#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define ulong unsigned long
//這三個引腳參考資料
sbit E=P2^7; //1602使能引腳
sbit RW=P2^6; //1602讀寫引腳
sbit RS=P2^5; //1602數據/命令選擇引腳
void Delay_1ms(uint i)
{
uint x,j;
for(j=0;j<i;j++)
for(x=0;x<=148;x++);
}
void delay()
{
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}
bit Busy(void)//狀態判斷
{
bit busy_flag = 0;
RS = 0;
RW = 1;
E = 1;
delay();
 busy_flag = (bit)(P0 & 0x80); 
E = 0;
return busy_flag;
}
void wcmd(uchar del) // 功能 : 1602命令函數
{
while(Busy());
RS = 0;
RW = 0;
E = 0;
delay();
P0 = del;
delay();
E = 1;
delay();
E = 0;
}
void wdata(uchar del) //功能 : 1602寫數據函數
{
while(Busy());
RS = 1;
RW = 0;
E = 0;
delay();
P0 = del;
delay();
E = 1;
delay();
E = 0;
}
void L1602_init(void) // 功能 : 1602初始化
{
wcmd(0x38);
Delay_1ms(5);
wcmd(0x38);
Delay_1ms(5);
wcmd(0x38);
Delay_1ms(5);
wcmd(0x38);
wcmd(0x08);
wcmd(0x0c);
wcmd(0x04);
wcmd(0x01);
}
void L1602_char(uchar hang,uchar lie,char sign)
{
uchar a;
if(hang == 1) a = 0x80;
if(hang == 2) a = 0xc0;
a = a + lie - 1;
wcmd(a);
wdata(sign);
}
void L1602_string(uchar hang,uchar lie,uchar *p)
{
uchar a,b=0;
if(hang == 1)
a = 0x80;
if(hang == 2)
a = 0xc0;
a = a + lie - 1;
while(1)
{
wcmd(a++);
b++;
if((*p == '\0')||(b==16)) break;
wdata(*p);
p++;
}
}
uchar Keyscan()
{
uchar num,temp;
while(1)
{
P3=0xfe;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay();
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xee:num=0;
break;
case 0xde:num=1;
break;
case 0xbe:num=2;
break;
case 0x7e:num=3;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay();
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xed:num=4;
break;
case 0xdd:num=5;
break;
case 0xbd:num=6;
break;
case 0x7d:num=7;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay();
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xeb:num=8;
break;
case 0xdb:num=9;
break;
case 0xbb:num=10;
break;
case 0x7b:num=11;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay();
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:num=12;
break;
case 0xd7:num=13;
break;
case 0xb7:num=14;
break;
case 0x77:num=15;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
}
}
void Main(void)
{
uchar i=6,j=0;
uchar SLED[6]={0}; //讀出的鍵值
ulong Key_Value;
ulong code6wei = 0x123456; //16進制6位數
ulong codebijiao = 0;
L1602_init();
L1602_string(1,1," The code is:");
while(1)
{
Key_Value=10;
Key_Value = Keyscan();
if(Key_Value < 10)
L1602_char(2,i,Key_Value + 48);
else
L1602_char(2,i,Key_Value + 87);
codebijiao = codebijiao | (Key_Value <<((5-j)*4));
i++;
j++;
Delay_1ms(300);
if(j==6)
{
if(codebijiao == code6wei)
{
wcmd(0x01);
L1602_string(1,1,"right!!!");
L1602_string(2,1,"welcome back!!!");
while(1);
}
else
{
wcmd(0x01);
L1602_string(1,1,"wrong!!!");
L1602_string(2,1,"Input afresh!!!");
Delay_1ms(2000);
j = 0;
i = 6;
wcmd(0x01);
L1602_string(1,1," The code is:");
}
}
}
}

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