实现矩阵键盘控制数码管第一位显示0-f

#include <REGX52.H>

#include <INTRINS.H>

sbit WE = P2^7;

sbit DU = P2^6;

tabel[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71};

unsigned char Keyvalue;

void Delay(xms) //@11.0592MHz

{

unsigned char i, j;

while(xms)

{

_nop_();

i = 2;

j = 199;

do

{

while (--j);

} while (--i);

xms--;

}

}

void main()

{

WE = 1;

P0 = 0xfe;

WE = 0;

DU = 1;

P0=0x00;

while(1)

{

if(P3!=0xf0)

{

Delay(10);

P3=0xf0;

if(P3!=0xf0)

{

switch(P3)

{

case 0xe0:Keyvalue=0;break;

case 0xd0:Keyvalue=1;break;

case 0xb0:Keyvalue=2;break;

case 0x70:Keyvalue=3;break;

}

P3=0x0f;

switch(P3)

{

case 0x0e:Keyvalue = Keyvalue;break;

case 0x0d:Keyvalue = Keyvalue+4;break;

case 0x0b:Keyvalue = Keyvalue+8;break;

case 0x07:Keyvalue = Keyvalue+12;break;

}

P0=tabel[Keyvalue];

}

}

}

}

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