//red[] = {};
//blue[] = {};
//grenn[] = {};

volatile unsigned int red = ((0x0ff0 & 0x1fff) | 0x0001) ;
volatile unsigned int blue = ((0x0000 & 0x1fff) | 0x0001);
volatile unsigned int green = ((0x0000 & 0x1fff) | 0x0001);
volatile unsigned int start = 0x1fff;

volatile byte i = 0;
volatile byte j = 0;
volatile unsigned int k = 1;

void setup() {
  // put your setup code here, to run once:
  TCCR2A = 0x83; // fast pwm, oc2a output, clear on match
  TCCR2B = 0x02; // no prescaler
  TIMSK2 = 0x01; // turn on overflow interrupt
  pinMode(11, OUTPUT); // set oc2a to output
  //pinMode(12, OUTPUT); // set 12 to out for testing
}

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

}

ISR(TIMER2_OVF_vect) {
  if (i == 0) {
    if ((start & k) == 0) OCR2A = 0x3f;
    else OCR2A = 0xbf;
    k <<= 1;
    if (k == 0) {
      k = 1;
      i++;
    } 
  }
  else {
    if (j == 0) {
      if ((red & k) == 0) OCR2A = 0x3f;
      else OCR2A = 0xbf;
    }
    else if (j ==  1) {
      if ((green & k) == 0) OCR2A = 0x3f;
      else OCR2A = 0xbf;
    }
    else {
      if ((blue & k) == 0) OCR2A = 0x3f;
      else OCR2A = 0xbf;
    }
    k <<= 1;
    if (k == 0) {
      k = 1;
      j++;
      if (j == 3) {
        j = 0;
        red = random(0x7fff);
        red = ((red & 0x1ff7) | 0x0001);
        //blue = ((random(0x7fff) & 0x1fff) | 0x0001);
        //green = ((random(0x7fff) & 0x1fff) | 0x0001);
        i++;
        if (i == 51) {
          i = 0;
          //red += 0x0010;
          //red = ((red & 0x1fff) | 0x0001) ;
        }
      }
    }
  }
}