BatteryService.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #ifndef __BLE_BATTERY_SERVICE_H__
00018 #define __BLE_BATTERY_SERVICE_H__
00019 
00020 #include "BLEDevice.h"
00021 
00022 /* Battery Service */
00023 /* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.battery_service.xml */
00024 /* Battery Level Char:  https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.battery_level.xml */
00025 class BatteryService {
00026 public:
00027     BatteryService(BLEDevice &_ble, uint8_t level = 100) :
00028         ble(_ble),
00029         batteryLevel(level),
00030         batteryLevelCharacteristic(GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, &batteryLevel, sizeof(batteryLevel), sizeof(batteryLevel),
00031                                    GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY) {
00032 
00033         static bool serviceAdded = false; /* We should only ever need to add the heart rate service once. */
00034         if (serviceAdded) {
00035             return;
00036         }
00037 
00038         GattCharacteristic *charTable[] = {&batteryLevelCharacteristic};
00039         GattService         batteryService(GattService::UUID_BATTERY_SERVICE, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
00040 
00041         ble.addService(batteryService);
00042         serviceAdded = true;
00043     }
00044 
00045     /**
00046      * Update the battery level with a new value. Valid values range from
00047      * 0..100. Anything outside this range will be ignored.
00048      * @param newLevel New level.
00049      */
00050     void updateBatteryLevel(uint8_t newLevel) {
00051         batteryLevel = newLevel;
00052         ble.updateCharacteristicValue (batteryLevelCharacteristic.getValueAttribute().getHandle(), &batteryLevel, 1);
00053     }
00054 
00055 private:
00056     BLEDevice           &ble;
00057     uint8_t              batteryLevel;
00058     GattCharacteristic   batteryLevelCharacteristic;
00059 };
00060 
00061 #endif /* #ifndef __BLE_BATTERY_SERVICE_H__*/