void
setup( void )
{
  pinMode( P1_4, OUTPUT );
  pinMode( P1_5, OUTPUT );
  digitalWrite( P1_4, 0 );
  digitalWrite( P1_5, 0 );
}

enum { OFF, LEFT, RIGHT } which;

void
loop( void )
{
  if( which == OFF )
  {
    digitalWrite( P1_4, 1 );
    digitalWrite( P1_5, 0 );
    which = LEFT;
  }
  else if( which == LEFT )
  {
    digitalWrite( P1_4, 0 );
    digitalWrite( P1_5, 1 );
    which = RIGHT;
  }
  else
  {
    digitalWrite( P1_4, 0 );
    digitalWrite( P1_5, 0 );
    which = OFF;
  }
  delay( 2000 );
}