// maximize window

    if (settings->value(SG_MainWindow_Maximized).toBool())

    {

        showMaximized();

    }

    // load toolbar/dockwidgets state

    restoreState(settings->value(SG_MainWindow_State).toByteArray());

    settings->setValue(SG_MainWindow_State, saveState());

    settings->endGroup();

}

void MainWindow::onSaveSettings()

{

    QString fileName = QFileDialog::getSaveFileName(

        this, tr("Save Settings"), QString(), "INI (*.ini)");

    if (!fileName.isNull()) // user canceled

    {

        QSettings settings(fileName, QSettings::IniFormat);

        saveAllSettings(&settings);

    }

}

void MainWindow::onLoadSettings()

{

    QString fileName = QFileDialog::getOpenFileName(

        this, tr("Load Settings"), QString(), "INI (*.ini)");

    if (!fileName.isNull()) // user canceled

    {

        QSettings settings(fileName, QSettings::IniFormat);

        loadAllSettings(&settings);

    }

}

void MainWindow::handleCommandLineOptions(const QCoreApplication &app)

{

    QCommandLineParser parser;

    parser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsCompactedShortOptions);

    parser.setApplicationDescription("Small and simple software for plotting data from serial port in realtime.");

    parser.addHelpOption();

    parser.addVersionOption();

    QCommandLineOption loadOpt({"l", "load"}, "Load settings from file.", "filename");

    QCommandLineOption portOpt({"p", "port"}, "Set port name.", "port name");

    QCommandLineOption openPortOpt({"o", "open"}, "Open serial port.");

    parser.addOption(loadOpt);

    parser.addOption(portOpt);

    parser.addOption(baudrateOpt);

    parser.addOption(openPortOpt);

    parser.process(app);

    if (parser.isSet(loadOpt))

    {

        QString fileName = parser.value(loadOpt);

        QFileInfo fileInfo(fileName);

        if (fileInfo.exists() && fileInfo.isFile())

        {

            QSettings settings(fileName, QSettings::IniFormat);

            loadAllSettings(&settings);

        }

        else

        {

            qWarning() << "Ini file not exist";

        }

    }

    if (parser.isSet(portOpt))

    {

        portControl.selectPort(parser.value(portOpt));

    }

    if (parser.isSet(baudrateOpt))

    {

        portControl.selectBaudrate(parser.value(baudrateOpt));

    }

    if (parser.isSet(openPortOpt))

    {

        portControl.openPort();

    }

}

// setting mappings

const QMap<QSerialPort::Parity, QString> paritySettingMap({

        {QSerialPort::NoParity, "none"},

        {QSerialPort::OddParity, "odd"},

        {QSerialPort::EvenParity, "even"},

    });

PortControl::PortControl(QSerialPort* port, QWidget* parent) :

    QWidget(parent),

    ui(new Ui::PortControl),

    portToolBar("Port Toolbar"),

    openAction("Open", this),

    loadPortListAction("↺", this)

{

    ui->setupUi(this);

    serialPort = port;

    connect(serialPort, SIGNAL(error(QSerialPort::SerialPortError)),

            this, SLOT(onPortError(QSerialPort::SerialPortError)));

    // setup actions

    openAction.setCheckable(true);

    openAction.setShortcut(QKeySequence("F12"));

    openAction.setToolTip("Open Port");

    QObject::connect(&openAction, &QAction::triggered,

                     this, &PortControl::openActionTriggered);

    loadPortListAction.setToolTip("Reload port list");

    QObject::connect(&loadPortListAction, &QAction::triggered,

                     [this](bool checked){loadPortList();});

    // setup toolbar

    portToolBar.addWidget(&tbPortList);

    portToolBar.addAction(&loadPortListAction);

    portToolBar.addAction(&openAction);

    // setup port selection widgets

    tbPortList.setMinimumWidth(TBPORTLIST_MINWIDTH);

    tbPortList.setModel(&portList);

    ui->cbPortList->setModel(&portList);

    QObject::connect(ui->cbPortList,

                     SELECT<int>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::onCbPortListActivated);

    QObject::connect(&tbPortList,

                     SELECT<int>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::onTbPortListActivated);

    QObject::connect(ui->cbPortList,

                     SELECT<const QString&>::OVERLOAD_OF(&QComboBox::activated),

    QObject::connect(&tbPortList,

                     SELECT<const QString&>::OVERLOAD_OF(&QComboBox::activated),

    // setup buttons

    ui->pbOpenPort->setDefaultAction(&openAction);

    ui->pbReloadPorts->setDefaultAction(&loadPortListAction);

