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# 1.4 SERCOM USART Interrupt

This example application demonstrates how to use the SERCOM peripheral in USART mode to transfer data in a non-blocking manner.

## Description

This example shows the read and write operation over a UART in a non-blocking manner. The peripheral interrupt is used to manage the transfer. It receives 10 characters from the terminal window and echoes them back.

## 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/sercom/usart/usart_echo_interrupt/firmware.

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

Project Name | Description
--- | ---
sam_d10_xmini.X | MPLABX project for SAM D10 Xplained Mini

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_d10_xmini.X | SAM D10 Xplained Mini

### Setting Up SAM D10 Xplained Mini

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

## Running the Application

1. Open the Terminal application (Ex.:Tera term) on the computer
2. Connect to the EDBG Virtual COM port and configure the serial settings as follows:
   - Baud : 9600
   - Data : 8 Bits
   - Parity : None
   - Stop : 1 Bit
   - Flow Control : None
3. Build and Program the application using its IDE
4. The console displays the following message
5. Type 10 characters in the console
6. Entered characters will be echoed back and the LED is toggled

The following table provides the LED name:

Board | LED Name
--- | ---
SAM D10 Xplained Mini | LED0