Accurate network time [msec resolution]

[Ohad Gal]

Hello,

we are using the "AT%CCLK?" at it works very nice.

but now for the challange... since the modem is synchronized with the LTE network and sends on the designated time slot, the modem knows the time in accuracy better than 1msec.

will it be possible to get a synchronization pulse once a complete second ellapses? similar to how the GPS works with PPS

that is:

1. send AT%CCLK2?

2. wait for a pulse on a hardware pin GPIO (or an internal signal)

3. get the string with [sec] resolution as we get from the "AT%CCLK?" command

Does NORDIC support something like this?

This will eliminate the need for GPS if the GPS is used only for accurate time reception

Many thanks

Ohad.

[Albrecht Markus Schellenberger]

Hello Ohad, 

Does NORDIC support something like this?

According to 3GPP, which the nRF9160 follows, the network time accuracy will only be provided in sec resolution. 

This will eliminate the need for GPS if the GPS is used only for accurate time reception

will it be possible to get a synchronization pulse once a complete second ellapses? similar to how the GPS works with PPS

Although I very much understand your point and use case here, the nRF9160 unfortunately does not support this. The communication between modem and application core is done via a shared region of the RAM memory, where GPIOs are not involved at all. 

Regards, 

Markus