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# 1.25 PORT Polling

This example application demonstrate how to poll the switch input, and indicate the switch status using the LED.

## Description

This application uses the PORT Peripheral library to read the GPIO pin connected to the switch, and drives the GPIO pin connected to the LED to indicate the switch status. LED is turned ON when the switch is pressed and turned OFF when the switch is released.

## Downloading and Building the Application

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/port/port_led_on_off_polling/firmware.

To build the application, refer to the following table and open the project using its IDE.

Project Name | Description
--- | ---
sam_c21n_xpro.X | MPLABX project for SAMC21N Xplained Pro Evaluation Kit

## Setting Up the Hardware

The following table shows the target hardware for the application projects.

Project Name | Description
--- | ---
sam_c21n_xpro.X | SAMC21N Xplained Pro Evaluation Kit

### Setting Up SAMC21N Xplained Pro Evaluation Kit

- Connect the Debug USB port on the board to the computer using a micro USB cable

## Running the Application

1. Build and Program the application using its IDE
2. LED is turned on when the switch is pressed and turned off when the switch is released.

Refer the table below for details of Switch and LED:

Board | Switch Name | LED Name
--- | --- | ---
SAMC21N Xplained Pro Evaluation Kit | SW0 | LED0