4.2 Determining the ATSAMC21-XPRO Virtual COM Port Number

The system software consists of a CARS kit PC evaluation utility, which runs on a host PC and communicates with the ATSAMC21-XPRO board via the virtual COM port. Install the USB driver (Windows 10 and later) to support the ATSAMC21-XPRO virtual COM port via a USB connection (see XPRO USB Driver Installation).

Perform the following steps for determining the ATSAMC21-XPRO virtual COM port number:

  1. Connect the micro-USB plug to the USB connector on the ATSAMC21-XPRO board.
  2. Connect the other end of the USB cable to an open USB port on the PC. Open the Windows Device Manager on the PC.
  3. Expand the “Ports (COM & LPT)” menu, then note the COM port assigned to the “EDBG Virtual COM Port”. In this example, COM17 is used while connecting the CARS kit evaluation utility program to the ATSAMC21-XPRO board.
    Figure 4-1. Virtual COM Port Assignment
Note: Always ensure that the adapter cable and the USB cable are unplugged prior to inserting or removing any boards within the system.