cmake_minimum_required(VERSION 2.8.11)

project(serialplot)

# Find includes in corresponding build directories

set(CMAKE_INCLUDE_CURRENT_DIR ON)

# Instruct CMake to run moc automatically when needed.

set(CMAKE_AUTOMOC ON)

# add local path for cmake modules

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/modules/")

# Find the QtWidgets library

find_package(Qt5Widgets)

find_package(Qwt 6.1 REQUIRED)

# includes

include_directories(${QWT_INCLUDE_DIR})

# wrap UI files

qt5_wrap_ui(UI_FILES mainwindow.ui)

# Tell CMake to create the helloworld executable

add_executable(serialplot main.cpp mainwindow.cpp customcheckablebutton.cpp ${UI_FILES})

# Use the Widgets module from Qt 5.

qt5_use_modules(serialplot Widgets SerialPort)

target_link_libraries(serialplot ${QWT_LIBRARY})

# Enable C++11 support, fail if not supported

include(CheckCXXCompilerFlag)

CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)

CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)

if(COMPILER_SUPPORTS_CXX11)

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

elseif(COMPILER_SUPPORTS_CXX0X)

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")

else()

  message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")

endif()

# add make run target

add_custom_target(run

    COMMAND serialplot

    DEPENDS serialplot

    WORKING_DIRECTORY ${CMAKE_PROJECT_DIR}

)

Small and simple software for plotting data from serial port.

# Dependencies

- Qt 5, including serialport module

- qwt 6.1

- libudev-dev (required for QSerialPort)

# Qt Widgets for Technical Applications

# available at http://www.http://qwt.sourceforge.net/

#

# The module defines the following variables:

#  QWT_FOUND - the system has Qwt

#  QWT_INCLUDE_DIR - where to find qwt_plot.h

#  QWT_INCLUDE_DIRS - qwt includes

#  QWT_LIBRARY - where to find the Qwt library

#  QWT_LIBRARIES - aditional libraries

#  QWT_MAJOR_VERSION - major version

#  QWT_MINOR_VERSION - minor version

#  QWT_PATCH_VERSION - patch version

#  QWT_VERSION_STRING - version (ex. 5.2.1)

#  QWT_ROOT_DIR - root dir (ex. /usr/local)

#=============================================================================

# Copyright 2010-2013, Julien Schueller

# All rights reserved.

# 

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met: 

# 

# 1. Redistributions of source code must retain the above copyright notice, this

#    list of conditions and the following disclaimer. 

# 2. 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. 

#

# 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.

# The views and conclusions contained in the software and documentation are those

# of the authors and should not be interpreted as representing official policies, 

# either expressed or implied, of the FreeBSD Project.

#=============================================================================

# TODO: handle multiple versions of qwt

file(GLOB QWT_GLOB_DIR "/usr/local/qwt*/")

find_path ( QWT_INCLUDE_DIR

  NAMES qwt_plot.h

  HINTS ${QT_INCLUDE_DIR} "${QWT_GLOB_DIR}/include"

  PATH_SUFFIXES qwt qwt-qt3 qwt-qt4 qwt-qt5

)

set ( QWT_INCLUDE_DIRS ${QWT_INCLUDE_DIR} )

# version

set ( _VERSION_FILE ${QWT_INCLUDE_DIR}/qwt_global.h )

if ( EXISTS ${_VERSION_FILE} )

  file ( STRINGS ${_VERSION_FILE} _VERSION_LINE REGEX "define[ ]+QWT_VERSION_STR" )

  if ( _VERSION_LINE )

    string ( REGEX REPLACE ".*define[ ]+QWT_VERSION_STR[ ]+\"(.*)\".*" "\\1" QWT_VERSION_STRING "${_VERSION_LINE}" )

    string ( REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\1" QWT_MAJOR_VERSION "${QWT_VERSION_STRING}" )

    string ( REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\2" QWT_MINOR_VERSION "${QWT_VERSION_STRING}" )

    string ( REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\3" QWT_PATCH_VERSION "${QWT_VERSION_STRING}" )

  endif ()

endif ()

