tidstagning/Tidstagning/Relay.cs

using System.IO.Ports;
using System;
using System.Collections.Generic;
using System.Threading;
using System.Diagnostics;
namespace Tidstagning
{
    class Relay
    {
        SerialPort com;
        Timer cooldownTimer;
        Queue<Int32> signals = new Queue<Int32>();
        public Relay(string ComPort = null)
        {
            com = new SerialPort();
            com.PortName = ComPort;
            com.BaudRate = 9600;
            try
            {
                com.Open();
            }
            catch
            {

            }
        }

        private void On()
        {
            Debug.WriteLine("Output on");
            Set(0x00, 0x01);
        }

        private void Off()
        {
            Debug.WriteLine("Output off");
            Set(0x00, 0x00);
        }


        /**
         * Sound the horn for a given time
         * Uses a thread to postpone the off call.
         */
        public void Sound(int time)
        {
            Debug.WriteLine("Requesting horn for: " + time.ToString() + "ms");
            signals.Enqueue(time);
            On();
            if (signals.Count == 1)
            {
                cooldownTimer = new System.Threading.Timer(x =>
            {
                Off();
                signals.Dequeue();
            }, null, signals.Peek(), Timeout.Infinite);
            }
            else
            {
                cooldownTimer.Change(signals.Peek(), Timeout.Infinite);
            }
        }

        private void Set(int output, byte state) {
            byte[] command = {0xff, 0x01, state};
            if (com.IsOpen)
            {
                Debug.WriteLine("COM: " + com.PortName + " Write: 0x" + Convert.ToString(command[2], 16));
                com.Write(command, 0, 3);
            }
        }
        public void Close() {
            if (com.IsOpen)
            {
                Off(); //Make sure the horn is off before closing the com port...
                com.Close();
            }
        }

        public static string[] GetPorts()
        {
            string[] ports; 
            
            if (SerialPort.GetPortNames().Length != 0)
            {
                ports = SerialPort.GetPortNames();
            }
            else
            {
                ports = new string[]{ "N/A" };
            }
            return ports;
        }
    }
}