<plugin>
  <instance class="SerialIO" />
  <code>//
// SerialIO v0.2
//    A Plugin to the Gear Propeller Simulator that allows connecting
//    to a FullDuplexSerial object running on the propeller chip.
//
// CHANGELOG
// v0.2 - Fixes a bug in handling receiving a 0 byte.
//
// 2009 Ben Levitt
//


using System;
using System.Drawing;
using System.Windows.Forms;

using Gear.PluginSupport;
using Gear.EmulationCore;


class SerialIO : PluginBase
{
  public class SerialTextBox:TextBox
  {
    public SerialIO serial;
    
    private const int WM_PASTE = 0x0302;
    
    protected override void WndProc(ref Message m)
    {
      switch (m.Msg) {
        case WM_PASTE:
          if (Clipboard.ContainsText() == true) {
            // Add to the send buffer
            this.serial.SendString(Clipboard.GetText());
          }
          break;
          
        default:
          base.WndProc(ref m);
          break;
      }
    }
  }


  private Propeller Chip;
  
  private int rxPin;
  private int txPin;
  private int baud;
  private double bitTime;
  
  private String displayBuffer;
  
  private double rxLastTime;
  private int rxPhase;        // 0=wait for hi, 1=wait for low, 2=wait for data
  private int rxBitPos;
  private int rxCurrentByte;
  
  private String txBuffer;
  private double txLastTime;
  private int txPhase;        // 0=idle, 1=send low, 2=send data, 3=send high
  private int txBitPos;
  
  // GUI elements
  private TextBox rxPinField;
  private TextBox txPinField;
  private TextBox baudField;
  
  private SerialTextBox bodyField;
  
  
  public override string Title
  {
    get { return "Serial"; }
  }
  
  
  public override Boolean AllowHotKeys
  {
    get { return false; }
  }
  
  
  public SerialIO()
  {
    rxPin = 30;
    txPin = 31;
    baud  = 57600;
    displayBuffer = "";
    
    this.BuildGui();
    this.OnReset();
  }
  
  
  public override void OnReset()
  {
    // Setup vars
    rxLastTime = 0;
    rxPhase = 0;
    rxBitPos = 0;
    rxCurrentByte = 0;
    
    txBuffer = "";
    txLastTime = 0;
    txPhase = 0;
    txBitPos = 0;
    
    rxPin = Convert.ToInt32(rxPinField.Text);
    txPin = Convert.ToInt32(txPinField.Text);
    baud = Convert.ToInt32(baudField.Text);
    bitTime = 1.0/baud;
  }
  
  
  private void BuildGui()
  {
    // Build the Plugin UI
    System.Windows.Forms.TableLayoutPanel tableLayoutPanel = new System.Windows.Forms.TableLayoutPanel();
    System.Windows.Forms.Label rxPinLabel = new System.Windows.Forms.Label();
    System.Windows.Forms.Label txPinLabel = new System.Windows.Forms.Label();
    System.Windows.Forms.Label baudLabel = new System.Windows.Forms.Label();
    System.Windows.Forms.Button resetButton = new System.Windows.Forms.Button();
    System.Windows.Forms.Button clearButton = new System.Windows.Forms.Button();
    
    this.rxPinField = new System.Windows.Forms.TextBox();
    this.txPinField = new System.Windows.Forms.TextBox();
    this.baudField = new System.Windows.Forms.TextBox();
    this.bodyField = new SerialTextBox();
    
    this.SuspendLayout();
    tableLayoutPanel.SuspendLayout();
    
    tableLayoutPanel.ColumnCount = 8;
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    tableLayoutPanel.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 15F));
    
    tableLayoutPanel.Controls.Add(clearButton, 0, 0);
    tableLayoutPanel.Controls.Add(rxPinLabel,       1, 0);
    tableLayoutPanel.Controls.Add(this.rxPinField,  2, 0);
    tableLayoutPanel.Controls.Add(txPinLabel,       3, 0);
    tableLayoutPanel.Controls.Add(this.txPinField,  4, 0);
    tableLayoutPanel.Controls.Add(baudLabel,        5, 0);
    tableLayoutPanel.Controls.Add(this.baudField,   6, 0);
    tableLayoutPanel.Controls.Add(resetButton, 7, 0);
    tableLayoutPanel.Controls.Add(this.bodyField,   0, 1);
    
