本文是基于89C51的八路AD轉(zhuǎn)換系統(tǒng)設(shè)計(jì)

一)硬件部分：

二)程序部分：

#include

#include

#define uchar unsigned char

#define uint unsigned int

#define ADC0809 XBYTE[0x7fff]

uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

uchar code act[4]={0xfe,0xfd,0xfb,0xf7};

sbit P1_7=P1^7;

sbit P2_6=P2^6;

sbit P3_3=P3^3;

bit flag;

uchar m;

uint X[8];

void d200us(void);

void delay(uint k);

/******************************/

void main(void)

{

TMOD=0x01;

TH0=-(1000/256);

TL0=-(1000%256);

TR0=1;

IE=0x82;

while(1)

{

if(!P2_6){delay(30);if(!P2_6)flag=!flag;delay(300);}

ADC0809=m;

while(!P3_3);

X[m]=ADC0809;

m++;

if(m>7)m=0;

delay(50);

}

}

/************************************/

void delay(uint k)

{

uint i,j;

for(i=0;i for(j=0;j60;j++)

{;}}

}

/***********************************/

void timer0(void) interrupt 1 using 1

{static uchar disbit,n;static uint cnt;

TH0=-(1000/256);

TL0=-(1000%256);

switch(disbit)

{

case 0:{P1=SEG7[n];if(flag)P1_7=1;else P1_7=0;}break;

case 1:{P1=SEG7[(X[n]*49/25)/100];P1_7=1;}break;

case 2:{P1=SEG7[(X[n]*49/25)%100/10];}break;

case 3:{P1=SEG7[(X[n]*49/25)%100%10];}break;

default:break;

}

P2=act[disbit];

disbit++;cnt++;

if(disbit>3)disbit=0;

if(!flag)

{if(cnt>500){cnt=0;n++;}}

if(n>7)n=0;

}