I am trying to achieve the following objective
I want to upload the hex file of my application code which blinks leds after 1 second without using th SWD interface ,instead to program the nrf52840 ,i want to use USB Drag n Drop method(Just like what we do to upload bootloader)
Do i need to upload another bootloader to achieve this functionality?
I am using SDK15.0 with nrf52840 PDK.
What is the purpose of nrfUSB port on the PDK (besides the IFRESET/BOOT button)?
The nRF52840 DK will enumerate as JLINK when you plug it into your computer from the USB port on the left side of the board. You will see the following four files on the device: MBED.HTM, README.TXT…
I can only answer your last question; (One of) the purpose(s) of the nrfUSB port is to disconnect the interface MCU and some other hardware from the nrf52840 to make accurate power testing possible.