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# 1.16 USART Driver Asynchronous - USART Multi Instance

This example echoes the received characters over the two consoles using the USART driver in asynchronous mode.

## Description

This example uses the USART driver in asynchronous mode in both Bare-Metal and RTOS environments to communicate over two consoles. It receives and echoes back the characters entered by the user on the respective console.

## 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/driver/usart/async/usart_multi_instance/firmware.

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

Project Name | Description
--- | ---
sam_d21_xpro.X | MPLABX project for SAM D21 Xplained Pro Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_d21_xpro.X | SAM D21 Xplained Pro Evaluation Kit

### Setting Up SAM D21 Xplained Pro Evaluation Kit

- To run the application, following additional hardware are required
  - mikroBUS Xplained Pro board
  - USB UART click board
- Connect the mikroBUS Xplained Pro board to the EXT1 header
- Install an USB UART click board on to the mikroBUS Xplained Pro board
- Connect the Debug USB port on the board to the computer using a micro USB cable (This will enumerate as a COM port)
- Connect mini USB cable to the USB UART click board (This will enumerate the second port)

## Running the Application

1. Open the Terminal application (Ex.:Tera term) on the computer.
2. Connect to the EDBG/Jlink Virtual COM port and configure the serial settings as follows:
   - Baud : 115200
   - Data : 8 Bits
   - Parity : None
   - Stop : 1 Bit
   - Flow Control : None
3. Build and program the application using its IDE
4. Type a character and observe the output on the two consoles as shown below:
   - If success the character typed echoes back and an LED toggles on each time the character is echoed
   - Console 1
   - Console 2

Refer to the following table for LED name:

Board | LED Name
--- | ---
SAM D21 Xplained Pro Evaluation Kit | LED0