Hello all,
I am currently trying to test out the programming functionality of the SEGGER JLink Plus on the NRF52840-DK. I am trying to do this in preparation for programming our custom boards, so using the OB debugger is not the point. Unfortunately, I cannot seem to get anything connected to the DK via the Debug In port, which it seems is how I am supposed to this.
So far, I have been able to use various SEGGER tools to verify that the Host-JLink connection is working. However, I have not been able to get any program to detect the DK. I have tried the JLink Commander and I have tried nrfjprog, and neither detect any target device.
I have tried a few different configurations with the power switches and which USB is connected (J2 or J3), and I again, no luck. I have used a multi meter to check that the voltage is right around 3V between the VTref and GND pins on the Debug In connector.
My initial question, is what is the proper procedure to be able to program the NRF52840 via an external debugger? I have combed through a few articles and infocenter pages, but I can't seem to find what I'm looking for.
Thanks to anyone who can provide me information.
