按键控制数码管显示数字加减

#include

#define uchar unsigned char

#define uint unsigned int

uint num=0,num1=0;

sbit key1=P3^0;

sbit key2=P3^1;

sbit key3=P3^2;

sbit key4=P3^3;

uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; void delayms(uint x)

{

uint i,j;

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

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

}

void display(uint num)

{

uint shi,ge;

shi=num/10;

ge=num%10;

P0=table[shi];

P1=0xfd;

delayms(5);

P0=table[ge];

P1=0xfe;

delayms(5);

}

void keyscan()

{

if(key1==0)

{

delayms(10);

if(key1==0)

{num1++;

if(num1==60)

num1=0;

while(!key1)

display(num1);

}

}

if(key2==0)

{

delayms(10);

if(key2==0)

{

if(num1==0)

num1=60;

num1--;

while(!key2) display(num1);

}

}

if(key3==0)

{

delayms(10);

if(key3==0)

{num1=0;

while(!key3)

display(num1);}

}

if(key4==0)

{

delayms(10);

if(key4==0)

{TR0=~TR0;

while(!key4)

display(num1);}

}

}

void main()

{

TMOD=0x01;

TH0=(65536-45872)/256; TL0=(65536-45872)%256; EA=1;

ET0=1;

while(1)

{

keyscan();

display(num1);

}

}

void T()interrupt 1

{

TH0=(65536-45872)/256; TL0=(65536-45872)%256; num++;

if(num==20) {num1++;

num=0;

if(num1==60)

num1=0;} }