TemperatureService.h

00001 #ifndef __TEMPERATURE_SERVICE_H__
00002 #define __TEMPERATURE_SERVICE_H__
00003 
00004 #include "ble/BLE.h"
00005 
00006 #define UUID_TEMPERATURE_CELSIUS_CHAR 0x2A1F
00007 #define UUID_TEMPERATURE_SERVICE "5D34E2F0-3DD2-07AC-38F1-BBAD120EF852"
00008       
00009 
00010 /**
00011 * @class TemperatureService
00012 * @brief BLE Temperature Service. This service displays the temperature, represented as an 16bit number.
00013 */
00014 class TemperatureService {
00015 public:
00016     /**
00017      * @param[in] _ble
00018      *               BLE object for the underlying controller.
00019      * @param[in] temperature
00020      *               16bit temperature in 0.1 degrees Celsius
00021      */
00022     TemperatureService (BLE &_ble, int16_t temperature = 200) :
00023         ble(_ble),
00024         temperature(temperature),
00025         temperatureCharacteristic(UUID_TEMPERATURE_CELSIUS_CHAR, &temperature, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY) {
00026 
00027         GattCharacteristic *charTable[] = {&temperatureCharacteristic};
00028         GattService         TemperatureService (UUID(UUID_TEMPERATURE_SERVICE), charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
00029 
00030         ble.addService(TemperatureService);
00031     }
00032 
00033     /**
00034      * @brief Update the temperature with a new value. Valid values lie between -2732 and above.
00035      *
00036      * @param newTemp
00037      *              Update to temperature.
00038      */
00039     void updateTemperature(int16_t newTemp) {
00040         temperature = newTemp;
00041         uint16_t temp = (uint16_t)temperature;
00042         ble.gattServer().write(temperatureCharacteristic.getValueHandle(), (const uint8_t*)&temp, sizeof(temperature));
00043     }
00044 
00045 protected:
00046     /**
00047      * A reference to the underlying BLE instance that this object is attached to.
00048      * The services and characteristics will be registered in this BLE instance.
00049      */
00050     BLE &ble;
00051 
00052     /**
00053      * The current temperature represented as 0.1 degrees Celsius.
00054      */
00055     int16_t    temperature;
00056     /**
00057      * A ReadOnlyGattCharacteristic that allows access to the peer device to the
00058      * temperature value through BLE.
00059      */
00060     ReadOnlyGattCharacteristic<int16_t> temperatureCharacteristic;
00061 };
00062 
00063 #endif /* #ifndef __TEMPERATURE_SERVICE_H__*/