CCT blending setting

wled00/FX.h

@@ -673,6 +673,7 @@ class WS2812FX {
       paletteFade = 0,
       paletteBlend = 0,
       milliampsPerLed = 55,
+			cctBlending = 0,
       getBrightness(void),
       getMode(void),
       getSpeed(void),

wled00/FX_fcn.cpp

@@ -1152,4 +1152,5 @@ uint32_t WS2812FX::gamma32(uint32_t color)
 }
 
 WS2812FX* WS2812FX::instance = nullptr;
-int16_t Bus::_cct = -1;
+int16_t Bus::_cct = -1;
+uint8_t Bus::_cctBlend = 0;

wled00/bus_manager.h

@@ -113,6 +113,14 @@ class Bus {
     static  void setCCT(uint16_t cct) {
       _cct = cct;
     }
+		static void setCCTBlend(uint8_t b) {
+			if (b > 100) b = 100;
+			_cctBlend = (b * 127) / 100;
+			//compile-time limiter for hardware that can't power both white channels at max
+			#ifdef WLED_MAX_CCT_BLEND
+				if (_cctBlend > WLED_MAX_CCT_BLEND) _cctBlend = WLED_MAX_CCT_BLEND;
+			#endif
+		}
 
     bool reversed = false;
 
@@ -125,6 +133,7 @@ class Bus {
     bool     _needsRefresh = false;
     uint8_t  _autoWhiteMode = 0;
     static int16_t _cct;
+		static uint8_t _cctBlend;
 
     uint32_t autoWhiteCalc(uint32_t c) {
       if (_autoWhiteMode == RGBW_MODE_MANUAL_ONLY) return c;
@@ -300,19 +309,29 @@ class BusPwm : public Bus {
       cct = (approximateKelvinFromRGB(c) - 1900) >> 5;
     }
 
+		//0 - linear (CCT 127 = 50% warm, 50% cold), 127 - additive CCT blending (CCT 127 = 100% warm, 100% cold)
+		uint8_t ww, cw;
+		if (cct       < _cctBlend) ww = 255;
+		else ww = ((255-cct) * 255) / (255 - _cctBlend);
+
+		if ((255-cct) < _cctBlend) cw = 255;
+		else cw = (cct       * 255) / (255 - _cctBlend);
+
+		ww = (w * ww) / 255; //brightness scaling
+		cw = (w * cw) / 255;
+
     switch (_type) {
       case TYPE_ANALOG_1CH: //one channel (white), relies on auto white calculation
         _data[0] = w;
         break;
       case TYPE_ANALOG_2CH: //warm white + cold white
-        // perhaps a non-linear adjustment would be in order. need to test
-        _data[1] = (w * cct) / 255;
-        _data[0] = (w * (255-cct)) / 255;
+        _data[1] = cw;
+        _data[0] = ww;
         break;
       case TYPE_ANALOG_5CH: //RGB + warm white + cold white
         // perhaps a non-linear adjustment would be in order. need to test
-        _data[4] = (w * cct) / 255;
-        w = (w * (255-cct)) / 255;
+        _data[4] = cw;
+        w = ww;
       case TYPE_ANALOG_4CH: //RGBW
         _data[3] = w;
       case TYPE_ANALOG_3CH: //standard dumb RGB

wled00/cfg.cpp

@@ -82,6 +82,8 @@ bool deserializeConfig(JsonObject doc, bool fromFS) {
   uint8_t rgbwMode = hw_led[F("rgbwm")] | RGBW_MODE_DUAL; // use global setting (legacy)
   CJSON(correctWB, hw_led["cct"]);
   CJSON(cctFromRgb, hw_led[F("cr")]);
+	CJSON(strip.cctBlending, hw_led[F("cb")]);
+	Bus::setCCTBlend(strip.cctBlending);
 
   JsonArray ins = hw_led["ins"];
 
@@ -523,6 +525,7 @@ void serializeConfig() {
   hw_led[F("ledma")] = strip.milliampsPerLed;
   hw_led["cct"] = correctWB;
   hw_led[F("cr")] = cctFromRgb;
+	hw_led[F("cb")] = strip.cctBlending;
 
