nrf9160 - Date and time

RE: nrf9160 - Date and time

schnitzlein — Fri, 19 Jul 2024 06:07:08 GMT

done: NRF_Modem lib
I am looking for a way of setting "the time" for lib_modem manually or for a counter/timer.

RE: nrf9160 - Date and time

Michal — Thu, 18 Jul 2024 13:21:39 GMT

Hello Christoph,

Please open another ticket for this.

Best regards,

Michal

RE: nrf9160 - Date and time

schnitzlein — Thu, 18 Jul 2024 12:49:30 GMT

Hi I have similiar Question(s)

related with the nrf9161-DK Board.

How can I set the time manually for the nrf_modem ?
How can I override and pass the date_time_evt_handler to the nrf_modem which is running?

Behind is the story of syncing some devices over the air...
Or is there some hidden layer which provides it on PHY Layer over the air ?

I understand that the LFCLK is the time source for the nrf_modem.
Can I simply sync those sources ? so far I know it is not that easy, maybe a counter or I need from the local board the frequency etc. phase and must pass those information to the other boards.

Can you help here?
I can open another question, but I thouth it is related.

kind regards
Christoph

RE: nrf9160 - Date and time

Michal — Mon, 07 Aug 2023 14:31:47 GMT

Hello and sorry for the delays.

I took over the case and I am looking into it.

[quote user=""]If the unit is backup by battery, and there is a reset and we are unable to obtain the datetime from the MODEM, does the datetime get cleared?[/quote]

I think so. The issue is that it the datetime should be kept in RAM, or else it would cause unnecessary wear on flash.

[quote user=""]Is there a way for me to prevent the driver from clearing the datetime?[/quote]

You could save it manually in the persistent memory, but like said before, the wear is an issue. I assume that the resets are random and not done manually/expected to happen?

Best regards,

Michal

RE: nrf9160 - Date and time

Raoul — Mon, 17 Jul 2023 23:08:37 GMT

Hi,

I've received your case and I'll try to answer it soon. We are low on staff during the summer holidays so it might take a bit longer than usual to answer, thanks for waiting!

Best regards,

Raoul