下面是c语言源程序：

#include<reg52.h>

#define uint unsigned int

#define uchar unsigned char

uintled[]={0xc0,0xf9,0xa4, 0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,

0x88,0x83,0xc6,0xa1,0x86,0x8e};

uchar a,b,c,temp;

void delay7ms(void) //误差 -0.217013888891us

{

unsigned char a,b;

for(b=208;b>0;b--)

for(a=14;a>0;a--);

}

ucharkey()

{

P1=0x0f;

if(P1!=0x0f)

{

delay7ms();

if(P1!=0x0f);

P1=0xfe;

a=P1^0xfe;

switch(a)

{

case 0x80:c=0;break;

case 0x40:c=1;break;

case 0x20:c=2;break;

case 0x10:c=3;break;

}

temp=P1;

while(temp!=0xfe)

{

temp=P1;

}

}

P1=0x0f;

if(P1!=0x0f)

{

delay7ms();

if(P1!=0x0f);

P1=0xfd;

a=P1^0xfd;

switch(a)

{

case 0x80:c=4;break;

case 0x40:c=5;break;

case 0x20:c=6;break;

case 0x10:c=7;break;

}

temp=P1;

while(temp!=0xfd)

{

temp=P1;

}

}

P1=0x0f;

if(P1!=0x0f)

{

delay7ms();

if(P1!=0x0f);

P1=0xfb;

a=P1^0xfb;

switch(a)

{

case 0x80:c=8;break;

case 0x40:c=9;break;

case 0x20:c=10;break;

case 0x10:c=11;break;

}

temp=P1;

while(temp!=0xfb)

{

temp=P1;

}

}

P1=0x0f;

if(P1!=0x0f)

{

delay7ms();

if(P1!=0x0f);

P1=0xf7;

a=P1^0xf7;

switch(a)

{

case 0x80:c=12;break;

case 0x40:c=13;break;

case 0x20:c=14;break;

case 0x10:c=15;break;

}

temp=P1;

while(temp!=0xf7)

{

temp=P1;

}

}

return c;

}

void main(void)

{

while(1)

{

P2=led[b];

b=key();

}

}

希望大家多指点,谢谢！

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