#include<iom16v.h>
void delay(void)
{
unsigned int i,j;
for(i=0;i<2000;i++)
{
   for(j=0;j<500;j++)
   ;
}
}
//=============================
void led (unsigned int i)
 { 
  PORTD=(1<<i);   
  delay(); 
  } 
void main(void)
{ 
DDRD=0xff;
PORTD=0x00;
//PORTA=0x00;

while(1)
  { unsigned int i;
  PORTD=0x00;
  delay();
  PORTD=0xff;
  delay();
 for(i=7;i>0;i--)
{ led (i);
 // PORTD=0x00;
 // delay();}
 for(i=0;i<8;i++)
  {led(i); delay();}
  }
}