Low Power mode using GNSS sample code with nRF9160 DK

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Thu, 18 Jul 2024 07:52:05 GMT

Great! You are welcome. :-)

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Wed, 17 Jul 2024 13:47:20 GMT

Hi Charlie,

It works as expected now. I'm not sure what the issue was but the debug has been disabled and I am getting the same floor current as you.

Thank you for your assistance.

Best Regards,

Wesley

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Wed, 17 Jul 2024 12:38:57 GMT

Sure, here it is. I also attached the firmware gnss.hex built with "west build -p -b nrf9160dk_nrf9160_ns".

devzone.nordicsemi.com/.../gnss.zip

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Wed, 17 Jul 2024 11:15:24 GMT

Hi Charlie,

Thanks for the response. I made the changes but somehow, I am still not getting the desired results.

Would it at all be possible if you could send or provide the GNSS application you built so that I can compile it on my PC and flash it to my nRF9160. That way I should get the same readings as you.

Regards,

Wesley

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Mon, 15 Jul 2024 14:24:18 GMT

Hi Wesley,

I did the following change to the original GNSS sample. Set it to period GNSS modem with default 120s interval and 20s timeout.

You can see the PPK recording shows it reach to floor current when timeout or GNSS fix happen.

chs1@csh1 MINGW64 /c/NCS/v1.9.0/nrf/samples/nrf9160/gnss ((v1.9.0))
$ git diff --cached
diff --git a/samples/nrf9160/gnss/child_image/spm.conf b/samples/nrf9160/gnss/child_image/spm.conf
new file mode 100644
index 000000000..72a7d45fe
--- /dev/null
+++ b/samples/nrf9160/gnss/child_image/spm.conf
@@ -0,0 +1 @@
+CONFIG_SERIAL=n
\ No newline at end of file
diff --git a/samples/nrf9160/gnss/prj.conf b/samples/nrf9160/gnss/prj.conf
index 9a81e3ed0..ce5a385c0 100644
--- a/samples/nrf9160/gnss/prj.conf
+++ b/samples/nrf9160/gnss/prj.conf
@@ -45,3 +45,8 @@ CONFIG_NET_NATIVE=n
 CONFIG_HEAP_MEM_POOL_SIZE=2048
 CONFIG_MAIN_STACK_SIZE=4096
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1536
+
+
+CONFIG_GNSS_SAMPLE_MODE_PERIODIC=y
+CONFIG_GNSS_SAMPLE_PERIODIC_TIMEOUT=20
+CONFIG_SERIAL=n

Best regards,

Charlie

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Mon, 15 Jul 2024 10:04:28 GMT

Please advise on any alternate solutions or methods I could try.

Regards,

Wesley

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Mon, 15 Jul 2024 10:03:28 GMT

Hi Charlie,

Sorry for the late response and I appreciate the feedback you've given. Came back to this project and even though the output is disabled, the text (from the image at the top of this chat) still appears even after changing CONFIG_SERIAL to n. The current still drops to 440uA instead of the intended 2-4uA.

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Fri, 28 Jun 2024 10:48:10 GMT

I add "CONFIG_SERIAL=n" to v1.9.0\nrf\samples\spm\prj.conf then the log output for SPM is disabled.

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Fri, 28 Jun 2024 09:14:27 GMT

No it did not unfortunately

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Fri, 28 Jun 2024 09:12:47 GMT

Hi Wesley,

Sorry, I will borrow a Linux PC to try now. Does it mean your test with prj_minimal.conf not work at all?

Best regards,

Charlie

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Fri, 28 Jun 2024 08:03:52 GMT

Hi Charlie, Any update on this query?

Regards,

Wesley

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Fri, 21 Jun 2024 13:24:15 GMT

Hi Charlie,

That's perfectly fine. I will continue to investigate using the resources you provided.

Regards,

Wesley

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Fri, 21 Jun 2024 13:11:03 GMT

Hi Wesley,

Sorry, I have not worked with SPM for a while and I need to set up the environment for NCS 1.9.0 for this request and will come back to you next week.

You can have quick try by copy content in prj_minimal.conf replace the configuration in prj.conf of sdk-nrf/samples/spm at v1.9-branch · nrfconnect/sdk-nrf (github.com) sample then rebuild the whole project.

The theory behind is introduced in the following pages: (+) Using a custom Secure Partition Manager with your application - Software - nRF Connect SDK guides - Nordic DevZone (nordicsemi.com)

Best regards,

Charlie

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Fri, 21 Jun 2024 12:30:57 GMT

Hi Charlie, thanks for this site. I have tried to implement the same configurations for the GNSS sample code but still had no luck.

I have to work with the GNSS sample and with SDK 1.9.0 due to this being a product for the NETSTAR customer. Your responses are appreciated.

The nRF9160 with the GNSS sample code consumes 36mA and then drops to around 440uA as expected. If I am able to disable all debug in the serial terminal, then this should drop the current to 2uA-4uA which is my intended goal.

Regards,

Wesley

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Fri, 21 Jun 2024 11:52:32 GMT

Ok, you can refer to the spm.conf configuration in SLM sample. It disables the log output from SPM.

sdk-nrf/applications/serial_lte_modem/child_image/spm.conf at v1.9-branch · nrfconnect/sdk-nrf (github.com)

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Fri, 21 Jun 2024 11:33:26 GMT

Thank you for the timely response. For my investigation, I have to work with 1.9.0

Regards,

Wesley

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Fri, 21 Jun 2024 11:30:28 GMT

Hi Wesley,

If you just start your development, I strongly suggest you switch to the latest NCS version(NCS 2.6.1 now and NCS 2.7.0 will be released next week)+MFW 1.3.6.

NCS 1.x and 2.x has a big change on security management, you would not have this displaying when you switch from SPM to TF-M (introduced since NCS 2.0.0).

Migration notes for nRF Connect SDK v2.0.0 (nordicsemi.com)

Running applications with Trusted Firmware-M (nordicsemi.com)

Trusted Firmware-M Documentation (nordicsemi.com)

Let me know if you still have to work with NCS 1.9.0 or not.

Best regards,

Charlie

RE: Low Power mode using GNSS sample code with nRF9160 DK

Wesley14 — Fri, 21 Jun 2024 09:35:19 GMT

Thank you, Charlie, for the response. The blog definitely helped. One more concern I have is with regards to the "Booting Zephyr OS" message that appears in the serial terminal. Below is an image displaying the issue.

My question is, how do I stop this message from displaying?

I am using SDK 1.9.0.

I have changed the following as well, but the message still appears:

CONFIG_SERIAL=n

CONFIG_UART_SERIAL=n

CONFIG_SECURE_BOOT_DEBUG=n

CONFIG_LOG=n

Thanks

RE: Low Power mode using GNSS sample code with nRF9160 DK

Charlie — Fri, 21 Jun 2024 08:09:33 GMT

Hi Wesley,

Thanks for checking with us this request. You can start with the following blog, it basically covers your two questions.

(78) Up to 4x battery life: The benefits of assisted GPS in asset tracking - Blogs - Nordic Blog - Nordic DevZone (nordicsemi.com)

Let me know if you have more questions.

Best regards,

Charlie