RTC alarm interrupt

This example application shows how to use the RTC to configure the time and generate the alarm.

Description

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.

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/rtc/rtc_alarm/firmware .

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

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.

Setting up SAM9X75-EB Evaluation Board

Setting up the board

• Connect the DBGU0 J34 on board to the computer using a UART-FTDI cable (to enable debug com port)
• Connect the USB port J28 on board to the computer using a micro USB cable (to power the board)

Running the Application

1. Build the application using its IDE
2. Open the Terminal application (Ex.:Tera term) on the computer.
3. Connect to the (USB to Serial) COM port and configure the serial settings as follows:
   • Baud : 115200
   • Data : 8 Bits
   • Parity : None
   • Stop : 1 Bit
   • Flow Control : None

4. The console displays the current time and the alarm time (System time starts at 10 seconds to midnight and gets updated every one second)

   

5. Once the system Time reaches 10 seconds after midnight , the following message is displayed and RGB_LED toggles between green and blue color

   

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