nrf52840 RCT2 configuration and usage

RE: nrf52840 RCT2 configuration and usage

Susheel Nuguru — Tue, 29 Jul 2025 11:53:01 GMT

sorry Egor, This thread somehow slipped from my active queue. No, I did not test your project, and do not think that I can do it until next week either. Sorry about that.

RE: nrf52840 RCT2 configuration and usage

Egor Dolgalev — Thu, 24 Jul 2025 08:53:13 GMT

Hi,

Any updates on this issue?

RE: nrf52840 RCT2 configuration and usage

Egor Dolgalev — Fri, 23 May 2025 13:35:37 GMT

Hi Susheel,

I tried to change rtc0 to rtc2 and got the same result. The read output after time set command is:

{
  "datetime": "2948-01-00T00:45:00"
}

The option CONFIG_COUNTER=y is enabled in my original project.

I attached updated project.

devzone.nordicsemi.com/.../6114.os_5F00_mgmt_5F00_datetime.zip

RE: nrf52840 RCT2 configuration and usage

Susheel Nuguru — Thu, 22 May 2025 12:05:00 GMT

Hi Egor,

I wanted to try to pitch in my 2 cents here.

I am suspecting that this is because you have not enabled the counter API

Enable this in your prj,conf using RTC2 just to be sure since rtc0 is used by RTOS.

CONFIG_COUNTER=y                    
CONFIG_RTC=y  
CONFIG_NRFX_RTC2=y

also set this your overlay instead of rtc0

aliases {
    rtc = &rtc2;
};

&rtc2 {
    status = "okay";
};

I have not tried your sample but if this does not work, then i will try to debug your app on why you have simple date and time feature not working.

RE: nrf52840 RCT2 configuration and usage

Susheel Nuguru — Thu, 22 May 2025 12:05:00 GMT

Hi Egor,

I wanted to try to pitch in my 2 cents here.

I am suspecting that this is because you have not enabled the counter API

Enable this in your prj,conf using RTC2 just to be sure since rtc0 is used by RTOS.

CONFIG_COUNTER=y                    
CONFIG_RTC=y  
CONFIG_NRFX_RTC2=y

also set this your overlay instead of rtc0

aliases {
    rtc = &rtc2;
};

&rtc2 {
    status = "okay";
};

I have not tried your sample but if this does not work, then i will try to debug your app on why you have simple date and time feature not working.

RE: nrf52840 RCT2 configuration and usage

Egor Dolgalev — Tue, 20 May 2025 13:39:29 GMT

Hi Simonr,

In my original project I don't use this example. But I adopted the test you mentioned to reproduce this issue. I attached my project. I did a build for nrf52840dk board with RTC0 used and SDK 3.0.0 version. To test date-time set/get functionality I use AuTerm tool and analyzed the terminal traffic to see what is inside the packets.

I did next command sequence:

1. Get current time

2. Set current time

3. Get current time

The traffic looks like the next:

\06	AAsIAAABAAANBKBXIA==
\06	ACkJAAAfAAANBL9oZGF0ZXRpbWVzMjk0OC0wMS0wMFQwMDo0NTowMP88ig==

\06	AC8KAAAlAAAOBKFoZGF0ZXRpbWV4GTIwMjUtMDUtMjBUMTQ6NTU6MTYrMDI6MDDQUw==
\06	AAwLAAACAAAOBL//9T4=

\06	AAsIAAABAAAPBKA5QA==
\06	ACkJAAAfAAAPBL9oZGF0ZXRpbWVzMjk0OC0wMS0wMFQwMDo0NTowMP83Ew==

This is a Base64 packets and I decrypted them based on the SPM protocol specification and UART transport specification:

Get
\06	AAsIAAABAAANBKBXIA==
000b 0800000100000d04 a0 5720
{}
\06	ACkJAAAfAAANBL9oZGF0ZXRpbWVzMjk0OC0wMS0wMFQwMDo0NTowMP88ig==
0029 0900001f00000d04 bf686461746574696d6573323934382d30312d30305430303a34353a3030ff 3c8a
{ "datetime": "2948-01-00T00:45:00"}

Set
\06	AC8KAAAlAAAOBKFoZGF0ZXRpbWV4GTIwMjUtMDUtMjBUMTQ6NTU6MTYrMDI6MDDQUw==
002f 0a00002500000e04 a1686461746574696d657819323032352d30352d32305431343a35353a31362b30323a3030 d053
{"datetime": "2025-05-20T14:55:16+02:00"}
\06	AAwLAAACAAAOBL//9T4=
000c 0b00000200000e04 bfff f53e
{}

Get
\06	AAsIAAABAAAPBKA5QA==
000b 0800000100000f04 a0 3940
{}
\06	ACkJAAAfAAAPBL9oZGF0ZXRpbWVzMjk0OC0wMS0wMFQwMDo0NTowMP83Ew==
0029 0900001f00000f04 bf686461746574696d6573323934382d30312d30305430303a34353a3030ff 3713
{_ "datetime": "2948-01-00T00:45:00"}

As you can see even if I set the proper date-time in the second command with positive response to this command

{"datetime": "2025-05-20T14:55:16+02:00"}

I can't get the proper date-time on the following read. What interesting this output is the same as a first read and doesn't change

{ "datetime": "2948-01-00T00:45:00"}

devzone.nordicsemi.com/.../os_5F00_mgmt_5F00_datetime.zip

RE: nrf52840 RCT2 configuration and usage

Simonr — Fri, 09 May 2025 10:44:31 GMT

Just to check, are you using the os_mgmt_datetime sample in <ncs version>\zephyr\tests\subsys\mgmt\mcumgr\os_mgmt_datetime for this? Where does this strange output print from exactly? Are you sure you have set the date time as reference somewhere in your project so the RTC has a reference point?

Can you show me the full log of your application running so we can get a better understanding of what exactly is returning this value?

Best regards,

Simon

RE: nrf52840 RCT2 configuration and usage

Egor Dolgalev — Thu, 08 May 2025 10:37:32 GMT

I don't use nrfx library directly. I use MCU manager over SMP protocol with the next command https://docs.zephyrproject.org/latest/services/device_mgmt/smp_groups/smp_group_0.html#date-time-command

To send this command over UART I use AuTherm application from this https://docs.zephyrproject.org/latest/services/device_mgmt/mcumgr.html#tools-libraries

RE: nrf52840 RCT2 configuration and usage

narangmayank — Thu, 08 May 2025 10:24:44 GMT

Hi Egor Dolgalev

I'm able to set/get epoch time on nRF52840 via RTC2. Can you share more information on your rtc set/get implementation. Are you directly using nrfx library?

Best Regards,

Mayank