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# 1.42 USART Blocking

This example shows how to use the USART peripheral to transfer a block of data in a blocking manner.

## Description

This example shows the read and write operation over a USART in a blocking manner. The CPU polls the peripheral register continuously to manage the transfer. It receives a line of 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/usart/usart_echo_blocking/firmware.

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

Project Name | Description
--- | ---
sam_e70_xult.X | MPLABX project for SAM E70 Xplained Ultra Evaluation Kit
sam_v71_xult.X | MPLABX project for SAM V71 Xplained Ultra Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_e70_xult.X | SAM E70 Xplained Ultra Evaluation Kit
sam_v71_xult.X | SAM V71 Xplained Ultra Evaluation Kit

### Setting Up SAM E70 Xplained Ultra Evaluation Kit

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

### Setting Up SAM V71 Xplained Ultra 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. The console displays the following message
5. Type a line of characters and press the Enter key
   Note: Number of characters entered before pressing enter key should be less than 256.
6. Entered line will be echoed back and the LED is toggled
7. The following table provides the LED names:

   Board | LED Name
   --- | ---
   SAM E70 Xplained Ultra Evaluation Kit | LED1
   SAM V71 Xplained Ultra Evaluation Kit | LED0