鍵盤掃描函數，顯示函數都沒問題，都測試過了，就主函數那一塊，一直調試不出來，要實現的功能就是由鍵盤輸入，比如說輸入2345，就在鍵盤上分別按2345鍵，然后由數碼管顯示出來

#include<reg52.h>

#define uchar unsigned char

#define uint unsigned int

sbit wela=P2^7;

sbit dula=P2^6;

uchar temp,num,num1,bitnum=0,i,flag;

uint value,temp1=1;

uchar keybuffer[4];

uchar code table[]={

0x3f,0x06,0x5b,0x4f,

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

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

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

void delay(x)

{

uint a,b;

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

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

}

void display(uint num)

{

uchar ge,shi,bai,qian;

ge=num%10;

shi=num%100/10;

bai=num%1000/100;

qian=num/1000;

wela=1;

P0=0xf7;

wela=0;

dula=1;

P0=table[ge];

dula=0;

delay(5);

wela=1;

P0=0xfb;

wela=0;

dula=1;

P0=table[shi];

dula=0;

delay(5);

wela=1;

P0=0xfd;

wela=0;

dula=1;

P0=table[bai];

dula=0;

delay(5);

wela=1;

P0=0xfe;

wela=0;

dula=1;

P0=table[qian];

dula=0;

delay(5);

}

uchar keyscan()

{

P1=0xfe;

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

delay(5);

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

temp=P1;

switch(temp)

{

case 0xee:num=1;flag=1;

break;

case 0xde:num=2;flag=1;

break;

case 0xbe:num=3;flag=1;

break;

case 0x7e:num=4;flag=1;

break;

}

while(temp!=0xf0)

{

temp=P1;

temp=temp&0xf0;

}

}

}

P1=0xfd;

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

delay(5);

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

temp=P1;

switch(temp)

{

case 0xed:num=5;flag=1;

break;

case 0xdd:num=6;flag=1;

break;

case 0xbd:num=7;flag=1;

break;

case 0x7d:num=8;flag=1;

break;

}

while(temp!=0xf0)

{

temp=P1;

temp=temp&0xf0;

}

}

}

P1=0xfb;

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

delay(5);

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

temp=P1;

switch(temp)

{

case 0xeb:num=9;flag=1;

break;

case 0xdb:num=10;flag=1;

break;

case 0xbb:num=11;flag=1;

break;

case 0x7b:num=12;flag=1;

break;

}

while(temp!=0xf0)

{

temp=P1;

temp=temp&0xf0;

}

}

}

P1=0xf7;

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

delay(5);

temp=P1;

temp=temp&0xf0;

while(temp!=0xf0)

{

temp=P1;

switch(temp)

{

case 0xe7:num=13;flag=1;

break;

case 0xd7:num=14;flag=1;

break;

case 0xb7:num=15;flag=1;

break;

case 0x77:num=16;flag=1;

break;

}

while(temp!=0xf0)

{

temp=P1;

temp=temp&0xf0;

}

}

}

return num;

}

void main()

{

while(1)

{

while(num1<10&bitnum<4)

{

num1=keyscan();

keybuffer[bitnum]=num1;

if(flag==1)

{

bitnum++;

flag=0;

}

}

for(i=0;i<bitnum;i++)

{

value=keybuffer[bitnum-i]*temp1+value;

temp1=temp1*10;

}   

display(value);

}

}