Bill Schilit / BLE_API

Improve readability with getHandle inline

Fork of BLE_API by Bluetooth Low Energy

services/HeartRateService.h@245:98f930d14515, 2014-12-09 (annotated)

Committer:
rgrover1
Date:
Tue Dec 09 13:15:19 2014 +0000
Revision:
245:98f930d14515
Parent:
244:0e9201b67e2f 
Synchronized with git rev ba5fb7fb

Author: Rohit Grover

minor improvements to documentation.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rohit Grover 118:620d28e7a1ba 1 /* mbed Microcontroller Library
Rohit Grover 118:620d28e7a1ba 2 * Copyright (c) 2006-2013 ARM Limited
Rohit Grover 118:620d28e7a1ba 3 *
Rohit Grover 118:620d28e7a1ba 4 * Licensed under the Apache License, Version 2.0 (the "License");
Rohit Grover 118:620d28e7a1ba 5 * you may not use this file except in compliance with the License.
Rohit Grover 118:620d28e7a1ba 6 * You may obtain a copy of the License at
Rohit Grover 118:620d28e7a1ba 7 *
Rohit Grover 118:620d28e7a1ba 8 * http://www.apache.org/licenses/LICENSE-2.0
Rohit Grover 118:620d28e7a1ba 9 *
Rohit Grover 118:620d28e7a1ba 10 * Unless required by applicable law or agreed to in writing, software
Rohit Grover 118:620d28e7a1ba 11 * distributed under the License is distributed on an "AS IS" BASIS,
Rohit Grover 118:620d28e7a1ba 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Rohit Grover 118:620d28e7a1ba 13 * See the License for the specific language governing permissions and
Rohit Grover 118:620d28e7a1ba 14 * limitations under the License.
Rohit Grover 118:620d28e7a1ba 15 */
Rohit Grover 118:620d28e7a1ba 16
Rohit Grover 118:620d28e7a1ba 17 #ifndef __BLE_HEART_RATE_SERVICE_H__
Rohit Grover 118:620d28e7a1ba 18 #define __BLE_HEART_RATE_SERVICE_H__
Rohit Grover 118:620d28e7a1ba 19
Rohit Grover 118:620d28e7a1ba 20 #include "BLEDevice.h"
Rohit Grover 118:620d28e7a1ba 21
rgrover1 244:0e9201b67e2f 22 /**
mbedAustin 236:aac647674384 23 * @class HeartRateService
rgrover1 244:0e9201b67e2f 24 * @brief BLE Service for HeartRate. This BLE Service contains the location of the sensor, the heartrate in beats per minute. <br>
mbedAustin 236:aac647674384 25 * Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml <br>
mbedAustin 236:aac647674384 26 * HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml <br>
rgrover1 244:0e9201b67e2f 27 * Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml
mbedAustin 236:aac647674384 28 */
Rohit Grover 118:620d28e7a1ba 29 class HeartRateService {
Rohit Grover 118:620d28e7a1ba 30 public:
mbedAustin 236:aac647674384 31 /**
mbedAustin 236:aac647674384 32 * @enum SensorLocation
rgrover1 244:0e9201b67e2f 33 * @brief Location of HeartRate sensor on body.
mbedAustin 236:aac647674384 34 */
Rohit Grover 118:620d28e7a1ba 35 enum {
mbedAustin 236:aac647674384 36 LOCATION_OTHER = 0, /*!< Other Location */
mbedAustin 236:aac647674384 37 LOCATION_CHEST, /*!< Chest */
mbedAustin 236:aac647674384 38 LOCATION_WRIST, /*!< Wrist */
mbedAustin 236:aac647674384 39 LOCATION_FINGER, /*!< Finger */
mbedAustin 236:aac647674384 40 LOCATION_HAND, /*!< Hand */
mbedAustin 236:aac647674384 41 LOCATION_EAR_LOBE, /*!< Earlobe */
mbedAustin 236:aac647674384 42 LOCATION_FOOT, /*!< Foot */
Rohit Grover 118:620d28e7a1ba 43 };
Rohit Grover 118:620d28e7a1ba 44
Rohit Grover 118:620d28e7a1ba 45 public:
Rohit Grover 118:620d28e7a1ba 46 /**
rgrover1 244:0e9201b67e2f 47 * @brief Constructor with 8bit HRM Counter value.
