View defmt_rtt output in J-Link viewer

[pnchatterji]

Hello,
I am using defmt_rtt in an Embassy application. In order to view output messages using probe_rs, I was forced to change the jlink usb driver. I had previously attempted to view the output on J-Link viewer, but I was getting junk, even after setting encoding to raw. However, now my J-link viewer is unusable. Probably I would need to reinstall it. Is there any way to see the defmt_rtt output in j-link viewer, thus avoiding having to replace the USB driver? I need the j-link viewer for non-rust embedded applications, so I can't keep installing and reinstalling the USB drivers.

thanks
regards
pnc

[jonathanpallant]

I think you would need to talk to SEGGER about adding support for the defmt protocol to their J-Link tool, either directly or by piping the RTT byte stream through the defmt-print binary.

[jonathanpallant]

SEGGER now have official Rust support in the Ozone debugger so it's definitely worth asking them about this.