# check version

set ( _QWT_VERSION_MATCH TRUE )

if ( Qwt_FIND_VERSION AND QWT_VERSION_STRING )

  if ( Qwt_FIND_VERSION_EXACT )

    if ( NOT Qwt_FIND_VERSION VERSION_EQUAL QWT_VERSION_STRING )

      set ( _QWT_VERSION_MATCH FALSE )

    endif ()

  else ()

    if ( QWT_VERSION_STRING VERSION_LESS Qwt_FIND_VERSION )

      set ( _QWT_VERSION_MATCH FALSE )

    endif ()

  endif ()

endif ()

find_library ( QWT_LIBRARY

  NAMES qwt qwt-qt3 qwt-qt4 qwt-qt5

  HINTS ${QT_LIBRARY_DIR} "${QWT_GLOB_DIR}/lib"

)

set ( QWT_LIBRARIES ${QWT_LIBRARY} )

# try to guess root dir from include dir

if ( QWT_INCLUDE_DIR )

  string ( REGEX REPLACE "(.*)/include.*" "\\1" QWT_ROOT_DIR ${QWT_INCLUDE_DIR} )

# try to guess root dir from library dir

elseif ( QWT_LIBRARY )

  string ( REGEX REPLACE "(.*)/lib[/|32|64].*" "\\1" QWT_ROOT_DIR ${QWT_LIBRARY} )

endif ()

# handle the QUIETLY and REQUIRED arguments

include ( FindPackageHandleStandardArgs )

if ( CMAKE_VERSION LESS 2.8.3 )

  find_package_handle_standard_args( Qwt DEFAULT_MSG QWT_LIBRARY QWT_INCLUDE_DIR _QWT_VERSION_MATCH )

else ()

  find_package_handle_standard_args( Qwt REQUIRED_VARS QWT_LIBRARY QWT_INCLUDE_DIR _QWT_VERSION_MATCH VERSION_VAR QWT_VERSION_STRING )

endif ()

mark_as_advanced (

  QWT_LIBRARY 

  QWT_LIBRARIES

  QWT_INCLUDE_DIR

  QWT_INCLUDE_DIRS

  QWT_MAJOR_VERSION

  QWT_MINOR_VERSION

  QWT_PATCH_VERSION

  QWT_VERSION_STRING

  QWT_ROOT_DIR

)

#include "customcheckablebutton.h"

CustomCheckableButton::CustomCheckableButton(QWidget *parent) :

    QPushButton(parent)

{

    this->setCheckable(true);

}

void CustomCheckableButton::nextCheckState()

{

    /* Do nothing! Check state will be altered by parent. */

}

#ifndef CUSTOMCHECKABLEBUTTON_H

#define CUSTOMCHECKABLEBUTTON_H

#include <QPushButton>

class CustomCheckableButton : public QPushButton

{

    Q_OBJECT

public:

    explicit CustomCheckableButton(QWidget *parent = 0);

signals:

public slots:

private:

    void nextCheckState();

};

#endif // CUSTOMCHECKABLEBUTTON_H

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    MainWindow w;

    w.show();

    return a.exec();

}

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QSerialPortInfo>

#include <QtDebug>

#include "utils.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    // init UI signals

    QObject::connect(ui->pbReloadPorts, &QPushButton::clicked,

                     this, &MainWindow::loadPortList);

    QObject::connect(ui->pbOpenPort, &QPushButton::clicked,

                     this, &MainWindow::togglePort);

    QObject::connect(this, &MainWindow::portToggled,

                     this, &MainWindow::onPortToggled);

    QObject::connect(ui->cbPortList,

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

                     this, &MainWindow::selectPort);

    QObject::connect(ui->cbBaudRate,

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

                     this, &MainWindow::selectBaudRate);

