Diff: inc/bluetooth/MicroBitMagnetometerService.h

Revision:

1:8aa5cdb4ab67

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/inc/bluetooth/MicroBitMagnetometerService.h	Thu Apr 07 01:33:22 2016 +0100
@@ -0,0 +1,91 @@
+/*
+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_MAGNETOMETER_SERVICE_H
+#define MICROBIT_MAGNETOMETER_SERVICE_H
+
+#include "ble/BLE.h"
+#include "MicroBitConfig.h"
+#include "MicroBitCompass.h"
+#include "EventModel.h"
+
+// UUIDs for our service and characteristics
+extern const uint8_t  MicroBitMagnetometerServiceUUID[];
+extern const uint8_t  MicroBitMagnetometerServiceDataUUID[];
+extern const uint8_t  MicroBitMagnetometerServiceBearingUUID[];
+extern const uint8_t  MicroBitMagnetometerServicePeriodUUID[];
+
+
+/**
+  * Class definition for the MicroBit BLE Magnetometer Service.
+  * Provides access to live magnetometer data via BLE, and provides basic configuration options.
+  */
+class MicroBitMagnetometerService
+{
+    public:
+
+    /**
+      * Constructor.
+      * Create a representation of the MagnetometerService.
+      * @param _ble The instance of a BLE device that we're running on.
+      * @param _compass An instance of MicroBitCompass to use as our Magnetometer source.
+      */
+    MicroBitMagnetometerService(BLEDevice &_ble, MicroBitCompass &_compass);
+
+    private:
+
+    /**
+      * Callback. Invoked when any of our attributes are written via BLE.
+      */
+    void onDataWritten(const GattWriteCallbackParams *params);
+
+    /**
+     * Magnetometer update callback
+     */
+    void magnetometerUpdate(MicroBitEvent e);
+
+    /**
+     * Sample Period Change Needed callback.
+     * Reconfiguring the magnetometer can to a REALLY long time (sometimes even seconds to complete)
+     * So we do this in the background when necessary, through this event handler.
+     */
+    void samplePeriodUpdateNeeded(MicroBitEvent e);
+
+    // Bluetooth stack we're running on.
+    BLEDevice           &ble;
+    MicroBitCompass     &compass;
+
+    // memory for our 8 bit control characteristics.
+    int16_t             magnetometerDataCharacteristicBuffer[3];
+    uint16_t            magnetometerBearingCharacteristicBuffer;
+    uint16_t            magnetometerPeriodCharacteristicBuffer;
+
+    // Handles to access each characteristic when they are held by Soft Device.
+    GattAttribute::Handle_t magnetometerDataCharacteristicHandle;
+    GattAttribute::Handle_t magnetometerBearingCharacteristicHandle;
+    GattAttribute::Handle_t magnetometerPeriodCharacteristicHandle;
+};
+
+#endif