//sourxe: https://editor.soulmatelights.com/gallery/1979-twinkles

#include "FastLED.h"
#define DATA_PIN 2
#define BRIGHTNESS 255
#define NUM_LEDS 256
#define LED_COLS 16
#define LED_ROWS 16
#define LED_TYPE    WS2812B
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];
//#define FRAMES_PER_SECOND 60
const uint8_t kMatrixWidth = 16;
const uint8_t kMatrixHeight = 16;

const bool    kMatrixSerpentineLayout = false;


void setup() {
  FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, NUM_LEDS); //setCorrection(TypicalLEDStrip);
  //FastLED.addLeds<LED_TYPE,DATA_PIN,CLK_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(BRIGHTNESS);
 //Serial.begin(115200);
}

void loop() 
{
  static byte offset = 0;
  
  EVERY_N_MILLISECONDS(200) {
    offset++;
  }
  
  random16_set_seed(23579);
  double a = millis();
  for (int i = 0; i < NUM_LEDS; i++) {
    byte hue = sin8((random16() / 256) + inoise8(random16() / 256 + a / 32) + i * 4);
    byte bright = sin8(random16() / 256 + inoise8(random16() / 256 + a / 32) + a / 16);
    nblend(leds[i], CHSV(hue + offset, 255, bright), 128);
  }
  delay(60);
      FastLED.show();

}
 
uint16_t XY( uint8_t x, uint8_t y)
{
  uint16_t i;
  if( kMatrixSerpentineLayout == false) {
    i = (y * kMatrixWidth) + x;
  }
  if( kMatrixSerpentineLayout == true) {
    if( y & 0x01) {
      // Odd rows run backwards
      uint8_t reverseX = (kMatrixWidth - 1) - x;
      i = (y * kMatrixWidth) + reverseX;
    } else {
      // Even rows run forwards
      i = (y * kMatrixWidth) + x;
    }
  }
  return i;
}