Plane: Converted demanded_pitch_cd to float degrees

Also initialized to NaN which will not show up in the ATT.DesPitch
plots, unless a mode (usually) overwrites it.

ArduPlane/Attitude.cpp

@@ -209,7 +209,7 @@ float Plane::stabilize_pitch_get_pitch_out()
     const bool quadplane_in_frwd_transition = false;
 #endif
 
-    demanded_pitch_cd = nav_pitch_cd + int32_t(g.pitch_trim * 100.0) + SRV_Channels::get_output_scaled(SRV_Channel::k_throttle) * g.kff_throttle_to_pitch;
+    demanded_pitch = nav_pitch_cd*0.01f + g.pitch_trim + SRV_Channels::get_output_scaled(SRV_Channel::k_throttle)*0.01f*g.kff_throttle_to_pitch;
     bool disable_integrator = false;
     if (control_mode == &mode_stabilize && channel_pitch->get_control_in() != 0) {
         disable_integrator = true;
@@ -224,10 +224,10 @@ float Plane::stabilize_pitch_get_pitch_out()
         !control_mode->does_auto_throttle() &&
         flare_mode == FlareMode::ENABLED_PITCH_TARGET &&
         throttle_at_zero()) {
-        demanded_pitch_cd = landing.get_pitch_cd();
+        demanded_pitch = landing.get_pitch_cd()*0.01f;
     }
 
-    return pitchController.get_servo_out(demanded_pitch_cd - ahrs.pitch_sensor, speed_scaler, disable_integrator,
+    return pitchController.get_servo_out(demanded_pitch*100 - ahrs.pitch_sensor, speed_scaler, disable_integrator,
                                          ground_mode && !(plane.flight_option_enabled(FlightOptions::DISABLE_GROUND_PID_SUPPRESSION)));
 }
 

ArduPlane/Log.cpp

@@ -7,7 +7,7 @@ void Plane::Log_Write_Attitude(void)
 {
     Vector3f targets {       // Package up the targets into a vector for commonality with Copter usage of Log_Wrote_Attitude
         nav_roll_cd * 0.01f,
-        demanded_pitch_cd * 0.01f,
+        demanded_pitch,
         0 //Plane does not have the concept of navyaw. This is a placeholder.
     };
 

ArduPlane/Plane.cpp

@@ -511,6 +511,10 @@ void Plane::update_control_mode(void)
     takeoff_state.throttle_lim_max = 100.0f;
     takeoff_state.throttle_lim_min = -100.0f;
 
+    // Preemptively set demanded pitch to NaN, so that it properly doesn't
+    // get logged. Modes ovewriting it (most modes do) will change it.
+    demanded_pitch = NAN;
+
     update_fly_forward();
 
     control_mode->update();

ArduPlane/Plane.h

@@ -671,8 +671,8 @@ class Plane : public AP_Vehicle {
     // The instantaneous navigator-commanded pitch angle. Hundredths of a degree
     int32_t nav_pitch_cd;
 
-    // The instantaneous desired pitch angle. Hundredths of a degree.
-    int32_t demanded_pitch_cd;
+    // The instantaneous desired pitch angle in degrees.
+    float demanded_pitch;
 
     // the aerodynamic load factor. This is calculated from the demanded
     // roll before the roll is clipped, using 1/sqrt(cos(nav_roll))