Working FastLED Hyperion HDMI powered Sketch

#include "FastLED.h"

// How many leds in your strip?
#define NUM_LEDS 240

// For led chips like Neopixels, which have a data line, ground, and power, you just
// need to define DATA_PIN.  For led chipsets that are SPI based (four wires - data, clock,
// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN
#define DATA_PIN 12
//#define CLOCK_PIN 13

#define COLOR_ORDER GRB

// Adalight sends a "Magic Word" (defined in /etc/boblight.conf) before sending the pixel data
uint8_t prefix[] = {'A', 'd', 'a'}, hi, lo, chk, i;

// Baudrate, higher rate allows faster refresh rate and more LEDs (defined in /etc/boblight.conf)
#define serialRate 500000

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() {
      // Uncomment/edit one of the following lines for your leds arrangement.
      // FastLED.addLeds<TM1803, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<TM1804, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<TM1809, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<WS2811, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<WS2812, DATA_PIN, RGB>(leds, NUM_LEDS);
         FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
      // FastLED.addLeds<UCS1903, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<UCS1903B, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<GW6205, DATA_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<GW6205_400, DATA_PIN, RGB>(leds, NUM_LEDS);

      // FastLED.addLeds<WS2801, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<SM16716, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<LPD8806, RGB>(leds, NUM_LEDS);

      // FastLED.addLeds<WS2801, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<SM16716, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
      // FastLED.addLeds<LPD8806, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);

        // initial RGB flash
        LEDS.showColor(CRGB(255, 0, 0));
        delay(500);
        LEDS.showColor(CRGB(0, 255, 0));
        delay(500);
        LEDS.showColor(CRGB(0, 0, 255));
        delay(500);
        LEDS.showColor(CRGB(0, 0, 0));

        Serial.begin(serialRate);
        Serial.print("Ada\n"); // Send "Magic Word" string to host

}

void loop() {
  // wait for first byte of Magic Word
  for(i = 0; i < sizeof prefix; ++i) {
    waitLoop: while (!Serial.available()) ;;
    // Check next byte in Magic Word
    if(prefix[i] == Serial.read()) continue;
    // otherwise, start over
    i = 0;
    goto waitLoop;
  }

  // Hi, Lo, Checksum

  while (!Serial.available()) ;;
  hi=Serial.read();
  while (!Serial.available()) ;;
  lo=Serial.read();
  while (!Serial.available()) ;;
  chk=Serial.read();

  // if checksum does not match go back to wait
  if (chk != (hi ^ lo ^ 0x55))
  {
    i=0;
    goto waitLoop;
  }

  memset(leds, 0, NUM_LEDS * sizeof(struct CRGB));
  // read the transmission data and set LED values
  for (uint8_t i = 0; i < NUM_LEDS; i++) {
    byte r, g, b;
    while(!Serial.available());
    r = Serial.read();
    while(!Serial.available());
    g = Serial.read();
    while(!Serial.available());
    b = Serial.read();
    leds[i].r = r;
    leds[i].g = g;
    leds[i].b = b;
  }
  // shows new values
 FastLED.show();
}