nRF Terminal extension in VS Code fails to connect in RTT mode

[AndyM]

I installed the nRF Connect extension pack which also contains the nRF Terminal extension but I cannot make it work in VS Code

In the command pallette I select  nRF Terminal:Start Terminal, specify RTT as a connect method and hit Enter when prompted for device name, serial number and memory address.

There is a message "nRF terminal trying to connect" at the bottom of the VS Code window but it  never succeeds. I verified that the board is connected with JLink , the code is running and I can see output is printed in the JLink RTT Viewer 

Tried to send nRF:clear  but that did not help

Any ideas how to fix?

Thank you

Andy

[Susheel Nuguru]

can you set the memory address to auto and see if that works?

I am not able to reproduce that with latest VSC and latest nRF terminal extension. probably there is some other emulator listening to your COM/RTT port?

[AndyM]

No other emulators are running. Memory address selection is set to auto.

[Susheel Nuguru]

which OS are you using? Windows/Linux?
Can you give me your project zipped so that I can do a quick smoke test on my desk? 

[AndyM]

I'm on Windows and  have a custom board.  Connection to the board via JLink works fine with Segger Embedded Studio and standalone ( Commander, RTT viewer ) but does not work in VScode. You don't need a project - nRF Terminal extension keeps "trying to connect" but never succeeds.

[Susheel Nuguru]

I have tried to test this with multiple DKs and am not able to reproduce it. Unable to find any communication within support where this is being discussed. So I am assuming this is something to do with the custom board. The nRF Terminal uses JLink in the background, so I am a bit confused as to why this is works with JLink on command prompt and not with this process. I will try to ask the VCS team to know if they have seen this before and for any directions to proceed from here.

[Susheel Nuguru]

What is the device name you are giving? for me for nRf52840 DK, I give NRF52840_XXAA and it works fine after giving the serial number. 

[AndyM]

I tried that and also tried leaving all fields empty - no luck. As for serial number - no idea where to find it - this is a custom board - so I typed 1234 - made no difference. 
Confirming, the board communicates just fine with JLink RTT viewer and Segger Embedded Studio. I'm on Windows 10. 

[spring.liu]

how to configuration  the "device"  "serial number" "memory address"

"NFR52840_XXAA"  what should i put in "serial number" "memory address"?