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/HeartRateService.h@1025:5ae5dc18bc84, 2015-12-10 (annotated)

Committer:
rgrover1
Date:
Thu Dec 10 09:15:02 2015 +0000
Revision:
1025:5ae5dc18bc84
Parent:
1024:438b06bbca04
Child:
1028:9dc2ab644517
Synchronized with git rev 9d3cd74b

Author: Rohit Grover

Merge pull request #129 from iriark01/patch-10



Edit

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_HEART_RATE_SERVICE_H__
rgrover1 712:b04b5db36865 18 #define __BLE_HEART_RATE_SERVICE_H__
rgrover1 712:b04b5db36865 19
rgrover1 712:b04b5db36865 20 #include "ble/BLE.h"
rgrover1 712:b04b5db36865 21
rgrover1 712:b04b5db36865 22 /**
rgrover1 712:b04b5db36865 23 * @class HeartRateService
rgrover1 1025:5ae5dc18bc84 24 * @brief BLE Service for HeartRate. This BLE Service contains the location of the sensor and the heart rate in beats per minute.
rgrover1 1025:5ae5dc18bc84 25 * Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml
rgrover1 1025:5ae5dc18bc84 26 * HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml
rgrover1 712:b04b5db36865 27 * Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml
rgrover1 712:b04b5db36865 28 */
rgrover1 712:b04b5db36865 29 class HeartRateService {
rgrover1 712:b04b5db36865 30 public:
rgrover1 712:b04b5db36865 31 /**
rgrover1 712:b04b5db36865 32 * @enum SensorLocation
rgrover1 1025:5ae5dc18bc84 33 * @brief Location of the heart rate sensor on body.
rgrover1 712:b04b5db36865 34 */
rgrover1 712:b04b5db36865 35 enum {
rgrover1 1025:5ae5dc18bc84 36 LOCATION_OTHER = 0, /*!< Other location. */
rgrover1 1025:5ae5dc18bc84 37 LOCATION_CHEST, /*!< Chest. */
rgrover1 1025:5ae5dc18bc84 38 LOCATION_WRIST, /*!< Wrist. */
rgrover1 1025:5ae5dc18bc84 39 LOCATION_FINGER, /*!< Finger. */
rgrover1 1025:5ae5dc18bc84 40 LOCATION_HAND, /*!< Hand. */
rgrover1 1025:5ae5dc18bc84 41 LOCATION_EAR_LOBE, /*!< Earlobe. */
rgrover1 1025:5ae5dc18bc84 42 LOCATION_FOOT, /*!< Foot. */
rgrover1 712:b04b5db36865 43 };
rgrover1 712:b04b5db36865 44
rgrover1 712:b04b5db36865 45 public:
rgrover1 712:b04b5db36865 46 /**
rgrover1 1025:5ae5dc18bc84 47 * @brief Constructor with 8-bit HRM Counter value.
rgrover1 712:b04b5db36865 48 *
rgrover1 712:b04b5db36865 49 * @param[ref] _ble
rgrover1 712:b04b5db36865 50 * Reference to the underlying BLE.
rgrover1 712:b04b5db36865 51 * @param[in] hrmCounter (8-bit)
rgrover1 1025:5ae5dc18bc84 52 * Initial value for the HRM counter.
rgrover1 712:b04b5db36865 53 * @param[in] location
rgrover1 712:b04b5db36865 54 * Sensor's location.
rgrover1 712:b04b5db36865 55 */
rgrover1 712:b04b5db36865 56 HeartRateService(BLE &_ble, uint8_t hrmCounter, uint8_t location) :
rgrover1 712:b04b5db36865 57 ble(_ble),
rgrover1 712:b04b5db36865 58 valueBytes(hrmCounter),
rgrover1 712:b04b5db36865 59 hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
rgrover1 712:b04b5db36865 60 valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
rgrover1 712:b04b5db36865 61 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
rgrover1 712:b04b5db36865 62 hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, &location),
rgrover1 712:b04b5db36865 63 controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, &controlPointValue) {
rgrover1 712:b04b5db36865 64 setupService();
rgrover1 712:b04b5db36865 65 }
rgrover1 712:b04b5db36865 66
rgrover1 712:b04b5db36865 67 /**
rgrover1 712:b04b5db36865 68 * @brief Constructor with a 16-bit HRM Counter value.
rgrover1 712:b04b5db36865 69 *
rgrover1 712:b04b5db36865 70 * @param[in] _ble
rgrover1 712:b04b5db36865 71 * Reference to the underlying BLE.
rgrover1 712:b04b5db36865 72 * @param[in] hrmCounter (8-bit)
