// init UI signals

    // menu signals

    QObject::connect(ui->actionHelpAbout, &QAction::triggered,

              &aboutDialog, &QWidget::show);

    QObject::connect(ui->actionExportCsv, &QAction::triggered,

                     this, &MainWindow::onExportCsv);

    QObject::connect(&portControl, &PortControl::portToggled,

                     this, &MainWindow::onPortToggled);

    QObject::connect(&portControl, &PortControl::skipByteRequested,

                     this, &MainWindow::skipByte);

    QObject::connect(ui->spNumOfSamples, SELECT<int>::OVERLOAD_OF(&QSpinBox::valueChanged),

                     this, &MainWindow::onNumOfSamplesChanged);

    QObject::connect(ui->cbAutoScale, &QCheckBox::toggled,

                     this, &MainWindow::onAutoScaleChecked);

    QObject::connect(ui->spYmin, SIGNAL(valueChanged(double)),

                     this, SLOT(onYScaleChanged()));

    QObject::connect(ui->spYmax, SIGNAL(valueChanged(double)),

                     this, SLOT(onYScaleChanged()));

    QObject::connect(ui->actionClear, SIGNAL(triggered(bool)),

                     this, SLOT(clearPlot()));

    // setup number of channels spinbox

    QObject::connect(ui->spNumOfChannels,

                     SELECT<int>::OVERLOAD_OF(&QSpinBox::valueChanged),

                     this, &MainWindow::onNumOfChannelsChanged);

    // setup number format buttons

    numberFormatButtons.addButton(ui->rbUint8,  NumberFormat_uint8);

    numberFormatButtons.addButton(ui->rbUint16, NumberFormat_uint16);

    numberFormatButtons.addButton(ui->rbUint32, NumberFormat_uint32);

    numberFormatButtons.addButton(ui->rbInt8,   NumberFormat_int8);

    numberFormatButtons.addButton(ui->rbInt16,  NumberFormat_int16);

    numberFormatButtons.addButton(ui->rbInt32,  NumberFormat_int32);

    numberFormatButtons.addButton(ui->rbFloat,  NumberFormat_float);

    numberFormatButtons.addButton(ui->rbASCII,  NumberFormat_ASCII);

    QObject::connect(&numberFormatButtons, SIGNAL(buttonToggled(int, bool)),

                     this, SLOT(onNumberFormatButtonToggled(int, bool)));

    // init port signals

    QObject::connect(&(this->serialPort), SIGNAL(error(QSerialPort::SerialPortError)),

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

    // set limits for axis limit boxes

    ui->spYmin->setRange((-1) * std::numeric_limits<double>::max(),

                         std::numeric_limits<double>::max());

    ui->spYmax->setRange((-1) * std::numeric_limits<double>::max(),

                         std::numeric_limits<double>::max());

    // init data arrays and plot

    numOfSamples = ui->spNumOfSamples->value();

    numOfChannels = 1;

    dataX.resize(numOfSamples);

    for (int i = 0; i < dataX.size(); i++)

    {

        dataX[i] = i;

    }

    // init channel data and curve list

    for (unsigned int i = 0; i < numOfChannels; i++)

    {

        channelsData.append(DataArray(numOfSamples, 0.0));

        curves.append(new QwtPlotCurve());

        curves[i]->setSamples(dataX, channelsData[i]);

        curves[i]->setPen(makeColor(i));

        curves[i]->attach(ui->plot);

    }

    // init number format

    if (numberFormatButtons.checkedId() >= 0)

    {

        selectNumberFormat((NumberFormat) numberFormatButtons.checkedId());

    }

    else

    {

        selectNumberFormat(NumberFormat_uint8);

    }

    // init text view

    ui->ptTextView->setEnabled(ui->cbEnableTextView->isChecked());

    // TODO: does this work in binary mode? (no new lines)

    ui->ptTextView->setMaximumBlockCount(10000);

    QObject::connect(ui->cbEnableTextView, &QCheckBox::toggled,

                     ui->ptTextView, &QWidget::setEnabled);

    // Init demo mode

    demoCount = 0;

    demoTimer.setInterval(100);

    QObject::connect(&demoTimer, &QTimer::timeout,

                     this, &MainWindow::demoTimerTimeout);

    QObject::connect(ui->actionDemoMode, &QAction::toggled,

                     this, &MainWindow::enableDemo);

}

MainWindow::~MainWindow()

{

    for (auto curve : curves)

    {

        delete curve;

    }

    if (serialPort.isOpen())

    {

        serialPort.close();

    }

    delete ui;

}

void MainWindow::setupAboutDialog()

{

    Ui_AboutDialog uiAboutDialog;

    uiAboutDialog.setupUi(&aboutDialog);

    QObject::connect(uiAboutDialog.pbAboutQt, &QPushButton::clicked,

                     [](){ QApplication::aboutQt();});

    QString aboutText = uiAboutDialog.lbAbout->text();

    aboutText.replace("$VERSION_STRING$", VERSION_STRING);

    aboutText.replace("$VERSION_REVISION$", VERSION_REVISION);

    uiAboutDialog.lbAbout->setText(aboutText);

}

void MainWindow::onPortToggled(bool open)

{

    // make sure demo mode is disabled

    if (open && isDemoRunning()) enableDemo(false);

    ui->actionDemoMode->setEnabled(!open);

}

void MainWindow::onDataReady()

{

    if (!ui->actionPause->isChecked())

    {

        // a package is a set of channel data like {CHAN0_SAMPLE, CHAN1_SAMPLE...}

        int packageSize = sampleSize * numOfChannels;

        int bytesAvailable = serialPort.bytesAvailable();

        if (bytesAvailable > 0 && skipByteRequested)

