WS2811 / Fast_Spi2 / Random4

/*  Random block of 4 leds, very fast.
/*  Kelvin Mead Aug/14

#include <FastSPI_LED2.h>

#define NUM_LEDS 320

CRGB leds[NUM_LEDS];

  long previousMillis = 0;        // will store last time LED was updated
  long interval = 100;            // interval at which to blink (milliseconds)
  int bright = 255;               // easy adjustable brightness

void setup() {
  delay(2000);
  LEDS.setBrightness(bright);
  LEDS.addLeds<WS2811, 13>(leds, NUM_LEDS);
}



void loop() {

    unsigned long currentMillis = millis();
  if(currentMillis - previousMillis > interval) {
  previousMillis = currentMillis;

//put programs in here to be controlled by the delay time
// program name (r, g, b, speed)
random4(51, 102, 153, 50);

  LEDS.setBrightness(bright);
  } // end timed loop
} // end void loop

  void random4(int cred, int cblu, int cgrn, int cinterval) {
    interval = cinterval;
      // clear all
      memset(leds, 0,  NUM_LEDS * sizeof(struct CRGB));
  int random4 = random(NUM_LEDS);

    leds[random4].setRGB(cred, cblu, cgrn);
    leds[random4-1].setRGB(cred, cblu, cgrn);
    leds[random4-2].setRGB(cred, cblu, cgrn);
    leds[random4-3].setRGB(cred, cblu, cgrn);
  LEDS.show();
  }