Can not run GPS example code available in nRF Connect SDKv1.0.0 on nRF9160 DK.

[Jagir008]

Hello,

I am working on nRF9160 DK development platform.

For that i Compile & run GPS example, But while debuging that example i find that mcu stucks in CPU Idle function for infinite period of time.

And this is happening while creating a socket.

I Assume that sample example code should not have any issue it should run flawlessly, i think i am missing soemthing while creating an environment / installing SDK & toolchain.

Please let know the solution of this issue.

[Håkon Alseth]

Hi,

 

Is this the example you're running?

https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/v1.0.0/samples/nrf9160/gps/src/main.c

Does the UART print anything? Could you share the logs?

 

Kind regards,

Håkon

[Jagir008]

yes, i am running that example

By debugging i found that mcu goes into cpu_idle state(Infinite loop) while creating socket for enabling GPS.

Debug logs are:

***** Booting Zephyr OS v1.14.99-ncs2 *****
Staring GPS application
Failed to enable GPS

After GPS enable fail printed cpu goes into infinite idle state.

Also i checked to LTE Monitor link to get AT command response But in that also i am not getting any response form device.

 

[Håkon Alseth]

Have you updated to the latest modem fw?

 

Kind regards,

Håkon

[Jagir008]

No,

How to update modem firmware ?

You mean firmware of GPS modem ?

[Håkon Alseth]

Please see this answer from a colleague of mine on how to update the modem:

https://devzone.nordicsemi.com/f/nordic-q-a/49264/unable-to-update-firmware-on-nrf9160/196300#196300

 

Note that v1.0.1 is now available.

 

Kind regards,

Håkon

[Jagir008]

Thanks Hakon,

After updating firmware now i can communicate to Modem in LTE Monitor App & Also GPS Sample Application is working, 

But it is not giving me any of GPS Co-ordinate Data.

NMEA data string is 0,0,0.. for all NMEA formats(GSA,GSV,GGA etc)

From LTE monitor APP i am not able to turn off modem once it is turned ON, Using AT command "AT+CFUN=4".

Where can i get pre-build .hex file for sample applications ?

[Håkon Alseth]

In order to get valid GPS data, you need to be outdoors. You are very unlikely to get a GPS fix inside.

 

Jagir008 said:

Where can i get pre-build .hex file for sample applications ?

 Unfortunately, we do not provide precompiled hex files, but once built; it should be present as a "merged.hex" in your ../my-application/build-folder/zephyr folder. If you haven't setup the toolchain, please see this tutorial on how to get started with NCS:

https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/getting-started-cellular/posts/nrf-connect-sdk-tutorial

Kind regards,

Håkon