Implementing my own NRF_LOG backend.

[xcepti0n]

Hi,

I am beginner in nordic development.

Requirement: I need to store logs in internal file system.

Device - nrf52840 DK,

SDK - nRF5_SDK_15.3.0

I understand that nrf_log output is limited to backends - UART/RTT/CLI, But I want to log into a file in internal file system.

So I was implementing my own backend which uses fatfs to store log in file. I want it to be asynchronous. As nrf_log has option to defer the logging. I wanted to ask if ring_buf is already implemented in frontend or is specific to backend?

Or I have to use implement my own ring buffer (circular queue) which is enqueued during .put and dequeued during flush?

Any guidance will be helpful thanks for your help.

[awneil]

xcepti0n said:

I am beginner in nordic development

Do you have experience in any other type(s) of development - particularly, other embedded microcontroller(s) ?

Have you studied the Logger module documentation:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_nrf_log.html?cp=5_1_3_26

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/group__nrf__log.html

Backend API:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/group__nrf__log__backend__interface.html

Note that there is already an option to log to Flash:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_nrf_log.html?cp=5_1_3_26_5_0#nrf_log_backend_flash

[xcepti0n]

Yes I have gone through the nrf_log documentation. I know that nordic provides option to log to flash but for my use-case I want to store logs into a file with daily or hourly rotation functionality. As far I have understood from the flash backend implementation, it writes to a memory location instead of using a file system (eg. fatfs).

I don't have much experience with embedded but I know a bit. Always happy to learn something.