Diff: inc/drivers/MicroBitCompassCalibrator.h

Revision:

1:8aa5cdb4ab67

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/inc/drivers/MicroBitCompassCalibrator.h	Thu Apr 07 01:33:22 2016 +0100
@@ -0,0 +1,84 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2016 British Broadcasting Corporation.
+This software is provided by Lancaster University by arrangement with the BBC.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef MICROBIT_COMPASS_CALIBRATOR_H
+#define MICROBIT_COMPASS_CALIBRATOR_H
+
+#include "MicroBitConfig.h"
+#include "MicroBitCompass.h"
+#include "MicroBitAccelerometer.h"
+#include "MicroBitDisplay.h"
+
+
+/**
+  * Class definition for an interactive compass calibration algorithm.
+  *
+  * The algorithm uses an accelerometer to ensure that a broad range of sample data has been gathered
+  * from the compass module, then performs a least mean squares optimisation of the
+  * results to determine the calibration data for the compass.
+  *
+  * The LED matrix display is used to provide feedback to the user on the gestures required.
+  *
+  * This class listens for calibration requests from the compass (on the default event model),
+  * and automatically initiates a calibration sequence as necessary.
+  */
+class MicroBitCompassCalibrator
+{
+    MicroBitCompass&        compass;
+    MicroBitAccelerometer&  accelerometer;
+    MicroBitDisplay&        display;
+
+    public:
+
+    /**
+      * Constructor.
+      *
+      * Create an object capable of calibrating the compass.
+      *
+      * The algorithm uses an accelerometer to ensure that a broad range of sample data has been gathered
+      * from the compass module, then performs a least mean squares optimisation of the
+      * results to determine the calibration data for the compass.
+      *
+      * The LED matrix display is used to provide feedback to the user on the gestures required.
+      *
+      * @param compass The compass instance to calibrate.
+      *
+      * @param accelerometer The accelerometer to gather contextual data from.
+      *
+      * @param display The LED matrix to display user feedback on.
+      */
+    MicroBitCompassCalibrator(MicroBitCompass& _compass, MicroBitAccelerometer& _accelerometer, MicroBitDisplay& _display);
+
+    /**
+      * Performs a simple game that in parallel, calibrates the compass.
+      *
+      * This function is executed automatically when the user requests a compass bearing, and compass calibration is required.
+      *
+      * This function is, by design, synchronous and only returns once calibration is complete.
+      */
+    void calibrate(MicroBitEvent);
+};
+
+#endif