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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_rh71_ek.X | MPLABX project for SAM RH71 Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_rh71_ek.X | SAM RH71 Evaluation Kit

### Setting Up SAM RH71 Evaluation Kit

- Connect the debugger probe to J33

## 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

Following table provides the Switch and LED names:

Board | Switch Name | LED Name
--- | --- | ---
SAM RH71 Evaluation Kit | PB0 | LED0