    // setup baud rate selection widget

    QObject::connect(ui->cbBaudRate,

                     SELECT<const QString&>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::_selectBaudRate);

    // setup parity selection buttons

    parityButtons.addButton(ui->rbNoParity, (int) QSerialPort::NoParity);

    parityButtons.addButton(ui->rbEvenParity, (int) QSerialPort::EvenParity);

    parityButtons.addButton(ui->rbOddParity, (int) QSerialPort::OddParity);

    QObject::connect(&parityButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectParity);

    // setup data bits selection buttons

    dataBitsButtons.addButton(ui->rb8Bits, (int) QSerialPort::Data8);

    dataBitsButtons.addButton(ui->rb7Bits, (int) QSerialPort::Data7);

    dataBitsButtons.addButton(ui->rb6Bits, (int) QSerialPort::Data6);

    dataBitsButtons.addButton(ui->rb5Bits, (int) QSerialPort::Data5);

    QObject::connect(&dataBitsButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectDataBits);

    // setup stop bits selection buttons

    stopBitsButtons.addButton(ui->rb1StopBit, (int) QSerialPort::OneStop);

    stopBitsButtons.addButton(ui->rb2StopBit, (int) QSerialPort::TwoStop);

    QObject::connect(&stopBitsButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectStopBits);

    // setup flow control selection buttons

    flowControlButtons.addButton(ui->rbNoFlowControl,

                                 (int) QSerialPort::NoFlowControl);

    flowControlButtons.addButton(ui->rbHardwareControl,

                                 (int) QSerialPort::HardwareControl);

    flowControlButtons.addButton(ui->rbSoftwareControl,

                                 (int) QSerialPort::SoftwareControl);

    QObject::connect(&flowControlButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectFlowControl);

    else

    {

        // we get the port name from the edit text, which may not be

        // in the portList if user hasn't pressed Enter

        // Also note that, portText may not be the `portName`

        QString portText = ui->cbPortList->currentText();

        QString portName;

        int portIndex = portList.indexOf(portText);

        if (portIndex < 0) // not in list, add to model and update the selections

        {

            portList.appendRow(new PortListItem(portText));

            ui->cbPortList->setCurrentIndex(portList.rowCount()-1);

            tbPortList.setCurrentIndex(portList.rowCount()-1);

            portName = portText;

        }

        else

        {

            // get the port name from the data field

            portName = static_cast<PortListItem*>(portList.item(portIndex))->portName();

        }

        serialPort->setPortName(ui->cbPortList->currentData(PortNameRole).toString());

        // open port

        if (serialPort->open(QIODevice::ReadWrite))

        {

            // set port settings

            _selectBaudRate(ui->cbBaudRate->currentText());

            selectParity((QSerialPort::Parity) parityButtons.checkedId());

            selectDataBits((QSerialPort::DataBits) dataBitsButtons.checkedId());

            selectStopBits((QSerialPort::StopBits) stopBitsButtons.checkedId());

            selectFlowControl((QSerialPort::FlowControl) flowControlButtons.checkedId());

            // set output signals

            serialPort->setDataTerminalReady(ui->ledDTR->isOn());

            serialPort->setRequestToSend(ui->ledRTS->isOn());

            // update pin signals

            updatePinLeds();

            pinUpdateTimer.start();

            qDebug() << "Opened port:" << serialPort->portName();

            emit portToggled(true);

        }

    }

    openAction.setChecked(serialPort->isOpen());

}

{

    // portName may be coming from combobox

    portName = portName.split(" ")[0];

    // has selection actually changed

    if (portName != serialPort->portName())

    {

        // if another port is already open, close it by toggling

        if (serialPort->isOpen())

        {

            togglePort();

            // open new selection by toggling

            togglePort();

        }

    }

}

QString PortControl::selectedPortName()

{

    QString portText = ui->cbPortList->currentText();

    int portIndex = portList.indexOf(portText);

    if (portIndex < 0) // not in the list yet

    {

        // return the displayed name as port name

        return portText;

    }

    else

    {

        // get the port name from the 'port list'

        return static_cast<PortListItem*>(portList.item(portIndex))->portName();

    }

}

QToolBar* PortControl::toolBar()

{

    return &portToolBar;

}

void PortControl::openActionTriggered(bool checked)

{

    togglePort();

}

void PortControl::onCbPortListActivated(int index)

{

    tbPortList.setCurrentIndex(index);

}

            if (isPtsInvalidArgErr())

                break;

#endif

            qCritical() << "Unknown error! Error: " << serialPort->errorString();

            break;

        default:

            qCritical() << "Unhandled port error: " << error;

            break;

    }

}

void PortControl::updatePinLeds(void)

