powermeter refactor: SML lib: replace double by float

avoid additional conversions and avoid double for the fact that
calculations on type double are implemented in software, whereas
float is handled in hardware on ESP32.

include/PowerMeterSml.h

@@ -27,7 +27,7 @@ private:
 
     typedef struct {
         uint8_t const OBIS[6];
-        void (*decoder)(double&);
+        void (*decoder)(float&);
         float* target;
         char const* name;
     } OBISHandler;

lib/SMLParser/sml.cpp

@@ -317,7 +317,7 @@ void smlOBISManufacturer(unsigned char *str, int maxSize)
   }
 }
 
-void smlPow(double &val, signed char &scaler)
+void smlPow(float &val, signed char &scaler)
 {
   if (scaler < 0) {
     while (scaler++) {
@@ -372,7 +372,7 @@ void smlOBISByUnit(long long int &val, signed char &scaler, sml_units_t unit)
   }
 }
 
-void smlOBISWh(double &wh)
+void smlOBISWh(float &wh)
 {
   long long int val;
   smlOBISByUnit(val, sc, SML_WATT_HOUR);
@@ -380,7 +380,7 @@ void smlOBISWh(double &wh)
   smlPow(wh, sc);
 }
 
-void smlOBISW(double &w)
+void smlOBISW(float &w)
 {
   long long int val;
   smlOBISByUnit(val, sc, SML_WATT);
@@ -388,7 +388,7 @@ void smlOBISW(double &w)
   smlPow(w, sc);
 }
 
-void smlOBISVolt(double &v)
+void smlOBISVolt(float &v)
 {
   long long int val;
   smlOBISByUnit(val, sc, SML_VOLT);
@@ -396,7 +396,7 @@ void smlOBISVolt(double &v)
   smlPow(v, sc);
 }
 
-void smlOBISAmpere(double &a)
+void smlOBISAmpere(float &a)
 {
   long long int val;
   smlOBISByUnit(val, sc, SML_AMPERE);

lib/SMLParser/sml.h

@@ -97,10 +97,9 @@ bool smlOBISCheck(const unsigned char *obis);
 void smlOBISManufacturer(unsigned char *str, int maxSize);
 void smlOBISByUnit(long long int &wh, signed char &scaler, sml_units_t unit);
 
-// Be aware that double on Arduino UNO is just 32 bit
-void smlOBISWh(double &wh);
-void smlOBISW(double &w);
-void smlOBISVolt(double &v);
-void smlOBISAmpere(double &a);
+void smlOBISWh(float &wh);
+void smlOBISW(float &w);
+void smlOBISVolt(float &v);
+void smlOBISAmpere(float &a);
 
 #endif

src/PowerMeterSml.cpp

@@ -22,16 +22,15 @@ void PowerMeterSml::processSmlByte(uint8_t byte)
             for (auto& handler: smlHandlerList) {
                 if (!smlOBISCheck(handler.OBIS)) { continue; }
 
-                double helper;
-                handler.decoder(helper);
-
-                std::lock_guard<std::mutex> l(_mutex);
-                *handler.target = helper;
                 gotUpdate();
 
-                if (!_verboseLogging) { continue; }
-                MessageOutput.printf("[PowerMeterSml] decoded %s to %.2f\r\n",
-                        handler.name, helper);
+                std::lock_guard<std::mutex> l(_mutex);
+                handler.decoder(*handler.target);
+
+                if (_verboseLogging) {
+                    MessageOutput.printf("[PowerMeterSml] decoded %s to %.2f\r\n",
+                            handler.name, *handler.target);
+                }
             }
             break;
         default: