Hi folks, Would like to know from all you guys what you think about my Serial Wrapper class. Had be a while I've beem working with serial port but never shared the code what somekind make closed to my very own vision.

Would like to know if it's a good/bad approach, if the interface is enough and what more you see on it.

I know that Stackoverflow is for question but at the same time there's a lot of very good skilled people here and share code and opinion can also bennefit everybody, it's why I decided to post it anyway.

thanks!

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

namespace Driver
{
    class SerialSingleton
    {
        // The singleton instance reference
        private static SerialSingleton instance = null;

        // System's serial port interface
        private SerialPort serial;

        // Current com port identifier
        private string comPort = null;

        // Configuration parameters
        private int confBaudRate;
        private int confDataBits;
        private StopBits confStopBits;
        private Parity confParityControl;

        ASCIIEncoding encoding = new ASCIIEncoding();

// ==================================================================================
// Constructors

        public static SerialSingleton getInstance()
        {
            if (instance == null)
            {
                instance = new SerialSingleton();
            }
            return instance;
        }

        private SerialSingleton()
        {
            serial = new SerialPort();
        }

// ===================================================================================
// Setup Methods

        public string ComPort
        {
            get { return comPort; }
            set {
                if (value == null)
                {
                    throw new SerialException("Serial port name canot be null.");
                }

                if (nameIsComm(value))
                {
                    close();
                    comPort = value;
                }
                else
                {
                    throw new SerialException("Serial Port '" + value + "' is not a valid com port.");
                }
            }

        }

        public void setSerial(string baudRate, int dataBits, StopBits stopBits, Parity parityControl)
        {
            if (baudRate == null)
            {
                throw new SerialException("Baud rate cannot be null");
            }

            string[] baudRateRef = { "300", "600", "1200", "1800", "2400", "3600", "4800", "7200", "9600", "14400", "19200", "28800", "38400", "57600", "115200" };

            int confBaudRate;
            if (findString(baudRateRef, baudRate) != -1)
            {
                confBaudRate = System.Convert.ToInt32(baudRate);
            }
            else
            {
                throw new SerialException("Baurate parameter invalid.");
            }

            int confDataBits;
            switch (dataBits)
            {
                case 5:
                    confDataBits = 5;
                    break;
                case 6:
                    confDataBits = 6;
                    break;
                case 7:
                    confDataBits = 7;
                    break;
                case 8:
                    confDataBits = 8;
                    break;
                default:
                    throw new SerialException("Databits parameter invalid");
            }

            if (stopBits == StopBits.None)
            {
                throw new SerialException("StopBits parameter cannot be NONE");
            }

            this.confBaudRate = confBaudRate;
            this.confDataBits = confDataBits;
            this.confStopBits = stopBits;
            this.confParityControl = parityControl;
        }

// ==================================================================================

        public string[] PortList
        {
            get {
                return SerialPort.GetPortNames();
            }
        }

        public int PortCount
        {
            get { return SerialPort.GetPortNames().Length; }
        }

// ==================================================================================
// Open/Close Methods


        public void open()
        {
            open(comPort);
        }

        private void open(string comPort) 
        {
            if (isOpen())
            {
                throw new SerialException("Serial Port is Already open");
            }
            else
            {
                if (comPort == null)
                {
                    throw new SerialException("Serial Port not defined. Cannot open");
                }


                bool found = false;
                if (nameIsComm(comPort))
                {
                    string portId;
                    string[] portList = SerialPort.GetPortNames();
                    for (int i = 0; i < portList.Length; i++)
                    {
                        portId = (portList[i]);
                        if (portId.Equals(comPort))
                        {
                            found = true;
                            break;
                        }
                    }
                }
                else
                {
                    throw new SerialException("The com port identifier '" + comPort + "' is not a valid serial port identifier");
                }
                if (!found)
                {
                    throw new SerialException("Serial port '" + comPort + "' not found");
                }

                serial.PortName = comPort;
                try
                {
                    serial.Open();
                }
                catch (UnauthorizedAccessException uaex)
                {
                    throw new SerialException("Cannot open a serial port in use by another application", uaex);
                }

                try
                {
                    serial.BaudRate = confBaudRate;
                    serial.DataBits = confDataBits;
                    serial.Parity = confParityControl;
                    serial.StopBits = confStopBits;
                }
                catch (Exception e)
                {
                    throw new SerialException("Serial port parameter invalid for '" + comPort + "'.\n" + e.Message, e);
                }
            }
        }

        public void close()
        {
            if (serial.IsOpen)
            {
                serial.Close();
            }
        }

// ===================================================================================
// Auxiliary private Methods

        private int findString(string[] set, string search)
        {
            if (set != null)
            {
                for (int i = 0; i < set.Length; i++)
                {
                    if (set[i].Equals(search))
                    {
                        return i;
                    }
                }
            }
            return -1;
        }

        private bool nameIsComm(string name)
        {
            int comNumber;
            int.TryParse(name.Substring(3), out comNumber);
            if (name.Substring(0, 3).Equals("COM"))
            {
                if (comNumber > -1 && comNumber < 256)
                {
                    return true;
                }
            }
            return false;
        }

// =================================================================================
// Device state Methods

        public bool isOpen()
        {
            return serial.IsOpen;
        }

        public bool hasData()
        {
            int amount = serial.BytesToRead;
            if (amount > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

// ==================================================================================
// Input Methods

        public char getChar()
        {
            int data = serial.ReadByte();
            return (char)data;
        }

        public int getBytes(ref byte[] b)
        {
            int size = b.Length;
            char c;
            int counter = 0;
            for (counter = 0; counter < size; counter++)
            {
                if (tryGetChar(out c))
                {
                    b[counter] = (byte)c;
                }
                else
                {
                    break;
                }
            }
            return counter;
        }

        public string getStringUntil(char x)
        {
            char c;
            string response = "";
            while (tryGetChar(out c))
            {
                response = response + c;
                if (c == x)
                {
                    break;
                }
            }
            return response;
        }

        public bool tryGetChar(out char c)
        {
            c = (char)0x00;
            byte[] b = new byte[1];
            long to = 10;
            long ft = System.Environment.TickCount + to;
            while (System.Environment.TickCount < ft)
            {
                if (hasData())
                {
                    int data = serial.ReadByte();
                    c = (char)data;
                    return true;
                }
            }
            return false;
        }

// ================================================================================
// Output Methods

        public void sendString(string data)
        {
            byte[] bytes = encoding.GetBytes(data);
            serial.Write(bytes, 0, bytes.Length);
        }

        public void sendChar(char c)
        {
            char[] data = new char[1];
            data[0] = c;
            serial.Write(data, 0, 1);
        }


        public void sendBytes(byte[] data)
        {
            serial.Write(data, 0, data.Length);
        }

        public void clearBuffer()
        {
            if (serial.IsOpen)
            {
                serial.DiscardInBuffer();
                serial.DiscardOutBuffer();
            }
        }

    }

}