Rohit Grover 118:620d28e7a1ba 48 *
mbedAustin 236:aac647674384 49 * @param[ref] _ble
Rohit Grover 118:620d28e7a1ba 50 * Reference to the underlying BLEDevice.
mbedAustin 236:aac647674384 51 * @param[in] hrmCounter (8-bit)
Rohit Grover 118:620d28e7a1ba 52 * initial value for the hrm counter.
mbedAustin 236:aac647674384 53 * @param[in] location
Rohit Grover 118:620d28e7a1ba 54 * Sensor's location.
Rohit Grover 118:620d28e7a1ba 55 */
Rohit Grover 118:620d28e7a1ba 56 HeartRateService(BLEDevice &_ble, uint8_t hrmCounter, uint8_t location) :
Rohit Grover 118:620d28e7a1ba 57 ble(_ble),
Rohit Grover 118:620d28e7a1ba 58 valueBytes(hrmCounter),
Rohit Grover 118:620d28e7a1ba 59 hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
Rohit Grover 118:620d28e7a1ba 60 valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
Rohit Grover 118:620d28e7a1ba 61 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
Rohit Grover 118:620d28e7a1ba 62 hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, (uint8_t *)&location, sizeof(location), sizeof(location),
Rohit Grover 118:620d28e7a1ba 63 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ),
Rohit Grover 118:620d28e7a1ba 64 controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, (uint8_t *)&controlPointValue,
Rohit Grover 118:620d28e7a1ba 65 sizeof(controlPointValue), sizeof(controlPointValue), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE) {
Rohit Grover 118:620d28e7a1ba 66 setupService();
Rohit Grover 118:620d28e7a1ba 67 }
Rohit Grover 118:620d28e7a1ba 68
Rohit Grover 118:620d28e7a1ba 69 /**
rgrover1 244:0e9201b67e2f 70 * @brief Constructor with a 16-bit HRM Counter value.
mbedAustin 236:aac647674384 71 *
mbedAustin 236:aac647674384 72 * @param[in] _ble
mbedAustin 236:aac647674384 73 * Reference to the underlying BLEDevice.
mbedAustin 236:aac647674384 74 * @param[in] hrmCounter (8-bit)
mbedAustin 236:aac647674384 75 * initial value for the hrm counter.
mbedAustin 236:aac647674384 76 * @param[in] location
mbedAustin 236:aac647674384 77 * Sensor's location.
Rohit Grover 118:620d28e7a1ba 78 */
Rohit Grover 118:620d28e7a1ba 79 HeartRateService(BLEDevice &_ble, uint16_t hrmCounter, uint8_t location) :
Rohit Grover 118:620d28e7a1ba 80 ble(_ble),
Rohit Grover 118:620d28e7a1ba 81 valueBytes(hrmCounter),
Rohit Grover 118:620d28e7a1ba 82 hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
Rohit Grover 118:620d28e7a1ba 83 valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
Rohit Grover 118:620d28e7a1ba 84 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
Rohit Grover 118:620d28e7a1ba 85 hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, (uint8_t *)&location, sizeof(location), sizeof(location),
Rohit Grover 118:620d28e7a1ba 86 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ),
Rohit Grover 118:620d28e7a1ba 87 controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, (uint8_t *)&controlPointValue,
Rohit Grover 118:620d28e7a1ba 88 sizeof(controlPointValue), sizeof(controlPointValue), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE) {
Rohit Grover 118:620d28e7a1ba 89 setupService();
Rohit Grover 118:620d28e7a1ba 90 }
Rohit Grover 118:620d28e7a1ba 91
Rohit Grover 118:620d28e7a1ba 92 /**
rgrover1 244:0e9201b67e2f 93 * @brief Set a new 8-bit value for heart rate.
mbedAustin 236:aac647674384 94 *
mbedAustin 236:aac647674384 95 * @param[in] hrmCounter
rgrover1 244:0e9201b67e2f 96 * HeartRate in bpm.
Rohit Grover 118:620d28e7a1ba 97 */
Rohit Grover 118:620d28e7a1ba 98 void updateHeartRate(uint8_t hrmCounter) {
Rohit Grover 118:620d28e7a1ba 99 valueBytes.updateHeartRate(hrmCounter);
Rohit Grover 118:620d28e7a1ba 100 ble.updateCharacteristicValue(hrmRate.getValueAttribute().getHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
Rohit Grover 118:620d28e7a1ba 101 }
Rohit Grover 118:620d28e7a1ba 102
Rohit Grover 118:620d28e7a1ba 103 /**
Rohit Grover 118:620d28e7a1ba 104 * Set a new 16-bit value for heart rate.
mbedAustin 236:aac647674384 105 *
mbedAustin 236:aac647674384 106 * @param[in] hrmCounter
rgrover1 244:0e9201b67e2f 107 * HeartRate in bpm.
