util/rgblight_breathing_table_calc.c

   1 //
   2 // calculate rgblight_effect_breathe_table[] values
   3 //
   4 // this is host program for quantum/rgblight.c:void rgblight_effect_breathing();
   5 //
   6 // example:
   7 //  $ edit util/rgblight_breathing_table_calc.c
   8 //  $ cc -o util/rgblight_breathing_table_calc util/rgblight_breathing_table_calc.c
   9 //  $ ./util/rgblight_breathing_table_calc > keyboards/KEYBOARD_NAME/keymaps/KEYMAP_NAME/rgblight_breathe_table.h
  10 //
  11 #include <stdio.h>
  12 #include <math.h>
  13 #include <stdint.h>
  14
  15 /// customize breeathing effect part ///////////////////////////
  16 #define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1 to 2.7
  17 #define RGBLIGHT_EFFECT_BREATHE_MAX    255   // 0 to 255
  18 ////////////////////////////////////////////////////////////////
  19
  20 int main(void) {
  21     int pos, step;
  22     int table[256];
  23     for (pos = 0; pos < 256; pos ++ ) {
  24         table[pos] = (uint8_t)(
  25               (exp(sin((pos/255.0)*M_PI))- RGBLIGHT_EFFECT_BREATHE_CENTER/M_E)
  26               * (RGBLIGHT_EFFECT_BREATHE_MAX/(M_E-1/M_E))
  27               );
  28     }
  29     printf("#ifndef RGBLIGHT_EFFECT_BREATHE_TABLE\n");
  30     printf("#define RGBLIGHT_EFFECT_BREATHE_TABLE\n\n");
  31     printf("const uint8_t rgblight_effect_breathe_table[] PROGMEM = {\n");
  32     printf("  /* #define RGBLIGHT_EFFECT_BREATHE_CENTER   %.2f */\n", RGBLIGHT_EFFECT_BREATHE_CENTER);
  33     printf("  /* #define RGBLIGHT_EFFECT_BREATHE_MAX      %d */\n", RGBLIGHT_EFFECT_BREATHE_MAX);
  34
  35     for (int s = 0, step = (1<<s); s < 3 ; s += 1, step = (1<<s) ) {
  36         printf("\n #if RGBLIGHT_BREATHE_TABLE_SIZE == %d\n",
  37                s == 0 ? 256:(s== 1 ? 128: 64));
  38         for (pos = 0; pos < 256; pos += step ) {
  39             printf("  0x%x%s", table[pos], (pos+step)>=256?"":"," );
  40             if ((pos+step) % 8 == 0)
  41                 printf("\n");
  42         }
  43         printf(" #endif /* %d bytes table */\n", s == 0 ? 256:(s== 1 ? 128: 64));
  44     }
  45     printf("};\n");
  46     printf("\nstatic const int table_scale = 256/sizeof(rgblight_effect_breathe_table);\n");
  47     printf("\n#endif /* RGBLIGHT_EFFECT_BREATHE_TABLE */\n");
  48     return 0;
  49 }