单片机入门小程序

51单片机的学习是一个动手实践的过程，很多同学在学习单片机的初期总是觉得很难，无法入门。

本人根据自己的学习经历，结合自己刚学习单片机的体验，写下几个小的程序供大家参考，如能掌握如下几个小程序的思想与精髓，那么就已经探踏入了单片机的大门。

学习单片机的核心就是动手实践，当我们通过自己的努力把第一个LED点亮时，我们就会信心加倍，之后的学习就会变得轻松!希望对大家有所帮助。

一个LED闪烁#include<reg51.h>sbit led=P0^3;unsigned int a;void main(){ P0=0x00;while(1){a=100000;led=1;while(a--);a=10000;led=0;while(a--); }}两个led闪烁#include<reg51.h>#define uchar unsigned char#define uint unsigned intvoid delay();void main(){while(1){ P0=0xaa;delay();P0=0x00;delay();}}void delay(){uchar x,y;for(x=110;x>0;x--)for(y=120;y>0;y--);}流水灯#include<reg51.h>#include<intrins.h>void delay();void main(){ unsigned char temp;P0=0xef;temp=P0;delay();while(1){temp=_crol_(temp,1);delay();}}void delay(){ unsigned char x,y;for(x=40;x>0;x--)for(y=200;y>0;y--);}键控移位信号灯#include<reg51.h>#include<intrins.h>#define uchar unsigned char#define uint unsigd neintsbit k1=P1^0;sbit k2=P1^1;void delay(uchar z);void main(){P0=0X18;while(1){if(k1)P0=_crol_(P0,1);if(k2)P0=_cror_(P0,1);}}void delay(uchar z){uchar x,y;for(x=z;x>0;x--)for(y=120;y>0;y--);}中断的简单应用1. 利用定时器中断实现LED闪烁#include<reg51.h>#define uchar unsigned char#define uint unsigned intsbit led1=P1^0;uchar num;void main(){P1=0x00;TMOD=0x01;TH0=(65536-45872)/265;TL0=(65536-45872)%256;EA=1;ET0=1;TR0=1;while(1);}void T0_time()interrupt 1{TH0=(65536-45872)/256;TL0=(65536-45872)%256;num++;if(num==20){num=0;led1=~led1;}}2. 数码管记录LED闪的次数#include<reg51.h>#define uchar unsigned char#define uint unsigned intsbit led=P1^2;void display(uchar,uchar);uchar num=0,num1=0,num2=0,shi=0,ge=0;uchar code array[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07}; void main(){TMOD=0x11;TH0=(65536-45872)/256;TL0=(65536-45872)%256;TH1=(65536-45872)/256;TL1=(65536-45872)%256;EA=1;ET0=1;ET1=1;TR0=1;TR1=1;while(1);{display(shi,ge);}}void display(uchar shi,uchar ge){P2=0x03;// P1^0=array[shi];// P1^1=array[ge];}/*void delay(z){uchar x,y;for(x=z;x>0;x--)for(y=110;y>0;y--);}*/void Time0() interrupt 1{TH0=(65536-45872)/256;TL0=(65536-45872)%256;num++;if(num==4){num=0;led=~led;}}void Time1() interrupt 2{TH1=(65536-45872)/256;TL1=(65536-45872)%256;num1++;if(num1==20){num1=0;num2++;if(num2==60)num2=0;shi=(num2)/10;ge=(num2)%10;}}数码管的动态显示#include<reg51.h>#define uchar unsigned char#define uint unsigned intuchar code duan[9]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07}; void delay();void main(){while(1){P2=0x7f;P0=0x3f;delay();P2=0xbf;P0=0x06;delay();P2=0xdf;P0=0x5b;delay();P2=0xef;P0=0x4f;delay();P2=0xf7;P0=0x66;delay();P2=0xfb;P0=0x6d;delay();P2=0xfd;P0=0x7d;delay();P2=0xfe;P0=0x07;delay();}}void delay(){uint x,y;for(x=10;x>0;x--)for(y=10;y>0;y--);}数码管的静态显示#include<reg51.h>#define uchar unsigned char#define uint unsigned intuchar code arry[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; void delay(uint z);void main(){P2=0x00;while(1){uchar i;for(i=0;i<10;i++){P0=arry[i];delay(500);}}}void delay(uint z){uint x,y;for(x=z;x>0;x--)for(y=110;y>0;y--);}数码管显示8#include<reg51.h>void main(){P2=0x7f; //位选端低电平有效P0=0x7f; //段选高电平有效（共阴）while(1);}AD转换#include<reg51.h>#include<intrins.h>#define uchar unsigned charsbit wr=P3^6;sbit rd=P3^7;sbit dula=P2^6;sbit wela=P2^7;uchar code shuma[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; void delay(uchar z){uchar x,y;for(x=z;x>0;x--)for(y=110;y>0;y--);}void display(uchar bai,uchar