NRF_LOG to External Flash

[ran]

Hi, 

I have an external flash ( via QSPI ) working on NRF52840 Based product. 

I'd like to redirect all NRF_LOG message to a file , is there a similar log backend available ? 

If not - what will be the best way to go about it ? 

The reason is that I do not have CLI on the final product, but I do have access to the file stored on the external flash via USB MSD Driver. 

Thanks, 

Ran 

[Vidar Berg]

Hi Ran,

You could use the existing flash backend as a starting point to make your own "QSPI flash" backend. A potential problem with this approach, though, is that the logger as is own way of storing the data to flash - instead of storing entire log messages in cleartext, it saves serialized logger objects with pointer references to text strings in internal flash. This is an optimization that avoids duplication of text strings that may occur in the log more than once. So maybe it would be easier to not go through the logger module but write important log messages directly to your text file instead?

[ran]

Thanks. I was trying to avoid writing directly to flash and use NRF_LOG , that would have NICE :) 

But I accept you suggestion , Thanks, 

While it makes sense, Is there a flag to disable NRF log optimization ? 

Ran

[Vidar Berg]

Hi Ran,

Unfortunately, to me, it looks like it would take a bit of work to change logging format. Maybe it could make sense to use the  CLI "flashlog read" implementation to read logs from the internal flash re-direct it to log file in stored externally.

Vidar