Harmony v3 Peripheral Libraries on SAM L10: Step 3

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® 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.

eic_pin_configuration.png

2

Select the Project Graph tab.

3

Under the Available Components tab, expand 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 as shown below, 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 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.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 MHC.

main_file_name_setup.png

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.



Next Step >

© 2019 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.