/*
* Code d'exemple pour une LED RGB (+16 millions couleurs) avec correction Gamma.
*/
/* Broches */
const byte PIN_LED_R = 9;
const byte PIN_LED_G = 10;
const byte PIN_LED_B = 11;
/* ----- BEGIN OF AUTO-GENERATED CODE - DO NOT EDIT ----- */
#ifndef GAMMA_H_
#define GAMMA_H_
/* Dependency for PROGMEM */
#include <avr/pgmspace.h>
/** Gamma correction table in flash memory. */
static const uint8_t PROGMEM _gamma[] = {
0, 21, 28, 34, 39, 43, 46, 50, 53, 56, 59, 61, 64, 66, 68, 70,
72, 74, 76, 78, 80, 82, 84, 85, 87, 89, 90, 92, 93, 95, 96, 98,
99, 101, 102, 103, 105, 106, 107, 109, 110, 111, 112, 114, 115, 116, 117, 118,
119, 120, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
136, 137, 138, 139, 140, 141, 142, 143, 144, 144, 145, 146, 147, 148, 149, 150,
151, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159, 160, 160, 161, 162, 163,
164, 164, 165, 166, 167, 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175,
175, 176, 177, 178, 178, 179, 180, 180, 181, 182, 182, 183, 184, 184, 185, 186,
186, 187, 188, 188, 189, 190, 190, 191, 192, 192, 193, 194, 194, 195, 195, 196,
197, 197, 198, 199, 199, 200, 200, 201, 202, 202, 203, 203, 204, 205, 205, 206,
206, 207, 207, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215,
215, 216, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, 223, 223, 224,
224, 225, 225, 226, 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 231, 232,
232, 233, 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239, 239, 240,
240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 247, 247, 248,
248, 249, 249, 249, 250, 250, 251, 251, 252, 252, 253, 253, 254, 254, 255, 255
};
/**
* Apply gamma correction to the given sample.
*
* @param x The input 8 bits sample value.
* @return The output 8 bits sample value with gamma correction.
*/
static inline uint8_t gamma(uint8_t x) {
return pgm_read_byte(&_gamma[x]);
}
#endif /* GAMMA_H_ */
/* ----- END OF AUTO-GENERATED CODE ----- */
// Fonction setup(), appelée au démarrage de la carte Arduino
void setup() {
// Initialise les broches
pinMode(PIN_LED_R, OUTPUT);
pinMode(PIN_LED_G, OUTPUT);
pinMode(PIN_LED_B, OUTPUT);
displayColor(0, 0, 0);
}
// Fonction loop(), appelée continuellement en boucle tant que la carte Arduino est alimentée
void loop() {
/* Code de démonstration */
for (int i = 0; i < 256; i++) {
displayColor(i & 255, 0, 0);
delay(10);
}
delay(1000);
for (int i = 0; i < 256; i++) {
displayColor(gamma(i & 255), 0, 0);
delay(10);
}
delay(1000);
}
/** Affiche une couleur */
void displayColor(byte r, byte g, byte b) {
// Assigne l'état des broches
// Version cathode commune
//analogWrite(PIN_LED_R, r);
//analogWrite(PIN_LED_G, g);
//analogWrite(PIN_LED_B, b);
// Version anode commune
analogWrite(PIN_LED_R, ~r);
analogWrite(PIN_LED_G, ~g);
analogWrite(PIN_LED_B, ~b);
}