Lancaster University / BLE_API

Lancaster University's fork of the mbed BLE API. Lives on github, https://github.com/lancaster-university/BLE_API

Dependents:   microbit-dal microbit-dal microbit-ble-open microbit-dal ... more

Fork of BLE_API by Bluetooth Low Energy

ble/services/HealthThermometerService.h@1131:73c11a85c6d6, 2016-04-06 (annotated)

Committer:
LancasterUniversity
Date:
Wed Apr 06 18:40:26 2016 +0100
Revision:
1131:73c11a85c6d6
Parent:
1056:ce2fb3d09929
Child:
1134:faa0160c87ff
Synchronized with git rev 13bf70b6

Author: Rohit Grover

Release 2.1.5

=============



A minor release to separate the concept of minlen and len in

GattCharacteristic. Also contains some improvements to documentation.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rgrover1 712:b04b5db36865 1 /* mbed Microcontroller Library
rgrover1 712:b04b5db36865 2 * Copyright (c) 2006-2013 ARM Limited
rgrover1 712:b04b5db36865 3 *
rgrover1 712:b04b5db36865 4 * Licensed under the Apache License, Version 2.0 (the "License");
rgrover1 712:b04b5db36865 5 * you may not use this file except in compliance with the License.
rgrover1 712:b04b5db36865 6 * You may obtain a copy of the License at
rgrover1 712:b04b5db36865 7 *
rgrover1 712:b04b5db36865 8 * http://www.apache.org/licenses/LICENSE-2.0
rgrover1 712:b04b5db36865 9 *
rgrover1 712:b04b5db36865 10 * Unless required by applicable law or agreed to in writing, software
rgrover1 712:b04b5db36865 11 * distributed under the License is distributed on an "AS IS" BASIS,
rgrover1 712:b04b5db36865 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rgrover1 712:b04b5db36865 13 * See the License for the specific language governing permissions and
rgrover1 712:b04b5db36865 14 * limitations under the License.
rgrover1 712:b04b5db36865 15 */
rgrover1 712:b04b5db36865 16
rgrover1 712:b04b5db36865 17 #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__
rgrover1 712:b04b5db36865 18 #define __BLE_HEALTH_THERMOMETER_SERVICE_H__
rgrover1 712:b04b5db36865 19
rgrover1 912:f728aa46e7df 20 #include "ble/BLE.h"
rgrover1 712:b04b5db36865 21
rgrover1 712:b04b5db36865 22 /**
rgrover1 712:b04b5db36865 23 * @class HealthThermometerService
LancasterUniversity 1131:73c11a85c6d6 24 * @brief BLE Health Thermometer Service. This service provides the location of the thermometer and the temperature. <br>
LancasterUniversity 1131:73c11a85c6d6 25 * Service: https://developer.bluetooth.org/gatt/profiles/Pages/ProfileViewer.aspx?u=org.bluetooth.profile.health_thermometer.xml <br>
LancasterUniversity 1131:73c11a85c6d6 26 * Temperature Measurement: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml <br>
rgrover1 712:b04b5db36865 27 * Temperature Type: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml
rgrover1 712:b04b5db36865 28 */
rgrover1 712:b04b5db36865 29 class HealthThermometerService {
rgrover1 712:b04b5db36865 30 public:
rgrover1 712:b04b5db36865 31 /**
LancasterUniversity 1131:73c11a85c6d6 32 * @enum Sensor Location
LancasterUniversity 1131:73c11a85c6d6 33 * @brief Location of sensor on the body
rgrover1 712:b04b5db36865 34 */
rgrover1 712:b04b5db36865 35 enum SensorLocation_t {
LancasterUniversity 1131:73c11a85c6d6 36 LOCATION_ARMPIT = 1, /*!< armpit */
LancasterUniversity 1131:73c11a85c6d6 37 LOCATION_BODY, /*!< body */
LancasterUniversity 1131:73c11a85c6d6 38 LOCATION_EAR, /*!< ear */
LancasterUniversity 1131:73c11a85c6d6 39 LOCATION_FINGER, /*!< finger */
