Apa102HD.ino

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#include <Arduino.h>
#include <FastLED.h>
#include <lib8tion.h>
 
#define NUM_LEDS  20
// uint8_t DATA_PIN, uint8_t CLOCK_PIN,
 
#define STRIP_0_DATA_PIN 1
#define STRIP_0_CLOCK_PIN 2
#define STRIP_1_DATA_PIN 3
#define STRIP_1_CLOCK_PIN 4
 
 
CRGB leds_hd[NUM_LEDS] = {0};  // HD mode implies gamma.
CRGB leds[NUM_LEDS] = {0};     // Software gamma mode.
 
// This is the regular gamma correction function that we used to have
// to do. It's used here to showcase the difference between APA102HD
// mode which does the gamma correction for you.
CRGB software_gamma(const CRGB& in) {
    CRGB out;
    // dim8_raw are the old gamma correction functions.
    out.r = dim8_raw(in.r);
    out.g = dim8_raw(in.g);
    out.b = dim8_raw(in.b);
    return out;
}
 
void setup() {
    delay(500); // power-up safety delay
    // Two strips of LEDs, one in HD mode, one in software gamma mode.
    FastLED.addLeds<APA102HD, STRIP_0_DATA_PIN, STRIP_0_CLOCK_PIN, RGB>(leds_hd, NUM_LEDS);
    FastLED.addLeds<APA102,   STRIP_1_DATA_PIN, STRIP_1_CLOCK_PIN, RGB>(leds, NUM_LEDS);
}
 
uint8_t wrap_8bit(int i) {
    // Module % 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 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_hd[i] = c;  // The APA102HD leds do their own gamma correction.
        CRGB c_gamma_corrected = software_gamma(c);
        leds[i] = c_gamma_corrected;  // Set the software gamma corrected
                                      // values to the other strip.
    }
    FastLED.show();  // All leds are now written out.
    delay(8);  // Wait 8 milliseconds until the next frame.
}