Hello, I am a private developer of wireless gaming mice in Japan.
I am thinking of using Nordic's nRF52840 as the MCU, but can this chip be written to only by USB without using an external debugger (such as Jlink) in its factory default state?
If you can't write it, is there a chip somewhere that already has a bootloader written to it?
If possible I do not want to add more SWD pins etc to my board.
I was also wondering if you could tell me if possible how to write to a USB dongle using a custom board.
