[嵌入式]基于51单片机的简易4位密码锁（液晶1602显示）

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit rs=P3^5;
sbit lcden=P3^4;
sbit dula=P2^6;
sbit wela=P2^7;
uchar new1,new2,new3,new4;
uchar number[]="1234";
uchar password[]="4321";
uchar cuowu[]="Error";
uchar zhengque[]="right";
uchar kaisuo[]="open";
uchar jinzhi[]="wait a minute";
uchar temp,key,wei,wanbi,allow,times,reset;
void delay(uint i)        //延时
{
	uint m,n;
	for(m=i;m>0;m--)
	for(n=114;n>0;n--);
}
void write_com(uchar com)        //写指令
{
	P0=com;
	rs=0;
	lcden=1;
	delay(10);
	lcden=0;
}
void write_dat(uchar dat)        //写数据
{
	P0=dat;
	rs=1;
	lcden=1;
	delay(10);
	lcden=0;
}
void init()            //初始化
{
	dula=0;
	wela=0;            //关数码管
	write_com(0x38);     
	write_com(0x0c);
	write_com(0x06);
}
void getkey()        //矩阵按键
{
	{	
    P3=0xfe;
    temp=P3;
    temp=temp&0xf0;
    if(temp!=0xf0)
    {
      delay(10);
      if(temp!=0xf0)
      {
        temp=P3;
        switch(temp)
        {

          case 0xbe:
               key=1;wei++;
               break;

          case 0x7e:
               key=2;wei++;
               break;
				}
				while(temp!=0xf0)        //弹起
				{
          temp=P3;
          temp=temp&0xf0;
        }
			  switch(key){
				  case 1:write_dat(number[0]);break;        //按键后密码显示在液晶上
				  case 2:write_dat(number[1]);break;
				}
			}
		}
	}
	P3=0xfd;
  temp=P3;
  temp=temp&0xf0;
  if(temp!=0xf0)
  {
    delay(10);
    if(temp!=0xf0)
    {
      temp=P3;
      switch(temp)
      {
				
        case 0xbd:
             key=3;wei++;
             break;

        case 0x7d:
             key=4;wei++;
             break;
       }
		    while(temp!=0xf0)
       {
         temp=P3;
         temp=temp&0xf0;
       }
			 
		   switch(key){
			   case 3:write_dat(number[2]);;break;
			   case 4:write_dat(number[3]);;break;
			 }
		 }
	 }
	P3=0xfb;
  temp=P3;
  temp=temp&0xf0;
  if(temp!=0xf0)
  {
    delay(10);
    if(temp!=0xf0)
    {
      temp=P3;
      switch(temp)
      {
        case 0xbb:
             wanbi=1;wei=5;
             break;
      }
		while(temp!=0xf0)
       {
         temp=P3;
         temp=temp&0xf0;
			 }
		 }
	 }
		switch(wei){        //分配输入值
		  case 1:new1=key;break;
		  case 2:new2=key;break;
		  case 3:new3=key;break;
		  case 4:new4=key;break;
			case 5:;break;
		}
	}
void getkey1()
{
	P3=0xfb;
  temp=P3;
  temp=temp&0xf0;
  if(temp!=0xf0)
  {
    delay(10);
    if(temp!=0xf0)
      {
        temp=P3;
        switch(temp)
        {
          case 0x7b:
               reset=1;            //重置值
               break;
        }
				while(temp!=0xf0)
         {
           temp=P3;
           temp=temp&0xf0;
				 }
			 }
		 }
	 }
void yenzheng()
{
	unsigned char a;
	if((new1==4)&(new2==3)&(new3==2)&(new4==1))      //校验密码
		allow=1;
	if(allow==1)
		{
			wanbi=0;
			write_com(0x80+8);                   //在输入的密码后面显示
			for(a=0;a<5;a++){
				write_dat(zhengque[a]);        //显示right
				delay(10);
			}
			delay(400);
			write_com(0xc0);
			for(a=0;a<4;a++){
				write_dat(kaisuo[a]);        //显示open
		  }
	  }
		else
		{
			times++;
			write_com(0x80+8);
		  for(a=0;a<5;a++){
		    write_dat(cuowu[a]);        //显示error
			  delay(10);
			}
			while(reset==0)   
			{
			  getkey1();
			}
			if(reset==1)        //重置输入密码
			{
				reset=0;
				wei=0;
				wanbi=0;
				write_com(0x01);
				init();
			}
		}
	}
void main()
{
	uchar a;
	uchar b;
	uchar c;
	init();
	while(1)
	{
		while(wanbi==0)
		{
		  getkey();
		}
	  yenzheng();
		if(times==3)
		{
	    TMOD=0x10;            //定时器T1
	    TR1=1;                //开T1
      TH1=0x28;
	    TL1=0x00;
			delay(200);
	    write_com(0x80);
      for(a=0;a<13;a++)
      write_dat(jinzhi[a]);        //显示等一分钟
	    while(1)
	    {
		    if(TF1==1)
		    {
		    	b++;
		    	TH1=0x28;
	        TL1=0x00;
		    	TF1=0;
		    }
		    if(b==250)        //15秒
		    {
					b=0;
					c++;
					if(c==4)        //60秒
					{
		    	  c=0;
						times=0;
		    	  write_com(0x01);
					  break;
					}
				}
			}
		}
	}
}