PCF8591(AD-DA)芯片-51单片机程序

//12MHZ晶振
#include
#include

#define uchar unsigned char
#define uint unsigned int

#include “I%&&&&&%.h”//i2c库函数

code uchar seg[]={0x28,0x7e,0xa2,0x62,0x74,0x61,0x21,0x7a,0x20,0x60}; //数码管码表
code uchar tab[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe}; //数码管位选

sbit bz=P3^3; //喇叭位

uchar outdata;//模拟量输出值

sbit k1=P1^2 ; //模拟量输出者添加
sbit k2=P1^1; //模拟量输出者削减

void delay(uint k) //延时子函数
{
while(k–);
}

void key1() //模拟输出值添加
{
if(k1==0)
{
delay(1000);
if(k1==0)
outdata++;
}
}

void key2() //模拟输出值削减
{
if(k2==0)
{
delay(1000);
if(k2==0)
outdata–;
}
}