    tableLayoutPanel.SetColumnSpan(this.bodyField, 8);
    
    tableLayoutPanel.GrowStyle = System.Windows.Forms.TableLayoutPanelGrowStyle.FixedSize;
    tableLayoutPanel.Dock = System.Windows.Forms.DockStyle.Fill;
    tableLayoutPanel.Name = "tableLayoutPanel";
    tableLayoutPanel.RowCount = 2;
    tableLayoutPanel.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Absolute, 30F));
    tableLayoutPanel.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 100F));
    tableLayoutPanel.TabIndex = 6;
    
    rxPinLabel.Text = "Rx Pin:";
    rxPinLabel.TextAlign = ContentAlignment.MiddleRight;
    rxPinLabel.Dock = System.Windows.Forms.DockStyle.Fill;
    
    txPinLabel.Text = "Tx Pin:";
    txPinLabel.TextAlign = ContentAlignment.MiddleRight;
    txPinLabel.Dock = System.Windows.Forms.DockStyle.Fill;
    
    baudLabel.Text = "Baud Rate:";
    baudLabel.TextAlign = ContentAlignment.MiddleRight;
    baudLabel.Dock = System.Windows.Forms.DockStyle.Fill;
    
    this.rxPinField.BackColor = System.Drawing.SystemColors.Window;
    this.rxPinField.Font = new System.Drawing.Font("Courier New", 9.75F, 
         System.Drawing.FontStyle.Regular, 
         System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    this.rxPinField.Multiline = false;
    this.rxPinField.Text = Convert.ToString(rxPin);
    this.rxPinField.Dock = System.Windows.Forms.DockStyle.Fill;
    this.rxPinField.Name = "rxPinField";
    this.rxPinField.TabIndex = 1;
    
    this.txPinField.BackColor = System.Drawing.SystemColors.Window;
    this.txPinField.Font = new System.Drawing.Font("Courier New", 9.75F, 
         System.Drawing.FontStyle.Regular, 
         System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    this.txPinField.Multiline = false;
    this.txPinField.Text = Convert.ToString(txPin);
    this.txPinField.Dock = System.Windows.Forms.DockStyle.Fill;
    this.txPinField.Name = "txPinField";
    this.txPinField.TabIndex = 2;
    
    this.baudField.BackColor = System.Drawing.SystemColors.Window;
    this.baudField.Font = new System.Drawing.Font("Courier New", 9.75F, 
         System.Drawing.FontStyle.Regular, 
         System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    this.baudField.Multiline = false;
    this.baudField.Text = Convert.ToString(baud);
    this.baudField.Dock = System.Windows.Forms.DockStyle.Fill;
    this.baudField.Name = "baudField";
    this.baudField.TabIndex = 3;
    
    this.bodyField.BackColor = System.Drawing.SystemColors.Window;
    this.bodyField.Font = new System.Drawing.Font("Courier New", 9.75F, 
         System.Drawing.FontStyle.Regular, 
         System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    //this.bodyField.ReadOnly = true;
    this.bodyField.Multiline = true;
    this.bodyField.Name = "bodyField";
    this.bodyField.TabIndex = 0;
    this.bodyField.Dock = System.Windows.Forms.DockStyle.Fill;
    this.bodyField.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txt_KeyPress);
    this.bodyField.serial = this;
    
    resetButton.Text = "Reset Serial";
    resetButton.TabIndex = 4;
    resetButton.Name = "resetButton";
    resetButton.Dock = System.Windows.Forms.DockStyle.Fill;
    resetButton.Click += new System.EventHandler(this.reset_Click);
    
    clearButton.Text = "Clear Text";
    clearButton.TabIndex = 4;
    clearButton.Name = "clearButton";
    clearButton.Dock = System.Windows.Forms.DockStyle.Fill;
    clearButton.Click += new System.EventHandler(this.clear_Click);
    
    this.Controls.Add(tableLayoutPanel);
    tableLayoutPanel.ResumeLayout(false);
    tableLayoutPanel.PerformLayout();
    this.ResumeLayout(false);
    this.PerformLayout();
    
    this.bodyField.Focus();
  }
  
  
  public override void PresentChip(Propeller host)
  {
    Chip = host;
    
