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//4*4键盘检测程序,按下键后相应的代码显示在数码管上

#include

sbit beep=P2^3;

sbit dula=P2^6;

sbit wela=P2^7;

unsigned char i=100;

unsigned char j,k,temp,key;

void delay(unsigned char i)

{

for(j=i;j>0;j--)

for(k=125;k>0;k--);

}

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,

0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

display(unsigned char num)

{

P0=table[num];

//    P0=0xff;

dula=1;

dula=0;

P0=0xc0;

wela=1;

wela=0;

}

void main()

{

dula=0;

wela=0;

while(1)

{

P3=0xfe;

temp=P3;

temp=temp&0xf0;

if(temp!=0xf0)

{

delay(10);

if(temp!=0xf0)

{

temp=P3;

switch(temp)

{

case 0xee:

key=0;

break;

case 0xde:

key=1;

break;

case 0xbe:

key=2;

break;

case 0x7e:

key=3;

break;

}

while(temp!=0xf0)

{

temp=P3;

temp=temp&0xf0;

beep=0;

}

beep=1;

display(key);

// P0=table[key];

/*        P0=0xff;

dula=1;

while(i--);

dula=0;

P0=0xc0;

wela=1;

wela=0;

dula=0;

wela=0;

P0=0xff;

dula=1;

dula=0;

P0=0xc5;

wela=1;

wela=0; */

P1=0xfe;

}

}

P3=0xfd;

temp=P3;

temp=temp&0xf0;

if(temp!=0xf0)

{

delay(10);

if(temp!=0xf0)

{

temp=P3;

switch(temp)

{

case 0xed:

key=4;

break;

case 0xdd:

key=5;

break;

case 0xbd:

key=6;

break;

case 0x7d:

key=7;

break;

}

while(temp!=0xf0)

{

temp=P3;

temp=temp&0xf0;

beep=0;

}

beep=1;

display(key);

/*         P0=table[key];

dula=1;

//   while(100--);

dula=0;

P0=0xc0;

wela=1;

wela=0;

*/       P1=0xfc;

}

}

P3=0xfb;

temp=P3;

temp=temp&0xf0;

if(temp!=0xf0)

{

delay(10);

if(temp!=0xf0)

{

temp=P3;

switch(temp)

{

case 0xeb:

key=8;

break;

case 0xdb:

key=9;

break;

case 0xbb:

key=10;

break;

case 0x7b:

key=11;

break;

}

while(temp!=0xf0)

{

temp=P3;

temp=temp&0xf0;

beep=0;

}

beep=1;

display(key);

/*    P0=table[key];

dula=1;

//   while(100--);

dula=0;

P0=0xc0;

wela=1;

wela=0;

*/     P1=0xf8;

}

}

P3=0xf7;

temp=P3;

temp=temp&0xf0;

if(temp!=0xf0)

{

delay(10);

if(temp!=0xf0)

{

temp=P3;

switch(temp)

{

case 0xe7:

key=12;

break;

case 0xd7:

key=13;

break;

case 0xb7:

key=14;

break;

case 0x77:

key=15;

break;

}

while(temp!=0xf0)

{

temp=P3;

temp=temp&0xf0;

beep=0;

}

beep=1;

display(key);

/*       P0=table[key];

dula=1;

//      while(100--);

dula=0;

P0=0xc0;

wela=1;

wela=0;

*/     P1=0xf0;

}

}

}

}