Keil Studio Cloud
Mistake on this page?
Report an issue in GitHub or email us
HealthThermometerService.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2020 ARM Limited
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 
19 /* MBED_DEPRECATED */
20 #warning "These services are deprecated and will be removed. Please see services.md for details about replacement services."
21 
22 #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__
23 #define __BLE_HEALTH_THERMOMETER_SERVICE_H__
24 
25 #include "ble/BLE.h"
26 #include "ble/Gap.h"
27 #include "ble/GattServer.h"
28 
29 #if BLE_FEATURE_GATT_SERVER
30 
31 /**
32 * @class HealthThermometerService
33 * @brief BLE Health Thermometer Service. This service provides the location of the thermometer and the temperature.
34 * Service: https://developer.bluetooth.org/gatt/profiles/Pages/ProfileViewer.aspx?u=org.bluetooth.profile.health_thermometer.xml
35 * Temperature Measurement: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml
36 * Temperature Type: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml
37 */
38 class HealthThermometerService {
39 public:
40  /**
41  * @brief Location of sensor on the body.
42  */
43  enum SensorLocation_t {
44  LOCATION_ARMPIT = 1, /*!< Armpit. */
45  LOCATION_BODY, /*!< Body. */
46  LOCATION_EAR, /*!< Ear. */
47  LOCATION_FINGER, /*!< Finger. */
48  LOCATION_GI_TRACT, /*!< GI tract */
49  LOCATION_MOUTH, /*!< Mouth. */
50  LOCATION_RECTUM, /*!< Rectum. */
51  LOCATION_TOE, /*!< Toe. */
52  LOCATION_EAR_DRUM, /*!< Eardrum. */
53  };
54 
55 public:
56  /**
57  * @brief Add the Health Thermometer Service to an existing BLE object, initialize with temperature and location.
58  * @param[in] _ble Reference to the BLE device.
59  * @param[in] initialTemp Initial value in celsius.
60  * @param[in] _location
61  */
62  HealthThermometerService(BLE &_ble, float initialTemp, uint8_t _location) :
63  ble(_ble),
64  valueBytes(initialTemp),
65  tempMeasurement(GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, (TemperatureValueBytes *)valueBytes.getPointer(), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE),
66  tempLocation(GattCharacteristic::UUID_TEMPERATURE_TYPE_CHAR, &_location) {
67 
68  GattCharacteristic *hrmChars[] = {&tempMeasurement, &tempLocation, };
69  GattService hrmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(hrmChars[0]));
70 
71  ble.gattServer().addService(hrmService);
72  }
73 
74  /**
75  * @brief Update the temperature being broadcast.
76  *
77  * @param[in] temperature
78  * Floating point value of the temperature.
79  *
80  */
81  void updateTemperature(float temperature) {
82  valueBytes.updateTemperature(temperature);
83  ble.gattServer().write(tempMeasurement.getValueHandle(), valueBytes.getPointer(), sizeof(TemperatureValueBytes));
84  }
85 
86  /**
87  * @brief Update the location.
88  * @param loc
89  * New location value.
