I want to build my own board with the ATSAMD21J18A microcontroller but I am a begginer and I have some questions related to programming.
The XPLAINED PRO BOARD has their own circuit programmer to programm the main microcontroller through USB. To do the same on my board I know I need the Atmel ICE and access to the SWD pins of the microcontroller.
However I would like to kown if it is possible program the micro through USB with USB_DP/DM pins.
Any comments or suggestions are appreciated.