transfert program using nRF USB port for nRF52840 DK

[swip]

Hello,

Is it possible to transfer a program using the "nRF USB" on the nRF52840 DK (the on next to the 4 push bottoms) ? Until now, I was transferring the code with the other usb port (the one above the button cell) and it was ok. I want to use the other nRF USB port because it is connected directly to the nRF52840 and not through the pca10056.

the classical command : nrfjprog -f NRF52 --reset

results to ERROR: There is no debugger connected to the PC

If I want to design my own PCB, what should I do to transfer my code to the nRF52 chip ?

Thank you very much for the help, Swip

[Sigurd]

The Vtg (aka Vref) is only used to detect a voltage on the target board. This is how the DK knows an external board is present.

From the J-Link manual:

This is the target reference voltage. It is used to check if the target has power, to create the logic-level reference for the input comparators and to control the output logic levels to the target. It is normally fed from Vdd of the target board and must not have a series resistor.