    QObject::connect(&(this->serialPort), &QSerialPort::readyRead,

                     this, &MainWindow::onDataReady);

    loadPortList();

    loadBaudRateList();

    ui->cbBaudRate->setCurrentIndex(ui->cbBaudRate->findText("9600"));

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::loadPortList()

{

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

    ui->cbPortList->clear();

    for (auto port : QSerialPortInfo::availablePorts())

    {

        ui->cbPortList->addItem(port.portName());

    }

    // find current selection in the new list, maybe it doesn't exist anymore?

    int currentSelectionIndex = ui->cbPortList->findText(currentSelection);

    if (currentSelectionIndex >= 0)

    {

        ui->cbPortList->setCurrentIndex(currentSelectionIndex);

    }

    else // our port doesn't exist anymore, close port if it's open

    {

        if (serialPort.isOpen()) togglePort();

    }

}

void MainWindow::loadBaudRateList()

{

    ui->cbBaudRate->clear();

    for (auto baudRate : QSerialPortInfo::standardBaudRates())

    {

        ui->cbBaudRate->addItem(QString::number(baudRate));

    }

}

void MainWindow::togglePort()

{

    if (serialPort.isOpen())

    {

        serialPort.close();

        qDebug() << "Port closed, " << serialPort.portName();

        emit portToggled(false);

    }

    else

    {

        serialPort.setPortName(ui->cbPortList->currentText());

        // open port

        if (serialPort.open(QIODevice::ReadWrite))

        {

            qDebug() << "Port opened, " << serialPort.portName();

            emit portToggled(true);

            // set baud rate

            if (!serialPort.setBaudRate(ui->cbBaudRate->currentText().toInt()))

            {

                qDebug() << "Set baud rate failed during port opening: "

                         << serialPort.error();

            }

        }

        else

        {

            qDebug() << "Port open error: " << serialPort.error();

        }

    }

}

void MainWindow::selectPort(QString portName)

{

    // 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();

        }

    }

}

void MainWindow::selectBaudRate(QString baudRate)

{

    if (serialPort.isOpen())

    {

        if (!serialPort.setBaudRate(baudRate.toInt()))

        {

            qDebug() << "Set baud rate failed during select: "

                     << serialPort.error();

        }

        else

        {

            qDebug() << "Baud rate changed: " << serialPort.baudRate();

        }

    }

}

void MainWindow::onPortToggled(bool open)

{

    ui->pbOpenPort->setChecked(open);

}

void MainWindow::onDataReady()

{

    qDebug() << "Data: " << serialPort.readAll().toHex();

}

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QString>

#include <QSerialPort>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private:

    Ui::MainWindow *ui;

    QSerialPort serialPort;

private slots:

    void loadPortList();

    void loadBaudRateList();

    void togglePort();

    void selectPort(QString portName);

    void onPortToggled(bool open);

    void selectBaudRate(QString baudRate);

    void onDataReady();

signals:

    void portToggled(bool open);

};

