MPLAB® Harmony v3 Peripheral Libraries on SAM L10: Step 3

Last modified by Microchip on 2023/11/09 09:08

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

In the MPLAB® Harmony Configurator (MHC), select the Pin Settings tab and then scroll down to 25 in the Pin Number column and configure the PORT pin PA27 as an external interrupt pin for switch functionality as shown below. 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.

Pin Settings tab

Select the Project Graph tab.

Under the Available Components tab, expand Peripheral > EIC.

Select and double click on EIC to add the EIC module to the project.

add eic peripheral

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

Configuration Options pane

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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

Select the MHC 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 as shown below.

led pin configuration

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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".

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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 the MHC.

main file name setup

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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