#include "setup.h"
void alternate_led();
void reverse_alternate_led();
#define MAX 4
#define DELAY 300000

int main()

{
  init_port(0x21);//DDRA
  init_port(0x24);//DDRB

  while(1)
  {
    alternate_led(0,0x22);
    alternate_led(1,0x25);
    alternate_led(1,0x22);
    alternate_led(0,0x25);
    reverse_alternate_led(6,0x25);
    reverse_alternate_led(7,0x22);
    reverse_alternate_led(7,0x25);
    reverse_alternate_led(6,0x22);
  }
}


void alternate_led(long j,volatile long port)
{
    volatile long i;
    long res;
    while(j<8)
    {
      res=expo(2,j);
      out(res,port);
      for(i=0;i<DELAY;i++);
      j+=2;
    }
    out(0x00,port);
    for(i=0;i<DELAY;i++);

}

void reverse_alternate_led(long j,volatile long port)
{
    volatile long i;
    long res;
    while(j>=0)
    {
      res=expo(2,j);
      out(res,port);
      for(i=0;i<DELAY;i++);
      j-=2;
    }
    out(0x00,port);
    for(i=0;i<DELAY;i++);

}