75、基于51单片机八路模拟电压采集电路图及程序

#include<AT89X52.H> #define uchar unsigned char #define uint unsigned int uint a1,b1,ge,fen,fen1; uchar code dispcode[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0Xff};//0-9 s、 d 共阳数码管段选数据 uchar t;uchar dispbuf[4]={0,0,0,0};// 0x76,0x3f,0x3f,0x4f uchar dispcount; sbit W0=P3^5; // sbit W1=P3^4; // sbit W2=P3^3; // sbit W3=P3^2; //位选 sbit PIN=P1^7; sbit st=P2^4;//A/D转换控制 sbit ale=P2^3;//通道控制 sbit oe=P2^5;//输出控制 sbit eoc=P3^7;//转换结束标志 sbit a=P2^0; sbit b=P2^1; sbit c=P2^2; sbit k1=P3^0;//功能转换键 sbit k2=P3^1;//通道选择键 void delay(uchar x) { uint a,b; for(a=x;a>0;a--) for(b=110;b>0;b--); } void xz()//通道选择 { if(t==1) { a=0; b=0; c=0; ale=1; delay(1); ale=0; } if(t==2) { a=1; b=0; c=0; ale=1; delay(1); ale=0; } if(t==3) { a=0; b=1; c=0; ale=1; delay(1); ale=0; } if(t==4) { a=1; b=1; c=1; ale=1; delay(1); ale=0; } if(t==5) { a=0; b=1; c=1; ale=1; delay(1); ale=0; } if(t==6) { a=1; b=0; c=1; ale=1; delay(1); ale=0; } if(t==7) { a=0; b=0; c=1; ale=1; delay(1); ale=0; } if(t==8) { a=1; b=1; c=0; ale=1; delay(1); ale=0; } } void aj()//按键 { if(k1==0) { delay(2); if(k1==0) TR1=!TR1; while(!k1); } if(TR1==0) { if(k2==0) { delay(5); if(k2==0) { t++; if(t==9) t=1; } while(!k2); } } } void du()//读数据 { uchar tmp; st=1; st=0; delay(1);//这里必须延时 if(eoc==1)//转换结束标志 { oe=1; delay(1); tmp=P0; oe=0; delay(1); } ge=tmp/51; a1=(tmp%51)*10; fen=a1/51; b1=(a1%51)*10; fen1=b1/51; dispbuf[0]=dispcode[t]; dispbuf[1]=dispcode[ge]; dispbuf[2]=dispcode[fen]; dispbuf[3]=dispcode[fen1]; } void init()//初始化 { EA=1; ET1=1; TMOD=0x10; TH1=(65536-50000)/256; TL1=(65536-50000)%256; T2MOD=0x00; /*定时器2为工作模式) */ T2CON=0x04; /*定时器2为自动重装定时工作模式) TR2=1 */ RCAP2L=(65536-4000)%256; //给定时器T2装初值 RCAP2H=(65536-4000)/256; TR2=1; //打开定时器中断1，2 ET2=1; W0=1; W1=1; W2=1; W3=1; ale=0; oe=0; st=0; t=1;k1=1;k2=1; } void as() interrupt 3 using 0 { uchar a; TH1=(65536-50000)/256; TL1=(65536-50000)%256; a++; if(a==20) { a=0; t++; if(t==9) t=1; } } void main() { init(); while(1) { aj(); xz(); du(); } } void t1(void) interrupt 5 using 0 { TF2=0; //T2定时器必须用软件清0 P1=dispbuf[dispcount]; //控制数码管 显示 if (dispcount==0) { W0=0; W1=1; W2=1; W3=1; } if(dispcount==1) { PIN=0; W0=1; W1=0; W2=1; W3=1; } if(dispcount==2) { PIN=1; W0=1; W1=1; W2=0; W3=1; } if(dispcount==3) { W0=1; W1=1; W2=1; W3=0; } dispcount++; if(dispcount==4) dispcount=0; }