How to use Time-sync in nrf52840

RE: How to use Time-sync in nrf52840

Sigurd — Fri, 10 Jan 2020 14:53:19 GMT

Ok. If you want to a local clock running on your end-device, then the nrf5-calendar-example is good starting point. The nrf5-calendar-example example uses RTC0 by default, you should change this to use RTC3 when integrating it in the Thread application. Might also want to set CAL_RTC_IRQ_Priority to 6

RE: How to use Time-sync in nrf52840

Yogeshwar — Thu, 09 Jan 2020 14:25:14 GMT

By packet here I meant Thread packets
My thread Network gateway is sending the packets
Yes, the data here is updated clock data

RE: How to use Time-sync in nrf52840

Sigurd — Thu, 09 Jan 2020 11:45:05 GMT

[quote userid="80579" url="~/f/nordic-q-a/56237/how-to-use-time-sync-in-nrf52840"]I wanted to sync time on End Device(nrf52840DK Board) via sending packets to it. What should I do?[/quote]

Could you explain this some more.

1) What do you mean by sending packets to it ? Is this BLE packets?

2) What type of device is sending the packets to the nRF52840 ?

3) what data is the device sending to the nRF52840? updated clock data?

[quote userid="80579" url="~/f/nordic-q-a/56237/how-to-use-time-sync-in-nrf52840/228033"]Can somebody explain to me what is meant by calibrated and uncalibrated time in this example[/quote]

You can update the time with the function nrf_cal_set_time() several times. The second time you call the function, it will calculate the difference between the first and the second time you set. Based on this difference it will produce a "m_calibrate_factor" that is used to estimate the drift the clock had. When knowing how much the clock is drifting, we can adjust for this in the “calibrated” time.

RE: How to use Time-sync in nrf52840

Yogeshwar — Wed, 08 Jan 2020 07:45:35 GMT

I took a reference from https://github.com/NordicPlayground/nrf5-calendar-example,
but there were certain things I didn't get.

Can somebody explain to me what is meant by calibrated and uncalibrated time in this example