#include <reg51.h>
#include <intrins.h>
#include <stdio.h>
#define uchar unsigned char 
#define uint unsigned int

uchar seg_table[17]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,
                     0x6F,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
uchar led_buffer[8]={1,2,3,4,5,6,7,8};
uchar led_x=0;
uchar scan_code=0x01;

delay_ms(int ms)
{uchar i;
 uint  j;
 for(j=2*ms;j>0;j--) 
  for(i=250;i>0;i--);
 
}


void display_led_buf()
{
  
  P1=~scan_code;
  P0=seg_table[led_buffer[led_x]];
  
  delay_ms(5);
  led_x++;
  if (led_x>5) led_x=0;
  scan_code<<=1;
  if (scan_code>0x20) scan_code=1;
}

delay_s(int s)
{uchar i;
 uint  j;
 for(j=198*s;j>0;j--) 
   display_led_buf();
 
}
void led_num_x(uchar x , uchar num)
{
     led_buffer[5-x]=num;
}
void led_num(long int x)
{uchar i;
 
 sprintf(led_buffer,"%6ld",x);
 for(i=0;i<6;i++)
   { led_buffer[i]-='0';
   if(led_buffer[i]>0x80) led_buffer[i]=16;
   }
}
void led_clear()
{ uchar i;
    for (i=0;i<7;i++)
	led_buffer[i]=16;
}
void main()
{
  uchar i=0; led_clear();
  while (1)
  {
    led_num(i); 
//    led_num_x(i,i);
    delay_s(1);
	i++;
	i%=9;
    
  }
}