#include "Adafruit_NeoPixel.h"
#define PIN 6
enum {
  WIDTH=16,
  HEIGHT=16,
  N=WIDTH*HEIGHT*3
};
Adafruit_NeoPixel strip = Adafruit_NeoPixel(WIDTH * HEIGHT,
                          PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  strip.begin();
  Serial.begin(115200);
  strip.setPixelColor(0, strip.Color(10,10,10));  
  strip.show(); // Funktionstest: zeige einen einzigen Pixel an
}

int counter = 0;
char buf[3*WIDTH*HEIGHT];

void loop() {
  int incomingByte = 0;
  while((Serial.available() > 0) && (incomingByte != -1)) {
    incomingByte = Serial.read();
    if (incomingByte != -1) { // Lesefehler gibt -1
      if(incomingByte == 254)
        counter = 0;
      else{
        buf[counter] = incomingByte;
        counter++;
        if (counter >= N)
          counter = 0;
      }
    }
  }
  if (counter >= N-1) {
    for (int i = 0; i < WIDTH*HEIGHT; i++) {
      strip.setPixelColor(i, strip.Color(buf[3*i], buf[3*i+1], buf[3*i+2]));
    }
    strip.show();
  }
}