rgrover1 1025:5ae5dc18bc84 73 * Initial value for the HRM counter.
rgrover1 712:b04b5db36865 74 * @param[in] location
rgrover1 712:b04b5db36865 75 * Sensor's location.
rgrover1 712:b04b5db36865 76 */
rgrover1 712:b04b5db36865 77 HeartRateService(BLE &_ble, uint16_t hrmCounter, uint8_t location) :
rgrover1 712:b04b5db36865 78 ble(_ble),
rgrover1 712:b04b5db36865 79 valueBytes(hrmCounter),
rgrover1 712:b04b5db36865 80 hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
rgrover1 712:b04b5db36865 81 valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
rgrover1 712:b04b5db36865 82 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
rgrover1 712:b04b5db36865 83 hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, &location),
rgrover1 712:b04b5db36865 84 controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, &controlPointValue) {
rgrover1 712:b04b5db36865 85 setupService();
rgrover1 712:b04b5db36865 86 }
rgrover1 712:b04b5db36865 87
rgrover1 712:b04b5db36865 88 /**
rgrover1 1025:5ae5dc18bc84 89 * @brief Set a new 8-bit value for the heart rate.
rgrover1 712:b04b5db36865 90 *
rgrover1 712:b04b5db36865 91 * @param[in] hrmCounter
rgrover1 1025:5ae5dc18bc84 92 * Heart rate in BPM.
rgrover1 712:b04b5db36865 93 */
rgrover1 712:b04b5db36865 94 void updateHeartRate(uint8_t hrmCounter) {
rgrover1 712:b04b5db36865 95 valueBytes.updateHeartRate(hrmCounter);
rgrover1 728:997ba5e7b3b6 96 ble.gattServer().write(hrmRate.getValueHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
rgrover1 712:b04b5db36865 97 }
rgrover1 712:b04b5db36865 98
rgrover1 712:b04b5db36865 99 /**
rgrover1 1025:5ae5dc18bc84 100 * Set a new 16-bit value for the heart rate.
rgrover1 712:b04b5db36865 101 *
rgrover1 712:b04b5db36865 102 * @param[in] hrmCounter
rgrover1 1025:5ae5dc18bc84 103 * Heart rate in BPM.
rgrover1 712:b04b5db36865 104 */
rgrover1 712:b04b5db36865 105 void updateHeartRate(uint16_t hrmCounter) {
rgrover1 712:b04b5db36865 106 valueBytes.updateHeartRate(hrmCounter);
rgrover1 728:997ba5e7b3b6 107 ble.gattServer().write(hrmRate.getValueHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
rgrover1 712:b04b5db36865 108 }
rgrover1 712:b04b5db36865 109
rgrover1 712:b04b5db36865 110 /**
rgrover1 1025:5ae5dc18bc84 111 * This callback allows the heart rate service to receive updates to the
rgrover1 1025:5ae5dc18bc84 112 * controlPoint characteristic.
rgrover1 712:b04b5db36865 113 *
rgrover1 712:b04b5db36865 114 * @param[in] params
rgrover1 712:b04b5db36865 115 * Information about the characterisitc being updated.
rgrover1 712:b04b5db36865 116 */
rgrover1 712:b04b5db36865 117 virtual void onDataWritten(const GattWriteCallbackParams *params) {
rgrover1 712:b04b5db36865 118 if (params->handle == controlPoint.getValueAttribute().getHandle()) {
rgrover1 712:b04b5db36865 119 /* Do something here if the new value is 1; else you can override this method by
rgrover1 712:b04b5db36865 120 * extending this class.
rgrover1 1025:5ae5dc18bc84 121 * @NOTE: If you are extending this class, be sure to also call
rgrover1 712:b04b5db36865 122 * ble.onDataWritten(this, &ExtendedHRService::onDataWritten); in
rgrover1 712:b04b5db36865 123 * your constructor.
rgrover1 712:b04b5db36865 124 */
rgrover1 712:b04b5db36865 125 }
rgrover1 712:b04b5db36865 126 }
rgrover1 712:b04b5db36865 127
rgrover1 712:b04b5db36865 128 protected:
rgrover1 712:b04b5db36865 129 void setupService(void) {
rgrover1 712:b04b5db36865 130 GattCharacteristic *charTable[] = {&hrmRate, &hrmLocation, &controlPoint};
rgrover1 712:b04b5db36865 131 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
rgrover1 712:b04b5db36865 132
