#include <reg51.h>
#include <stdio.h>
#define  uchar unsigned char
#define uint unsigned int
#define LED_MAX  6

uchar code seg_table[17]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,
                     0x6F,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};

uchar  led_buf[LED_MAX]={0};
uchar  led_x=0;
uchar  led_scan_code=1;

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

void scan_buf()
{
  P1=~led_scan_code;
  P0=seg_table[led_buf[led_x]];
  
//  delay_ms(5);

  led_x++;
  if (led_x>LED_MAX) led_x=0;

  led_scan_code<<=1;

  if (led_scan_code>(01<<LED_MAX)) led_scan_code=1;
  
}

void led_display(uchar x , uchar c)
{
    led_buf[LED_MAX-x]=c;
}

void led_clear()
{
  uchar i;
  for (i=0;i<LED_MAX;i++) led_buf[i]=16;
}



void led_init()
{
   ET0=1;
   EA=1;

   TL0=(65536-5000);
   TH0=(65536-5000)>>8;
   TMOD=0X01;
    
   TR0=1;
   led_clear();
}
void led_num(long x)
{
  char str[10],i; 
  char fstr[5];
   
  sprintf(fstr,"%%%dlu",LED_MAX);  
  sprintf(str,"%6lu",x);
 
  for (i=0;i<LED_MAX;i++) 
     led_display(i+1,str[LED_MAX-i-1]-'0');   
}
void main()
{
   uchar i=0;

   
   led_init();
   led_clear();
   led_num(123356);
   while (1)

   
   {  
     
   }

}


void isr_timer0() interrupt 1
{
  
   scan_buf();
   TL0=(65536-5000);
   TH0=(65536-5000)>>8;
}