1.18 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 both Bare-Metal and RTOS environments 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
sam_9x60_curiosity.XMPLABX project for SAM9X60-Curiosity board
sam_9x60_curiosity_freertos.XMPLABX project for SAM9X60-Curiosity 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 use it to bootstrap the application binaries.

Setting Up the Hardware

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

Project NameDescription
sam_9x60_curiosity.X

sam_9x60_curiosity_freertos.X

SAM9X60-Curiosity board

Setting Up SAM9X60-Curiosity Board

  • Insert USB UART CLICK board into MIKROBUS Connector J8
  • Connect the USB port J1 on board to the computer using a micro USB cable (to power the board)
  • Connect the JTAG J12 on board to the computer using a JTAG based debugger
  • Connect the J11 on board to the computer using a UART-FTDI cable (to enable debug com port)

Running the Application

  1. Open the Terminal application (Ex.:Tera term) on the computer for both ports
  2. Connect the COM port and configure the serial settings as follows (for both ports):
    • 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 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
SAM9X60-Curiosity boardRGB_LED (Green)