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# 1.15 PIO Polling

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

## Description

This application uses the PIO Peripheral library to read GPIO pin connected to the switch, and drives the GPIO pin connected to the LED to indicate 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/pio/pio_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_e70_xult.X | MPLABX project for SAM E70 Xplained Ultra Evaluation Kit
sam_v71_xult.X | MPLABX project for SAM V71 Xplained Ultra Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_e70_xult.X | SAM E70 Xplained Ultra Evaluation Kit
sam_v71_xult.X | SAM V71 Xplained Ultra Evaluation Kit

### Setting Up SAM E70 Xplained Ultra Evaluation Kit

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

### Setting Up SAM V71 Xplained Ultra 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 their respective IDEs
2. LED is turned ON when the switch is pressed and turned OFF when the switch is released

Refer to the following table for Switch and LED names:

Board | Switch Name | LED Name
--- | --- | ---
SAM E70 Xplained Ultra Evaluation Kit | SW0 | LED1
SAM V71 Xplained Ultra Evaluation Kit | SW0 | LED0