        {

            serialPort.read(1);

            skipByteRequested = false;

            bytesAvailable--;

        }

        if (bytesAvailable < packageSize)

        {

            return;

        }

        else

        {

            int numOfPackagesToRead =

                (bytesAvailable - (bytesAvailable % packageSize)) / packageSize;

            QVector<DataArray> channelSamples(numOfChannels);

            for (unsigned int ci = 0; ci < numOfChannels; ci++)

            {

                channelSamples[ci].resize(numOfPackagesToRead);

            }

            int i = 0;

            while(i < numOfPackagesToRead)

            {

                for (unsigned int ci = 0; ci < numOfChannels; ci++)

                {

                    channelSamples[ci].replace(i, (this->*readSample)());

                }

                i++;

            }

            for (unsigned int ci = 0; ci < numOfChannels; ci++)

            {

                addChannelData(ci, channelSamples[ci]);

            }

        }

    }

    else

    {

        serialPort.clear(QSerialPort::Input);

    }

}

             <string>Number Of Samples:</string>

            </property>

           </widget>

          </item>

          <item row="1" column="0">

           <widget class="QCheckBox" name="cbAutoScale">

            <property name="text">

             <string>Auto Scale Y Axis</string>

            </property>

            <property name="checked">

             <bool>true</bool>

            </property>

           </widget>

          </item>

          <item row="3" column="0">

           <widget class="QLabel" name="lYmin">

            <property name="enabled">

             <bool>false</bool>

            </property>

            <property name="text">

             <string>Ymin</string>

            </property>

           </widget>

          </item>

          <item row="2" column="0">

           <widget class="QLabel" name="lYmax">

            <property name="enabled">

             <bool>false</bool>

            </property>

            <property name="text">

             <string>Ymax</string>

            </property>

           </widget>

          </item>

          <item row="2" column="1">

           <widget class="QDoubleSpinBox" name="spYmax">

            <property name="enabled">

             <bool>false</bool>

            </property>

            <property name="maximumSize">

             <size>

              <width>75</width>

              <height>16777215</height>

             </size>

            </property>

            <property name="maximum">

             <double>1000.000000000000000</double>

            </property>

            <property name="value">

             <double>1000.000000000000000</double>

            </property>

           </widget>

          </item>

         </layout>

        </item>

       </layout>

      </widget>

      <widget class="QWidget" name="tabTextView">

       <attribute name="title">

        <string>Text View</string>

       </attribute>

       <layout class="QHBoxLayout" name="horizontalLayout_2">

        <property name="leftMargin">

         <number>4</number>

        </property>

        <property name="topMargin">

         <number>4</number>

        </property>

        <property name="rightMargin">

         <number>4</number>

        </property>

        <property name="bottomMargin">

         <number>4</number>

        </property>

        <item>

         <layout class="QVBoxLayout" name="verticalLayout_3">

          <item>

           <widget class="QCheckBox" name="cbEnableTextView">

            <property name="text">

             <string>Enable</string>

            </property>

           </widget>

          </item>

          <item>

           <spacer name="verticalSpacer_3">

            <property name="orientation">

             <enum>Qt::Vertical</enum>

            </property>

            <property name="sizeHint" stdset="0">

             <size>

              <width>20</width>

              <height>40</height>

             </size>

            </property>

           </spacer>

          </item>

         </layout>

        </item>

        <item>

         <widget class="QPlainTextEdit" name="ptTextView">

          <property name="font">

           <font>

            <family>Monospace</family>

           </font>

          </property>

          <property name="readOnly">

           <bool>true</bool>

          </property>

         </widget>

        </item>

       </layout>

      </widget>

      <widget class="QWidget" name="tabLog">

       <attribute name="title">

        <string>Log</string>

       </attribute>

       <attribute name="toolTip">

        <string>Error and Warning Messages</string>

       </attribute>

       <layout class="QHBoxLayout" name="horizontalLayout">

        <property name="leftMargin">

         <number>4</number>

        </property>

        <property name="topMargin">

         <number>4</number>

        </property>

        <property name="rightMargin">

         <number>4</number>

        </property>

        <property name="bottomMargin">

         <number>4</number>

        </property>

        <item>

         <widget class="QPlainTextEdit" name="ptLog">

          <property name="readOnly">

           <bool>true</bool>

          </property>

         </widget>

        </item>

       </layout>

      </widget>

     </widget>

    </item>

   </layout>

  </widget>

  <widget class="QMenuBar" name="menuBar">

   <property name="geometry">

    <rect>

     <x>0</x>

     <y>0</y>

     <width>653</width>

     <height>23</height>

    </rect>

   </property>

   <widget class="QMenu" name="menuHelp">

    <property name="title">

     <string>Help</string>

    </property>

    <addaction name="actionDemoMode"/>

    <addaction name="actionHelpAbout"/>

   </widget>

   <widget class="QMenu" name="menuFile">

    <property name="title">

     <string>File</string>

    </property>

    <addaction name="actionExportCsv"/>

   </widget>

   <addaction name="menuFile"/>

   <addaction name="menuHelp"/>

  </widget>

  <widget class="QToolBar" name="mainToolBar">

   <attribute name="toolBarArea">

    <enum>TopToolBarArea</enum>

   </attribute>

   <attribute name="toolBarBreak">

    <bool>false</bool>

   </attribute>

   <addaction name="actionPause"/>

   <addaction name="actionClear"/>

  </widget>

  <widget class="QStatusBar" name="statusBar"/>

  <action name="actionPause">

   <property name="checkable">

    <bool>true</bool>

   </property>

   <property name="checked">

    <bool>false</bool>

   </property>

   <property name="text">

    <string>Pause</string>

   </property>

   <property name="toolTip">