1.24 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 Bare-Metal environment 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 NameDescription
sama5d29_curiosity.XMPLABX project for SAMA5D29 Curiosity Development Board

Setting Up AT91Bootstrap loader

To load the application binary onto the target device, we need to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to configure, build and run bootstrap loader project and use it to bootstrap the application binaries.

Setting Up the Hardware

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

Project NameDescription
sama5d29_curiosity.XSAMA5D29 Curiosity Development Board

Setting Up SAMA5D29 Curiosity Development Board

ADDTIONAL HARDWARE REQUIRED
SETTING UP THE BOARD

  • Connect a FTDI cable from UART Debug (J28) port to computer.

  • Connect USB UART CLICK board to the curiosity board using the pin connections described below:

    SAM A5D2 curiosity board PinsUSB UART Click board Pins
    PIN 5, J8 connectorRX
    PIN 4, J8 connectorTX
    PIN 7, J19 connector3.3V
    PIN 1, J8 connectorGND

  • Connect the USB_A port on board to the computer using a USB-C type cable

Running the Application

  1. Build and program the application using its IDE
  2. Open the Terminal application (Ex.:Tera term) on the computer for both ports
  3. 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
  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:
BoardLED Name
SAMA5D29 Curiosity Development BoardRGB_LED (Green)