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#include<reg52.h>
typedef unsigned char u8;
typedef unsigned int u16;
u8 which,buff[6];
u8 s_1,s_2,s_3,s_4,s_5,s_6;
sbit DI=P3^6;
sbit LED=P3^7;
u8 code right[]={1,2,3,4,5,6};
u8 code distab[]={
0xc0,0xF9,0xA4,0xB0,0x99,
0x92,0x82,0xF8,0x80,0x90,
0x88,0x83,0xC6,0xA1,0x86,
0x8E,0xFF,0x0C,0x89,0x7F,0xBF};
void delayms(u8 xms)
{
u16 i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}
void di()
{
DI=0;
delayms(500);
DI=1;
delayms(500);
}
u8 conn()
{
if((buff[0]==right[0])&&(buff[1]==right[1])&&(buff[2]==right[2])&&
(buff[3]==right[3])&&(buff[4]==right[4])&&(buff[5]==right[5]))
return 1;
else return 0;
}
void display(u8 num)
{
if(which>0)
switch(which)
{
case 1:if(num==21)which=0;s_1=num;if(num==20)which=0;buff[0]=s_1; break;
case 2:if(num==21)which=1;s_2=num;if(num==20)which=1;buff[1]=s_2; break;
case 3:if(num==21)which=2;s_3=num;if(num==20)which=2;buff[2]=s_3; break;
case 4:if(num==21)which=3;s_4=num;if(num==20)which=3;buff[3]=s_4; break;
case 5:if(num==21)which=4;s_5=num;if(num==20)which=4;buff[4]=s_5; break;
case 6:if(num==21)which=5;s_6=num;if(num==20)which=5;buff[5]=s_6; break;
case 7: which=6;
if(num==21)
{
if(conn()==0)
{
di();di();di();
LED=1;
}
else
{
LED=0;delayms(500);delayms(500);LED=1;
}
which=0;
}
break;
default: which=6; break;
}
else di();
}
void dis()
{
switch(which)
{
case 1:P0=distab[s_1]; P2=0x80;delayms(5); P0=0xff; P2=0x00; break;
case 2:P0=distab[s_1]; P2=0x40;delayms(5); P0=0xff;
P0=distab[s_2]; P2=0x80;delayms(5); P0=0xff; P2=0x00; break;
case 3:P0=distab[s_1]; P2=0x20;delayms(5); P0=0xff;
P0=distab[s_2]; P2=0x40;delayms(5); P0=0xff;
P0=distab[s_3]; P2=0x80;delayms(5); P0=0xff; P2=0x00; break;
case 4:P0=distab[s_1]; P2=0x10;delayms(5); P0=0xff;
P0=distab[s_2]; P2=0x20;delayms(5); P0=0xff;
P0=distab[s_3]; P2=0x40;delayms(5); P0=0xff;
P0=distab[s_4]; P2=0x80;delayms(5); P0=0xff; P2=0x00; break;
case 5:P0=distab[s_1]; P2=0x08;delayms(5); P0=0xff;
P0=distab[s_2]; P2=0x10;delayms(5); P0=0xff;
P0=distab[s_3]; P2=0x20;delayms(5); P0=0xff;
P0=distab[s_4]; P2=0x40;delayms(5); P0=0xff;
P0=distab[s_5]; P2=0x80;delayms(5); P0=0xff; P2=0x00; break;
case 6:P0=distab[s_1]; P2=0x04;delayms(5); P0=0xff;
P0=distab[s_2]; P2=0x08;delayms(5); P0=0xff;
P0=distab[s_3]; P2=0x10;delayms(5); P0=0xff;
P0=distab[s_4]; P2=0x20;delayms(5); P0=0xff;
P0=distab[s_5]; P2=0x40;delayms(5); P0=0xff;
P0=distab[s_6]; P2=0x80;delayms(5); P0=0xff; P2=0x00; break;
}
}
void matrixkeyscan() //matrix矩陣
{
u8 temp,key; //temp臨時變量
P1=0xfe; //將第一行電平置低，其余行全為高
temp=P1; //讀取P3口當前狀態的置賦予臨時變量temp，用于后面計算
temp=temp&0xf0; //判斷temp的高四位是否有0，如果temp的高四位有0，那么與運算后
//結果必然不等于0xf0;temp的高四位實際上是矩陣鍵盤的4個列線
//從而通過temp與0xf0"&"運算后的結果是否為0xf0來判斷第一行是否
//有按鍵按下
if(temp!=0xf0) //“temp&0xf0”的結果，如果temp不等于0xf0，說明有鍵被按下
{
delayms(10);
temp=P1; //重新讀一次P3口數據
temp=temp&0xf0; //重新進行一次與運算
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xee: key=0; which+=1; break;
case 0xde: key=1; which+=1; break;
case 0xbe: key=2; which+=1; break;
case 0x7e: key=3; which+=1; break;
}
while(temp!=0xf0) //等待按鍵釋放
{
temp=P1;
temp=temp&0xf0;
}
display(key);
}
}
P1=0xfd;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
delayms(10);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xed: key=4; which+=1;break;
case 0xdd: key=5; which+=1;break;
case 0xbd: key=6; which+=1;break;
case 0x7d: key=7; which+=1;break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
display(key);
}
}
P1=0xfb;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
delayms(10);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xeb: key=8; which+=1;break;
case 0xdb: key=9; which+=1;break;
// case 0xbb: key=10; which+=1;break;
// case 0x7b: key=11; which+=1;break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
display(key);
}
}
P1=0xf7;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
delayms(10);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xe7: key=20; break;
case 0xd7: key=21; which+=1; break;
// case 0xb7: key=14; which+=1;break;
// case 0x77: key=15; which+=1;break;
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