Harmony v3 Peripheral Libraries on SAM L10: Step 3

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Step 3.1: Configure switch button pin with the External Interrupt Controller (EIC) to generate an interrupt

In this step, the switch button will be configured as per the below USER_BUTTON design schematic on SAM L10 Xplained Ultra Evaluation Kit.

user_button_schematic.png

1

In the MPLAB® Code Configurator (MCC), select the Pin Settings tab and then scroll down to 25 in the Pin Number column. Configure the PORT pin PA27 as an external interrupt pin for switch functionality. Internal pull-up is enabled to avoid false edge detection as there is no external pull-up on the SAM L10 Xplained Pro Evaluation Kit.

eic_pin_configuration.png

2

Select the Project Graph tab.

3

Under the Device Resources tab, expand Harmony > Peripheral > 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, and enable filter functionality to avoid electrical noise on switch pin.

eic_configuration_setup.png

Step 3.2: Configure LED Pin

In this step, the user LED will be configured as per below USER_LED design schematic on SAM L10 Xplained Ultra Evaluation Kit.

user_led_schematic.png

1

Select the Pin Settings tab and then scroll down to 8 in the Pin Number column and configure the PORT pin PA07 as an output pin for LED functionality.

led_pin_configuration.png
​

The LED on the SAM L10 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

1

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 the MCC.

main_file_name_setup.png
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The name of the default main.c is changed to main_l10.c to indicate that the referred main.c is for the SAM L10 getting started training module.



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