STC89C51单片机产生正弦波、方波、三角波LED显示频率源程序#include <stdio.h>#include<reg52.h>#define uchar unsigned char#define uint unsigned intsbit LATCH1=P2^6;//定义锁存使能端口段锁存sbit LATCH2=P2^7;// 位锁存unsigned char TempData[8]; //存储显示值的全局变量unsigned char code DuanMa[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};// 显示段码值0~9unsigned char code DuanMa2[10]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};// 显示段码值0~9unsigned char code DuanMa1[3]={0x77,0x7c,0x39};unsigned char code WeiMa[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//分别对应相应的数码管点亮,即位码#define DataPort P0sbit keyA=P3^3;sbit keyB=P3^4;sbit keyC=P3^5;sbit wc=P1^0;sbit scl=P1^1;sbit sda=P1^2;sbit scl1=P1^3;sbit sda1=P1^4;sbit p5=P1^5;sbit p6=P1^6;sbit p7=P1^7;uint sign,ad;uchar temp[10], temp1[3];//定义显示区域临时存储数组uchar voltage; //定义浮点变量uchar l=0,m=100,n=0;uchar code sin[200] = {52,53,55,56,58,59,61,62,64,65,67,68,70,71,73,74,75,77,78,79,81,82,83,84,85,86,88,89,90,90,91,92,93,94,95,95,96,96,97,97,98,98,98,99,99,99,99,100,100,100,100,100,9 9,99,99,99,98,98,98,97,97,96,96,95,95,94,93,92,91,90,89,88,87,86,85,84,83,82,81,79,7 8,77,75,74,73,71,70,68,67,65,64,62,61,59,58,56,55,53,52,50,48,47,45,44,42,41,39,38,3 6,34,33,32,30,29,27,26,24,23,22,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,5,4,4,3,2,2,2,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,2,2,2,3,4,4,5,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,22,23,24,26,27,29,30,32,33,35,36,38,39,41,42,44,45,47,48,50};void DelayUs2x(unsigned char t){while(--t);}void DelayMs(unsigned char t){while(t--){//大致延时1mSDelayUs2x(245);DelayUs2x(245);}}void delay(){ ;; }void delay1(uchar x){uchar a,b;for(a=x;a>0;a--)for(b=110;b>0;b--);}void Delay2(unsigned int t){while(--t);}void Display(){uchar i;for(i=0;i<4;i++){DataPort=WeiMa[i]; //取位码LATCH2=1; //位锁存LATCH2=0;if(i==0) DataPort=DuanMa1[sign-1];else if(i==1) DataPort=DuanMa2[temp1[i]];else DataPort=DuanMa[temp1[i]]; //取显示数据，段码LATCH1=1; //段锁存LATCH1=0;Delay2(500); // 扫描间隙延时，时间太长会闪烁，太短会造成重影}}//pcf8591void init1(){sda1=1;delay();scl1=1;delay();}void start1() //开始信号{sda1=1;delay();scl1=1;delay();sda1=0;delay();}void stop1() //停止{sda1=0;delay();scl1=1;delay();sda1=1;delay();}void respons1() //应答{uchar i;scl1=1;delay();while((sda1==1)&&(i<250))i++;scl1=0;delay();}void write_byte1(uchar date) {uchar i,temp;temp=date;for(i=0;i<8;i++){temp=temp<<1;scl1=0;delay();sda1=CY;delay();scl1=1;delay();}scl1=0;delay();sda1=1;delay();}uchar read_byte1(){uchar i,k;scl1=0;delay();sda1=1;delay();for(i=0;i<8;i++){scl1=1;delay();k=(k<<1)|sda1;scl1=0;delay();}return k;}void write_add1(uchar date) //写入DA{start1();write_byte1(0x90);respons1();write_byte1(0x40);respons1();write_byte1(date);respons1();// delay1(100);stop1();}uchar read_add1( uchar address ) //读AD值{uchar date;start1();write_byte1(0x90);respons1();write_byte1(0x40|address);respons1();start1();write_byte1(0x91);respons1();date=read_byte1();stop1();return date;}//键盘void keyscan(){if(keyA==0){delay1(10);if(keyA==0)sign=1;while(!keyA);}if(keyB==0){delay1(10);if(keyB==0)sign=2;while(!keyB);}if(keyC==0){delay1(10);if(keyC==0)sign=3;while(!keyC);}}//eepromvoid start() //开始信号{sda=1;delay();scl=1;delay();sda=0;delay();}void stop() //停止{sda=0;delay();scl=1;delay();sda=1;delay();}void respons() //应答{uchar i;scl=1;delay();while((sda==1)&&(i<250))i++;scl=0;delay();}void init(){sda=1;delay();scl=1;delay();}void write_byte(uchar date){uchar i,temp;temp=date;for(i=0;i<8;i++){temp=temp<<1;scl=0;sda=CY;delay();scl=1;delay();}scl=0;delay();sda=1;delay();}uchar read_byte(){uchar i,k;scl=0;delay();sda=1;delay();for(i=0;i<8;i++){scl=1;delay();k=(k<<1)|sda;scl=0;delay();}return k;}void write_add(uchar date[],uchar address ) {uchar i,*pdate;pdate=date;for(i=0;i<2;i++){write_byte(0xae);respons();write_byte(address+i);respons();write_byte(*(pdate+i));respons();stop();}}void read_add(uchar date[] ,uchar address ) {uchar i,*pdate;pdate=date;for(i=0;i<2;i++){start();write_byte(0xae);respons();write_byte(address+i);respons();start();write_byte(0xaf);respons();*(pdate+i)=read_byte();stop();}}void sj(){if(l<100){write_add1(l);l++;}if(l>=100&m>0){write_add1(m);m--;}if(l>=100&m<=0){l=0;m=100;}p5=0;p6=1;p7=1;}void zx(){if(l<200){write_add1(sin[l]);l++;}if(l>=200)l=0;p6=0;p7=1;p5=1;}void fb(){if(l<100){write_add1(255);l++;}if(l>=100&n<100){write_add1(0);n++;}if(l>=100&n>=100){l=0;n=0;}p7=0;p5=1;p6=1;}void main(){uchar i,num,tab[2];//定义显示区域临时存储数组wc=0;num=0;tab[0]=0;tab[1]=0;TMOD=0x21;//设置定时器1为工作方式2定时器0为工作方式1 TH1=0xfd;TL1=0xfd;TR1=1;REN=1;SM0=0;SM1=1;EA=1;ES=1;init();init1();for(i=0;i<5;i++)num=read_add1(0);read_add(tab,1);sign=tab[0];ad=(uint)num*100;TH0=(65536-ad)/256;TL0=(65536-ad)%256;ET0=1; //定时器中断打开TR0=1;while(1){keyscan();for(i=0;i<5;i++)num=read_add1(0);voltage=500/num;ad=(uint)num*100;tab[0]=sign;tab[1]=ad;write_add(tab,1);num=read_add1(0);voltage=500/num;temp1[0]=voltage/100;temp1[1]=(voltage%100)/10;temp1[2]=voltage%1000;Display();}}void ser() interrupt 4{RI=0;sign=SBUF;}void T0_time() interrupt 1{ad=(uint)read_add1(0)*100;TH0=(65536-ad)/256;TL0=(65536-ad)%256;if(sign==1) sj(); if(sign==2) zx(); if(sign==3) fb(); }。