shi,uchar ge){dula=1;P0=shuma[bai];dula=0;P0=0xff;wela=1;P0=0x7e;wela=0;delay(10);dula=1;P0=shuma[shi];dula=0;P0=0xff;wela=1;P0=0x7d;wela=0;delay(10);dula=1;P0=shuma[ge];dula=0;P0=0xff;wela=1;P0=0x7b;wela=0;delay(10);}void main(){uchar A,B,C,i,adresult;floatwela=1;P0=0x7f;//开ADCSwela=0;while(1){wr=1;_nop_();wr=0;_nop_();wr=1;_nop_();for(i=0;i<10;i++){display(A,B,C);}P1=0Xff;rd=1;_nop_();rd=0;_nop_();rd=1;adresult=P1;// =(adresult*5)/256;A=adresult/256;B=adresult%256/16;C=adresult%256%16;}LCD1602显示#include<reg52.h>#define uchar unsigned charsbit lcden=P3^4; //使能端sbit lcdrs=P3^5;//写数据，写命令控制端//sbit lcdrw=P3^6;#define lcd P0void delay(uchar z) //延时函数{uchar x,y;for(x=z;x>0;x--)for(y=120;y>0;y--);}void write_data(uchar Data)//写数据{lcden=0;lcdrs=1;lcden=1;delay(10);lcd=Data;lcden=0;delay(10);}void write_commend(uchar com) //写命令{lcden=0;lcdrs=0;lcden=1;delay(10);lcd=com;lcden=0;delay(10);}void initial() //初始化函数、{write_commend(0x01);//清屏write_commend(0x38);write_commend(0x0c);write_commend(0x06);}void main(){uchar i,j;uchar fei[]="wudian";uchar benfei[]="jia you!" ;// lcdrw=0;initial();// while(1);write_commend(0x80);// write_data('f');// write_data('e');// write_data('i');// write_data('f');// write_data('e');// write_data('i');// write_data('f');// write_data('l');for(j=0;j<6;j++)write_data(fei[j]);write_commend(0xc2);for(i=0;i<11;i++)write_data(benfei[i]);}1602显示AD转换结果#include<reg52.h>#define uchar unsigned charsbit lcden=P3^4; //使能端sbit lcdrs=P3^5;//写数据，写命令控制端//sbit lcdrw=P3^6;#define lcd P0void delay(uchar z) //延时函数{uchar x,y;for(x=z;x>0;x--)for(y=120;y>0;y--);}void write_data(uchar Data)//写数据{lcden=0;lcdrs=1;lcden=1;delay(10);lcd=Data;lcden=0;delay(10);}void write_commend(uchar com) //写命令{lcden=0;lcdrs=0;lcden=1;delay(10);lcd=com;lcden=0;delay(10);}void initial() //初始化函数、{write_commend(0x01);//清屏write_commend(0x38);write_commend(0x0c);write_commend(0x06);}void main(){uchar i,j;uchar fei[]="wudian";uchar benfei[]="jia you!" ;// lcdrw=0;initial();// while(1);write_commend(0x80);// write_data('f');// write_data('e');// write_data('i');// write_data('f');// write_data('e');// write_data('i');// write_data('f');// write_data('l');for(j=0;j<6;j++)write_data(fei[j]);write_commend(0xc2);for(i=0;i<11;i++)write_data(benfei[i]);}直流电机#include<reg51.h>#define uchar unsigned charsbit wr=P3^6;sbit csda=P3^2;sbit s1=P3^4;//加速//sbit s2=P3^5;//减速sbit wela=P2^7;sbit dula=P2^6;uchar num2,num1,n,A2,A3; uchar k=5;uchar code shumaguan[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07}; uchar code shudu[5]={0x00,0x0f,0x8f,0xf0,0xff};void delay(uchar z){uchar x,y;for(x=z;x>0;x--)for(y=120;y>0;y--);}void display(uchar shi,uchar ge);void initial();void main(){uchar num=0;initial();csda=0;wr=0;P0=0x00;while(1){wr=0;if(s1==0){delay(10);if(s1==0)num++;P0=shudu[num];if(s1==0);delay(10);if(num==4){num=0;P0=0x00;}}}}void initial(){TMOD=0X01;TH0=0x3c;//50msTL0=0xb0;EA=1;ET0=1;TR0=1;IT0=1;EX0=1;}void T0_time() interrupt 1{num2++;}void INT0_count() interrupt 0 {num1++;if(num2==20){n=num1/k;A2=n/10;A3=n%10;display(A2,A3);EA=0;}}void display(uchar shi,uchar ge) {dula=1;P0=0x73;dula=0;P0=0xff;wela=1;P0=0x77;wela=0;delay(10);dula=1;P0=shumaguan[shi];dula=0;P0=0xff;wela=1;P0=0x7d;wela=0;delay(10);dula=1;P0=shumaguan[ge];dula=0;P0=0xff;wela=1;P0=0x7e;wela=0;delay(10);}。