namespace Morse
{
public partial class Form1 : Form
{
    int dit;
    int rest;
    int dah;
    string batch;
    string key;
    int A;
    int len;
    int dah2;
    bool xmit = false;
    //public ushort freq = 1500;

    SerialPort myport = new System.IO.Ports.SerialPort("COM4", 9600, System.IO.Ports.Parity.None, 8, System.IO.Ports.StopBits.One);
    public Form1()
    {
        InitializeComponent();
    }
    public void button1_Click(object sender, EventArgs e)
    {
        dit = Convert.ToInt32(50000 / Convert.ToInt32(numericUpDown1.Value * 50));
        rest = Convert.ToInt32(dit);
        dah = Convert.ToInt32(3 * dit);
        dah2 = Convert.ToInt32(dit);

        Code();
    }

    private void Code()
    {

        batch = textBox1.Text.ToUpper();
        len = batch.Length;

        for (A = 1; (A <= len); A++)
        {
            key = batch.Substring((A - 1), 0);



            if ((key == " "))
            {
                Thread.Sleep(dit * 8);
            }


            if ((key == "A"))
            {
                myport.Open();
                myport.RtsEnable = true;
                Thread.Sleep(dit);
                myport.RtsEnable = false;
                Thread.Sleep(rest);
                myport.RtsEnable = true;
                Thread.Sleep(dah);
                myport.RtsEnable = false;
                Thread.Sleep(dah2);
                myport.Close();

            }
            else if ((key == "B"))
            {
                myport.Open();
                myport.RtsEnable = true;
                Thread.Sleep(dah);
                myport.RtsEnable = false;
                Thread.Sleep(rest);
                myport.RtsEnable = true;
                Thread.Sleep(dit);
                myport.RtsEnable = false;
                Thread.Sleep(rest);
                myport.RtsEnable = true;
                Thread.Sleep(dit);
                myport.RtsEnable = false;
                Thread.Sleep(rest);
                myport.RtsEnable = true;
                Thread.Sleep(dit);
                myport.RtsEnable = false;
                Thread.Sleep(dah2);
                myport.Close();
            }