CODIGO EN JAVA

Bueno para la creacion de nuestra aplicacion utlizamos JCreator y tres clases.java las cuales las mostraremos acontinucion. Solo copiar y pegar en JCreator para probar el codigo y que no tenga errores. Las dos primeras clases corresponden al codigo de manejo de puertos y la ultima es la aplicacion que realizamos para enviar el dato en decimal por teclado y mostralo en decimal en los leds y en hexadecimal en el display de 7 segmentos.

1. La clase ioport.java

public class ioPort
{
   // declare native methods of 'jnpout32.dll'
   // output a value to a specified port address
   public native void Out32(short PortAddress, short data);

   // input a value from a specified port address
   public native short Inp32(short PortAddress);

   // load 'jnpout32.dll'
   static { System.loadLibrary("jnpout32");}
}

2. La clase pPort.java

public class pPort
{
   ioPort pp;                  // wrapper class for 'Jnpout32.dll'
                               // with methods:
                               //    int Out32(int port, int value);
                               //    int Inp32(int port);
   short portAddress;          // address of data port
   short currentVal;           // current value of port bits

   public pPort()
   {
      pp = new ioPort();
      portAddress = (short)0x378;     // Hex Address of Data Byte of PC Parallel Port
      setAllDataBits((short)0);       // initialize port bits to 0
      currentVal = 0x00;
   }

   // wrap ParallelPort output method
   public void output(short port, short value)
   {
      pp.Out32(port, value);
   }

   // wrap ParallelPort input method
   public short input(short port)
   {
       return pp.Inp32(port);
   }

    // output to default Data port
    public void output(short value)
    {
       pp.Out32(portAddress, value);
    }

    // input from default Data port
    public short input()
    {
        return pp.Inp32(portAddress);
    }


  /**
   * set all bits on Data port to zero
   **/
   public void setAllDataBits(short value)
   {
      pp.Out32(portAddress, value);
      currentVal = value;
   }


   // For users who prefer dealing with Pin numbers
   //    Set Pin <pin> to <value>
   public void setPin(short pin, short value)
   {
      if (pin >= 2 && pin <= 9)
         // just set the corresponding Data bit to indicted value
         setDataBit((short)(pin-2), value);
   }


   /**
    * Set Data Bit at selected index to a value of 1 or 0
    * while preserving current values of all other Data bits
    **/
   void setDataBit(short index, short value)
   {
      switch(index)
      {
         case 0:
           if (value==0)                        //  Set Data[0] to 0

              currentVal = (short) (currentVal & 0xFE);
                                                       //      aaaa aaaa  currentVal
                                                //  AND 1111 1110  mask
                                                //      =========
                                                //      aaaa aaa0  new currentVal

           else                                 //  Set Data[0] to 1

              currentVal = (short) (currentVal | 0x01);
                                                        //      aaaa aaaa   currentVal
                                                //  OR  0000 0001   mask
                                                //      =========
                                                //      aaaa aaa1   new currentVal
           break;
         case 1:
           if (value==0)
              currentVal = (short) (currentVal & 0xFD);
                                                        //  currentVal = aaaa aa0a
           else
              currentVal = (short) (currentVal | 0x02);
                                                        //  currentVal = aaaa aa1a
           break;
         case 2:
           if (value==0)
              currentVal = (short) (currentVal & 0xFB);
                                                        //  currentVal = aaaa a0aa
           else
              currentVal = (short) (currentVal | 0x04);
                                                        //  currentVal = aaaa a1aa
           break;
         case 3:
           if (value==1)
              currentVal = (short) (currentVal & 0xF7);
                                                        //  currentVal = aaaa 0aaa
           else
              currentVal = (short) (currentVal | 0x08);   //  currentVal = aaaa 1aaa
           break;
         case 4:
           if (value==0)
              currentVal = (short) (currentVal & 0xEF);
                                                        //  currentVal = aaa0 aaaa
           else
              currentVal = (short) (currentVal | 0x10);   //  currentVal = aaa1 aaaa
           break;
         case 5:
           if (value==0)
              currentVal = (short) (currentVal & 0xDF);
                                                        //  currentVal = aa0a aaaa
           else
              currentVal = (short) (currentVal | 0x20);   //  currentVal = aa1a aaaa
           break;
         case 6:
           if (value==0)
              currentVal = (short) (currentVal & 0xBF);
                                                        //  currentVal = a0aa aaaa
           else
              currentVal = (short) (currentVal | 0x40);   //  currentVal = a1aa aaaa
           break;
             case 7:
           if (value==0)
              currentVal = (short) (currentVal &  0x7F);
                                                        //  currentVal = 0aaa aaaa
           else
              currentVal = (short) (currentVal | 0x80);   //  currentVal = 1aaa aaaa
           break;

         default:
           System.out.println("index must be 0 - 7");
      }
      pp.Out32(portAddress, currentVal);
   }


}

Importante: Antes de ejecutar el programa debes copiar el archivo jnpout32.dll en la  misma carpeta donde estan las aplicaciones de java anteriormente nombradas. El archivo junto con las dos apliciones lo puedes descargar de la siguiente pagina:

Fuente:http://www.psicofxp.com/forums/programacion.313/425082-control-de-leds-puerto-paralelo-java.html
 

3. Por ultimo Aplicacion.java

import javax.swing.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Aplicacion extends JFrame implements ActionListener{
   
    public static pPort lpt = new pPort();
    JLabel l1= new JLabel ("Digite aqui el numero");
    JTextField t1 = new JTextField(10);
    JButton b1= new JButton ("Entrar");
    JPanel p1= new JPanel(null);
   
    public Aplicacion()
    {   
     setTitle ("Control de Leds por Puerto Paralelo");
     setSize (250,200);
     setDefaultCloseOperation(3);
     setLocation(100,100);
     setContentPane(p1);
    
     p1.add(l1); l1.setBounds(60,20,200,20);
     p1.add(t1); t1.setBounds(20,40,200,20);
     p1.add(b1); b1.setBounds(60,100,100,40);
     b1.addActionListener (this);
    
   }

   public void actionPerformed (ActionEvent e)
   {
       int num;
       num=Integer.parseInt(t1.getText());
    if (e.getSource()==b1){lpt.output((short)num);}
   }
  
   public void mensaje(String texto){JOptionPane.showMessageDialog(this,texto);}
  
   public static void main(String[] args) {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JDialog.setDefaultLookAndFeelDecorated(true);
        Aplicacion a1 = new Aplicacion();
        a1.setVisible(true);
    }

}