AP_Airspeed: add inflight airspeed cal rc switch

libraries/AP_Airspeed/AP_Airspeed.h

@@ -48,6 +48,11 @@ public:
 
     void init(void);
 
+#if AP_AIRSPEED_AUTOCAL_ENABLE
+    // inflight ratio calibration
+    void set_calibration_enabled(bool enable) {calibration_enabled = enable;}
+#endif //AP_AIRSPEED_AUTOCAL_ENABLE
+
     // read the analog source and update airspeed
     void update(bool log);
 
@@ -230,6 +235,8 @@ private:
         } failures;
     } state[AIRSPEED_MAX_SENSORS];
 
+    bool calibration_enabled = false;
+
     // current primary sensor
     uint8_t primary;
     uint8_t num_sensors;

libraries/AP_Airspeed/Airspeed_Calibration.cpp

@@ -115,7 +115,7 @@ float Airspeed_Calibration::update(float airspeed, const Vector3f &vg, int16_t m
 void AP_Airspeed::update_calibration(uint8_t i, const Vector3f &vground, int16_t max_airspeed_allowed_during_cal)
 {
 #if AP_AIRSPEED_AUTOCAL_ENABLE
-    if (!param[i].autocal) {
+    if (!param[i].autocal && !calibration_enabled) {
         // auto-calibration not enabled
         return;
     }
@@ -146,6 +146,7 @@ void AP_Airspeed::update_calibration(uint8_t i, const Vector3f &vground, int16_t
             param[i].ratio.save();
             state[i].last_saved_ratio = param[i].ratio;
             state[i].counter = 0;
+            GCS_SEND_TEXT(MAV_SEVERITY_INFO, "Airspeed %u ratio reset: %f", i , static_cast<double> (param[i].ratio));
         }
     } else {
         state[i].counter++;