//
// This program moves three to six lights from left to right, in such a way that if the
// LEDs are arranged in a circle, it looks like an inchworm is moving around it clockwise.
// The 16 LEDs are connected to P1.0 through P1.7 and P2.0 through P2.7.
//

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

void
inchworm( unsigned int worm )
{
  P1OUT = worm;
  P2OUT = worm >> 8;
  delay( 100 );
}

void
loop()
{
  inchworm( 0b0000000000000111 );
  inchworm( 0b0000000000001111 );
  inchworm( 0b0000000000011111 );
  inchworm( 0b0000000000111111 );
  inchworm( 0b0000000000111110 );
  inchworm( 0b0000000000111100 );
  inchworm( 0b0000000000111000 );
  inchworm( 0b0000000001111000 );
  inchworm( 0b0000000011111000 );
  inchworm( 0b0000000111111000 );
  inchworm( 0b0000000111110000 );
  inchworm( 0b0000000111100000 );
  inchworm( 0b0000000111000000 );
  inchworm( 0b0000001111000000 );
  inchworm( 0b0000011111000000 );
  inchworm( 0b0000111111000000 );
  inchworm( 0b0000111110000000 );
  inchworm( 0b0000111100000000 );
  inchworm( 0b0000111000000000 );
  inchworm( 0b0001111000000000 );
  inchworm( 0b0011111000000000 );
  inchworm( 0b0111111000000000 );
  inchworm( 0b0111110000000000 );
  inchworm( 0b0111100000000000 );
  inchworm( 0b0111000000000000 );
  inchworm( 0b1111000000000000 );
  inchworm( 0b1111000000000001 );
  inchworm( 0b1111000000000011 );
  inchworm( 0b1110000000000011 );
  inchworm( 0b1100000000000011 );
  inchworm( 0b1000000000000011 );
}