_15.2.0 for the product.

  I also use IAR Embedded workbench 8.32.1 as IDE.

  Few hundreds devices are assembled in factory line.

  In that event, I met one device which has weird situation.

  It is supposed that device is hang in somewhere, It makes system reset.

  If I add unused code, that situation is gone. or If I change optimization option, that situation is gone also.

  It looks like it may related alignment. But I don't know.

  Do you have any idea why this situation is occurred? 

  And, Please tell me how to approach to resolve this situation.

  If you need more information, let me know please.

Thanks,

   Chongchun Moon

  

[Simonr]

Hi

Could you specify how it hangs, and at what point in the code it does? Seeing as this only occurs in one device, my guess is that whatever peripheral/component the device is using when your application hangs, is not properly soldered/connected.

Best regards,

Simon

[Chongchun Moon]

It does read pressure sensor data using TWI. But it doesn't look like soldering issue or connected issue.

As I wrote in previous, If I change optimization option or add unused code, problem is not happened.

Thanks,

   Chongchun Moon

[Simonr]

Does the unused code use the TWI peripheral as well? All your devices have the same code, correct? And none of the other devices show the same error? This makes it hard to believe that it is a firmware issue in any case. 

I don't understand what you mean by "it may related alignment". Could you try to elaborate on this?

Best regards,

Simon

[Chongchun Moon]

Yes, Unused code is just copy of Using TWI peripheral. No body calls that code. It only happen on device for now.

What I mean "alignment" is code alignment or memory alignment by giving compilation option. It may also code placement by linker. Because If I add unused code or change optimization option in compiler, address is rearranged by linker and compiler.

Thanks,

  Edgar

[Simonr]

Hi

Sorry, but I'm really struggling to understand what you mean. What do you change the optimization option from and to? You're saying the issue doesn't occur when you change the memory settings, correct? If the memory settings are wrong, you should get an error from the SoftDevice telling you what these setting should be.

Do you get an error of any kind when you flash your firmware to this device?

Best regards,

Simon