#endif // MAINWINDOW_H

<?xml version="1.0" encoding="UTF-8"?>

<ui version="4.0">

 <class>MainWindow</class>

 <widget class="QMainWindow" name="MainWindow">

  <property name="geometry">

   <rect>

    <x>0</x>

    <y>0</y>

    <width>652</width>

    <height>534</height>

   </rect>

  </property>

  <property name="windowTitle">

   <string>MainWindow</string>

  </property>

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

   <layout class="QVBoxLayout" name="verticalLayout_2">

    <item>

     <widget class="QwtPlot" name="plot" native="true">

      <property name="sizePolicy">

       <sizepolicy hsizetype="Preferred" vsizetype="MinimumExpanding">

        <horstretch>0</horstretch>

        <verstretch>0</verstretch>

       </sizepolicy>

      </property>

     </widget>

    </item>

    <item>

     <widget class="QTabWidget" name="tabWidget">

      <property name="sizePolicy">

       <sizepolicy hsizetype="Expanding" vsizetype="Minimum">

        <horstretch>0</horstretch>

        <verstretch>0</verstretch>

       </sizepolicy>

      </property>

      <property name="minimumSize">

       <size>

        <width>0</width>

        <height>0</height>

       </size>

      </property>

      <property name="maximumSize">

       <size>

        <width>16777215</width>

        <height>16777215</height>

       </size>

      </property>

      <property name="currentIndex">

       <number>0</number>

      </property>

      <property name="movable">

       <bool>false</bool>

      </property>

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

       <attribute name="title">

        <string>Port</string>

       </attribute>

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

        <item>

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

          <item>

           <layout class="QGridLayout" name="gridLayout">

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

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

              <property name="text">

               <string>Port:</string>

              </property>

             </widget>

            </item>

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

             <widget class="QComboBox" name="cbPortList">

              <property name="sizePolicy">

               <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">

                <horstretch>0</horstretch>

                <verstretch>0</verstretch>

               </sizepolicy>

              </property>

             </widget>

            </item>

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

             <widget class="QComboBox" name="cbBaudRate">

              <property name="inputMethodHints">

               <set>Qt::ImhPreferNumbers</set>

              </property>

              <property name="editable">

               <bool>true</bool>

              </property>

             </widget>

            </item>

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

             <widget class="QLabel" name="label_2">

              <property name="text">

               <string>Baud Rate:</string>

              </property>

             </widget>

            </item>

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

             <widget class="QPushButton" name="pbReloadPorts">

              <property name="sizePolicy">

               <sizepolicy hsizetype="Minimum" vsizetype="Fixed">

                <horstretch>0</horstretch>

                <verstretch>0</verstretch>

               </sizepolicy>

              </property>

              <property name="maximumSize">

               <size>

                <width>30</width>

                <height>16777215</height>

               </size>

              </property>

              <property name="text">

               <string>🔄</string>

              </property>

             </widget>

            </item>

           </layout>

          </item>

          <item>

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

            <item>

             <widget class="QFrame" name="frame">

              <property name="frameShape">

               <enum>QFrame::NoFrame</enum>

              </property>

              <layout class="QVBoxLayout" name="verticalLayout_5">

               <item>

                <widget class="QRadioButton" name="rbNoParity">

                 <property name="text">

                  <string>No Parity</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rbOddParity">

                 <property name="text">

                  <string>Odd Parity</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rbEvenParity">

                 <property name="text">

                  <string>Even Parity</string>

                 </property>

                </widget>

               </item>

               <item>

                <spacer name="verticalSpacer_2">

                 <property name="orientation">

                  <enum>Qt::Vertical</enum>

                 </property>

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

                  <size>

                   <width>20</width>

                   <height>2</height>

                  </size>

                 </property>

                </spacer>

               </item>

              </layout>

             </widget>

            </item>

            <item>

             <widget class="QFrame" name="frame_3">

              <layout class="QVBoxLayout" name="verticalLayout_7">

               <item>

                <widget class="QRadioButton" name="rb8Bits">

                 <property name="text">

                  <string>8 bits</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rb7Bits">

                 <property name="text">

                  <string>7 bits</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rb6Bits">

                 <property name="text">

                  <string>6 bits</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rb5Bits">

                 <property name="text">

                  <string>5 bits</string>

                 </property>

                </widget>

               </item>

              </layout>

             </widget>

            </item>

            <item>

             <widget class="QFrame" name="frame_4">

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

               <item>

                <widget class="QRadioButton" name="rb1StopBit">

                 <property name="text">

                  <string>1 Stop Bit</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rb2StopBit">

                 <property name="text">

                  <string>2 Stop Bit</string>

                 </property>

                </widget>

               </item>

               <item>

                <spacer name="verticalSpacer_4">

                 <property name="orientation">

                  <enum>Qt::Vertical</enum>

                 </property>

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

                  <size>

                   <width>20</width>

                   <height>2</height>

                  </size>

                 </property>

                </spacer>

               </item>

              </layout>

             </widget>

            </item>

            <item>

             <widget class="QFrame" name="frame_2">

              <layout class="QVBoxLayout" name="verticalLayout_6">

               <item>

                <widget class="QRadioButton" name="rbNoFlowControl">

                 <property name="text">

                  <string>No Flow Control</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rbHardwareControl">