rgrover1 712:b04b5db36865 133 ble.addService(hrmService);
rgrover1 712:b04b5db36865 134 ble.onDataWritten(this, &HeartRateService::onDataWritten);
rgrover1 712:b04b5db36865 135 }
rgrover1 712:b04b5db36865 136
rgrover1 712:b04b5db36865 137 protected:
rgrover1 1025:5ae5dc18bc84 138 /* Private internal representation for the bytes used to work with the value of the heart rate characteristic. */
rgrover1 712:b04b5db36865 139 struct HeartRateValueBytes {
rgrover1 1025:5ae5dc18bc84 140 static const unsigned MAX_VALUE_BYTES = 3; /* Flags, and up to two bytes for heart rate. */
rgrover1 712:b04b5db36865 141 static const unsigned FLAGS_BYTE_INDEX = 0;
rgrover1 712:b04b5db36865 142
rgrover1 712:b04b5db36865 143 static const unsigned VALUE_FORMAT_BITNUM = 0;
rgrover1 712:b04b5db36865 144 static const uint8_t VALUE_FORMAT_FLAG = (1 << VALUE_FORMAT_BITNUM);
rgrover1 712:b04b5db36865 145
rgrover1 712:b04b5db36865 146 HeartRateValueBytes(uint8_t hrmCounter) : valueBytes() {
rgrover1 712:b04b5db36865 147 updateHeartRate(hrmCounter);
rgrover1 712:b04b5db36865 148 }
rgrover1 712:b04b5db36865 149
rgrover1 712:b04b5db36865 150 HeartRateValueBytes(uint16_t hrmCounter) : valueBytes() {
rgrover1 712:b04b5db36865 151 updateHeartRate(hrmCounter);
rgrover1 712:b04b5db36865 152 }
rgrover1 712:b04b5db36865 153
rgrover1 712:b04b5db36865 154 void updateHeartRate(uint8_t hrmCounter) {
rgrover1 712:b04b5db36865 155 valueBytes[FLAGS_BYTE_INDEX] &= ~VALUE_FORMAT_FLAG;
rgrover1 712:b04b5db36865 156 valueBytes[FLAGS_BYTE_INDEX + 1] = hrmCounter;
rgrover1 712:b04b5db36865 157 }
rgrover1 712:b04b5db36865 158
rgrover1 712:b04b5db36865 159 void updateHeartRate(uint16_t hrmCounter) {
rgrover1 712:b04b5db36865 160 valueBytes[FLAGS_BYTE_INDEX] |= VALUE_FORMAT_FLAG;
rgrover1 712:b04b5db36865 161 valueBytes[FLAGS_BYTE_INDEX + 1] = (uint8_t)(hrmCounter & 0xFF);
rgrover1 712:b04b5db36865 162 valueBytes[FLAGS_BYTE_INDEX + 2] = (uint8_t)(hrmCounter >> 8);
rgrover1 712:b04b5db36865 163 }
rgrover1 712:b04b5db36865 164
rgrover1 712:b04b5db36865 165 uint8_t *getPointer(void) {
rgrover1 712:b04b5db36865 166 return valueBytes;
rgrover1 712:b04b5db36865 167 }
rgrover1 712:b04b5db36865 168
rgrover1 712:b04b5db36865 169 const uint8_t *getPointer(void) const {
rgrover1 712:b04b5db36865 170 return valueBytes;
rgrover1 712:b04b5db36865 171 }
rgrover1 712:b04b5db36865 172
rgrover1 712:b04b5db36865 173 unsigned getNumValueBytes(void) const {
rgrover1 712:b04b5db36865 174 return 1 + ((valueBytes[FLAGS_BYTE_INDEX] & VALUE_FORMAT_FLAG) ? sizeof(uint16_t) : sizeof(uint8_t));
rgrover1 712:b04b5db36865 175 }
rgrover1 712:b04b5db36865 176
rgrover1 712:b04b5db36865 177 private:
rgrover1 1025:5ae5dc18bc84 178 /* First byte: 8-bit values, no extra info. Second byte: uint8_t HRM value */
rgrover1 1025:5ae5dc18bc84 179 /* See https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
rgrover1 712:b04b5db36865 180 uint8_t valueBytes[MAX_VALUE_BYTES];
rgrover1 712:b04b5db36865 181 };
rgrover1 712:b04b5db36865 182
rgrover1 712:b04b5db36865 183 protected:
rgrover1 712:b04b5db36865 184 BLE &ble;
rgrover1 712:b04b5db36865 185
rgrover1 712:b04b5db36865 186 HeartRateValueBytes valueBytes;
rgrover1 712:b04b5db36865 187 uint8_t controlPointValue;
rgrover1 712:b04b5db36865 188
rgrover1 712:b04b5db36865 189 GattCharacteristic hrmRate;
rgrover1 712:b04b5db36865 190 ReadOnlyGattCharacteristic<uint8_t> hrmLocation;
rgrover1 712:b04b5db36865 191 WriteOnlyGattCharacteristic<uint8_t> controlPoint;
rgrover1 712:b04b5db36865 192 };
rgrover1 712:b04b5db36865 193
rgrover1 712:b04b5db36865 194 #endif /* #ifndef __BLE_HEART_RATE_SERVICE_H__*/