//
// This program lights up one LED after another from P1.0 to P1.7, then P2.0 to P2.7,
// and then it reverses. It looks like the light is bouncing from one side to the other.
//

unsigned long int lights;
bool go_left = true;

void
setup()
{                
  P1DIR = 0b11111111;
  P2DIR = 0b11111111;
  lights = 1;
}

void
loop()
{
  if( lights & 1 )
     go_left = true;
  else if( lights & (1<<15) )
     go_left = false;

  if( go_left )
    lights <<= 1;
  else
    lights >>= 1;

  P1OUT = lights;
  P2OUT = lights >> 8;
  delay( 50 );
}