Rohit Grover 118:620d28e7a1ba 108 */
Rohit Grover 118:620d28e7a1ba 109 void updateHeartRate(uint16_t hrmCounter) {
Rohit Grover 118:620d28e7a1ba 110 valueBytes.updateHeartRate(hrmCounter);
Rohit Grover 118:620d28e7a1ba 111 ble.updateCharacteristicValue(hrmRate.getValueAttribute().getHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
Rohit Grover 118:620d28e7a1ba 112 }
Rohit Grover 118:620d28e7a1ba 113
Rohit Grover 118:620d28e7a1ba 114 /**
Rohit Grover 123:fede41ce9407 115 * This callback allows the HeartRateService to receive updates to the
Rohit Grover 123:fede41ce9407 116 * controlPoint Characteristic.
rgrover1 244:0e9201b67e2f 117 *
rgrover1 245:98f930d14515 118 * @param[in] params
rgrover1 245:98f930d14515 119 * Information about the characterisitc being updated.
Rohit Grover 118:620d28e7a1ba 120 */
Rohit Grover 118:620d28e7a1ba 121 virtual void onDataWritten(const GattCharacteristicWriteCBParams *params) {
Rohit Grover 118:620d28e7a1ba 122 if (params->charHandle == controlPoint.getValueAttribute().getHandle()) {
Rohit Grover 118:620d28e7a1ba 123 /* Do something here if the new value is 1; else you can override this method by
Rohit Grover 118:620d28e7a1ba 124 * extending this class.
Rohit Grover 118:620d28e7a1ba 125 * @NOTE: if you are extending this class, be sure to also call
Rohit Grover 118:620d28e7a1ba 126 * ble.onDataWritten(this, &ExtendedHRService::onDataWritten); in
Rohit Grover 118:620d28e7a1ba 127 * your constructor.
Rohit Grover 118:620d28e7a1ba 128 */
Rohit Grover 118:620d28e7a1ba 129 }
Rohit Grover 118:620d28e7a1ba 130 }
Rohit Grover 118:620d28e7a1ba 131
Rohit Grover 118:620d28e7a1ba 132 private:
Rohit Grover 118:620d28e7a1ba 133 void setupService(void) {
Rohit Grover 118:620d28e7a1ba 134 static bool serviceAdded = false; /* We should only ever need to add the heart rate service once. */
Rohit Grover 118:620d28e7a1ba 135 if (serviceAdded) {
Rohit Grover 118:620d28e7a1ba 136 return;
Rohit Grover 118:620d28e7a1ba 137 }
Rohit Grover 118:620d28e7a1ba 138
Rohit Grover 118:620d28e7a1ba 139 GattCharacteristic *charTable[] = {&hrmRate, &hrmLocation, &controlPoint};
Rohit Grover 118:620d28e7a1ba 140 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
Rohit Grover 118:620d28e7a1ba 141
Rohit Grover 118:620d28e7a1ba 142 ble.addService(hrmService);
Rohit Grover 118:620d28e7a1ba 143 serviceAdded = true;
Rohit Grover 118:620d28e7a1ba 144
Rohit Grover 118:620d28e7a1ba 145 ble.onDataWritten(this, &HeartRateService::onDataWritten);
Rohit Grover 118:620d28e7a1ba 146 }
Rohit Grover 118:620d28e7a1ba 147
Rohit Grover 118:620d28e7a1ba 148 private:
Rohit Grover 118:620d28e7a1ba 149 /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
Rohit Grover 118:620d28e7a1ba 150 struct HeartRateValueBytes {
Rohit Grover 118:620d28e7a1ba 151 static const unsigned MAX_VALUE_BYTES = 3; /* FLAGS + up to two bytes for heart-rate */
Rohit Grover 118:620d28e7a1ba 152 static const unsigned FLAGS_BYTE_INDEX = 0;
Rohit Grover 118:620d28e7a1ba 153
