Harmony v3 Peripheral Libraries on SAMC2x: Step 3

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Step 3.1: Configure switch button pin with EIC

1

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.

eic_pin_configuration.png

2

Select the Project Graph tab.

3

Add the External Interrupt Controller (EIC) to the project.
Under the left side tab, Resource Management (MCC), go to Device Resources and expand Libraries > Harmony > Peripherals > EIC.
Select and double-click on EIC to add the EIC module to the project.

eic_peripheral_adding.png

4

Configure the EIC block to generate an interrupt every time the user presses the switch SW0 as shown below, and enable debounce functionality to avoid debouncing on switch pin.

eic_configuration_setup.png

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.

led_pin_configuration.png
​

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.

main_file_name_setup.png
​

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.



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