51单片机外围器件使用的头文件代码（很详细）

#include<reg52.h> #define uchar unsigned char #define uint unsigned int //共阳极七段显示码 unsigned char code table[]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92, 0x82,0xf8,0x80,0x90,0x88,0x83, 0xc6,0xa1,0x86,0x8e}; //共阴极七段显示码 unsigned char code table[]={ 0x3f,0x06,0x5b,0x4f,0x66,0x6d, 0x7d,0x07,0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; //共阴极位选序列 unsigned char code table[]={ 0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; //共阳极位选序列 unsigned char code table[]={ 0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; unsigned char code table[]={ 0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe}; //软件复位 void soft_reset(void) { ((void(code*)(void))0x0000)(); } //200ms延时程序 void delay(void) { unsigned char m,n,s; for(m=20;m>0;m--) for(n=20;n>0;n--) for(s=248;s>0;s--); } //一秒定时子程序 void timer0() interrupt 1 { static unsigned char temp; TH0=0x3c; TL0=0xb0; temp++; if(temp==20) {} } //4*4矩阵键盘扫描，第0位扫描第一行，第1位扫描第二行。。。第4位扫描第一列，第5位扫描第二列 unsigned char KeyScan(void) { uchar temp,i,temp1=0xfe; static uchar key=0; for(i=0;i<4;i++) { P2=temp1; temp=P2&0xf0; if(temp!=0xf0) { delay10ms(); temp=P2&0xf0; if(temp!=0xf0) { switch(temp) { case 0xe0:key=4*i+0;break; case 0xd0:key=4*i+1;break; case 0xb0:key=4*i+2;break; case 0x70:key=4*i+3;break; } } } temp1=(temp1<<1)|0x01; } return key; } 或者使用下面未简化的程序 unsigned char KeyScan(void) { uchar temp; static uchar key=0; P2=0xfe; temp=P2&0xf0; if(temp!=0xf0) { delay10ms(); temp=P2&0xf0; if(temp!=0xf0) { switch(temp) { case 0xe0:key=0;break; case 0xd0:key=1;break; case 0xb0:key=2;break; case 0x70:key=3;break; } } } P2=0xfd; temp=P2&0xf0; if(temp!=0xf0) { delay10ms(); temp=P2&0xf0; if(temp!=0xf0) { switch(temp) { case 0xe0:key=4;break; case 0xd0:key=5;break; case 0xb0:key=6;break; case 0x70:key=7;break; } } } P2=0xfb; temp=P2&0xf0; if(temp!=0xf0) { delay10ms(); temp=P2&0xf0; if(temp!=0xf0) { switch(temp) { case 0xe0:key=8;break; case 0xd0:key=9;break; case 0xb0:key=10;break; case 0x70:key=11;break; } } } P2=0xf7; temp=P2&0xf0; if(temp!=0xf0) { delay10ms(); temp=P2&0xf0; if(temp!=0xf0) { switch(temp) { case 0xe0:key=12;break; case 0xd0:key=13;break; case 0xb0:key=15;break; case 0x70:key=16;break; } } } return key; }