rgrover1 712:b04b5db36865 40 LOCATION_GI_TRACT, /*!< GI tract */
LancasterUniversity 1131:73c11a85c6d6 41 LOCATION_MOUTH, /*!< mouth */
LancasterUniversity 1131:73c11a85c6d6 42 LOCATION_RECTUM, /*!< rectum */
LancasterUniversity 1131:73c11a85c6d6 43 LOCATION_TOE, /*!< toe */
LancasterUniversity 1131:73c11a85c6d6 44 LOCATION_EAR_DRUM, /*!< ear drum */
rgrover1 712:b04b5db36865 45 };
rgrover1 712:b04b5db36865 46
rgrover1 712:b04b5db36865 47 public:
rgrover1 712:b04b5db36865 48 /**
LancasterUniversity 1131:73c11a85c6d6 49 * @brief Add the Health Thermometer Service to an existing ble object, initialize with temperature and location.
LancasterUniversity 1131:73c11a85c6d6 50 * @param[ref] _ble reference to the BLE device
LancasterUniversity 1131:73c11a85c6d6 51 * @param[in] initialTemp initial value in celsius
rgrover1 712:b04b5db36865 52 * @param[in] _location
rgrover1 712:b04b5db36865 53 */
rgrover1 712:b04b5db36865 54 HealthThermometerService(BLE &_ble, float initialTemp, uint8_t _location) :
rgrover1 712:b04b5db36865 55 ble(_ble),
rgrover1 712:b04b5db36865 56 valueBytes(initialTemp),
rgrover1 712:b04b5db36865 57 tempMeasurement(GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, (TemperatureValueBytes *)valueBytes.getPointer(), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
rgrover1 712:b04b5db36865 58 tempLocation(GattCharacteristic::UUID_TEMPERATURE_TYPE_CHAR, &_location) {
rgrover1 712:b04b5db36865 59
rgrover1 712:b04b5db36865 60 GattCharacteristic *hrmChars[] = {&tempMeasurement, &tempLocation, };
rgrover1 712:b04b5db36865 61 GattService hrmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
rgrover1 712:b04b5db36865 62
rgrover1 712:b04b5db36865 63 ble.addService(hrmService);
rgrover1 712:b04b5db36865 64 }
rgrover1 712:b04b5db36865 65
rgrover1 712:b04b5db36865 66 /**
LancasterUniversity 1131:73c11a85c6d6 67 * @brief Update the temperature being broadcast
rgrover1 712:b04b5db36865 68 *
rgrover1 712:b04b5db36865 69 * @param[in] temperature
LancasterUniversity 1131:73c11a85c6d6 70 * Floating point value of the temperature
rgrover1 712:b04b5db36865 71 *
rgrover1 712:b04b5db36865 72 */
rgrover1 712:b04b5db36865 73 void updateTemperature(float temperature) {
rgrover1 712:b04b5db36865 74 if (ble.getGapState().connected) {
rgrover1 712:b04b5db36865 75 valueBytes.updateTemperature(temperature);
rgrover1 728:997ba5e7b3b6 76 ble.gattServer().write(tempMeasurement.getValueHandle(), valueBytes.getPointer(), sizeof(TemperatureValueBytes));
rgrover1 712:b04b5db36865 77 }
rgrover1 712:b04b5db36865 78 }
rgrover1 712:b04b5db36865 79
rgrover1 712:b04b5db36865 80 /**
rgrover1 712:b04b5db36865 81 * @brief Update the location.
rgrover1 712:b04b5db36865 82 * @param loc
LancasterUniversity 1131:73c11a85c6d6 83 * new location value.
rgrover1 712:b04b5db36865 84 */
rgrover1 712:b04b5db36865 85 void updateLocation(SensorLocation_t loc) {
rgrover1 728:997ba5e7b3b6 86 ble.gattServer().write(tempLocation.getValueHandle(), reinterpret_cast<uint8_t *>(&loc), sizeof(uint8_t));
rgrover1 712:b04b5db36865 87 }
rgrover1 712:b04b5db36865 88
rgrover1 712:b04b5db36865 89 private:
LancasterUniversity 1131:73c11a85c6d6 90 /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
rgrover1 712:b04b5db36865 91 struct TemperatureValueBytes {
rgrover1 712:b04b5db36865 92 static const unsigned OFFSET_OF_FLAGS = 0;
rgrover1 712:b04b5db36865 93 static const unsigned OFFSET_OF_VALUE = OFFSET_OF_FLAGS + sizeof(uint8_t);
