Alex Cordonnier / BLE_API

High level Bluetooth Low Energy API and radio abstraction layer

Fork of BLE_API by Bluetooth Low Energy

ble/services/HealthThermometerService.h@1134:d540a48f650d, 2016-04-06 (annotated)

Committer:
vcoubard
Date:
Wed Apr 06 19:13:52 2016 +0100
Revision:
1134:d540a48f650d
Parent:
1131:692ddf04fc42 
Synchronized with git rev d363d7ee

Author: Rohit Grover

Merge branch 'develop'

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vcoubard 1131:692ddf04fc42 1 /* mbed Microcontroller Library
vcoubard 1131:692ddf04fc42 2 * Copyright (c) 2006-2013 ARM Limited
vcoubard 1131:692ddf04fc42 3 *
vcoubard 1131:692ddf04fc42 4 * Licensed under the Apache License, Version 2.0 (the "License");
vcoubard 1131:692ddf04fc42 5 * you may not use this file except in compliance with the License.
vcoubard 1131:692ddf04fc42 6 * You may obtain a copy of the License at
vcoubard 1131:692ddf04fc42 7 *
vcoubard 1131:692ddf04fc42 8 * http://www.apache.org/licenses/LICENSE-2.0
vcoubard 1131:692ddf04fc42 9 *
vcoubard 1131:692ddf04fc42 10 * Unless required by applicable law or agreed to in writing, software
vcoubard 1131:692ddf04fc42 11 * distributed under the License is distributed on an "AS IS" BASIS,
vcoubard 1131:692ddf04fc42 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
vcoubard 1131:692ddf04fc42 13 * See the License for the specific language governing permissions and
vcoubard 1131:692ddf04fc42 14 * limitations under the License.
vcoubard 1131:692ddf04fc42 15 */
vcoubard 1131:692ddf04fc42 16
vcoubard 1131:692ddf04fc42 17 #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__
vcoubard 1131:692ddf04fc42 18 #define __BLE_HEALTH_THERMOMETER_SERVICE_H__
vcoubard 1131:692ddf04fc42 19
vcoubard 1131:692ddf04fc42 20 #include "ble/BLE.h"
vcoubard 1131:692ddf04fc42 21
vcoubard 1131:692ddf04fc42 22 /**
vcoubard 1131:692ddf04fc42 23 * @class HealthThermometerService
vcoubard 1134:d540a48f650d 24 * @brief BLE Health Thermometer Service. This service provides the location of the thermometer and the temperature.
vcoubard 1134:d540a48f650d 25 * Service: https://developer.bluetooth.org/gatt/profiles/Pages/ProfileViewer.aspx?u=org.bluetooth.profile.health_thermometer.xml
vcoubard 1134:d540a48f650d 26 * Temperature Measurement: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml
vcoubard 1131:692ddf04fc42 27 * Temperature Type: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml
vcoubard 1131:692ddf04fc42 28 */
vcoubard 1131:692ddf04fc42 29 class HealthThermometerService {
vcoubard 1131:692ddf04fc42 30 public:
vcoubard 1131:692ddf04fc42 31 /**
vcoubard 1134:d540a48f650d 32 * @enum Sensor Location.
vcoubard 1134:d540a48f650d 33 * @brief Location of sensor on the body.
vcoubard 1131:692ddf04fc42 34 */
vcoubard 1131:692ddf04fc42 35 enum SensorLocation_t {
vcoubard 1134:d540a48f650d 36 LOCATION_ARMPIT = 1, /*!< Armpit. */
vcoubard 1134:d540a48f650d 37 LOCATION_BODY, /*!< Body. */
vcoubard 1134:d540a48f650d 38 LOCATION_EAR, /*!< Ear. */
vcoubard 1134:d540a48f650d 39 LOCATION_FINGER, /*!< Finger. */
vcoubard 1131:692ddf04fc42 40 LOCATION_GI_TRACT, /*!< GI tract */
vcoubard 1134:d540a48f650d 41 LOCATION_MOUTH, /*!< Mouth. */
vcoubard 1134:d540a48f650d 42 LOCATION_RECTUM, /*!< Rectum. */
vcoubard 1134:d540a48f650d 43 LOCATION_TOE, /*!< Toe. */
vcoubard 1134:d540a48f650d 44 LOCATION_EAR_DRUM, /*!< Eardrum. */
