nRF54L15 RTT

[garrettb]

Hi

When running a project on the nRF54L15 using nRF Connect in VS Code, I often cannot connect to RTT.
I select RTT in nRF Connect, but no output appears.
If I retry multiple times (e.g., re-flashing the device, occasionally resetting, or restarting VS Code), I can eventually get RTT to connect. Once it connects successfully, it tends to work reliably for a while.
When RTT fails to connect, each attempt triggers a pop-up from SEGGER J-Link (v8.66) asking me to select the Manufacturer and Device. This adds extra delay each time.
The behavior is inconsistent: sometimes RTT works immediately, other times it requires several attempts before it stabilizes.

Could there be a setting in my project that is missing, or is this known behaviour?

Thanks

[Priyanka]

Hi Garrett,

Is it a custom board with the nRF54L15 SoC or the nRF54L15-DK that you are working with?

-Priyanka

[garrettb]

Hi Priyanka, yes it is a custom board, so perhaps there is something missing from my prj.conf

[Priyanka]

Hi Garett,

Could you take a look at this similar issue and check whether it's the same? The issue might be because the nRF54L15 is comparatively new to the JLink.

-Priyanka