Harmony v3 Peripheral Libraries on SAM D5x/E5x: Step 3

Step 3.1: Configure switch button pin to generate an interrupt


In the MCC, select the Pin Settings tab and then scroll down to 122 in the Pin Number column and configure the PORT pin PB31 as an external interrupt pin for switch functionality as shown. The internal pull-up is enabled to avoid false edge detection as there is no external pull-up on the SAM E54 Xplained Pro Evaluation Kit.



Select the Project Graph tab.


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.



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


Step 3.2: Configure LED Pin

Select the MCC Pin Settings tab and then scroll down to 72 in the Pin Number column and configure the PORT pin PC18 as an output pin for LED functionality as shown.


Note: The LED on the SAM E54 Xplained Pro board is active low. Configure the LED in the 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 it to give a name of your liking to the default template main file generated by the MCC.


Note: The name of the default main.c is changed to main_e54.c to indicate that the referred main.c is for the SAM D5x/E5x getting started training module.

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