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update example with more explaination

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zackees 2023-10-13 00:27:48 -07:00
parent e0c509e16a
commit 1f2f3da6e1
1 changed files with 30 additions and 16 deletions
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examples/Apa102HD/Apa102HD.ino
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@ -1,21 +1,38 @@
/// @file Apa102HD.ino
/// @brief Example showing how to use the APA102HD gamma correction.
///
/// We will draw a linear ramp between APA102HD which does it's
/// own gamma correction at the driver level, and the software
/// version of gamma correction, which used to be the status quo.
/// In this example we compare two strips of LEDs.
/// One strip is in HD mode, the other is in software gamma mode.
///
/// Why do we love gamma correction? It produces a better picture
/// that matches how our eye sees light. It's the standard lighting
/// method for your monitor or TVs for example and gives these
/// devices the range to produce very bright and very dim lights.
/// @example Apa102HD.ino
/// Each strip is a linear ramp of brightnesses, from 0 to 255.
/// Showcasing all the different brightnesses.
///
/// Why do we love gamma correction? Gamma correction more closely
/// matches how humans see light. Led values are measured in fractions
/// of max power output (1/255, 2/255, etc.), while humans see light
/// in a logarithmic way. Gamma correction converts to this eye friendly
/// curve. Gamma correction wants a LED with a high bit depth. The APA102
/// gives us the standard 3 components (red, green, blue) with 8 bits each, it
/// *also* has a 5 bit brightness component. This gives us a total of 13 bits,
/// which allows us to achieve a higher dynamic range. This means deeper fades.
///
/// Example:
/// CRGB leds[NUM_LEDS] = {0};
/// void setup() {
/// FastLED.addLeds<
/// APA102HD, // <--- This selects HD mode.
/// STRIP_0_DATA_PIN,
/// STRIP_0_CLOCK_PIN,
/// RGB
/// >(leds, NUM_LEDS);
/// }
#include <Arduino.h>
#include <FastLED.h>
#include <lib8tion.h>
#define NUM_LEDS 256
#define NUM_LEDS 20
// uint8_t DATA_PIN, uint8_t CLOCK_PIN,
#define STRIP_0_DATA_PIN 1
#define STRIP_0_CLOCK_PIN 2
@ -54,15 +71,12 @@ uint8_t wrap_8bit(int i) {
}
void loop() {
// Draw a a linear ramp of brightnesses, showcasing the difference
// between the two gamma correction modes. APA102HD should have far
// greater range of brightnesses. Gamma correction mode in software
// will have about 25% of the dimmest lights truncated to 0 brightness!
// 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++) {
// Make sure the i value is always in 8 bit range.
uint8_t brightness = wrap_8bit(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 are set to ungamma corrected values.
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.