// Bai2_19.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#include <conio.h>

#include <stdio.h>

#include <math.h>

#include <dos.h>

#include <PCIXP.h>

#define pi 3.14143

void delay(int time)

{

int i,j;

for(i=0;i<time;i++)

for(j=0;j<1000;j++);

}

void main()

{

int add=Get_Addr("PCI_ADC");

int time;

char k;

printf("

Chuong trinh tao song vuong co do rong thay doi duoc.");

printf("

Nhan phim 't' de tang do rong xung. Phim 'g' de giam do rong xung.");

printf("

Nhan phim 'Esc' de thoat chuong trinh");

time = 150;

do

{

while(!kbhit())

{

outportb(add+2,0);

outportb(add+3,0);

delay(time);

outportb(add+2,4095);

outportb(add+3,4095>>8);

delay(300-time);

}

k = getch();

if(k=='t'&& time<290)

time = time+5;

if(k=='g'&& time>10)

time = time-5;

}while(k!=27);

}