Rohit Grover 118:620d28e7a1ba 154 static const unsigned VALUE_FORMAT_BITNUM = 0;
Rohit Grover 118:620d28e7a1ba 155 static const uint8_t VALUE_FORMAT_FLAG = (1 << VALUE_FORMAT_BITNUM);
Rohit Grover 118:620d28e7a1ba 156
Rohit Grover 118:620d28e7a1ba 157 HeartRateValueBytes(uint8_t hrmCounter) : valueBytes() {
Rohit Grover 118:620d28e7a1ba 158 updateHeartRate(hrmCounter);
Rohit Grover 118:620d28e7a1ba 159 }
Rohit Grover 118:620d28e7a1ba 160
Rohit Grover 118:620d28e7a1ba 161 HeartRateValueBytes(uint16_t hrmCounter) : valueBytes() {
Rohit Grover 118:620d28e7a1ba 162 updateHeartRate(hrmCounter);
Rohit Grover 118:620d28e7a1ba 163 }
Rohit Grover 118:620d28e7a1ba 164
Rohit Grover 118:620d28e7a1ba 165 void updateHeartRate(uint8_t hrmCounter) {
rgrover1 244:0e9201b67e2f 166 valueBytes[FLAGS_BYTE_INDEX] &= ~VALUE_FORMAT_FLAG;
Rohit Grover 118:620d28e7a1ba 167 valueBytes[FLAGS_BYTE_INDEX + 1] = hrmCounter;
Rohit Grover 118:620d28e7a1ba 168 }
Rohit Grover 118:620d28e7a1ba 169
Rohit Grover 118:620d28e7a1ba 170 void updateHeartRate(uint16_t hrmCounter) {
rgrover1 244:0e9201b67e2f 171 valueBytes[FLAGS_BYTE_INDEX] |= VALUE_FORMAT_FLAG;
Rohit Grover 118:620d28e7a1ba 172 valueBytes[FLAGS_BYTE_INDEX + 1] = (uint8_t)(hrmCounter & 0xFF);
Rohit Grover 118:620d28e7a1ba 173 valueBytes[FLAGS_BYTE_INDEX + 2] = (uint8_t)(hrmCounter >> 8);
Rohit Grover 118:620d28e7a1ba 174 }
Rohit Grover 118:620d28e7a1ba 175
rgrover1 244:0e9201b67e2f 176 uint8_t *getPointer(void) {
Rohit Grover 118:620d28e7a1ba 177 return valueBytes;
Rohit Grover 118:620d28e7a1ba 178 }
Rohit Grover 118:620d28e7a1ba 179
Rohit Grover 118:620d28e7a1ba 180 const uint8_t *getPointer(void) const {
Rohit Grover 118:620d28e7a1ba 181 return valueBytes;
Rohit Grover 118:620d28e7a1ba 182 }
Rohit Grover 118:620d28e7a1ba 183
rgrover1 244:0e9201b67e2f 184 unsigned getNumValueBytes(void) const {
Rohit Grover 118:620d28e7a1ba 185 return 1 + ((valueBytes[FLAGS_BYTE_INDEX] & VALUE_FORMAT_FLAG) ? sizeof(uint16_t) : sizeof(uint8_t));
Rohit Grover 118:620d28e7a1ba 186 }
Rohit Grover 118:620d28e7a1ba 187
rgrover1 244:0e9201b67e2f 188 private:
Rohit Grover 118:620d28e7a1ba 189 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
Rohit Grover 118:620d28e7a1ba 190 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 118:620d28e7a1ba 191 uint8_t valueBytes[MAX_VALUE_BYTES];
Rohit Grover 118:620d28e7a1ba 192 };
Rohit Grover 118:620d28e7a1ba 193
Rohit Grover 118:620d28e7a1ba 194 private:
Rohit Grover 118:620d28e7a1ba 195 BLEDevice &ble;
Rohit Grover 118:620d28e7a1ba 196 HeartRateValueBytes valueBytes;
Rohit Grover 118:620d28e7a1ba 197 uint8_t controlPointValue;
Rohit Grover 118:620d28e7a1ba 198 GattCharacteristic hrmRate;
Rohit Grover 118:620d28e7a1ba 199 GattCharacteristic hrmLocation;
Rohit Grover 118:620d28e7a1ba 200 GattCharacteristic controlPoint;
Rohit Grover 118:620d28e7a1ba 201 };
Rohit Grover 118:620d28e7a1ba 202
rgrover1 244:0e9201b67e2f 203 #endif /* #ifndef __BLE_HEART_RATE_SERVICE_H__*/