90  */
91  void updateLocation(SensorLocation_t loc) {
92  ble.gattServer().write(tempLocation.getValueHandle(), reinterpret_cast<uint8_t *>(&loc), sizeof(uint8_t));
93  }
94 
95 private:
96  /* Private internal representation for the bytes used to work with the vaulue of the temperature characteristic. */
97  struct TemperatureValueBytes {
98  static const unsigned OFFSET_OF_FLAGS = 0;
99  static const unsigned OFFSET_OF_VALUE = OFFSET_OF_FLAGS + sizeof(uint8_t);
100  static const unsigned SIZEOF_VALUE_BYTES = sizeof(uint8_t) + sizeof(float);
101 
102  static const unsigned TEMPERATURE_UNITS_FLAG_POS = 0;
103  static const unsigned TIMESTAMP_FLAG_POS = 1;
104  static const unsigned TEMPERATURE_TYPE_FLAG_POS = 2;
105 
106  static const uint8_t TEMPERATURE_UNITS_CELSIUS = 0;
107  static const uint8_t TEMPERATURE_UNITS_FAHRENHEIT = 1;
108 
109  TemperatureValueBytes(float initialTemperature) : bytes() {
110  /* Assumption: temperature values are expressed in celsius */
111  bytes[OFFSET_OF_FLAGS] = (TEMPERATURE_UNITS_CELSIUS << TEMPERATURE_UNITS_FLAG_POS) |
112  (false << TIMESTAMP_FLAG_POS) |
113  (false << TEMPERATURE_TYPE_FLAG_POS);
114  updateTemperature(initialTemperature);
115  }
116 
117  void updateTemperature(float temp) {
118  uint32_t temp_ieee11073 = quick_ieee11073_from_float(temp);
119  memcpy(&bytes[OFFSET_OF_VALUE], &temp_ieee11073, sizeof(float));
120  }
121 
122  uint8_t *getPointer() {
123  return bytes;
124  }
125 
126  const uint8_t *getPointer() const {
127  return bytes;
128  }
129 
130 private:
131  /**
132  * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type.
133  * @param temperature The temperature as a float.
134  * @return The temperature in 11073-20601 FLOAT-Type format.
135  */
136  static uint32_t quick_ieee11073_from_float(float temperature) {
137  uint8_t exponent = 0xFE; //Exponent is -2
138  uint32_t mantissa = (uint32_t)(temperature * 100);
139 
140  return (((uint32_t)exponent) << 24) | mantissa;
141  }
142 
143 private:
144  /* First byte: 8-bit flags. Second field is a float holding the temperature value. */
145  /* See https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
146  uint8_t bytes[SIZEOF_VALUE_BYTES];
147  };
148 
149 protected:
150  BLE &ble;
151  TemperatureValueBytes valueBytes;
152  ReadOnlyGattCharacteristic<TemperatureValueBytes> tempMeasurement;
153  ReadOnlyGattCharacteristic<uint8_t> tempLocation;
154 };
155 
156 #endif // BLE_FEATURE_GATT_SERVER
157 
158 #endif /* #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__*/
HealthThermometerService::updateTemperature
void updateTemperature(float temperature)
Update the temperature being broadcast.
Definition: HealthThermometerService.h:81
GattService::UUID_HEALTH_THERMOMETER_SERVICE
UUID of the health thermometer.
Definition: gatt/GattService.h:86
GattCharacteristic::getValueHandle
GattAttribute::Handle_t getValueHandle() const
Get the characteristic&#39;s value attribute handle in the ATT table.
Definition: gatt/GattCharacteristic.h:1741
HealthThermometerService::SensorLocation_t
SensorLocation_t
Location of sensor on the body.
Definition: HealthThermometerService.h:43
HealthThermometerService
BLE Health Thermometer Service.
Definition: HealthThermometerService.h:38
GattCharacteristic
Representation of a GattServer characteristic.
Definition: gatt/GattCharacteristic.h:105
HealthThermometerService::updateLocation
void updateLocation(SensorLocation_t loc)
Update the location.
Definition: HealthThermometerService.h:91
GattService
Representation of a GattServer service.
Definition: gatt/GattService.h:40
ble
Entry namespace for all BLE API definitions.
Definition: CyH4TransportDriver.h:34
ble::BLE
Abstract away BLE-capable radio transceivers or SOCs.
Definition: BLE.h:137
HealthThermometerService::HealthThermometerService
HealthThermometerService(BLE &_ble, float initialTemp, uint8_t _location)
Add the Health Thermometer Service to an existing BLE object, initialize with temperature and locatio...
Definition: HealthThermometerService.h:62
Important Information for this Arm website

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. If you are not happy with the use of these cookies, please review our Cookie Policy to learn how they can be disabled. By disabling cookies, some features of the site will not work.