first commit

libraries/FastLED/examples/Apa102/Apa102.ino

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+
+#include <Arduino.h>
+#include <FastLED.h>
+#include <lib8tion.h>
+
+#define NUM_LEDS  20
+
+#define STRIP_DATA_PIN 1
+#define STRIP_CLOCK_PIN 2
+
+CRGB leds[NUM_LEDS] = {0};     // Software gamma mode.
+
+void setup() {
+    delay(500); // power-up safety delay
+    // Two strips of LEDs, one in HD mode, one in software gamma mode.
+    FastLED.addLeds<APA102, STRIP_DATA_PIN, STRIP_CLOCK_PIN, RGB>(leds, NUM_LEDS);
+}
+
+uint8_t wrap_8bit(int i) {
+    // Modulo % operator here wraps a large "i" so that it is
+    // always in [0, 255] range when returned. For example, if
+    // "i" is 256, then this will return 0. If "i" is 257,
+    // then this will return 1. No matter how big the "i" is, the
+    // output range will always be [0, 255]
+    return i % 256;
+}
+
+void loop() {
+    // Draw a linear ramp of brightnesses to showcase the difference between
+    // the HD and non-HD mode.
+    for (int i = 0; i < NUM_LEDS; i++) {
+        uint8_t brightness = map(i, 0, NUM_LEDS - 1, 0, 255);
+        CRGB c(brightness, brightness, brightness);  // Just make a shade of white.
+        leds[i] = c;
+    }
+    FastLED.show();  // All LEDs are now displayed.
+    delay(8);  // Wait 8 milliseconds until the next frame.
+}