#include <reg52.h>typedef unsigned char u8;typedef unsigned int u16;//sbit 特殊功能位聲明：聲明某特殊功能寄存器中的一位#define key P1 //按鍵io口sbit fen=P3^0; //蜂鳴器io口sbit rs=P3^1; //LCD控制口sbit rw=P3^2;sbit e=P3^3;sbit led=P3^4; //LED燈io口//bit 位變量聲明：定義一個位變量的值u8 keyz=17,j=0,biao1=0,a=10,b=10,c=10,d=10;bit biao=0;u16 zh;u8 shu[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08, 0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};u8 zi[]={"lnput password:"};u8 num[]={"0123456789ABCDEF"};void delay(u16 i){ while(i--); }/*蜂鳴器*/void Fen(u8 a,b) //蜂鳴器發聲函數{ u8 i,j; for(i=0;i<a;i++) { for(j=0;j<100;j++) {fen=~fen;delay(b);} } }/*LCD*/void writecom(u8 com){ //LCD寫指令 rs=0; rw=0; e=0; P0=com; delay(5); e=1; e=0; }void writedat(u8 dat){ //LCD寫數據 rs=1; rw=0; e=0; P0=dat; delay(5); e=1; e=0; }void initlcd(){ //LCD初始化函數 writecom(0x38); //顯示模式設置 writecom(0x0c); writecom(0x06); }void xian(){ //LCD顯示數字函數 writedat(num[keyz]); if(a==10){a=keyz; } //對abcd，四位數的單獨賦值 else if(b==10){b=keyz;} else if(c==10){c=keyz;} else{d=keyz;} if(j!=3){j++;}biao=0;}/*鍵盤*/void Key(){u8 a=0; //矩形式鍵盤函數 if(key!=0x0f){delay(1000); if(key!=0x0f){ key=0x0f; switch(key){ case 0x07: keyz=0;biao=1;break; case 0x0b: keyz=1;biao=1;break; case 0x0d: keyz=2;biao=1;break; case 0x0e: keyz=3;biao=1;break; } key=0xf0; switch(key){ case 0x70: keyz=keyz;biao=1;break; case 0xb0: keyz=keyz+4;biao=1;break; case 0xd0: keyz=keyz+8;biao=1;break; case 0xe0: keyz=keyz+12;biao=1;break; } } while((a<50)&&(key!=0xf0)){a++;delay(10000);} } } void shi(){u8 i; // 按鍵值判斷函數 if(biao&&keyz!=15){ //判斷標志位biao是否為1，為1則有按鍵操作并且按鍵的值不等于15 writecom(0x80+0x40+j); //數字顯示位置進行累加操作 if(j<0){j=0;} //數字顯示位置邊界 switch(keyz){ //switch判斷按鍵并執行對應操作 case 0:xian(); break; case 1:xian(); break; case 2:xian(); break; case 3:xian(); break; case 4:xian(); break; case 5:xian(); break; case 6:xian(); break; case 7:xian(); break; case 8:xian(); break; case 9:xian(); break; case 10:writedat(num[keyz]); j++;biao=0;break; case 11:writedat(num[keyz]); j++;biao=0;break; case 12: biao1=0; //重置標志位biao1,上鎖 biao=0;break; case 13:writecom(0x01); delay(1000); //全屏清除 for(i=0;i<sizeof(zi);i++){ writecom(0x80+i); writedat(zi[i]); } j=0;biao=0;break; case 14: //對當前數字位刪除的操作 writedat(' '); j--; writecom(0x80+0x40+j);writedat(' '); biao=0;break; case 15: //確定按鍵 j++;biao=0;break; } } if(keyz==15){ //判斷按鍵值如果等于15，便視為按下確定鍵 writecom(0x01);delay(1000); zh=a*1000+b*100+c*10+d; //將ABCD，四位數合并并進行判斷是否為正確密碼 if(zh==1234){ //設密碼為1234 j=0; biao1=1; //將biao1標志位置1便為密碼正確 keyz=17; //使按鍵值跳出最大值15便不會循壞顯示 } else{ j=0; biao1=0; //反之密碼錯誤 keyz=17; Fen(20,200); //蜂鳴器報警 } zh=0;a=10,b=10,c=10,d=10; //重置ABCD變量 for(i=0;i<sizeof(zi);i++){ writecom(0x80+i); writedat(zi[i]); } } } void main(){u8 i; led=1; initlcd(); //LCD初始化函數 for(i=0;i<sizeof(zi);i++){ writecom(0x80+i); writedat(zi[i]); } while(1){ Key(); //定義鍵盤函數 shi(); //按鍵判斷函數，燈亮或報警 P2=shu[keyz]; //數碼管顯示當前輸入值 if(biao1==1){ led=0; //判斷標志位biao1 為1則密碼正確顯示ok writecom(0x80+0x40+10); writedat('O'); writecom(0x80+0x41+10); writedat('K'); } else if(biao1==0){led=1; //biao1為0則顯示密碼錯誤顯示no writecom(0x80+0x40+10); writedat('N'); writecom(0x80+0x41+10); writedat('O');} } }
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