含protues仿真及C语言程序的简单加法器

#include

sbit P3_7=P3^7;

#define uchar unsigned char

#define unit unsigned int

uchar

table[11]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};

uchar code num[8]={0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x40};

code

uchar idata com1,com2,a,b,c,m,n;

void delay()

{

uchar j ;

for(j=0;j<1;j++)

{

TH0=0xfc;

TL0=0x18;

TR0=1;

while(!TF0);

TF0=0;

}

}

key_scan()

{

uchar com;

uchar i;

com1=0x00;

com2=0x00;

delay();

P2=0x07;

if(P2!=0x07)

{

com1=P2;

P2=0x78;

com2=P2;

}

P2=0x07;

while(P2!=0x07);

com=com1|com2;

switch(com)

{

case 0x3b:i=1; break;

case 0x3d:i=2; break;

case 0x3e:i=3; break;

case 0x5b:i=4; break;

case 0x5d:i=5; break;

case 0x5e:i=6; break;

case 0x6b:i=7; break;

case 0x6d:i=8; break;

case 0x6e:i=9; break;

case 0x73:i=0; break;

case 0x75:P0=num[0];jia();break;

case 0x76:song();i=c;break;

}

return(i);

}

jia()

{

b=key_scan();

P0=num[0] ;

P1=table[b];

}

song()

{

c=a+b;

}

void main()

{

TMOD=0x01;

while(1)

{

if(P3_7==0)P0=num[0];

P2=0x07;

while(P2!=0x07)

{

a=key_scan();

if(a<10)

{

P0=num[1] ;

P1=table[a];

}

else

{

while(1)

{

m=a/10;

n=a%10;

P0=num[1] ;

P1=table[m];

delay();

P0=num[2] ;

P1=table[n];

if(P3_7==0)break ;

}

P0=num[0];

}

}

}

}