const int dim[] = {0, 1, 2, 4, 8, 16, 32, 64, 128, 255};

void setup() {
  // put your setup code here, to run once:
  volatile char *dirf;
  volatile char *outf;
  volatile long i, j, x;
  dirf = 0x30;
  outf = 0x31;
  *dirf = 0xFF;

  /*while(1)
  {
    for(int i = 0; i <= 255; i++) 
    {
      OCR0A = i;  
      while (!(TIFR0 & (1 << OCF0A)));  
    }

  
    for(int i = 255; i >= 0; i--) 
    {
      OCR0A = i; 
      while (!(TIFR0 & (1 << OCF0A)));  
    }
  }*/

  while(1)
  {
    *outf = 0x00;
    delay(500);

    for(i=0; i< sizeof(dim)/sizeof(dim[0]); i++)
    {
      *outf = (dim[i]>0) ? 0x01 : 0x00;
      delay(100);
      //*outf = 0x00;
      //delay(100);
    }

    *outf = 0x01;
    delay(500);

    for(i = (sizeof(dim)/sizeof(dim[0]))-1; i>=0; i--)
    {
      *outf = (dim[i]>0) ? 0x01 : 0x00;
      delay(100);
      //*outf = 0x01;
      //delay(100);
    }


  }

  /*while(1)
  {
    for(i=0; i<=255; i++)
    {
      *outf = (i>0) ? 0x01 : 0x00;
      delay(100);
    }

    for(i=255; i>=0; i--)
    {
      *outf = (i>0) ? 0x01 : 0x00;
      delay(100);
    }
  }*/

  /*while(1)
  {
    for(i=0; i<360; i++)
    {
      x = (int)(sin(i*3.14159/180)*255);
      *outf = (x>0) ? 0x01 : 0x00;
      delay(10);
    }

    for(i=360; i>=0; i--)
    {
      x = (int)(sin(i*3.14159/180)*255);
      *outf = (x>0) ? 0x01 : 0x00;
      delay(10);
    }
  }*/
  /*while(1)
  {
    for(int i = 0; i <= 255; i++) 
    {
      set(i);
      delay(10);
    }

    for(int i = 255; i >= 0; i--) 
    {
      set(i);
      delay(10);
    }
  }

}

void set(long i)
{
  volatile char *outf;
  volatile long j;
  *outf = 0x31;
  for(j = 0; j < 255; j++)
  {
    if(j<i)
    {
      *outf |= 0x01;
    }
    else
    {
      *outf &= 0x00;
    }
    delayMicroseconds(30);
  }
}*/
}



void loop() {
  // put your main code here, to run repeatedly:
  

}