vcoubard 1131:692ddf04fc42 45 };
vcoubard 1131:692ddf04fc42 46
vcoubard 1131:692ddf04fc42 47 public:
vcoubard 1131:692ddf04fc42 48 /**
vcoubard 1134:d540a48f650d 49 * @brief Add the Health Thermometer Service to an existing BLE object, initialize with temperature and location.
vcoubard 1134:d540a48f650d 50 * @param[ref] _ble Reference to the BLE device.
vcoubard 1134:d540a48f650d 51 * @param[in] initialTemp Initial value in celsius.
vcoubard 1131:692ddf04fc42 52 * @param[in] _location
vcoubard 1131:692ddf04fc42 53 */
vcoubard 1131:692ddf04fc42 54 HealthThermometerService(BLE &_ble, float initialTemp, uint8_t _location) :
vcoubard 1131:692ddf04fc42 55 ble(_ble),
vcoubard 1131:692ddf04fc42 56 valueBytes(initialTemp),
vcoubard 1131:692ddf04fc42 57 tempMeasurement(GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, (TemperatureValueBytes *)valueBytes.getPointer(), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
vcoubard 1131:692ddf04fc42 58 tempLocation(GattCharacteristic::UUID_TEMPERATURE_TYPE_CHAR, &_location) {
vcoubard 1131:692ddf04fc42 59
vcoubard 1131:692ddf04fc42 60 GattCharacteristic *hrmChars[] = {&tempMeasurement, &tempLocation, };
vcoubard 1131:692ddf04fc42 61 GattService hrmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
vcoubard 1131:692ddf04fc42 62
vcoubard 1131:692ddf04fc42 63 ble.addService(hrmService);
vcoubard 1131:692ddf04fc42 64 }
vcoubard 1131:692ddf04fc42 65
vcoubard 1131:692ddf04fc42 66 /**
vcoubard 1134:d540a48f650d 67 * @brief Update the temperature being broadcast.
vcoubard 1131:692ddf04fc42 68 *
vcoubard 1131:692ddf04fc42 69 * @param[in] temperature
vcoubard 1134:d540a48f650d 70 * Floating point value of the temperature.
vcoubard 1131:692ddf04fc42 71 *
vcoubard 1131:692ddf04fc42 72 */
vcoubard 1131:692ddf04fc42 73 void updateTemperature(float temperature) {
vcoubard 1131:692ddf04fc42 74 if (ble.getGapState().connected) {
vcoubard 1131:692ddf04fc42 75 valueBytes.updateTemperature(temperature);
vcoubard 1131:692ddf04fc42 76 ble.gattServer().write(tempMeasurement.getValueHandle(), valueBytes.getPointer(), sizeof(TemperatureValueBytes));
vcoubard 1131:692ddf04fc42 77 }
vcoubard 1131:692ddf04fc42 78 }
vcoubard 1131:692ddf04fc42 79
vcoubard 1131:692ddf04fc42 80 /**
vcoubard 1131:692ddf04fc42 81 * @brief Update the location.
vcoubard 1131:692ddf04fc42 82 * @param loc
vcoubard 1134:d540a48f650d 83 * New location value.
vcoubard 1131:692ddf04fc42 84 */
vcoubard 1131:692ddf04fc42 85 void updateLocation(SensorLocation_t loc) {
vcoubard 1131:692ddf04fc42 86 ble.gattServer().write(tempLocation.getValueHandle(), reinterpret_cast<uint8_t *>(&loc), sizeof(uint8_t));
vcoubard 1131:692ddf04fc42 87 }
vcoubard 1131:692ddf04fc42 88
vcoubard 1131:692ddf04fc42 89 private:
vcoubard 1134:d540a48f650d 90 /* Private internal representation for the bytes used to work with the vaulue of the temperature characteristic. */
vcoubard 1131:692ddf04fc42 91 struct TemperatureValueBytes {
vcoubard 1131:692ddf04fc42 92 static const unsigned OFFSET_OF_FLAGS = 0;
vcoubard 1131:692ddf04fc42 93 static const unsigned OFFSET_OF_VALUE = OFFSET_OF_FLAGS + sizeof(uint8_t);
vcoubard 1131:692ddf04fc42 94 static const unsigned SIZEOF_VALUE_BYTES = sizeof(uint8_t) + sizeof(float);
vcoubard 1131:692ddf04fc42 95
