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libraries/FastLED/examples/BlinkParallel/BlinkParallel.ino

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+
+/// @file    BlinkParallel.ino
+/// @brief   Shows parallel usage of WS2812 strips. Blinks once for red, twice for green, thrice for blue.
+/// @example BlinkParallel.ino
+
+#include "FastLED.h"
+
+// How many leds in your strip?
+#define NUM_LEDS 256
+
+// Demo of driving multiple WS2812 strips on different pins
+
+// Define the array of leds
+CRGB leds[NUM_LEDS];  // Yes, they all share a buffer.
+
+void setup() {
+    Serial.begin(115200);
+    //FastLED.addLeds<WS2812, 5>(leds, NUM_LEDS);  // GRB ordering is assumed
+    FastLED.addLeds<WS2812, 1>(leds, NUM_LEDS);  // GRB ordering is assumed
+    FastLED.addLeds<WS2812, 2>(leds, NUM_LEDS);  // GRB ordering is assumed
+    FastLED.addLeds<WS2812, 3>(leds, NUM_LEDS);  // GRB ordering is assumed
+    FastLED.addLeds<WS2812, 4>(leds, NUM_LEDS);  // GRB ordering is assumed
+    delay(1000);
+}
+
+void fill(CRGB color) {
+  for (int i = 0; i < NUM_LEDS; i++) {
+    leds[i] = color;
+  }
+}
+
+void blink(CRGB color, int times) {
+  for (int i = 0; i < times; i++) {
+    fill(color);
+    FastLED.show();
+    delay(500);
+    fill(CRGB::Black);
+    FastLED.show();
+    delay(500);
+  }
+}
+
+void loop() { 
+  // Turn the LED on, then pause
+  blink(CRGB(8,0,0), 1);  // blink once for red
+  blink(CRGB(0,8,0), 2);  // blink twice for green
+  blink(CRGB(0,0,8), 3);  // blink thrice for blue
+
+  delay(50);
+
+
+
+  // now benchmark
+  uint32_t start = millis();
+  fill(CRGB(8,8,8));
+  FastLED.show();
+  uint32_t diff = millis() - start;
+
+  Serial.print("Time to fill and show for non blocking (ms): ");
+  Serial.println(diff);
+
+  delay(50);
+
+  start = millis();
+  fill(CRGB(8,8,8));
+  FastLED.show();
+  FastLED.show();
+
+  diff = millis() - start;
+  Serial.print("Time to fill and show for 2nd blocking (ms): ");
+  Serial.println(diff);
+}