nrf54l15-dk rtc

[dede]

Hi,Team,

I'm currently using the nrf54l15-dk. I want to set the rtc of the nrf54l15-dk to obtain the timestamp. How should I configure the rtc? Which examples should I refer to?
My ncs version is v2.8.0.

Thanks.

[Kazi Afroza Sultana]

Hello,

Peripheral_cts_client sample can be a good start if you want to apply calendar timestamps via BLE. It shows connect/bond, read the Current Time characteristic, parse and print the time, and handle notifications, matching your “set/read timestamp” flow with a CTS-capable peer device.

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/peripheral_cts_client/README.html#testing 

[Kazi Afroza Sultana]

can look at this sample: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/peripheral_cts_client/README.html#testing 

[dede]

Hi,

I think this example doesn't quite meet my requirements. I want to directly call API to set and read the timestamp. How should I do it?

Thanks.

[Bruce2048]

I agree with you.

In this example GRTC was even not enabled.

If possible, could you provide us with an example?Kazi Afroza Sultana 

Thank you.

[Kazi Afroza Sultana]

Hello,

You can use UNIX timestamp (using Date time+ k_uptme_get. UNIX timestamp requires that the data time library has obtained a valid time first (e.g., via data_time_update_async or data_time_set), then coverts uptime UNIX time. source: date_time group; date_time.h

In the prj.conf file you need to set the following config to enable GRTC SYSCOUNTER :

# Ensure GRTC SYSCOUNTER is started by the driver on boot (nRF54L15)
CONFIG_NRF_GRTC_START_SYSCOUNTER=y

 Now in the app code, you can follow the following steps:

a. Initializing Date Time library and setting valid time

2. Initialize Date Time library and set valid time. source ( [date_time API; date_time.h])

3. Converting uptime to UNIX time (ms) when you need a timestamp

• After time is valid: int64_t ts = k_uptime_get(); date_time_uptime_to_unix_time_ms(&ts); // ts now holds UNIX time in milliseconds This API specifically converts a k_uptime_get() value to UNIX time using the maintained offset. [date_time.h; date_time group]

An example code

int64_t uptime = k_uptime_get();
date_time_uptime_to_unix_time_ms(&uptime);

// At this point `uptime` contains the unix timestamp in milliseconds.