GPSMON and nRF52840 Connectivity Bridge

RE: GPSMON and nRF52840 Connectivity Bridge

user100109 — Thu, 09 Jun 2022 08:10:20 GMT

[quote user="John_Turner"]As far as I can tell everything on the Nordic side is working as expected. I'm going to assume that the issue is with the GPSMON code so I think the case can be closed.[/quote]

Thanks a lot for your feedback, John!

My personal recommendation would be to investigate the GPSMON side as well. But feel free to create a new ticket if that does not give the desired results :-)

Cheers,

Markus

RE: GPSMON and nRF52840 Connectivity Bridge

user56037 — Wed, 08 Jun 2022 21:07:53 GMT

Hi Markus,

The connectivity bridge was built from SDK version 1.71 using the Segger IDE. I've tried to rebuild it with a later version but I get python and script errors when I try to import the project. Hopefully version 2.0 of the SDK and VS Code will be less problematic.

As far as I can tell everything on the Nordic side is working as expected. I'm going to assume that the issue is with the GPSMON code so I think the case can be closed.

RE: GPSMON and nRF52840 Connectivity Bridge

user100109 — Wed, 08 Jun 2022 08:56:10 GMT

Hello John,

[quote user="John_Turner"]Do both the nRF9160Dk and the connectivity bridge software both use hardware flow control?[/quote]

Yes, they do. See:

Thingy:91 pin assignment
nRF9160 DK pin assignment

[quote user="John_Turner"]However, when I run the application on the nRF9160DK the serial output is recognized by GPSMON but if I run it on the custom hardware, with the connectivity bridge, it is not. Since the nRF9160DK uses a different serial to USB converter then the Thingy91 my assumption is that this is where the issue lies.[/quote]

The nRF9160 DK has the Segger OB debugger available through the USB, which the Thingy:91 hasn’t. Hence, Thingy:91 can only be programmed in MCUboot mode via USB. Unfortunately, it is hard to tell what the reason could be here. I assume you are using the latest revision of the Connectivity bridge on your nRF52840?

Regards,

Markus

RE: GPSMON and nRF52840 Connectivity Bridge

user56037 — Tue, 07 Jun 2022 19:45:58 GMT

Hello Markus,

As clarification, I am running the GNSS application on the nRF9160 in two different scenarios. The first is on an nRF9160DK and in the second on custom hardware that mimics the Thingy91 hardware, e.g. using the nRF52840 to provide the serial interface over USB. In both cases I can view the NMEA sentences and the information is correct. However, when I run the application on the nRF9160DK the serial output is recognized by GPSMON but if I run it on the custom hardware, with the connectivity bridge, it is not. Since the nRF9160DK uses a different serial to USB converter then the Thingy91 my assumption is that this is where the issue lies.

One suggestion is that there is a difference in the implementation of hardware flow control between the two platforms. Do both the nRF9160Dk and the connectivity bridge software both use hardware flow control?

RE: GPSMON and nRF52840 Connectivity Bridge

user100109 — Tue, 07 Jun 2022 11:02:07 GMT

Hello John,

[quote user=""]I'm looking for any ideas on why the connectivity bridge software doesn't work in this scenario?[/quote]

The Connectivity bridge is designed to act as an USB composite device for the Thingy:91. The nRF52840 does not support GNSS functionality on its own.

Regards,

Markus