Save Log Module output to a file

[Deus Matei [EMERSON]]

Hi,

We're running NRF5340 with a 8MB flash attached to it. We would like to save log messages to a file in device memory. We have configured successfully littleFS to work with external flash. I think it should be possible to use a custom backend to store those prints to a file but I wasn't able to find an example of how to implement a custom backend. 

Maybe first question will be if this is possible, if yes please help with some information on how to implement a custom backend for log module.

Kind regards,

Matei

[runsiv]

Hi, Deus

This should be possible, Zephyr has support for custom backends. 

The Kconfig seting CONFIG_LOG_BACKEND_FS should be used

So you will need to set the following in prj.conf

 

CONFIG_LOG=y
CONFIG_LOG_BACKEND_FS=y
CONFIG_LOG_BACKEND_FS_FILE_SIZE=
CONFIG_LOG_BACKEND_FS_FILES_LIMIT=
CONFIG_LOG_BACKEND_FS_DIR=

Regards

Runar

[Deus Matei [EMERSON]]

Thank you ! This worked for me!

[runsiv]

Glad to hear it worked for you. If you could set the post to verfied answear it would be awesome. It could help others if they have the same question in the future. 

Regards

Runar