#define FORCE_SOFTWARE_SPI
//#define FORCE_SOFTWARE_PINS
#include "FastLED.h"
#define NUM_LEDS 30
#define PIN 4
#define serialRate 115200

// 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;

// initialise LED-array
CRGB diody[NUM_LEDS];

void setup()
{
  FastLED.addLeds<WS2812B, PIN, GRB>(diody, NUM_LEDS);
  //  FastLED.addLeds<WS2812B, PIN, BGR>(diody, NUM_LEDS);
  // initial RGB flash
  LEDS.showColor(CRGB(255, 0, 0));
  delay(1000);
  LEDS.showColor(CRGB(0, 255, 0));
  delay(1000);
  LEDS.showColor(CRGB(0, 0, 255));
  delay(1000);
  LEDS.showColor(CRGB(0, 0, 0));

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

}

void loop() {

  LEDS.showColor(CRGB(0, 0, 0));
  // 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(diody, 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();
    diody[i].r = r;
    diody[i].g = g;
    diody[i].b = b;
  }
  // shows new values
  FastLED.show();

}