Reduce the firmware size by 1500 bytes when rgblight_effect_breathing() is enabled.

quantum/rgblight.c

@@ -908,11 +908,54 @@ void rgblight_task(void) {
 __attribute__ ((weak))
 const uint8_t RGBLED_BREATHING_INTERVALS[] PROGMEM = {30, 20, 10, 5};
 
+#ifdef RGBLIGHT_EFFECT_BREATHE_USE_TABLE
+__attribute__ ((weak))
+const uint8_t rgblight_effect_breathe_table[] PROGMEM = {
+  0x22,  0x23,  0x25,  0x26,  0x28,  0x29,  0x2a,  0x2c,
+  0x2d,  0x2f,  0x30,  0x32,  0x33,  0x35,  0x36,  0x38,
+  0x3a,  0x3b,  0x3d,  0x3e,  0x40,  0x42,  0x43,  0x45,
+  0x47,  0x49,  0x4a,  0x4c,  0x4e,  0x50,  0x51,  0x53,
+  0x55,  0x57,  0x59,  0x5a,  0x5c,  0x5e,  0x60,  0x62,
+  0x64,  0x66,  0x68,  0x69,  0x6b,  0x6d,  0x6f,  0x71,
+  0x73,  0x75,  0x77,  0x79,  0x7b,  0x7d,  0x7f,  0x81,
+  0x83,  0x85,  0x87,  0x89,  0x8a,  0x8c,  0x8e,  0x90,
+  0x92,  0x94,  0x96,  0x98,  0x9a,  0x9c,  0x9e,  0x9f,
+  0xa1,  0xa3,  0xa5,  0xa7,  0xa8,  0xaa,  0xac,  0xae,
+  0xaf,  0xb1,  0xb3,  0xb4,  0xb6,  0xb8,  0xb9,  0xbb,
+  0xbc,  0xbe,  0xbf,  0xc1,  0xc2,  0xc3,  0xc5,  0xc6,
+  0xc7,  0xc9,  0xca,  0xcb,  0xcc,  0xcd,  0xce,  0xd0,
+  0xd1,  0xd2,  0xd2,  0xd3,  0xd4,  0xd5,  0xd6,  0xd7,
+  0xd7,  0xd8,  0xd9,  0xd9,  0xda,  0xda,  0xdb,  0xdb,
+  0xdb,  0xdc,  0xdc,  0xdc,  0xdc,  0xdc,  0xdd,  0xdd,
+  0xdd,  0xdd,  0xdc,  0xdc,  0xdc,  0xdc,  0xdc,  0xdb,
+  0xdb,  0xdb,  0xda,  0xda,  0xd9,  0xd9,  0xd8,  0xd7,
+  0xd7,  0xd6,  0xd5,  0xd4,  0xd3,  0xd2,  0xd2,  0xd1,
+  0xd0,  0xce,  0xcd,  0xcc,  0xcb,  0xca,  0xc9,  0xc7,
+  0xc6,  0xc5,  0xc3,  0xc2,  0xc1,  0xbf,  0xbe,  0xbc,
+  0xbb,  0xb9,  0xb8,  0xb6,  0xb4,  0xb3,  0xb1,  0xaf,
+  0xae,  0xac,  0xaa,  0xa8,  0xa7,  0xa5,  0xa3,  0xa1,
+  0x9f,  0x9e,  0x9c,  0x9a,  0x98,  0x96,  0x94,  0x92,
+  0x90,  0x8e,  0x8c,  0x8a,  0x89,  0x87,  0x85,  0x83,
+  0x81,  0x7f,  0x7d,  0x7b,  0x79,  0x77,  0x75,  0x73,
+  0x71,  0x6f,  0x6d,  0x6b,  0x69,  0x68,  0x66,  0x64,
+  0x62,  0x60,  0x5e,  0x5c,  0x5a,  0x59,  0x57,  0x55,
+  0x53,  0x51,  0x50,  0x4e,  0x4c,  0x4a,  0x49,  0x47,
+  0x45,  0x43,  0x42,  0x40,  0x3e,  0x3d,  0x3b,  0x3a,
+  0x38,  0x36,  0x35,  0x33,  0x32,  0x30,  0x2f,  0x2d,
+  0x2c,  0x2a,  0x29,  0x28,  0x26,  0x25,  0x23,  0x22
+};
+#endif
+
 void rgblight_effect_breathing(animation_status_t *anim) {
   float val;
 
   // http://sean.voisen.org/blog/2011/10/breathing-led-with-arduino/
+#ifndef RGBLIGHT_EFFECT_BREATHE_USE_TABLE
   val = (exp(sin((anim->pos/255.0)*M_PI)) - RGBLIGHT_EFFECT_BREATHE_CENTER/M_E)*(RGBLIGHT_EFFECT_BREATHE_MAX/(M_E-1/M_E));
+#else
+  val = pgm_read_byte(&rgblight_effect_breathe_table[anim->pos]);
+#endif
+
   rgblight_sethsv_noeeprom_old(rgblight_config.hue, rgblight_config.sat, val);
   anim->pos = (anim->pos + 1) % 256;
 }

quantum/rgblight.h

@@ -86,8 +86,12 @@ enum RGBLIGHT_EFFECT_MODE {
 
 #define RGBLIGHT_MODES (RGBLIGHT_MODE_last-1)
 
+// #define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1-2.7
+
 #ifndef RGBLIGHT_EFFECT_BREATHE_CENTER
-#define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1-2.7
+#define RGBLIGHT_EFFECT_BREATHE_USE_TABLE
+// this is same effect #define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85
+//  see TOP/util/breathing_table_calc.c
 #endif
 
 #ifndef RGBLIGHT_EFFECT_BREATHE_MAX

util/breathing_table_calc.c

@@ -0,0 +1,25 @@
+//
+// this is host program for quantum/rgblight.c:void rgblight_effect_breathing();
+//
+#include <stdio.h>
+#include <math.h>
+#include <stdint.h>
+
+#define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85
+#define RGBLIGHT_EFFECT_BREATHE_MAX 255   // 0-255
+
+int main(void) {
+    int pos;
+    printf("#ifdef RGBLIGHT_EFFECT_BREATHE_USE_TABLE\n");
+    printf("__attribute__ ((weak))\n");
+    printf("const uint8_t rgblight_effect_breathe_table[] PROGMEM = {\n");
+    for (pos = 0; pos < 256; pos ++ ) {
+        printf("  0x%x%s",(uint8_t)( (exp(sin((pos/255.0)*M_PI)) - RGBLIGHT_EFFECT_BREATHE_CENTER/M_E)*(RGBLIGHT_EFFECT_BREATHE_MAX/(M_E-1/M_E))),pos==255?"":"," );
+        if ((pos+1) % 8 == 0)
+            printf("\n");
+    }
+    printf("};\n");
+    printf("#endif\n");
+
+    return 0;
+}