{

    auto pins = serialPort->pinoutSignals();

    ui->ledDCD->setOn(pins & QSerialPort::DataCarrierDetectSignal);

    ui->ledDSR->setOn(pins & QSerialPort::DataSetReadySignal);

    ui->ledRI->setOn(pins & QSerialPort::RingIndicatorSignal);

    ui->ledCTS->setOn(pins & QSerialPort::ClearToSendSignal);

}

QString PortControl::currentParityText()

{

    return paritySettingMap.value(

        (QSerialPort::Parity) parityButtons.checkedId());

}

QString PortControl::currentFlowControlText()

{

    if (flowControlButtons.checkedId() == QSerialPort::HardwareControl)

    {

        return "hardware";

    }

    else if (flowControlButtons.checkedId() == QSerialPort::SoftwareControl)

    {

        return "software";

    }

    else // no parity

    {

        return "none";

    }

}

void PortControl::selectPort(QString portName)

{

    int portIndex = portList.indexOfName(portName);

    if (portIndex < 0) // not in list, add to model and update the selections

    {

        portList.appendRow(new PortListItem(portName));

    }

}

void PortControl::selectBaudrate(QString baudRate)

{

    int baudRateIndex = ui->cbBaudRate->findText(baudRate);

    if (baudRateIndex < 0)

    {

        ui->cbBaudRate->setCurrentText(baudRate);

    }

    else

    {

        ui->cbBaudRate->setCurrentIndex(baudRateIndex);

    }

    _selectBaudRate(baudRate);

}

void PortControl::openPort()

{

    if (!serialPort->isOpen())

    {

        openAction.trigger();

    }

}

void PortControl::saveSettings(QSettings* settings)

{

    settings->beginGroup(SettingGroup_Port);

    settings->setValue(SG_Port_SelectedPort, selectedPortName());

    settings->setValue(SG_Port_BaudRate, ui->cbBaudRate->currentText());

    settings->setValue(SG_Port_Parity, currentParityText());

    settings->setValue(SG_Port_DataBits, dataBitsButtons.checkedId());

    settings->setValue(SG_Port_StopBits, stopBitsButtons.checkedId());

    settings->setValue(SG_Port_FlowControl, currentFlowControlText());

    settings->endGroup();

}

void PortControl::loadSettings(QSettings* settings)

{

    // make sure the port is closed

    if (serialPort->isOpen()) togglePort();

    settings->beginGroup(SettingGroup_Port);

    // set port name if it exists in the current list otherwise ignore

    QString portName = settings->value(SG_Port_SelectedPort, QString()).toString();

    if (!portName.isEmpty())

    {

        int index = portList.indexOfName(portName);

class PortControl : public QWidget

{

    Q_OBJECT

public:

    explicit PortControl(QSerialPort* port, QWidget* parent = 0);

    ~PortControl();

    QSerialPort* serialPort;

    QToolBar* toolBar();

    void selectPort(QString portName);

    void selectBaudrate(QString baudRate);

    void openPort();

    /// Stores port settings into a `QSettings`

    void saveSettings(QSettings* settings);

    /// Loads port settings from a `QSettings`. If open serial port is closed.

    void loadSettings(QSettings* settings);

private:

    Ui::PortControl *ui;

    QButtonGroup parityButtons;

    QButtonGroup dataBitsButtons;

    QButtonGroup stopBitsButtons;

    QButtonGroup flowControlButtons;

    QToolBar portToolBar;

    QAction openAction;

    QAction loadPortListAction;

    QComboBox tbPortList;

    PortList portList;

    /// Used to refresh pinout signal leds periodically

    QTimer pinUpdateTimer;

    /// Returns the currently selected (entered) "portName" in the UI

    QString selectedPortName();

    /// Returns currently selected parity as text to be saved in settings

    QString currentParityText();

    /// Returns currently selected flow control as text to be saved in settings

    QString currentFlowControlText();

private slots:

    void loadPortList();

    void loadBaudRateList();

    void togglePort();

    void _selectBaudRate(QString baudRate);

    void selectParity(int parity); // parity must be one of QSerialPort::Parity

    void selectDataBits(int dataBits); // bits must be one of QSerialPort::DataBits

    void selectStopBits(int stopBits); // stopBits must be one of QSerialPort::StopBits

    void selectFlowControl(int flowControl); // flowControl must be one of QSerialPort::FlowControl

    void openActionTriggered(bool checked);

    void onCbPortListActivated(int index);

    void onTbPortListActivated(int index);

    void onPortError(QSerialPort::SerialPortError error);

    void updatePinLeds(void);

signals:

    void portToggled(bool open);

};

#endif // PORTCONTROL_H