added ground_course 0-36000 for Ardupilot

git-svn-id: https://arducopter.googlecode.com/svn/trunk@353 f9c3cf11-9bcb-44bc-f272-b75c42450872

libraries/AP_Compass/AP_Compass.cpp

@@ -107,7 +107,7 @@ AP_Compass::calculate(float roll, float pitch)
 	
 	// Magnetic heading
 	heading = atan2(-head_Y, head_X);
-	ground_course = degrees(heading) + 180;
+	ground_course = (degrees(heading) + 180) * 100;
 	
 	// Optimization for external DCM use. calculate normalized components
 	heading_X = cos(heading);

libraries/AP_Compass/examples/AP_Compass_test/AP_Compass_test.pde

@@ -28,13 +28,13 @@ void loop()
 		compass.update();
 		compass.calculate(0, 0);	// roll = 0, pitch = 0 for this example
 	    Serial.print("Heading:");
-		Serial.print(degrees(compass.heading));
+		Serial.print(compass.ground_course,DEC);
     	Serial.print("  (");
 		Serial.print(compass.mag_X);
 	    Serial.print(",");
 		Serial.print(compass.mag_Y);
     	Serial.print(",");
 		Serial.print(compass.mag_Z);
-		Serial.println();
+   		Serial.println(" )");
 	}
 }