Step 3.1: Configure switch button pin with EIC
In the Plugins, select the Pin Settings tab and then scroll down to 67 in the Pin Number column and configure the PORT pin PB19 as an external interrupt pin for switch functionality as shown below. The internal pull-up is enabled to avoid false edge detection as there is no external pull-up on the SAMC21N Xplained Pro Evaluation Kit.
Select the Project Graph tab.
Step 3.2: Configure LED Pin
Select the MPLAB® Code Configurator (MCC) Pin Settings tab and then scroll down to 21 in the Pin Number column and configure the PORT pin PC05 as an output pin for LED functionality as shown below.
Note: The LED on the SAMC21N Xplained Pro board is active low. Configure the LED in default OFF state by configuring the latch value to logic High.
Step 3.3: Rename the default main file
Under the Project Graph tab, click on System and configure as below to give a name of your liking to the default template main file generated by MCC.
Note: The name of the default main.c is changed to main_c21n.c to indicate that the referred main.c is for the SAM C2x getting started training module.