//
// This program controls the brightness of 14 LEDs on a scale from 0 to 13.
// As the pattern moves right to left (or clockwise if the LEDs are arranged
// in a circle, the brightest LED is at the front, and subsequent LEDs are
// each one step dimmer, like the tail of a comet.
//

unsigned char values[14] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };
unsigned int index = 0;

void
setup()
{
  P1DIR = 0b11111111;
  P2DIR = 0b111111;
  P1OUT = 0;
  P2OUT = 0;
}

void
loop()
{
  int lights = 0;
  for( int x = 0; x < 128; x++ )
  {
    lights = 0;
    for( int y = 0; y < 14; y++ )
    {
      if( x < 1<<values[y] )
      {
        lights |= 1 << y;
      }
    }
    P1OUT = lights;
    P2OUT = lights >> 8;
  }
  values[index]--;
  values[index++] &= 0xF;
  index %= 14;
}