heartrate.cpp Example File
heartlistener/heartrate.cpp/*************************************************************************** ** ** Copyright (C) 2014 BlackBerry Limited. All rights reserved. ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the examples of the QtBluetooth module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** You may use this file under the terms of the BSD license as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "heartrate.h" #include <QtEndian> HeartRate::HeartRate(): m_currentDevice(QBluetoothDeviceInfo()), foundHeartRateService(false), m_max(0), m_min(0), calories(0), m_control(0), timer(0), m_service(0) { m_deviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(this); connect(m_deviceDiscoveryAgent, SIGNAL(deviceDiscovered(const QBluetoothDeviceInfo&)), this, SLOT(addDevice(const QBluetoothDeviceInfo&))); connect(m_deviceDiscoveryAgent, SIGNAL(error(QBluetoothDeviceDiscoveryAgent::Error)), this, SLOT(deviceScanError(QBluetoothDeviceDiscoveryAgent::Error))); connect(m_deviceDiscoveryAgent, SIGNAL(finished()), this, SLOT(scanFinished())); // initialize random seed for demo mode qsrand(QTime::currentTime().msec()); } HeartRate::~HeartRate() { qDeleteAll(m_devices); m_devices.clear(); } void HeartRate::deviceSearch() { qDeleteAll(m_devices); m_devices.clear(); m_deviceDiscoveryAgent->start(); setMessage("Scanning for devices..."); } void HeartRate::addDevice(const QBluetoothDeviceInfo &device) { if (device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) { qWarning() << "Discovered LE Device name: " << device.name() << " Address: " << device.address().toString(); DeviceInfo *dev = new DeviceInfo(device); m_devices.append(dev); setMessage("Low Energy device found. Scanning for more..."); } //... } void HeartRate::scanFinished() { if (m_devices.size() == 0) setMessage("No Low Energy devices found"); Q_EMIT nameChanged(); } void HeartRate::deviceScanError(QBluetoothDeviceDiscoveryAgent::Error error) { if (error == QBluetoothDeviceDiscoveryAgent::PoweredOffError) setMessage("The Bluetooth adaptor is powered off, power it on before doing discovery."); else if (error == QBluetoothDeviceDiscoveryAgent::InputOutputError) setMessage("Writing or reading from the device resulted in an error."); else setMessage("An unknown error has occurred."); } void HeartRate::setMessage(QString message) { m_info = message; Q_EMIT messageChanged(); } QString HeartRate::message() const { return m_info; } QVariant HeartRate::name() { return QVariant::fromValue(m_devices); } void HeartRate::connectToService(const QString &address) { m_measurements.clear(); bool deviceFound = false; for (int i = 0; i < m_devices.size(); i++) { if (((DeviceInfo*)m_devices.at(i))->getAddress() == address ) { m_currentDevice.setDevice(((DeviceInfo*)m_devices.at(i))->getDevice()); setMessage("Connecting to device..."); deviceFound = true; break; } } // we are running demo mode if (!deviceFound) { startDemo(); return; } if (m_control) { m_control->disconnectFromDevice(); delete m_control; m_control = 0; } m_control = new QLowEnergyController(m_currentDevice.getDevice(), this); connect(m_control, SIGNAL(serviceDiscovered(QBluetoothUuid)), this, SLOT(serviceDiscovered(QBluetoothUuid))); connect(m_control, SIGNAL(discoveryFinished()), this, SLOT(serviceScanDone())); connect(m_control, SIGNAL(error(QLowEnergyController::Error)), this, SLOT(controllerError(QLowEnergyController::Error))); connect(m_control, SIGNAL(connected()), this, SLOT(deviceConnected())); connect(m_control, SIGNAL(disconnected()), this, SLOT(deviceDisconnected())); m_control->connectToDevice(); } void HeartRate::deviceConnected() { m_control->discoverServices(); } void HeartRate::deviceDisconnected() { setMessage("Heart Rate service disconnected"); qWarning() << "Remote device disconnected"; } void HeartRate::serviceDiscovered(const QBluetoothUuid &gatt) { if (gatt == QBluetoothUuid(QBluetoothUuid::HeartRate)) { setMessage("Heart Rate service discovered. Waiting for service scan to be done..."); foundHeartRateService = true; } } void HeartRate::serviceScanDone() { delete m_service; m_service = 0; if (foundHeartRateService) { setMessage("Connecting to service..."); m_service = m_control->createServiceObject( QBluetoothUuid(QBluetoothUuid::HeartRate), this); } if (!m_service) { setMessage("Heart Rate Service not found."); return; } connect(m_service, SIGNAL(stateChanged(QLowEnergyService::ServiceState)), this, SLOT(serviceStateChanged(QLowEnergyService::ServiceState))); connect(m_service, SIGNAL(characteristicChanged(QLowEnergyCharacteristic,QByteArray)), this, SLOT(updateHeartRateValue(QLowEnergyCharacteristic,QByteArray))); connect(m_service, SIGNAL(descriptorWritten(QLowEnergyDescriptor,QByteArray)), this, SLOT(confirmedDescriptorWrite(QLowEnergyDescriptor,QByteArray))); m_service->discoverDetails(); } void