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# 1.19 PIO Interrupt

This example application shows how to generate GPIO interrupt on switch press and release, and indicate the switch status using the LED.

## Description

This application uses the PIO Peripheral library to generate callback on switch press and release, and drives the GPIO pin connected to the LED to indicate the switch status. The 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_interrupt.

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

Project Name | Description
--- | ---
sam_a7d65_curiosity.X | MPLABX project for SAMA7D65 Curiosity Board
sam_a7d65_curiosity_pro.X | MPLABX project for SAMA7D65 Curiosity Pro Board

## Setting Up AT91Bootstrap Loader

To load the application binary onto the target device, we need to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to configure, build and run bootstrap loader project and use it to bootstrap the application binaries.

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_a7d65_curiosity.X | SAMA7D65 Curiosity Board
sam_a7d65_curiosity_pro.X | SAMA7D65 Curiosity Pro Board

### Setting Up SAMA7D65 Curiosity Board

Setting up the board:

- Connect the USBA port J3 on the board to the computer using a Type-C USB cable (to power the board)

### Setting Up SAMA7D65 Curiosity Pro Board

Setting up the board:

- Connect the USBA port J1 on the board to the computer using a Type-C USB cable (to power the board)

## Running the Application

1. Build and run 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 details of Switch and LED names:

Board | Switch Name | LED Name
--- | --- | ---
SAMA7D65 Curiosity Board | USER | RGB_LED (Green)
SAMA7D65 Curiosity Pro Board | USER | RGB_LED (Green)

Rev: C