Diff: BatteryService.h

Revision:

5:dc4e6dbcb79b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BatteryService.h	Tue Jan 17 03:48:12 2017 +0000
@@ -0,0 +1,77 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __BLE_BATTERY_SERVICE_H__
+#define __BLE_BATTERY_SERVICE_H__
+
+#include "ble/BLE.h"
+
+/**
+* @class BatteryService
+* @brief BLE Battery Service. This service displays the battery level from 0% to 100%, represented as an 8bit number.
+* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.battery_service.xml
+* Battery Level Char:  https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.battery_level.xml
+*/
+class BatteryService {
+public:
+    /**
+     * @param[in] _ble
+     *               BLE object for the underlying controller.
+     * @param[in] level
+     *               8bit batterly level. Usually used to represent percentage of batterly charge remaining.
+     */
+    BatteryService(BLE &_ble, uint8_t level = 100) :
+        ble(_ble),
+        batteryLevel(level),
+        batteryLevelCharacteristic(GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, &batteryLevel, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY) {
+
+        GattCharacteristic *charTable[] = {&batteryLevelCharacteristic};
+        GattService         batteryService(GattService::UUID_BATTERY_SERVICE, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+
+        ble.addService(batteryService);
+    }
+
+    /**
+     * @brief Update the battery level with a new value. Valid values lie between 0 and 100,
+     * anything outside this range will be ignored.
+     *
+     * @param newLevel
+     *              Update to battery level.
+     */
+    void updateBatteryLevel(uint8_t newLevel) {
+        batteryLevel = newLevel;
+        ble.gattServer().write(batteryLevelCharacteristic.getValueHandle(), &batteryLevel, 1);
+    }
+
+protected:
+    /**
+     * A reference to the underlying BLE instance that this object is attached to.
+     * The services and characteristics will be registered in this BLE instance.
+     */
+    BLE &ble;
+
+    /**
+     * The current battery level represented as an integer from 0% to 100%.
+     */
+    uint8_t    batteryLevel;
+    /**
+     * A ReadOnlyGattCharacteristic that allows access to the peer device to the
+     * batteryLevel value through BLE.
+     */
+    ReadOnlyGattCharacteristic<uint8_t> batteryLevelCharacteristic;
+};
+
+#endif /* #ifndef __BLE_BATTERY_SERVICE_H__*/
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