123.c

C51人机接口技术

#include "reg52.h"
unsigned char status;
bit flag;
extern  void display(unsigned char temp);
void service_int1() interrupt 2 using 2
{	  status=~P1;
		flag=1;
}
void main()
{
IP=0x04;
IE=0x84;
P1=0xff;
for(;;){
if(flag){


switch(status)	
{
case 0x01:
display(0xeb);break;
case 0x02:
display(0x4c);break;
case 0x04:
display(0x49);break;
case 0x08:
display(0x2b);break;
case 0x10:
display(0x19);break;
case 0x20:
display(0x18);break;
case 0x40:
display(0xcb);break;
case 0x80:
display(0x08);break;
default:break;	
}  


}

flag=0;
}
}