51单片机矩阵键盘代码

#include

#include

#define uchar unsigned char

#define uint unsigned int

sbit dula=P2^6;

sbit wela=P2^7;

uchar code table[]={ 0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71};

void delayms(uint xms)

{

uint i,j;

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

for(j=110;j>0;j--);

}

void display(uchar num)

{

P0=table[num];

dula=1;

//P0=table[num];

dula=0;

//delayms(500);

}

void matrixkeyscan()

{

uchar temp,key;

P3=0xfe;

temp=P3;

temp=temp&0xf0;

if(temp != 0xf0)

{

delayms(10);

temp=P3;

temp=temp&0xf0;

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;

}

display(key);

}

}

P3=0xfd;

temp=P3;

temp=temp&0xf0;

if(temp != 0xf0)

{

delayms(10);

temp=P3;

temp=temp&0xf0;

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;

}

display(key);

}

}

P3=0xfb;

temp=P3;

temp=temp&0xf0;

if(temp != 0xf0)

{

delayms(10);

temp=P3;

temp=temp&0xf0;

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;

}

display(key);

}

}

P3=0xf7;

temp=P3;

temp=temp&0xf0;

if(temp != 0xf0)

{

delayms(10);

temp=P3;

temp=temp&0xf0;

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;

}

display(key);

}

}

}

void main()

{

P0=0;

dula=1;

dula=0;

P0=0xc0;

wela=1;

//P0=0xc0;

wela=0;

while(1)

{

matrixkeyscan();

}

}