Diff: microbit/microbit-dal/inc/bluetooth/MicroBitLEDService.h

Revision:

0:b9164b348919

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/microbit/microbit-dal/inc/bluetooth/MicroBitLEDService.h	Mon Oct 17 12:41:20 2016 +0000
@@ -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_LED_SERVICE_H
+#define MICROBIT_LED_SERVICE_H
+
+#include "MicroBitConfig.h"
+#include "ble/BLE.h"
+#include "MicroBitDisplay.h"
+
+// Defines the buffer size for scrolling text over BLE, hence also defines
+// the maximum string length that can be scrolled via the BLE service.
+#define MICROBIT_BLE_MAXIMUM_SCROLLTEXT         20
+
+// UUIDs for our service and characteristics
+extern const uint8_t  MicroBitLEDServiceUUID[];
+extern const uint8_t  MicroBitLEDServiceMatrixUUID[];
+extern const uint8_t  MicroBitLEDServiceTextUUID[];
+extern const uint8_t  MicroBitLEDServiceScrollingSpeedUUID[];
+
+
+/**
+  * Class definition for the custom MicroBit LED Service.
+  * Provides a BLE service to remotely read and write the state of the LED display.
+  */
+class MicroBitLEDService
+{
+    public:
+
+    /**
+      * Constructor.
+      * Create a representation of the LEDService
+      * @param _ble The instance of a BLE device that we're running on.
+      * @param _display An instance of MicroBitDisplay to interface with.
+      */
+    MicroBitLEDService(BLEDevice &_ble, MicroBitDisplay &_display);
+
+    /**
+      * Callback. Invoked when any of our attributes are written via BLE.
+      */
+    void onDataWritten(const GattWriteCallbackParams *params);
+
+    /**
+      * Callback. Invoked when any of our attributes are read via BLE.
+      */
+    void onDataRead(GattReadAuthCallbackParams *params);
+
+    private:
+
+    // Bluetooth stack we're running on.
+    BLEDevice           &ble;
+    MicroBitDisplay     &display;
+
+    // memory for our 8 bit control characteristics.
+    uint8_t             matrixCharacteristicBuffer[5];
+    uint16_t            scrollingSpeedCharacteristicBuffer;
+    uint8_t             textCharacteristicBuffer[MICROBIT_BLE_MAXIMUM_SCROLLTEXT];
+
+    // Handles to access each characteristic when they are held by Soft Device.
+    GattAttribute::Handle_t matrixCharacteristicHandle;
+    GattAttribute::Handle_t textCharacteristicHandle;
+    GattAttribute::Handle_t scrollingSpeedCharacteristicHandle;
+
+    // We hold a copy of the GattCharacteristic, as mbed's BLE API requires this to provide read callbacks (pity!).
+    GattCharacteristic  matrixCharacteristic;
+};
+
+
+#endif