dac0804.c

8位DA转换程序

//flow light and beep 
#include <reg51.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
sbit adrd=P3^7;                          //IO口定义
sbit adwr=P3^6;
sbit diola=P2^5;
sbit dula=P2^6;
sbit wela=P2^7;
sbit csda=P3^5;


sbit dawr=P3^6;

unsigned char j,k;
unsigned char a,b;

sbit beep=P2^3;

void dazhuanhuan();

void delay10ms()
{
    for(a=100;a>0;a--)
    for(b=225;b>0;b--);
}
   //拧动AD旁边的电位器，会在数码管的前三位显示0-255之间的数值。这就是把模拟电压转换成数字信号。

void delay(unsigned char i)		//延时程序
{
  for(j=i;j>0;j--)
    for(k=125;k>0;k--);
}

void main()
{ 
	while(1)
	{
		dazhuanhuan();
	}
}

void dazhuanhuan()
{
  unsigned char a,k;
  wela=0;
  dula=0;
  csda=0;
  a=0;
  dawr=0;
  for(k=0;k<255;k++)
  {
	  P0=a;
	  delay(50);
	  a++;
  }
}