HeartRate::disconnectService() { foundHeartRateService = false; m_stop = QDateTime::currentDateTime(); if (m_devices.isEmpty()) { if (timer) timer->stop(); return; } //disable notifications before disconnecting if (m_notificationDesc.isValid() && m_service && m_notificationDesc.value() == QByteArray::fromHex("0100")) { m_service->writeDescriptor(m_notificationDesc, QByteArray::fromHex("0000")); } else { m_control->disconnectFromDevice(); delete m_service; m_service = 0; } } void HeartRate::controllerError(QLowEnergyController::Error error) { setMessage("Cannot connect to remote device."); qWarning() << "Controller Error:" << error; } void HeartRate::serviceStateChanged(QLowEnergyService::ServiceState s) { switch (s) { case QLowEnergyService::ServiceDiscovered: { const QLowEnergyCharacteristic hrChar = m_service->characteristic( QBluetoothUuid(QBluetoothUuid::HeartRateMeasurement)); if (!hrChar.isValid()) { setMessage("HR Data not found."); break; } m_notificationDesc = hrChar.descriptor( QBluetoothUuid::ClientCharacteristicConfiguration); if (m_notificationDesc.isValid()) { m_service->writeDescriptor(m_notificationDesc, QByteArray::fromHex("0100")); setMessage("Measuring"); m_start = QDateTime::currentDateTime(); } break; } default: //nothing for now break; } } void HeartRate::serviceError(QLowEnergyService::ServiceError e) { switch (e) { case QLowEnergyService::DescriptorWriteError: setMessage("Cannot obtain HR notifications"); break; default: qWarning() << "HR service error:" << e; } } void HeartRate::updateHeartRateValue(const QLowEnergyCharacteristic &c, const QByteArray &value) { // ignore any other characteristic change -> shouldn't really happen though if (c.uuid() != QBluetoothUuid(QBluetoothUuid::HeartRateMeasurement)) return; const quint8 *data = reinterpret_cast<const quint8 *>(value.constData()); quint8 flags = data[0]; //Heart Rate if (flags & 0x1) { // HR 16 bit? otherwise 8 bit const quint16 heartRate = qFromLittleEndian<quint16>(data[1]); //qDebug() << "16 bit HR value:" << heartRate; m_measurements.append(heartRate); } else { const quint8 *heartRate = &data[1]; m_measurements.append(*heartRate); //qDebug() << "8 bit HR value:" << *heartRate; } //Energy Expended if (flags & 0x8) { int index = (flags & 0x1) ? 5 : 3; const quint16 energy = qFromLittleEndian<quint16>(data[index]); qDebug() << "Used Energy:" << energy; } Q_EMIT hrChanged(); } void HeartRate::confirmedDescriptorWrite(const QLowEnergyDescriptor &d, const QByteArray &value) { if (d.isValid() && d == m_notificationDesc && value == QByteArray::fromHex("0000")) { //disabled notifications -> assume disconnect intent m_control->disconnectFromDevice(); delete m_service; m_service = 0; } } int HeartRate::hR() const { if (m_measurements.isEmpty()) return 0; return m_measurements.last(); } void HeartRate::obtainResults() { Q_EMIT timeChanged(); Q_EMIT averageChanged(); Q_EMIT caloriesChanged(); } int HeartRate::time() { return m_start.secsTo(m_stop); } int HeartRate::maxHR() const { return m_max; } int HeartRate::minHR() const { return m_min; } float HeartRate::average() { if (m_measurements.size() == 0) { return 0; } else { m_max = 0; m_min = 1000; int sum = 0; for (int i = 0; i < m_measurements.size(); i++) { sum += (int) m_measurements.value(i); if (((int)m_measurements.value(i)) > m_max) m_max = (int)m_measurements.value(i); if (((int)m_measurements.value(i)) < m_min) m_min = (int)m_measurements.value(i); } return sum/m_measurements.size(); } } int HeartRate::measurements(int index) const { if (index > m_measurements.size()) return 0; else return (int)m_measurements.value(index); } int HeartRate::measurementsSize() const { return m_measurements.size(); } QString HeartRate::deviceAddress() const { return m_currentDevice.getAddress(); } float HeartRate::caloriesCalculation() { calories = ((-55.0969 + (0.6309 * average()) + (0.1988 * 94) + (0.2017 * 24)) / 4.184) * 60 * time()/3600 ; return calories; } int HeartRate::numDevices() const { return m_devices.size(); } void HeartRate::startDemo() { m_start = QDateTime::currentDateTime(); if (!timer) { timer = new QTimer(this); connect(timer, SIGNAL(timeout()), this, SLOT(receiveDemo())); } timer->start(1000); setMessage("This is Demo mode"); } void HeartRate::receiveDemo() { m_measurements.append(randomPulse()); Q_EMIT hrChanged(); } int HeartRate::randomPulse() const { // random number between 50 and 70 return qrand() % (70 - 50) + 50; }
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