vcoubard 1131:692ddf04fc42 96 static const unsigned TEMPERATURE_UNITS_FLAG_POS = 0;
vcoubard 1131:692ddf04fc42 97 static const unsigned TIMESTAMP_FLAG_POS = 1;
vcoubard 1131:692ddf04fc42 98 static const unsigned TEMPERATURE_TYPE_FLAG_POS = 2;
vcoubard 1131:692ddf04fc42 99
vcoubard 1131:692ddf04fc42 100 static const uint8_t TEMPERATURE_UNITS_CELSIUS = 0;
vcoubard 1131:692ddf04fc42 101 static const uint8_t TEMPERATURE_UNITS_FAHRENHEIT = 1;
vcoubard 1131:692ddf04fc42 102
vcoubard 1131:692ddf04fc42 103 TemperatureValueBytes(float initialTemperature) : bytes() {
vcoubard 1134:d540a48f650d 104 /* Assumption: temperature values are expressed in celsius */
vcoubard 1131:692ddf04fc42 105 bytes[OFFSET_OF_FLAGS] = (TEMPERATURE_UNITS_CELSIUS << TEMPERATURE_UNITS_FLAG_POS) |
vcoubard 1131:692ddf04fc42 106 (false << TIMESTAMP_FLAG_POS) |
vcoubard 1131:692ddf04fc42 107 (false << TEMPERATURE_TYPE_FLAG_POS);
vcoubard 1131:692ddf04fc42 108 updateTemperature(initialTemperature);
vcoubard 1131:692ddf04fc42 109 }
vcoubard 1131:692ddf04fc42 110
vcoubard 1131:692ddf04fc42 111 void updateTemperature(float temp) {
vcoubard 1131:692ddf04fc42 112 uint32_t temp_ieee11073 = quick_ieee11073_from_float(temp);
vcoubard 1131:692ddf04fc42 113 memcpy(&bytes[OFFSET_OF_VALUE], &temp_ieee11073, sizeof(float));
vcoubard 1131:692ddf04fc42 114 }
vcoubard 1131:692ddf04fc42 115
vcoubard 1131:692ddf04fc42 116 uint8_t *getPointer(void) {
vcoubard 1131:692ddf04fc42 117 return bytes;
vcoubard 1131:692ddf04fc42 118 }
vcoubard 1131:692ddf04fc42 119
vcoubard 1131:692ddf04fc42 120 const uint8_t *getPointer(void) const {
vcoubard 1131:692ddf04fc42 121 return bytes;
vcoubard 1131:692ddf04fc42 122 }
vcoubard 1131:692ddf04fc42 123
vcoubard 1131:692ddf04fc42 124 private:
vcoubard 1131:692ddf04fc42 125 /**
vcoubard 1131:692ddf04fc42 126 * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type.
vcoubard 1131:692ddf04fc42 127 * @param temperature The temperature as a float.
vcoubard 1131:692ddf04fc42 128 * @return The temperature in 11073-20601 FLOAT-Type format.
vcoubard 1131:692ddf04fc42 129 */
vcoubard 1131:692ddf04fc42 130 uint32_t quick_ieee11073_from_float(float temperature) {
vcoubard 1134:d540a48f650d 131 uint8_t exponent = 0xFE; //Exponent is -2
vcoubard 1131:692ddf04fc42 132 uint32_t mantissa = (uint32_t)(temperature * 100);
vcoubard 1131:692ddf04fc42 133
vcoubard 1131:692ddf04fc42 134 return (((uint32_t)exponent) << 24) | mantissa;
vcoubard 1131:692ddf04fc42 135 }
vcoubard 1131:692ddf04fc42 136
vcoubard 1131:692ddf04fc42 137 private:
vcoubard 1134:d540a48f650d 138 /* First byte: 8-bit flags. Second field is a float holding the temperature value. */
vcoubard 1134:d540a48f650d 139 /* See https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
vcoubard 1131:692ddf04fc42 140 uint8_t bytes[SIZEOF_VALUE_BYTES];
vcoubard 1131:692ddf04fc42 141 };
vcoubard 1131:692ddf04fc42 142
vcoubard 1131:692ddf04fc42 143 protected:
vcoubard 1131:692ddf04fc42 144 BLE &ble;
vcoubard 1131:692ddf04fc42 145 TemperatureValueBytes valueBytes;
vcoubard 1131:692ddf04fc42 146 ReadOnlyGattCharacteristic<TemperatureValueBytes> tempMeasurement;
vcoubard 1131:692ddf04fc42 147 ReadOnlyGattCharacteristic<uint8_t> tempLocation;
vcoubard 1131:692ddf04fc42 148 };
vcoubard 1131:692ddf04fc42 149
rgrover1 712:b04b5db36865 150 #endif /* #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__*/