1.21 USART Driver Asynchronous - USART Echo

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

Description

This example uses the USART driver in asynchronous mode in Bare-Metal environment to communicate over the console. It receives and echo’s back the characters entered by the user.

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_echo/firmware.

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

Project NameDescription
sam_c21n_xpro.XMPLABX project for SAMC21N Xplained Pro Evaluation Kit

Setting Up the Hardware

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

Project NameDescription
sam_c21n_xpro.XSAMC21N Xplained Pro Evaluation Kit

Setting Up SAMC21N Xplained Pro Evaluation Kit

  • 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 : 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 console as shown below:
  5. LED toggles each time the character is echoed
Refer to the following table for LED name:
BoardLED Name
SAMC21N Xplained Pro Evaluation KitLED0