using System;
using System.Threading;
using System.IO.Ports;
using System.Text;

using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;

namespace simpleTerm
{
    public class Program
    {
        //COM1 = Console (19200)    COM2 = Elmo (19200)     COM3 = DGH (38400)
        public static SerialPort terminalPort = new SerialPort("COM3", 38400, Parity.None, 8, StopBits.One);
        public static string rxString = "";

        private static AutoResetEvent ev = new AutoResetEvent(false);

        public static void Main()
        {
            Debug.Print("\r\nStarting Program\r\n");

            byte[] txBytes;

            string txString = "";

            terminalPort.ReadTimeout = 2000;
            terminalPort.Open();
            terminalPort.DiscardInBuffer();
            terminalPort.DiscardOutBuffer();
            terminalPort.DataReceived += new SerialDataReceivedEventHandler(terminalPort_DataReceived);

            txString = "$1RD\r";
            txBytes = Encoding.UTF8.GetBytes(txString);
            terminalPort.Write(txBytes, 0, txBytes.Length);

            Debug.Print("Waiting for Signal ...");
            if (ev.WaitOne(1000, false)) //waiting for notification, 1000 mSec timeout
                Debug.Print("RX String = " + rxString);
            else
                Debug.Print("WaitOne timed out");   //Do other error handling stuff

            terminalPort.Close();
        }

        static void terminalPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            char rxChar;

            if (terminalPort.BytesToRead > 0)
            {
                rxChar = (char)terminalPort.ReadByte();
                Debug.Print(rxChar.ToString());
                rxString = rxString + rxChar.ToString();
                Thread.Sleep(10);
                if (rxChar == '\r')
                    ev.Set();
            }
        }
    }
}