Compass: remove accumulate

this method is a noop on all backends

libraries/AP_Compass/AP_Compass.cpp

@@ -1017,15 +1017,6 @@ void Compass::_detect_backends(void)
     }
 }
 
-void
-Compass::accumulate(void)
-{
-    for (uint8_t i=0; i< _backend_count; i++) {
-        // call accumulate on each of the backend
-        _backends[i]->accumulate();
-    }
-}
-
 bool
 Compass::read(void)
 {

libraries/AP_Compass/AP_Compass.h

@@ -74,10 +74,6 @@ public:
     ///
     bool read();
 
-    /// use spare CPU cycles to accumulate values from the compass if
-    /// possible (this method should also be implemented in the backends)
-    void accumulate();
-
     /// Calculate the tilt-compensated heading_ variables.
     ///
     /// @param dcm_matrix			The current orientation rotation matrix

libraries/AP_Compass/AP_Compass_Backend.h

@@ -34,10 +34,6 @@ public:
     // read sensor data
     virtual void read(void) = 0;
 
-    // accumulate a reading from the magnetometer. Optional in
-    // backends
-    virtual void accumulate(void) {};
-
     // callback for UAVCAN messages
     virtual void handle_mag_msg(Vector3f &mag) {};
 

libraries/AP_Compass/AP_Compass_UAVCAN.cpp

@@ -123,8 +123,6 @@ bool AP_Compass_UAVCAN::register_uavcan_compass(uint8_t mgr, uint8_t node)
         _sum.zero();
         _count = 0;
 
-        accumulate();
-
         debug_mag_uavcan(2, "AP_Compass_UAVCAN loaded\n\r");
 
         return true;