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# 1.13 EVSYS Trigger

This example application demonstrates how to use the EVSYS Peripheral library to setup autonomous, low-latency and configurable communication between peripherals.

## Description

This example application shows how to use the EVSYS Peripheral library to route the events generated by the switch to toggle an LED without CPU intervention.

## 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/evsys/evsys_trigger/firmware.

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

Project Name | Description
--- | ---
sam_l21_xpro.X | MPLABX project for SAM L21 Xplained Pro Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_l21_xpro.X | SAM L21 Xplained Pro Evaluation Kit

### Setting Up SAM L21 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 toggles on every switch press

Following table provides the Switch and LED names:

Board | Switch Name | LED Name
--- | --- | ---
SAM L21 Xplained Pro Evaluation Kit | SW0 | LED0