// Data Link analyzer for .NET Micro Framework
// Written by: Pavel Bansky
// http://bansky.net

// This code was written to analyze traffic between
// PICAXE 18X micro controller and DS18B20 thermometer

using System;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using EmbeddedFusion.SPOT.Hardware;
using System.Threading;

namespace LinkAnalyzer
{
    public class Program
    {
        public static void Main()
        {
            LinkListener linkListener = new LinkListener();
            
            // Power supply port for analyzed devices
            OutputPort powerSupply = new OutputPort(Meridian.Pins.GPIO13, false);

            // Stabilizing wait
            Thread.Sleep(2000);

            // Start listening to communication
            linkListener.Start();

            // Power up the PICAXE device
            powerSupply.Write(true);

            // Wait while sampling
            while (linkListener.Running)
            {
                
            }

            // Print the sample results
            linkListener.Print();
        }
    }

    public class LinkListener
    {
        InterruptPort listener;
        DataRecord[] recordArray = new DataRecord[255];
        int dataIndex = 0;

        // Identifies that analyzer is running
        public bool Running = false;

        // Start analyzer
        public void Start()
        {                        
            dataIndex = 0;
            Running = true;
            
            // Interrupt port where the analyzer listens
            listener = new InterruptPort(Meridian.Pins.GPIO14, false, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeBoth);
            listener.OnInterrupt += new GPIOInterruptEventHandler(listener_OnInterrupt);
        }

        // Stop analyzer
        public void Stop()
        {
            Running = false;
            listener.OnInterrupt -= new GPIOInterruptEventHandler(listener_OnInterrupt);
            //listener.Dispose();
        }

        // Print results
        public void Print()
        {        
            for (int i = 0; i < dataIndex; i++)
            {
                // Determines how long the status was present on the line
                long divval = (recordArray[i+1].Time - recordArray[i].Time) / 10;
                Debug.Print(i.ToString()+"| "+recordArray[i].State.ToString() + ", " + divval.ToString());
            }
        }

        // Catch all changes on the line
        void listener_OnInterrupt(Cpu.Pin port, bool state, TimeSpan time)
        {
            DataRecord d = new DataRecord();
            d.State = state;
            d.Time = time.Ticks;

            // Add data into recordArray
            recordArray[dataIndex++] = d;

            // Stop after 110 samples !! Change for your needs !!
            if (dataIndex > 110)
                Stop();
        }
    }

    // Struct for records
    public struct DataRecord
    {
        public bool State;
        public long Time;
    }
}