Arduino WS2812 control

Projects Programming
18 
void Adafruit_NeoPixel::begin(void) {

  if(pin == 33){
    DDRE |= (1 << PE2);
    PORTE |= (1 << PE2);  // i think this sets the pin HIGH, it should be set LOW
    begun = true;
    return;
  }
  
  if(pin >= 0) {
    pinMode(pin, OUTPUT);
    digitalWrite(pin, LOW);
  }
  begun = true;
}

That is one thing. Then there is the issue of the pinMask. I would try it like this as well

pinMask = 1 << PE2;  // non-inverted.

OK it's trial and error, but i think it should work at some point. Are you using a 16MHz clock ?