VSCode RTT terminal not working for NRF54L15

RE: VSCode RTT terminal not working for NRF54L15

BertL — Tue, 04 Nov 2025 15:35:23 GMT

Okay thanks! It is not a super big deal, but would be cool if it can be solved. :)

RE: VSCode RTT terminal not working for NRF54L15

Einar Thorsrud — Mon, 03 Nov 2025 15:16:26 GMT

Hi,

I do not have a simple workaround that can be used now, but we have discussed this internally and will work to improve it. I cannot say when it will be done, though.

RE: VSCode RTT terminal not working for NRF54L15

BertL — Mon, 03 Nov 2025 12:21:55 GMT

I'm using nrfConnect 3.1.1 and J-Link V8.66, but if I start rtt logging I still get the error "The selected device NRF54L15_XXAA is unknown to this version of the J-Link software". When I manually select NRF54L15_M33 in the pop-up dialog, logging works correctly, but I have to do this every single time when I start the rtt log. Is there a way to store this setting somewhere?

Flashing works fine, I only have this issue with the RTT log.

RE: VSCode RTT terminal not working for NRF54L15

Einar Thorsrud — Wed, 26 Mar 2025 15:13:50 GMT

Hi,

J-Link v8.22 is not yet supported, and I recommend you use 8.10f for now. With this you can get RTT logging to work also in VS Code, but you have to manually select the device type like this when selecting RTT:

Then you should see the RTT log appear,as shown here with the Bluetooth peripheral UART sample: