mainwindow.cpp Example File
can/mainwindow.cpp/**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the examples of the QtSerialBus module. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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 "mainwindow.h" #include "ui_mainwindow.h" #include "settingsdialog.h" #include <QCanBusFrame> #include <QCanBus> #include <QtCore/qbytearray.h> #include <QtCore/qvariant.h> #include <QtCore/qdebug.h> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), m_ui(new Ui::MainWindow), m_canDevice(Q_NULLPTR) { m_ui->setupUi(this); m_settings = new SettingsDialog; m_status = new QLabel; m_ui->statusBar->addWidget(m_status); m_ui->sendMessagesBox->setEnabled(false); initActionsConnections(); connect(m_ui->sendButton, &QPushButton::clicked, this, &MainWindow::sendMessage); } MainWindow::~MainWindow() { if (m_canDevice) delete m_canDevice; delete m_settings; delete m_ui; } void MainWindow::showStatusMessage(const QString &message) { m_status->setText(message); } void MainWindow::initActionsConnections() { m_ui->actionConnect->setEnabled(true); m_ui->actionDisconnect->setEnabled(false); m_ui->actionQuit->setEnabled(true); m_ui->actionConfigure->setEnabled(true); connect(m_ui->actionConnect, &QAction::triggered, this, &MainWindow::connectDevice); connect(m_ui->actionDisconnect, &QAction::triggered, this, &MainWindow::disconnectDevice); connect(m_ui->actionQuit, SIGNAL(triggered()), this, SLOT(close())); connect(m_ui->actionConfigure, &QAction::triggered, m_settings, &SettingsDialog::show); connect(m_ui->actionAboutQt, &QAction::triggered, qApp, &QApplication::aboutQt); } void MainWindow::receiveError(QCanBusDevice::CanBusError error) const { switch (error) { case QCanBusDevice::ReadError: case QCanBusDevice::WriteError: case QCanBusDevice::ConnectionError: case QCanBusDevice::ConfigurationError: case QCanBusDevice::UnknownError: qWarning() << m_canDevice->errorString(); default: break; } } void MainWindow::connectDevice() { const SettingsDialog::Settings p = m_settings->settings(); m_canDevice = QCanBus::instance()->createDevice(p.backendName.toLocal8Bit(), p.deviceInterfaceName); if (!m_canDevice) { showStatusMessage(tr("Connection error")); return; } connect(m_canDevice, &QCanBusDevice::errorOccurred, this, &MainWindow::receiveError); connect(m_canDevice, &QCanBusDevice::framesReceived, this, &MainWindow::checkMessages); connect(m_canDevice, &QCanBusDevice::framesWritten, this, &MainWindow::framesWritten); if (p.useConfigurationEnabled) { foreach (const SettingsDialog::ConfigurationItem &item, p.configurations) m_canDevice->setConfigurationParameter(item.first, item.second); } if (!m_canDevice->connectDevice()) { delete m_canDevice; m_canDevice = Q_NULLPTR; showStatusMessage(tr("Connection error")); } else { m_ui->actionConnect->setEnabled(false); m_ui->actionDisconnect->setEnabled(true); m_ui->actionConfigure->setEnabled(false); m_ui->sendMessagesBox->setEnabled(true); showStatusMessage(tr("Backend: %1, Connected to: %2") .arg(p.backendName).arg(p.deviceInterfaceName)); } } void MainWindow::disconnectDevice() { if (!m_canDevice) return; m_canDevice->disconnectDevice(); delete m_canDevice; m_canDevice = Q_NULLPTR; m_ui->actionConnect->setEnabled(true); m_ui->actionDisconnect->setEnabled(false); m_ui->actionConfigure->setEnabled(true); m_ui->sendMessagesBox->setEnabled(false); showStatusMessage(tr("Disconnected")); } void MainWindow::framesWritten(qint64 count) { qDebug() << "Number of frames written:" << count; } void MainWindow::checkMessages() { if (!m_canDevice) return; const QCanBusFrame frame = m_canDevice->readFrame(); if (frame.payload().isEmpty()) return; const qint8 dataLength = frame.payload().size(); const qint32 id = frame.frameId(); QString view; if (frame.frameType() == QCanBusFrame::ErrorFrame) { interpretError(view, frame); } else { view += QLatin1String("Id: "); view += QString::number(id, 16); view += QLatin1String(" bytes: "); view += QString::number(dataLength, 10); view += QLatin1String(" data: "); view += frame.payload().data(); } if (frame.frameType() == QCanBusFrame::RemoteRequestFrame) { m_ui->requestList->addItem(view); } else if (frame.frameType() == QCanBusFrame::ErrorFrame) { m_ui->errorList->addItem(view); } else { m_ui->listWidget->addItem(view); } } void MainWindow::sendMessage() const { if (!m_canDevice) return; QByteArray writings = m_ui->lineEdit->displayText().toUtf8(); QCanBusFrame frame; const int maxPayload = m_ui->fdBox->checkState() ? 64 : 8; int size = writings.size(); if (size > maxPayload) size = maxPayload; writings = writings.left(size); frame.setPayload(writings); qint32 id = m_ui->idEdit->displayText().toInt(); if (!m_ui->EFF->checkState() && id > 2047) //11 bits id = 2047; frame.setFrameId(id); frame.setExtendedFrameFormat(m_ui->EFF->checkState()); if (m_ui->remoteFrame->isChecked()) frame.setFrameType(QCanBusFrame::RemoteRequestFrame); else if (m_ui->errorFrame->isChecked()) frame.setFrameType(QCanBusFrame::ErrorFrame); else frame.setFrameType(QCanBusFrame::DataFrame); m_canDevice->writeFrame(frame); } void MainWindow::interpretError(QString &view, const QCanBusFrame &frame) { if (!m_canDevice) return; view = m_canDevice->interpretErrorFrame(frame); }