Skip to content

Latest commit

 

History

History

Receive_Control_Commands

README.md

MCHP

Receive Control Commands

This project shows how to use the Universal Synchronous and Asynchronous Receiver and Transmitter (USART) to implement a command line interface. This way, the microcontroller can receive control commands via the USART. It is convenient to use the line terminator \r\n as a command delimiter, so for this use case the USART will read full lines. The application can decode:

  • 'ON' command and will turn on an LED and reply with 'OK, LED ON.\r\n'
  • 'OFF' command and will turn off an LED and reply with 'OK, LED OFF.\r\n'
  • for any other command, it will reply with 'Type ON/OFF to control the LED.\r\n'

Related Documentation

More details and code examples on the ATMEGA4809 can be found at the following links:

Software Used

Hardware Used

Setup

The ATMEGA4809 Xplained Pro Development Board is used as test platform.


The following configurations must be made for this project:

  • Clock frequency 3.33 MHz

USART0 configuration:

  • 9600 baud rate
  • 8 data bits
  • no parity bit
  • 1 stop bit
  • RX and TX pins enabled (PC0 and PC1)
Pin Configuration
PC0 Digital output
PC1 Digital input
PB5 (LED) Digital output

Operation

  1. Connect the board to the PC.

  2. Open the atmega4809-getting-started-with-usart-studio.atsln solution in Microchip Studio.

  3. Set the Receive_Control_Commands project as Start Up project. Right click on the project in the Solution Explorer tab and click Set as StartUp Project.


  1. Build the Receive_Control_Commands project: right click on the atmega4809-getting-started-with-usart-studio solution and select Build Solution.


  1. Select the ATMEGA4809 Xplained Pro in the Connected Hardware Tool section of the project settings:
  • Right click on the project and click Properties;
  • Click on the Tool tab.
  • Select the ATMEGA4809 Xplained Pro (click on the SN) in the Selected debugger/programmer section, and save (CTRL + S):


  1. Program the project to the board: click on the Debug tab and click Start Without Debugging.


Demo

Note: open the terminal before programming the device. The help command "Type ON/OFF to control the LED." will be received.


In this demo, commands are sent via serial communication and the confirm messages are received in a terminal.
Right after initialization, the board sends the "Type ON/OFF to control the LED." message. Then, it follows the behavior described in the description of this README.

Summary

This project shows how to use the USART peripheral to implement a command line interface.