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.Threading;

namespace MAX7219_UART_01
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

byte[] buffer = { 4 };

private void Form1_Load(object sender, EventArgs e)
        {
            serialPort1.Open();
            serialPort1.Write(buffer, 0, 1);
        }

private void btnEnviar_Click(object sender, EventArgs e)
        {
            int dir, data;
            dir = Convert.ToInt32(txtDir.Text);
            data = Convert.ToInt32(txtData.Text);
            write_max72((byte)dir, (byte)data);
        }

private void write_max72(byte address, byte dato)
        {
            int num, a, i;
            double b = 0;
            int com;
            buffer[0] = 0;
            serialPort1.Write(buffer, 0, 1); //cs 0
            num = (address << 8) + dato;
            for (i = 15; i > 0; i--)
            {
                a = (num & 0x0001);
                b = b + (Math.Pow(2, i) * a);
                num = num >> 1;
            }
            for (i = 0; i < 16; i++)
            {
                com = ((int)b & 0x01);
                buffer[0] = (byte)com;
                serialPort1.Write(buffer, 0, 1); //data
                com += 2;
                buffer[0] = (byte)com;
                serialPort1.Write(buffer, 0, 1); //sck High
                com -= 2;
                buffer[0] = (byte)com;
                serialPort1.Write(buffer, 0, 1); //sck low
                b = (int)((int)b >> 1);
            }
            buffer[0] = 4;
            serialPort1.Write(buffer, 0, 1); //cs 1
            Thread.Sleep(1);
        }

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            serialPort1.Close();
        }
    }
}

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