                 <property name="text">

                  <string>Hardware Control</string>

                 </property>

                </widget>

               </item>

               <item>

                <widget class="QRadioButton" name="rbSoftwareControl">

                 <property name="text">

                  <string>Software Control</string>

                 </property>

                </widget>

               </item>

               <item>

                <spacer name="verticalSpacer_5">

                 <property name="orientation">

                  <enum>Qt::Vertical</enum>

                 </property>

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

                  <size>

                   <width>20</width>

                   <height>2</height>

                  </size>

                 </property>

                </spacer>

               </item>

              </layout>

             </widget>

            </item>

           </layout>

          </item>

         </layout>

        </item>

        <item>

         <spacer name="horizontalSpacer">

          <property name="orientation">

           <enum>Qt::Horizontal</enum>

          </property>

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

           <size>

            <width>10000</width>

            <height>20</height>

           </size>

          </property>

         </spacer>

        </item>

        <item>

         <layout class="QVBoxLayout" name="verticalLayout_4">

          <item>

           <widget class="CustomCheckableButton" name="pbOpenPort">

            <property name="minimumSize">

             <size>

              <width>0</width>

              <height>50</height>

             </size>

            </property>

            <property name="text">

             <string>Open</string>

            </property>

            <property name="checkable">

             <bool>true</bool>

            </property>

           </widget>

          </item>

          <item>

           <widget class="QPushButton" name="pbSkipByte">

            <property name="text">

             <string>Skip Byte</string>

            </property>

           </widget>

          </item>

          <item>

           <spacer name="verticalSpacer">

            <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>

       </layout>

      </widget>

      <widget class="QWidget" name="tab_2">

       <attribute name="title">

        <string>Tab 2</string>

       </attribute>

      </widget>

     </widget>

    </item>

   </layout>

  </widget>

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

   <property name="geometry">

    <rect>

     <x>0</x>

     <y>0</y>

     <width>652</width>

     <height>20</height>

    </rect>

   </property>

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

    <property name="title">

     <string>File</string>

    </property>

    <addaction name="actionFileLoadProfile"/>

    <addaction name="actionFileSaveProfile"/>

   </widget>

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

    <property name="title">

     <string>Help</string>

    </property>

    <addaction name="actionHelpDataFormats"/>

    <addaction name="actionHelpAbout"/>

   </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="actionStart"/>

   <addaction name="actionClear"/>

  </widget>

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

  <action name="actionStart">

   <property name="checkable">

    <bool>true</bool>

   </property>

   <property name="text">

    <string>Start</string>

   </property>

  </action>

  <action name="actionClear">

   <property name="text">

    <string>Clear</string>

   </property>

  </action>

  <action name="actionHelpDataFormats">

   <property name="text">

    <string>Data Formats</string>

   </property>

  </action>

  <action name="actionHelpAbout">

   <property name="text">

    <string>About</string>

   </property>

  </action>

  <action name="actionFileLoadProfile">

   <property name="text">

    <string>Load Profile</string>

   </property>

  </action>

  <action name="actionFileSaveProfile">

   <property name="text">

    <string>Save Profile</string>

   </property>

  </action>

 </widget>

 <layoutdefault spacing="6" margin="11"/>

 <customwidgets>

  <customwidget>

   <class>QwtPlot</class>

   <extends>QWidget</extends>

   <header>qwt_plot.h</header>

   <container>1</container>

  </customwidget>

  <customwidget>

   <class>CustomCheckableButton</class>

   <extends>QPushButton</extends>

   <header>customcheckablebutton.h</header>

  </customwidget>

 </customwidgets>

 <resources/>

 <connections/>

</ui>

#-------------------------------------------------