RTT Viewer / nrfjprog Issue

[jsample]

If I have the J-Link RTT Viewer open and connected to my PCA10056 (viewing RTT output from an external board connected to P19) and then reprogram the board using nrfjprog this will result in both nrfjprog and RTT Viewer locking up until I unplug and plug back in the PCA10056.  When this happens RTT Viewer prints the following error: "Communication timed out: Requested 12 bytes, received 0 bytes!"  Sometimes this won't happen and it will program just fine and RTT will print out after the boards resets, but the majority of the time it does.  This never used to happen though and I'm not sure what changed to cause it.  If I disconnect the RTT Viewer, program, then reconnect RTT I don't have any problems, but it's annoying to have to do this everytime I want to program the board.

Has anyone one else had this problem?

[Kenneth]

Hi,

Not sure if I have any good idea other than try to download the latest and greatest, e.g.:
https://www.nordicsemi.com/eng/nordic/Products/nRF52-DK/nRF5x-Command-Line-Tools-Win32/51499 

If still not luck try directly:
https://www.segger.com/downloads/jlink/#J-LinkSoftwareAndDocumentationPack 

If still not luck try not to use USB hub or change USB port.

Best regards,
Kenneth

[jsample]

Hi Kenneth,

So at the time I initially posted about this issue i was using version 9.7.3 of the command line tools and I'm pretty sure I had updated the Segger software to a newer version that didn't come with 9.7.3 but I can't remember what version it was.  I uninstalled the command line tools and all of the Segger software and did a clean install of 9.7.3 and everything was back to working normally.

Recently I updated to version 9.8.0 of the command line tools and started having the same issues again.  Uninstalling that and reinstalling 9.7.3 has it working again.  So maybe its a compatibility issue between the command line tools and the newer Segger software?

John

[Håvard]

Hi jsample,

I'm pretty sure a clean install of Command Line Tools 9.8.0 should work fine.

I'm a bit confused about what you actually have installed. (What is working what is not, what was installed when.)

Could you remove all traces of J-Link and other segger software, then install Command Line tools 9.8.0, and let me know how things are working?

When you say "newer Segger software" here, what are you referring to? Did you install J-Link V6.40 after installing the Command Line Tools?

You should be able to use the RTT viewer in J-Link V6.34g (The one used in 9.8.0)

Lastly, is there an important reason for you to use 9.8.0? If the solution remains elusive, you might just want to stick with 9.7.3 for your work environment.

[Jeff4BLE]

Hi John,

It is not possible to run nrfjprog while connected to the RTT viewer. The tools use the same virtual com port and only one can be connected at a time.

In my experience with Windows systems, this has always been the case. I would not think that this would be OS dependent issue. But I wanted to add this just in case.

Best regards,

Jeff

[Turbo J]

There is a workaround for the RTT problem: The Segger GDB server.

It will not only allow you to flash the chip via (arm-none-eabi-)gdb, but you can use any telnet client (I use putty) to connect to the RTT port (localhost:19021 for the first RTT terminal).