#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
void delay10ms();
void delay(uint t);
void display(uint num,uchar weishu);
uchar keyscan();
sbit wei=P2^7;
sbit duan=P2^6;
uchar code weima[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
uchar code duanma[]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x98,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xff};
void main()
{
while(1)
{
if(keyscan()!=16)
display(keyscan(),1);
}
}
void delay(uint t)
{
while(t--)
;
}
void display(uint num,uchar weishu)
{ uchar i;
while(1)
{
for(i=0;i<weishu;i++)
{
P0=0xff; //很重要,用来每次显示前的各段清除
duan=1;
duan=0;
P0=weima;
wei=1;
wei=0;
if(num<=9)
P0=duanma[num];
else if(num<=99)
{
switch (i)
{
case 0: P0=duanma[num/10];break;
case 1: P0=duanma[num%10];break;
}
}
else if(num<=999)
{ switch (i)
{ case 0: P0=duanma[num/100];break;
case 1: P0=duanma[num/10%10];break;
case 2: P0=duanma[num%10]; break;
}
}
else if(num<=9999)
{
switch (i)
{case 0: P0=duanma[num/1000];break;
case 1: P0=duanma[num/100%10];break;
case 2: P0=duanma[num/10%10];break;
case 3: P0=duanma[num%10];break;
}
}
duan=1;
duan=0;
delay(300);
}
}
}
void delay10ms()
{
unsigned char i,j;
for(i=20;i>0;i--)
for(j=248;j>0;j--);
}
uchar keyscan()
{ uchar templ,temph,key;
P3=0x0f;
temph=P3;
if(temph!=0x0f)
{
delay10ms();
temph=P3;
if(temph!=0x0f)
{
temph=P3;
P3=0xf0;
templ=P3;
while(P3!=0xf0);
key=templ|temph;
switch (key)
{
case 01111110 : return 0;break;
case 10111110 : return 1;break;
case 11011110 : return 2;break;
case 11101110 : return 3;break;
case 01111101 : return 4;break;
case 10111101 : return 5;break;
case 11011101 : return 6;break;
case 11101101 : return 7;break;
case 01111011 : return 8;break;
case 10111011 : return 9;break;
case 11011011 : return 10;break;
case 11101011 : return 11;break;
case 01110111 : return 12;break;
case 10110111 : return 13;break;
case 11010111 : return 14;break;
case 11100111 : return 15;break;
}
}
}
return 16;
}
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