Add virtual power support for BT-ATS trainer

Add "BT Advanced Training System" to dropdown.
Implement 3rd-order polynomial to get power from speed.

Fixes #246.

src/Pages.cpp

@@ -368,6 +368,7 @@ DevicePage::DevicePage(QWidget *parent) : QWidget(parent)
     virtualPower->addItem("Power - Kurt Kinetic Cyclone");
     virtualPower->addItem("Power - Kurt Kinetic Road Machine");
     virtualPower->addItem("Power - Cyclops Fluid 2");
+    virtualPower->addItem("Power - BT Advanced Training System");
     virtualPower->setCurrentIndex(0);
 
 // THIS CODE IS DISABLED FOR THIS RELEASE XXX

src/QuarqdClient.cpp

@@ -160,6 +160,7 @@ QuarqdClient::parseElement(QString &strBuf) // updates QuarqdClient::telemetry
                 if (value > 0) {
                     // TODO: let wheel size be a configurable, default now to 2101 mm
                     telemetry.setSpeed((value*2101/1000*60)/1000); // meter/minute -> meter/hour -> km/hour
+                    telemetry.setWheelRpm(value);
                     lastReadSpeed = elapsedTime.elapsed();
                 }
                 telemetry.setTime(getTimeStamp(str));

src/RealtimeController.cpp

@@ -80,6 +80,19 @@ RealtimeController::processRealtimeData(RealtimeData &rtData)
         // http://thebikegeek.blogspot.com/2009/12/while-we-wait-for-better-and-better.html
         rtData.setWatts((0.0115*(mph*mph*mph)) - ((0.0137)*(mph*mph)) + ((8.9788)*(mph)));
         }
+    case 4 : // BT-ATS - BT Advanced Training System
+        {
+        //        v is expressed in revs/second
+        double v = rtData.getWheelRpm()/60.0;
+        // using the algorithm from Steven Sansonetti of BT:
+        //  This is a 3rd order polynomial, where P = av3 + bv2 + cv + d
+        //  where:
+                double a =       2.90390167E-01; // ( 0.290390167)
+                double b =     - 4.61311774E-02; // ( -0.0461311774)
+                double c =       5.92125507E-01; // (0.592125507)
+                double d =       0.0;
+        rtData.setWatts(a*v*v*v + b*v*v +c*v + d);
+        }
     default : // unknown - do nothing
         break;
     }
@@ -101,6 +114,8 @@ RealtimeController::processSetup()
         break;
     case 3 : // TODO Cyclops Fluid 2 - use an algorithm
         break;
+    case 4 : // TODO BT-ATS - BT Advanced Training System - use an algorithm
+        break;
     default : // unknown - do nothing
         break;
     }

src/RealtimeData.cpp

@@ -21,7 +21,7 @@
 
 RealtimeData::RealtimeData()
 {
-    watts = hr = speed = cadence  = load = 0;
+    watts = hr = speed = wheelRpm = cadence  = load = 0;
     time = 0;
 }
 
@@ -41,6 +41,10 @@ void RealtimeData::setSpeed(double speed)
 {
     this->speed = speed;
 }
+void RealtimeData::setWheelRpm(double wheelRpm)
+{
+    this->wheelRpm = wheelRpm;
+}
 void RealtimeData::setCadence(double aCadence)
 {
     cadence = aCadence;
@@ -66,6 +70,10 @@ double RealtimeData::getSpeed()
 {
     return speed;
 }
+double RealtimeData::getWheelRpm()
+{
+    return wheelRpm;
+}
 double RealtimeData::getCadence()
 {
     return cadence;

src/RealtimeData.h

@@ -32,19 +32,20 @@ public:
     void setHr(double hr);
     void setTime(long time);
     void setSpeed(double speed);
+    void setWheelRpm(double wheelRpm);
     void setCadence(double aCadence);
     void setLoad(double load);
     double getWatts();
     double getHr();
     long getTime();
     double getSpeed();
+    double getWheelRpm();
     double getCadence();
     double getLoad();
 
 private:
-    double hr, watts, speed, load;
     unsigned long time;
-
+    double hr, watts, speed, wheelRpm, load;
     double cadence;      // in rpm
 };