1.16 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
pic32mx470_curiosity.XMPLABX project for Curiosity PIC32MX470 Development Board
pic32mx_xlp_sk.XMPLABX project for PIC32MX274 XLP Starter Kit

Setting Up the Hardware

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

Project NameDescription
pic32mx470_curiosity.XCuriosity PIC32MX470 Development Board
pic32mx_xlp_sk.XPIC32MX274 XLP Starter Kit

Setting Up Curiosity PIC32MX470 Development Board

  • To run the demo, the following additional hardware are required:
  • Connect mini USB cable to the ‘Debug USB’ connector(J3) on the board to the computer
  • Install the USB UART click board on to the mikroBUS socket J5 of Curiosity PIC32MX470 Development Board
  • Connect mini USB cable to the USB UART click board. This will enumerate the USB to UART port
    Note: Ensure that the series resistors on the mikroBUS headers are of value 0 Ohms.

Setting Up PIC32MX274 XLP Starter Kit

  • To run the demo, the following additional hardware are required:
  • Connect micro USB cable to the ‘Debug USB’ connector(J9) on the board to the computer
  • Install the USB UART click board on to the mikroBUS socket J5 of PIC32MX274 XLP Starter Kit
  • Connect mini USB cable to the USB UART click board. This will enumerate the USB to UART port

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
Curiosity PIC32MX470 Development BoardLED1
PIC32MX274 XLP Starter KitLED1 (RED)