1.22 RTC Alarm Interrupt

This example application shows how to setup system time and configure alarm using the RTC Peripheral Library. The application sets up an alarm to be generated after 20 seconds of the configured system time. The application displays a message on the alarm trigger.

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/rtc/rtc_alarm.

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

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.

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

1. Open the Terminal application (Ex.:Tera term) on the computer
2. Connect to the 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 the current time and the alarm time (System time starts at 12:00:00 and gets updated every second)

   

5. Once the alarm time is reached, it print the alarm message and turns on the LED (System time keeps updating)