szhong.c

本文件包含了使用C语言编写单片机的各种入门程序

#include<reg51.h>
sbit sda=P0^2;
sbit scl=P0^3;

int second,minute,hour;
code char led[16]={0x11,0xD7,0x32,0x92, /* 0 1 2 3 4 */
                   0xD4,0x98,0x18,0xD3,0x10,0x90, /* 5 6 7 8 9 */
                   0x50,0x1C,0x39,0x16,0x38,0x78};/* A B C D E F*/

shift(int t)
{ 
  int i,led1;
  led1=led[t];
  scl=0;
  for(i=0;i<8;i++)
  { 
    if(led1&0x80)sda=1;else sda=0;
	scl=1;
	scl=0;
	sda=0;
	led1=led1<<1;
	}
  }



 void display()
 {
  shift(second%10);
  shift(second/10);
  shift(0xff);
  shift(minute%10);
  shift(minute/10);
  shift(0xff);
  shift(hour%10);
  shift(hour/10);
  }

 void delay(int t)
 { int k;
   for(;t>0;t--)
   for(k=0;k<200;k++);
   }

 void main()
 {
  
  second=0;
  minute=0;
  hour=0;
  while(1)
 { if(second>=59)
  { second=0;
      if(minute>=59)
	  {minute=0;


	
	   if(hour>=23) 
	   hour=0;
	   else hour=hour+1;
	   }
	   else minute=minute+1;
	 } 
	 else second=second+1;
	display();
	delay(300);
	
	 }

	 }