   JsonArray hw_led_ins = hw_led.createNestedArray("ins");
 

wled00/data/settings_leds.htm

@@ -512,7 +512,7 @@ <h3>Hardware setup</h3>
     Custom bus start indices: <input type="checkbox" onchange="tglSi(this.checked)" id="si"> <br>
     White Balance correction: <input type="checkbox" name="CCT"> <br>
     Calculate CCT from RGB: <input type="checkbox" name="CR"> <br>
-    CCT blending mode: TODO<br>
+    CCT additive blending: <input type="number" class="s" min="0" max="100" name="CB" required> %%<br>
     <hr style="width:260px">
     <div id="btns"></div>
     Touch threshold: <input type="number" class="s" min="0" max="100" name="TT" required><br>
@@ -539,7 +539,7 @@ <h3>Defaults</h3>
     <br><br>
 		Use Gamma correction for color: <input type="checkbox" name="GC"> (strongly recommended)<br>
 		Use Gamma correction for brightness: <input type="checkbox" name="GB"> (not recommended)<br><br>
-		Brightness factor: <input name="BF" type="number" class="s" min="1" max="255" required> %
+		Brightness factor: <input name="BF" type="number" class="s" min="1" max="255" required> %%
 		<h3>Transitions</h3>
 		Crossfade: <input type="checkbox" name="TF"><br>
 		Transition Time: <input name="TD" type="number" class="l" min="0" max="65500"> ms<br>

wled00/html_settings.h

@@ -119,7 +119,8 @@ style="width:260px">Make a segment for each output: <input type="checkbox"
 name="MS"><br>Custom bus start indices: <input type="checkbox" 
 onchange="tglSi(this.checked)" id="si"><br>White Balance correction: <input 
 type="checkbox" name="CCT"><br>Calculate CCT from RGB: <input type="checkbox" 
-name="CR"><br>CCT blending mode: TODO<br><hr style="width:260px"><div id="btns">
+name="CR"><br>CCT additive blending: <input type="number" class="s" min="0" 
+max="100" name="CB" required> %%<br><hr style="width:260px"><div id="btns">
 </div>Touch threshold: <input type="number" class="s" min="0" max="100" 
 name="TT" required><br>IR GPIO: <input type="number" min="-1" max="40" 
 name="IR" onchange="UI()" class="xs"><select name="IT" onchange="UI()"><option 
@@ -143,7 +144,7 @@ type="number" class="s" min="0" max="255" required> (0-255)<br><br>Apply preset
 type="checkbox" name="GC"> (strongly recommended)<br>
 Use Gamma correction for brightness: <input type="checkbox" name="GB">
  (not recommended)<br><br>Brightness factor: <input name="BF" type="number" 
-class="s" min="1" max="255" required> %<h3>Transitions</h3>Crossfade: <input 
+class="s" min="1" max="255" required> %%<h3>Transitions</h3>Crossfade: <input 
 type="checkbox" name="TF"><br>Transition Time: <input name="TD" type="number" 
 class="l" min="0" max="65500"> ms<br>Enable Palette transitions: <input 
 type="checkbox" name="PF"><h3>Timed light</h3>Default Duration: <input 

wled00/set.cpp

@@ -97,6 +97,8 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
     autoSegments = request->hasArg(F("MS"));
     correctWB = request->hasArg(F("CCT"));
     cctFromRgb = request->hasArg(F("CR"));
+		strip.cctBlending = request->arg(F("CB")).toInt();
+		Bus::setCCTBlend(strip.cctBlending);
 
     for (uint8_t s = 0; s < WLED_MAX_BUSSES; s++) {
       char lp[4] = "L0"; lp[2] = 48+s; lp[3] = 0; //ascii 0-9 //strip data pin

wled00/wled.h

@@ -269,8 +269,8 @@ WLED_GLOBAL byte bootPreset   _INIT(0);                   // save preset to load
 //if false, only one segment spanning the total LEDs is created,
 //but not on LED settings save if there is more than one segment currently
 WLED_GLOBAL bool autoSegments _INIT(false);
-WLED_GLOBAL bool correctWB _INIT(false);    //CCT color correction of RGB color
-WLED_GLOBAL bool cctFromRgb _INIT(true);    //CCT is calculated from RGB instead of using seg.cct
+WLED_GLOBAL bool correctWB _INIT(false); //CCT color correction of RGB color
+WLED_GLOBAL bool cctFromRgb _INIT(true); //CCT is calculated from RGB instead of using seg.cct
 
 WLED_GLOBAL byte col[]    _INIT_N(({ 255, 160, 0, 0 }));  // current RGB(W) primary color. col[] should be updated if you want to change the color.
 WLED_GLOBAL byte colSec[] _INIT_N(({ 0, 0, 0, 0 }));      // current RGB(W) secondary color

wled00/xml.cpp

@@ -372,6 +372,7 @@ void getSettingsJS(byte subPage, char* dest)
     sappend('c',SET_F("MS"),autoSegments);
     sappend('c',SET_F("CCT"),correctWB);
     sappend('c',SET_F("CR"),cctFromRgb);
+		sappend('v',SET_F("CB"),strip.cctBlending);
 
     for (uint8_t s=0; s < busses.getNumBusses(); s++) {
       Bus* bus = busses.getBus(s);