1.23 RTT Alarm Interrupt

This example application shows how to use the RTT to generate alarm interrupt.

Description

This example application shows how to configure alarm interrupt using the RTT Peripheral Library. The application sets up an alarm to be generated after 10 seconds. The application displays a message on the alarm trigger.

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/rtt/rtt_alarm/firmware.

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

Project NameDescription
sam_a7g5_ek.XMPLABX project for SAMA7G54 Evaluation Kit

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
sam_a7g5_ek.XSAMA7G54 Evaluation Kit

Setting Up SAMA7G5 Evaluation Kit

SETTING UP THE BOARD
  • Connect a 5V power supply to the board. This can be either of the following:
    • A USB cable connected between “USBA” (J7) connector on the board and USB host port on PC
    • A 5V DC adapter connected to “5V DC IN” (J1) connector on board
  • Connect the Debug USB port (J24) 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/Jlink 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 RTT value and gets updated every second. Once the alarm value 10 is reached, it print the alarm message and turns on the LED.
Refer to the following table for LED name:
BoardLED Name
SAMA7G54 Evaluation KitRGB_LED (Blue)