led_tables.c

/*
Copyright 2017 Fred Sundvik

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "led_tables.h"

// clang-format off

#ifdef USE_CIE1931_CURVE
// Lightness curve using the CIE 1931 lightness formula
// Generated by the python script provided in http://jared.geek.nz/2013/feb/linear-led-pwm
const uint8_t CIE1931_CURVE[256] PROGMEM = {
    0,   1,   1,   1,   1,   1,   1,   1,   1,   1,   2,   2,   2,   2,   2,   2,
    2,   2,   2,   3,   3,   3,   3,   3,   3,   3,   3,   4,   4,   4,   4,   4,
    4,   4,   5,   5,   5,   5,   5,   6,   6,   6,   6,   6,   7,   7,   7,   7,
    7,   8,   8,   8,   8,   9,   9,   9,   9,  10,  10,  10,  11,  11,  11,  12,
   12,  12,  13,  13,  13,  14,  14,  14,  15,  15,  15,  16,  16,  17,  17,  17,
   18,  18,  19,  19,  20,  20,  21,  21,  22,  22,  23,  23,  24,  24,  25,  25,
   26,  26,  27,  27,  28,  29,  29,  30,  30,  31,  32,  32,  33,  34,  34,  35,
   36,  36,  37,  38,  38,  39,  40,  41,  41,  42,  43,  44,  45,  45,  46,  47,
   48,  49,  50,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,
   63,  64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  76,  77,  78,  79,
   80,  81,  83,  84,  85,  86,  88,  89,  90,  91,  93,  94,  95,  97,  98, 100,
  101, 102, 104, 105, 107, 108, 109, 111, 112, 114, 115, 117, 119, 120, 122, 123,
  125, 126, 128, 130, 131, 133, 135, 136, 138, 140, 142, 143, 145, 147, 149, 150,
  152, 154, 156, 158, 160, 162, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181,
  183, 186, 188, 190, 192, 194, 196, 198, 201, 203, 205, 207, 209, 212, 214, 216,
  219, 221, 223, 226, 228, 231, 233, 235, 238, 240, 243, 245, 248, 250, 253, 255
};
#endif

// clang-format on