Using Timestamp in nRF9160

RE: Using Timestamp in nRF9160

Hadrien Kohl — Fri, 07 Jun 2019 15:36:05 GMT

According to the doc:

This routine returns the elapsed time since the system booted, in milliseconds.

Event though it's fine we can use this it is not an ideal solution since it means computing the datetime manually.

The battery consumption and power mode are also important factors. On a non embedded context I could simply ask for the time via IP but I'd rather have a real clock that runs even during low power modes.

Is the problem with de AT+CCLK commands something that you know about? Will it be fixed?

RE: Using Timestamp in nRF9160

Hakon — Fri, 07 Jun 2019 15:16:40 GMT

See my last reply. You can use the system clock.

RE: Using Timestamp in nRF9160

Hadrien Kohl — Fri, 07 Jun 2019 12:37:38 GMT

I tried that but I am getting ERROR back. Is there anything one should do to prepare the modem before sending this command?

Same goes for the AT+CCLK? command. Just getting ERROR. Even when I start with this one.

I tried to initialise the modem using lte_lc but it does not fix the problem.

I am using the latest alpha modem firmware.

RE: Using Timestamp in nRF9160

Hakon — Wed, 05 Jun 2019 13:33:34 GMT

The driver should be working fine, but the counter/alarm sample is currently not fully supported.

RE: Using Timestamp in nRF9160

Hakon — Wed, 05 Jun 2019 08:48:30 GMT

You also have the system clock, from which you can get a time stamp by using k_uptime_get().

RE: Using Timestamp in nRF9160

Hadrien Kohl — Mon, 03 Jun 2019 19:05:57 GMT

I've been looking into this as well. It seems that the RTC/Counter API is not yet implemented for the nrf91.

In this PR there is an implementation but I think it is related to the 52.
https://github.com/zephyrproject-rtos/zephyr/pull/8743

It is part of a bigger PR that unifies the timer and counter APIs in Zephyr.
https://github.com/zephyrproject-rtos/zephyr/pull/8340

Can someone from Nordic confirm?

RE: Using Timestamp in nRF9160

Hakon — Mon, 03 Jun 2019 13:57:56 GMT

Perhaps you can look at the counter example in the Zephyr sdk then. The library you are referring to is not supported on the nrf91 board.

RE: Using Timestamp in nRF9160

Mohammad Amin — Wed, 29 May 2019 23:35:02 GMT

Thanks. But the problem is the accuracy of +CCLK is in seconds. I want to measure the time in microseconds. That's why I want to use timestamp, however, still I couldn't solve its issue.

RE: Using Timestamp in nRF9160

Hakon — Wed, 29 May 2019 11:28:02 GMT

Hello, you can use the +CCLK at command to read the real time clock from the modem. You need to manually set the time first with

"AT+CCLK="yy/MM/dd,hh:mm:ss±zz", as described here.