Programacion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Threading;

namespace Display_MAX7219_LPT_01
{
    public partial class Form1 : Form
    {
        class ControlPort
        {
            [DllImport("inpout32.dll", EntryPoint = "Out32")]
            public static extern void Output(int adress, int value);
        }

public Form1()
        {
            InitializeComponent();
        }

int numero;
        byte i;

private void Form1_Load(object sender, EventArgs e)
        {
            ControlPort.Output(0x378, 4);
            write_max72(0x0F, 0x00); //display test
            write_max72(0x0B, 0x03); //scan limit
            write_max72(0x09, 0x0F); //decode mode
            write_max72(0x0A, 0x02); //intensity
            write_max72(0x0C, 0x01); //shutdown
            for (i = 1; i <= 4; i++)
                write_max72(i,0x0F);
        }

private void button1_Click(object sender, EventArgs e)
        {
            int nible;
            numero = (int)numericUpDown1.Value;
            string cadena = numero.ToString();
            cadena = cadena.PadLeft(4, '?');
            for (i = 1; i <= 4; i++)
            {
                nible = ((int)cadena[i - 1]) & 0x0F;
                write_max72((byte)(5-i), (byte)nible);
            }
        }

void write_max72(byte address, byte dato)
        {
            int num, a, i;
            double b = 0;
            int lpt;
            if (dato == 13)
                dato = 10;
            num = (address << 8) + dato;
            for (i = 15; i > 0; i--)
            {
                a = (num & 0x0001);
                b = b + (Math.Pow(2, i) * a);
                num = num >> 1;
            }
            ControlPort.Output(0x378, 0); //cs 0
            for (i = 0; i < 16; i++)
            {
                lpt = ((int)b & 0x01);
                ControlPort.Output(0x378, lpt); //data
                lpt = lpt + 2;
                ControlPort.Output(0x378, lpt); //sck High
                lpt = lpt - 2;
                ControlPort.Output(0x378, lpt); //sck low
                b = (int)((int)b >> 1);
            }
            ControlPort.Output(0x378, 4); //cs 1
            Thread.Sleep(1);
        }
    }
}

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