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Added optional gamma correction for light

fastled
Chris Ward 7 years ago
parent
commit
b078c8117f
1 changed files with 39 additions and 9 deletions
  1. +39
    -9
      code/espurna/light.ino

+ 39
- 9
code/espurna/light.ino View File

@ -18,12 +18,37 @@ unsigned int _lightColor[3] = {0};
my9291 * _my9291; my9291 * _my9291;
#endif #endif
#if ENABLE_GAMMA_CORRECTION
#define GAMMA_TABLE_SIZE (256)
#undef LIGHT_PWM_RANGE
#define LIGHT_PWM_RANGE (4095)
// Gamma Correction lookup table for gamma=2.8 and 12 bit (4095) full scale
const unsigned short gamma_table[GAMMA_TABLE_SIZE] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 8, 8, 9, 10, 11,
12, 13, 15, 16, 17, 18, 20, 21, 23, 25, 26, 28, 30, 32, 34, 36,
38, 40, 43, 45, 48, 50, 53, 56, 59, 62, 65, 68, 71, 75, 78, 82,
85, 89, 93, 97, 101, 105, 110, 114, 119, 123, 128, 133, 138, 143, 149, 154,
159, 165, 171, 177, 183, 189, 195, 202, 208, 215, 222, 229, 236, 243, 250, 258,
266, 273, 281, 290, 298, 306, 315, 324, 332, 341, 351, 360, 369, 379, 389, 399,
409, 419, 430, 440, 451, 462, 473, 485, 496, 508, 520, 532, 544, 556, 569, 582,
594, 608, 621, 634, 648, 662, 676, 690, 704, 719, 734, 749, 764, 779, 795, 811,
827, 843, 859, 876, 893, 910, 927, 944, 962, 980, 998,1016,1034,1053,1072,1091,
1110,1130,1150,1170,1190,1210,1231,1252,1273,1294,1316,1338,1360,1382,1404,1427,
1450,1473,1497,1520,1544,1568,1593,1617,1642,1667,1693,1718,1744,1770,1797,1823,
1850,1877,1905,1932,1960,1988,2017,2045,2074,2103,2133,2162,2192,2223,2253,2284,
2315,2346,2378,2410,2442,2474,2507,2540,2573,2606,2640,2674,2708,2743,2778,2813,
2849,2884,2920,2957,2993,3030,3067,3105,3143,3181,3219,3258,3297,3336,3376,3416,
3456,3496,3537,3578,3619,3661,3703,3745,3788,3831,3874,3918,3962,4006,4050,4095 };
#endif
#ifndef LIGHT_PWM_FREQUENCY #ifndef LIGHT_PWM_FREQUENCY
#define LIGHT_PWM_FREQUENCY (1000)
#define LIGHT_PWM_FREQUENCY (1000)
#endif #endif
#ifndef LIGHT_PWM_RANGE #ifndef LIGHT_PWM_RANGE
#define LIGHT_PWM_RANGE (255)
#define LIGHT_PWM_RANGE (255)
#endif #endif
// ----------------------------------------------------------------------------- // -----------------------------------------------------------------------------
@ -116,12 +141,17 @@ void color_temperature2array(unsigned int temperature, unsigned int * array) {
unsigned int intensity2pwm(unsigned int intensity) unsigned int intensity2pwm(unsigned int intensity)
{ {
unsigned int pwm; unsigned int pwm;
// Support integer multiples of 256 (-1) for the LIGHT_PWM_RANGE
// The divide should happen at compile time
pwm = intensity * ((LIGHT_PWM_RANGE+1) / (LIGHT_MAX_VALUE+1));
#if ENABLE_GAMMA_CORRECTION
pwm = (intensity < GAMMA_TABLE_SIZE) ? gamma_table[intensity] : PWM_RANGE;
#else
// Support integer multiples of 256 (-1) for the PWM_RANGE
// The divide should happen at compile time
pwm = intensity * ( (LIGHT_PWM_RANGE+1) / (LIGHT_MAX_VALUE+1) );
#endif
#if RGBW_INVERSE_LOGIC != 1 #if RGBW_INVERSE_LOGIC != 1
pwm = LIGHT_PWM_RANGE - pwm;
pwm = LIGHT_PWM_RANGE - pwm;
#endif #endif
return pwm; return pwm;
@ -156,9 +186,9 @@ void _lightProviderSet(bool state, unsigned int red, unsigned int green, unsigne
analogWrite(RGBW_RED_PIN, intensity2pwm(red)); analogWrite(RGBW_RED_PIN, intensity2pwm(red));
analogWrite(RGBW_GREEN_PIN, intensity2pwm(green)); analogWrite(RGBW_GREEN_PIN, intensity2pwm(green));
analogWrite(RGBW_BLUE_PIN, intensity2pwm(blue)); analogWrite(RGBW_BLUE_PIN, intensity2pwm(blue));
#if (LIGHT_PROVIDER == LIGHT_PROVIDER_RGBW)
analogWrite(RGBW_WHITE_PIN, intensity2pwm(white));
#endif
#if (LIGHT_PROVIDER == LIGHT_PROVIDER_RGBW)
analogWrite(RGBW_WHITE_PIN, intensity2pwm(white));
#endif
#endif #endif
} }


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