Bugfix: convert cctBlend value back to "%" for UI (wled#4737)

* Bugfix: convert cctBlend value back to "%" for UI

Author: DedeHai

wled00/bus_manager.cpp

@@ -545,7 +545,7 @@ void BusPwm::show() {
     unsigned duty = (_data[i] * pwmBri) / 255;
     unsigned deadTime = 0;
 
-    if (_type == TYPE_ANALOG_2CH && Bus::getCCTBlend() == 0) {
+    if (_type == TYPE_ANALOG_2CH && Bus::_cctBlend == 0) {
       // add dead time between signals (when using dithering, two full 8bit pulses are required)
       deadTime = (1+dithering) << bitShift;
       // we only need to take care of shortening the signal at (almost) full brightness otherwise pulses may overlap
@@ -972,7 +972,7 @@ bool PolyBus::_useParallelI2S = false;
 
 // Bus static member definition
 int16_t Bus::_cct = -1;
-uint8_t Bus::_cctBlend = 0;
+uint8_t Bus::_cctBlend = 0; // 0 - 127
 uint8_t Bus::_gAWM = 255;
 
 uint16_t BusDigital::_milliAmpsTotal = 0;

wled00/bus_manager.h

@@ -189,9 +189,9 @@ class Bus {
     static inline void     setGlobalAWMode(uint8_t m) { if (m < 5) _gAWM = m; else _gAWM = AW_GLOBAL_DISABLED; }
     static inline uint8_t  getGlobalAWMode()          { return _gAWM; }
     static inline void     setCCT(int16_t cct)        { _cct = cct; }
-    static inline uint8_t  getCCTBlend()              { return _cctBlend; }
-    static inline void     setCCTBlend(uint8_t b) {
-      _cctBlend = (std::min((int)b,100) * 127) / 100;
+    static inline uint8_t  getCCTBlend()              { return (_cctBlend * 100 + 64) / 127; } // returns 0-100, 100% = 127. +64 for rounding
+    static inline void     setCCTBlend(uint8_t b) {        // input is 0-100
+      _cctBlend = (std::min((int)b,100) * 127 + 50) / 100; // +50 for rounding, b=100% -> 127
       //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;