Random Fatal Error log message when powering up board

[Robin]

We are in the final throws of testing our boards that are based on the BLE UART Peripheral application.  The current test environment involves monitoring board and battery life conditions.

Occasionally, yet far too often for product reliability, after a battery crash (ie discharge below CPU function limits), when powering the board back up (applying battery charge source), a "Fatal Error" message is delivered via the logging system.  Sometimes there are no visible consequences to the board operation when this is event is noted, but far too often one or two critical conditions result:

1 ) The CPU  (NRF51822)  and will not properly boot and load/run the app unless the board power system is fully discharged, and/or,

2) Once booted, the contents of NVRAM (Board Cal, Sensor Cal, and board/battery life information) have been erased.

Neither of these conditions are, of course, acceptable for our product once in the field.

The log messages received give no other details as to what the Fatal Error is or what may have caused the event.

Can anyone please point me towards a way of troubleshooting what is causing these errors?

Thank you all kindly,

Robin@TL

[Vidar Berg]

Hi,

Please try to compile your project with "DEBUG" defined if you haven't done so already. It should result in a more verbose crash log if used together with the default app error handler (Error module). Error information may include the file name and line number of where the error occurred.

Regards,

Vidar 

[Robin]

Hello again Vidar,

Thank you for the response.  I am currently logging only "INFO" as I use this mode to trace the code execution.  I will set the flag for "DEBUG".  Will the info messages still print in DEBUG mode?

Thanks again, and happiest of Holday Seasons to you and yours.

Robin @ TL

[Vidar Berg]

Hello Robin,

The "DEBUG" flag does not impact the log level, that's a separate configuration option in the logger module. The flag is usually set like this if you use Keil:

[Robin]

Ah, I see, thank you very much Vidar.

Robin

[Robin]

Vidar, 

Where will these additional debug message appear? Are limited to the log config setting, or can they be directed to the BT UART port?

Thanks

Robin