rgrover1 712:b04b5db36865 94 static const unsigned SIZEOF_VALUE_BYTES = sizeof(uint8_t) + sizeof(float);
rgrover1 712:b04b5db36865 95
rgrover1 712:b04b5db36865 96 static const unsigned TEMPERATURE_UNITS_FLAG_POS = 0;
rgrover1 712:b04b5db36865 97 static const unsigned TIMESTAMP_FLAG_POS = 1;
rgrover1 712:b04b5db36865 98 static const unsigned TEMPERATURE_TYPE_FLAG_POS = 2;
rgrover1 712:b04b5db36865 99
rgrover1 712:b04b5db36865 100 static const uint8_t TEMPERATURE_UNITS_CELSIUS = 0;
rgrover1 712:b04b5db36865 101 static const uint8_t TEMPERATURE_UNITS_FAHRENHEIT = 1;
rgrover1 712:b04b5db36865 102
rgrover1 712:b04b5db36865 103 TemperatureValueBytes(float initialTemperature) : bytes() {
LancasterUniversity 1131:73c11a85c6d6 104 /* assumption: temperature values are expressed in Celsius */
rgrover1 712:b04b5db36865 105 bytes[OFFSET_OF_FLAGS] = (TEMPERATURE_UNITS_CELSIUS << TEMPERATURE_UNITS_FLAG_POS) |
rgrover1 712:b04b5db36865 106 (false << TIMESTAMP_FLAG_POS) |
rgrover1 712:b04b5db36865 107 (false << TEMPERATURE_TYPE_FLAG_POS);
rgrover1 712:b04b5db36865 108 updateTemperature(initialTemperature);
rgrover1 712:b04b5db36865 109 }
rgrover1 712:b04b5db36865 110
rgrover1 712:b04b5db36865 111 void updateTemperature(float temp) {
rgrover1 712:b04b5db36865 112 uint32_t temp_ieee11073 = quick_ieee11073_from_float(temp);
rgrover1 712:b04b5db36865 113 memcpy(&bytes[OFFSET_OF_VALUE], &temp_ieee11073, sizeof(float));
rgrover1 712:b04b5db36865 114 }
rgrover1 712:b04b5db36865 115
rgrover1 712:b04b5db36865 116 uint8_t *getPointer(void) {
rgrover1 712:b04b5db36865 117 return bytes;
rgrover1 712:b04b5db36865 118 }
rgrover1 712:b04b5db36865 119
rgrover1 712:b04b5db36865 120 const uint8_t *getPointer(void) const {
rgrover1 712:b04b5db36865 121 return bytes;
rgrover1 712:b04b5db36865 122 }
rgrover1 712:b04b5db36865 123
rgrover1 712:b04b5db36865 124 private:
rgrover1 712:b04b5db36865 125 /**
rgrover1 712:b04b5db36865 126 * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type.
rgrover1 712:b04b5db36865 127 * @param temperature The temperature as a float.
rgrover1 712:b04b5db36865 128 * @return The temperature in 11073-20601 FLOAT-Type format.
rgrover1 712:b04b5db36865 129 */
rgrover1 712:b04b5db36865 130 uint32_t quick_ieee11073_from_float(float temperature) {
LancasterUniversity 1131:73c11a85c6d6 131 uint8_t exponent = 0xFE; //exponent is -2
rgrover1 712:b04b5db36865 132 uint32_t mantissa = (uint32_t)(temperature * 100);
rgrover1 712:b04b5db36865 133
rgrover1 712:b04b5db36865 134 return (((uint32_t)exponent) << 24) | mantissa;
rgrover1 712:b04b5db36865 135 }
rgrover1 712:b04b5db36865 136
rgrover1 712:b04b5db36865 137 private:
LancasterUniversity 1131:73c11a85c6d6 138 /* First byte = 8-bit flags, Second field is a float holding the temperature value. */
LancasterUniversity 1131:73c11a85c6d6 139 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
rgrover1 712:b04b5db36865 140 uint8_t bytes[SIZEOF_VALUE_BYTES];
rgrover1 712:b04b5db36865 141 };
rgrover1 712:b04b5db36865 142
rgrover1 728:997ba5e7b3b6 143 protected:
rgrover1 712:b04b5db36865 144 BLE &ble;
rgrover1 712:b04b5db36865 145 TemperatureValueBytes valueBytes;
rgrover1 712:b04b5db36865 146 ReadOnlyGattCharacteristic<TemperatureValueBytes> tempMeasurement;
rgrover1 712:b04b5db36865 147 ReadOnlyGattCharacteristic<uint8_t> tempLocation;
rgrover1 712:b04b5db36865 148 };
rgrover1 712:b04b5db36865 149
rgrover1 712:b04b5db36865 150 #endif /* #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__*/