    Chip.NotifyOnClock(this);
    Chip.DrivePin(txPin, false, true);
  }
  
  
  public override void OnClock(double time)
  {
    this.HandleRx(time);
    this.HandleTx(time);
  }
  
  
  private void HandleRx(double time)
  {
    bool bit = ((Chip.OUT &amp; ((ulong)1 &lt;&lt; rxPin)) != 0);
    
    if (rxPhase == 0) {
      if (bit) {
        rxPhase = 1;
      }
      return;
    }
    else if (rxPhase == 1) {
      if (!bit) {
        rxPhase = 2;
        rxLastTime = time + bitTime/2;
      }
      return;
    }
    else if (rxPhase == 2) {
      double delta = time - rxLastTime;
      
      if (delta &gt; bitTime) {
        this.GetBit(bit);
        rxLastTime += bitTime;
      }
    }
  }
  
  
  private void GetBit(bool bit)
  {
    if (bit) {
      rxCurrentByte |= (1 &lt;&lt; rxBitPos);
    }
    rxBitPos++;
    
    // displayBuffer += ((bit) ? '1' : '.');
    
    if (rxBitPos == 8) {
      rxBitPos = 0;
      rxPhase = 0;
      
      if (rxCurrentByte == 13 || rxCurrentByte == 10) {
        displayBuffer += "\r\n";
      }
      else if (rxCurrentByte &gt; 0) {
        displayBuffer += Convert.ToChar(rxCurrentByte);
      }
      
      rxCurrentByte = 0;
    }
    this.bodyField.Text = displayBuffer;
    this.bodyField.SelectionStart = this.bodyField.Text.Length;
  }
  
  
  private void HandleTx(double time)
  {
    if (txPhase == 1) {
      Chip.DrivePin(txPin, false, false);
      txPhase = 2;
      txLastTime = time;
      return;
    }
    else if (txPhase == 2) {
      double delta = time - txLastTime;
      
      if (delta &gt; bitTime) {
        this.SendBit();
        txLastTime += bitTime;
      }
    }
    else if (txPhase == 3) {
      double delta = time - txLastTime;
      
      if (delta &gt; bitTime) {
        txPhase = ((txBuffer.Length &gt; 0) ? 1 : 0);
      }
      return;
    }
  }
  
  
  private void SendBit()
  {
    if (txBitPos == 8) {
      txBitPos = 0;
      txPhase = 3;
      txBuffer = txBuffer.Substring(1, txBuffer.Length-1);
      Chip.DrivePin(txPin, true, true);
      return;
    }
    
    int sendByte = (int)(txBuffer[0]);
    bool bit = ((sendByte &amp; (1 &lt;&lt; txBitPos)) != 0);
    Chip.DrivePin(txPin, false, bit);
    
    txBitPos++;
  }
  
  
  // Handle Paste
  public void SendString(String str)
  {
    txBuffer += str;
    displayBuffer += str;
    this.bodyField.Text = displayBuffer;
    
    if (txPhase == 0) {
      txPhase = 1;
    }
  }
  
  
  private void ClearText()
  {
    displayBuffer = "";
    this.bodyField.Text = displayBuffer;
  }
  
  
  private void txt_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
  {
    if ((Control.ModifierKeys &amp; Keys.Control) != 0) {
      return;
    }
    
    e.Handled = true;

    txBuffer += e.KeyChar;
    
    if (e.KeyChar == '\n' || e.KeyChar == '\r') {
      displayBuffer += "\r\n";
    }
    else {
      displayBuffer += e.KeyChar;
    }
    
    this.bodyField.Text = displayBuffer;
    
    if (txPhase == 0) {
      txPhase = 1;
    }
  }
  
  
  private void clear_Click(object sender, System.EventArgs e)
  {
    this.ClearText();
    this.bodyField.Focus();
  }
  
  
  private void reset_Click(object sender, System.EventArgs e)
  {
    this.OnReset();
    this.bodyField.Focus();
  }
}

</code>
</plugin> 