Button Interrupt Events

This sample illustrates wiring up an event to fire when interrupts come in on an InterruptPort when wired up to a circuit that sends intermittent signals such as a button.

Code

using System;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;

namespace ButtonInterruptEvents
{
    public class Program
    {
        // An output port allows you to write (send a signal) to a pin
        static OutputPort _led = new OutputPort(Pins.ONBOARD_LED, false);

        // An interrupt port raises events when its value changes. in this case, 
        // we use it to create an event when the button is clicked.
        // We set the Interrupt mode to raise an event on both edges of the signal;
        // both down, and up.
        static InterruptPort _button = new InterruptPort((Cpu.Pin)0x15, false, 
            Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeBoth );
        
        public static void Main()
        {
            // turn the LED off initially
            _led.Write(false);

            // wire up the interrupt to our event handler
            _button.OnInterrupt += handleButtonClick;

            // run forever
            while (true)
            {
                
            }
        }

        static void handleButtonClick (uint port, uint data, DateTime time)
        {
            // will be 1 when pressed (raised high), and 0, when unpressed
            Debug.Print ("Data: " + data.ToString ());
            _led.Write (data == 1);
        }
    }
}

Netduino Samples Github Repository

Full source code for all of the samples can be found in the Netduino Samples repository on Github.