How to determine if flash write has completed using zms_write() or nvs_write()

[Nick_RA]

NCS 3.02 + nRF54L15

I'm troubleshooting a potential bug. Are these blocking routines, or if not how do I monitor for successful completion of flash write? I looked the the API docs and the ZMS sample project but neither give any clue.

My concern is if the system is rebooted too soon after saving might result in corruption.

Thanks

[Emil Lenngren]

The APIs are blocking. Other threads and interrupt routines might run while the operation is ongoing though.

I wouldn't use ZMS at this stage though since I wouldn't call the code stable/bug-free yet. I found many bugs when I inspected the code some time ago, see e.g. https://github.com/zephyrproject-rtos/zephyr/issues/88373 and https://github.com/zephyrproject-rtos/zephyr/pull/87809#issuecomment-2787666716. There are still bugs remaining that have not been fixed.

[Nick_RA]

Emil Lenngren said:

I wouldn't use ZMS at this stage though since I wouldn't call the code stable/bug-free yet.

Is this official Nordic advice? According to another ticket that ZMS is the way to go for nRF54L.

Vidar Berg said:

nRF54L requires the ZMS backend while all others use NVS.

[Emil Lenngren]

No, this is my own advice after thoroughly reading the code of ZMS and inspecting its quality, and finding many bugs. I wouldn't use it in its current state since the storage can become corrupt. I found issues where corruptions could be possible with power cuts as well as even without power cuts.

Since data integrity is pretty vital, I'm a bit surprised that no one has fixed the issues I reported as of now.