nRF5340DK VCOM only works with putty

[ubat]

Hey guys,

an issue I was postponing but need to solve for an upcoming management demonstration: I can only connect to the nRF5340DK VCOM with putty.

Using Hterm or the Matlab serial port functionality, which is what I need for the demo, will shut down the Jlink cpu. LED5 will turn off, and the Jlink CDC UART port disappears from the device manager.

I tried DTR/RTS pins on and off, to no avail. This solved the problem here nRF52 DK - USB CDC ACM Example not working with HTerm/Qt - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com) e.g., which is similar I guess.

The Jlink cpu seems to reset upon Hterm or Matlab serial connecting. The nRF5340 is still up and going, as indicated by LEDs signaling new received packets.

Any idea?

Thank you,

Uli

[ubat]

Good morning!

Sorry to reply like this, but there is no reply button on your last answer. It's missing on like 50% of messages.

Øyvind said:

How do you build this project?

I'm using Visual Studio Code and am always using the basic PRX example configuration. So ... clicking on "Build" and "Flash".

Øyvind said:

You should be able to call nrfjprog -r -f NRF53 --log from the command prompt of your windows computer.

Yep, that worked.

Following a log.log of first an erroneous call, and then a succesful one.

 4130.log.log

Thank you!

...edit: and now the "Reply" button appeared.

[Øyvind]

Thank you for providing the log output. I will need some more time to look into issue.

What version of Windows are you working on? Can you please try updating nrfjprog to v10.16.0?