源碼：#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
#define KEY P3 //鍵盤輸入端
#define No_key 20 //無按鍵時返回值
#define lcddata P2 //1602的數(shù)據(jù)輸入端口
sbit lcden=P1^2;
sbit lcdrs=P1^0; //0輸入指令，1輸入數(shù)據(jù)
sbit lcdrw=P1^1; //0向LCD寫入數(shù)據(jù)或指令，1從LCD讀取信息
sbit light_red=P1^3;
sbit light_green=P1^4;
uchar j; //用來統(tǒng)計輸入個數(shù)的全局變量
uchar aa; //用來在定時器中計數(shù)的全局變量
uchar code table[]="Hello! ";
uchar code table1[]="OK! ";
uchar code table3[]="YOU ARE WRONG!";
uchar code table2[]="ENTER PLEASE:";
uchar code key_table[]={
1,2,3,10,
4,5,6,11,
7,8,9,12,
0,13,14,15};
uchar password[]={0,9,5,8,3,4}; //設定初始密碼
uchar save[6]; //保存輸入數(shù)據(jù)
uchar conflag;
uchar startflag;
uchar lockflag;
void delay(uint z);
void wright_com(uchar com); //寫命令函數(shù)
void wright_data(uchar date); //寫數(shù)據(jù)函數(shù)
void init();
void display_OK(); //顯示OK
void delete();
uchar keyscan();
void enter_code(uchar t); //輸入密碼，并把輸入的數(shù)據(jù)存入數(shù)組中
void confirm(); //輸入密碼逐一對比
void succeed_an();
void fail_an();
void lockkey();
void reset();
void display_enter();
void display_wrong();
void main(void)
{
uchar temp;
init();
while(1)
{
if(lockflag) //輸入錯誤，才會鎖存
{
temp=keyscan();
if(temp != No_key)
{
aa=0; //重新計時
if(temp==10)
{
lcdrw=0; //清屏
lcden=0;
wright_com(0x01);
reset();
light_red=1;
startflag=1; //開始標志置位
}
}
}
else
{
temp=keyscan();
if(temp != No_key)
{
if(temp==10)
{
lcdrw=0; //清屏
lcden=0;
wright_com(0x01);
reset();
startflag=1; //開始標志置位
}
if(startflag)
{
enter_code(temp);
if(temp==13)
{
confirm();
if(conflag)
{
succeed_an();
}
else
{
fail_an();
}
}
if(temp==14)
{
delete();
}
}
}
}
}
}
/*顯示enter*/
void display_enter()
{
uchar num;
wright_com(0x80);
for(num=0;num<13;num++)
{
wright_data(table2[num]);
}
}
/*顯示OK*/
void display_ok()
{
uchar num;
wright_com(0x80);
for(num=0;num<13;num++)
{
wright_data(table1[num]);
}
}
/*顯示錯誤*/
void display_wrong()
{
uchar num;
wright_com(0x80);
for(num=0;num<14;num++)
{
wright_data(table3[num]);
}
}
void delete()
{
wright_com(0x80+0x40+j);
wright_data(' ');
save[--j]=0;
wright_com(0x80+0x40+j);
}
/*復位各種變量*/
void reset()
{
uchar num;
display_enter();
wright_com(0x80+0x40);
for(num;num<6;num++)
{
save[num]=0;
wright_data(' ');
}
wright_com(0x80+0x40);
lockflag=0;
conflag=0;
j=0;
}
void succeed_an()
{
light_green=0;
display_ok();
delay(1000);
light_green=1;
}
void fail_an()
{
display_wrong();
lockkey();
}
void lockkey()
{
lockflag=1;
}
void enter_code(uchar t)
{
if(t>=0&&t<10)
{
if(j==0)
{
wright_com(0x80+0x40);
wright_data('*');
}
else
{
wright_data('*');
}
save[j++]=t;
}
}
void confirm()
{
uchar k;
for(k=0;k<6;k++)
{ if(password[k]!=save[k])
{
break;
}
}
if(k==6)
{
conflag=1;
}
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
if(lockflag)
{
aa++;
light_red=0;
if(aa>=60)
{
aa=0;
light_red=1;
lockflag=0;
}
}
}
void init()
{
uchar num;
TMOD=1;
ET0=1;
EA=1;
TR0=1;
lcdrw=0;
lcden=0;
wright_com(0x38);
wright_com(0x0c);
wright_com(0x01);
wright_com(0x80);
for(num=0;num<9;num++)
{
wright_data(table[num]);
delay(1);
}
}
void wright_com(uchar com)
{
lcdrs=0;
lcddata=com;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
void wright_data(uchar date)
{
lcdrs=1;
lcddata=date;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
/*鍵盤掃描 逐行掃描*/
uchar keyscan()
{
uchar temp;
uchar num=No_key;
KEY=0xfe;
temp=KEY;
temp=temp&0xf0;
while(temp !=0xf0)
{
delay(5);
temp=KEY;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=KEY;
switch(temp)
{
case 0xee:num=1;
break;
case 0xde:num=2;
break;
case 0xbe:num=3;
break;
case 0x7e:num=10;
break;
}
while(temp!=0xf0)
{
temp=KEY;
temp=temp&0xf0;
}
}
}
KEY=0xfd;
temp=KEY;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=KEY;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=KEY;
switch(temp)
{
case 0xed:num=4;
break;
case 0xdd:num=5;
break;
case 0xbd:num=6;
break;
case 0x7d:num=11;
break;
}
while(temp!=0xf0)
{
temp=KEY;
temp=temp&0xf0;
}
}
}
KEY=0xfb;
temp=KEY;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=KEY;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=KEY;
switch(temp)
{
case 0xeb:num=7;
break;
case 0xdb:num=8;
break;
case 0xbb:num=9;
break;
case 0x7b:num=12;
break;
}
while(temp!=0xf0)
{
temp=KEY;
temp=temp&0xf0;
}
}
}
KEY=0xf7;
temp=KEY;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=KEY;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=KEY;
switch(temp)
{
case 0xe7:num=0;
break;
case 0xd7:num=13;
break;
case 0xb7:num=14;
break;
case 0x77:num=15;
break;
}
while(temp!=0xf0)
{
temp=KEY;
temp=temp&0xf0;
}
}
}
return num;
}
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