How to Develop Qt ProgramSimple Examples (5)

2011. 2 . 2Mr. Kwon

• I2C Control EEPROM

• Serial Communication Simple Serial Communication Program

GPS Receiver

• UDP Socket Timer Server/Client

• Mp3 Player

Contents

Simple Qt Example for MINI6410

I2C -EEPROM

I2C-EEPROM

Create New Project (Abstract)

Qt4 Application Type Projects >> Qt4 Gui Application

Project Name I2C

Project Location /nfs

Class Name MyWidget

Base Class QWidget

Window Size (LCD) 420 X 240 (Width-Height)

•Create New Project

Design UI

Window Size : 420 X 240 Design the form below with: - QLabel - QPushButton - QTextEdit

QLabel

PushButton

TextEdit

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class (Details)

#-------------------------------------------------## Project created by QtCreator 2011-02-08T10:49:57##-------------------------------------------------

TARGET = I2CTEMPLATE = app

SOURCES += main.cpp\ mywidget.cpp

HEADERS += mywidget.h

FORMS += mywidget.ui

I2C.pro

Implementing the MyWidget Class (Details)

mywidget.h#ifndef MYWIDGET_H#define MYWIDGET_H

#include <QWidget>#include <QMessageBox>#include <QFileDialog>

#include <unistd.h>#include <stdlib.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/ioctl.h>#include <fcntl.h>#include <getopt.h>#include <errno.h>#include <string.h>

namespace Ui { class MyWidget;}

class MyWidget : public QWidget { Q_OBJECTpublic: MyWidget(QWidget *parent = 0); ~MyWidget();

protected: void changeEvent(QEvent *e);

private: Ui::MyWidget *ui; int m_fd; int fd; int value;

private slots: void on_close_clicked(); void on_read_clicked(); void on_write_clicked(); void update();};#endif // MYWIDGET_H

Implementing the MyWidget Class (Details)

main.cpp

#include <QtGui/QApplication>#include "mywidget.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); MyWidget w; w.show(); return a.exec();}

Implementing the MyWidget Class (Details)

mywidget.cpp (1/4)

#include "mywidget.h"#include "ui_mywidget.h"

MyWidget::MyWidget(QWidget *parent) : QWidget(parent), ui(new Ui::MyWidget){ ui->setupUi(this); value=0;

setWindowTitle("I2C EEPROM on MINI6410");

m_fd = ::open("/dev/i2c/0",O_RDONLY); if(m_fd<0){ QMessageBox::information(this, "ERROR","Fail to open /dev/I2C"); return; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (2/4)

MyWidget::~MyWidget(){ delete ui; ::close(m_fd);}

void MyWidget::changeEvent(QEvent *e){ QWidget::changeEvent(e); switch (e->type()) { case QEvent::LanguageChange: ui->retranslateUi(this); break; default: break; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (3/4)

void MyWidget::on_write_clicked(){ ::system("i2c -w >> temp.txt");

ui->textEdit->clear(); QFile file("temp.txt"); if(file.open((QFile::ReadOnly | QFile::Text))) { ui->textEdit->setPlainText(file.readAll()); } file.remove("temp.txt");

}

Implementing the MyWidget Class (Details)

mywidget.cpp (4/4)

void MyWidget::on_read_clicked(){ ::system("i2c -r >> temp.txt");

ui->textEdit->clear(); QFile file("temp.txt"); if(file.open((QFile::ReadOnly | QFile::Text))) { ui->textEdit->setPlainText(file.readAll()); } file.remove("temp.txt");}

void MyWidget::on_close_clicked(){ close();}

Run on Host PC

Run on MINI 6410

Simple Qt Example for MINI6410

Serial Communication

Serial Communication

Create New Project (Abstract)

Qt4 Application Type Projects >> Qt4 Gui Application

Project Name SerialCom

Project Location /nfs

Class Name MyWidget

Base Class QWidget

Window Size (LCD) 420 X 240 (Width-Height)

•Create New Project

Design UI

Window Size : 420 X 240 Design the form below with: - QLabel - QPushButton - QTextEdit

QLabel

PushButton

TextEdit

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class (Details)

#-------------------------------------------------## Project created by QtCreator 2011-02-04T19:08:46##-------------------------------------------------

TARGET = SerialComTEMPLATE = app

SOURCES += main.cpp\ mywidget.cpp

HEADERS += mywidget.h

FORMS += mywidget.ui

SerialCom.pro

Implementing the MyWidget Class (Details)

mywidget.h#ifndef MYWIDGET_H#define MYWIDGET_H

#include <QWidget>#include <QSocketNotifier>#include <QTimer>#include <QMessageBox>#include <QStringList>

#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/ioctl.h>#include <fcntl.h>#include <linux/fs.h>#include <errno.h>#include <string.h>#include <termio.h>

namespace Ui { class MyWidget;}

class MyWidget : public QWidget { Q_OBJECTpublic: MyWidget(QWidget *parent = 0); ~MyWidget();

protected: void changeEvent(QEvent *e);

private: Ui::MyWidget *ui;

int m_fd; QSocketNotifier *m_notifier; int openSerialPort();

Implementing the MyWidget Class (Details)

mywidget.hprivate slots: void on_send_clicked(); void remoteDataIncoming();};

#endif // MYWIDGET_H

Implementing the MyWidget Class (Details)

main.cpp

#include <QtGui/QApplication>#include "mywidget.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); MyWidget w; w.show(); return a.exec();}

Implementing the MyWidget Class (Details)

mywidget.cpp (1/5)

#include "mywidget.h"#include "ui_mywidget.h"

MyWidget::MyWidget(QWidget *parent) : QWidget(parent), ui(new Ui::MyWidget){ ui->setupUi(this); m_fd = openSerialPort(); if(m_fd<0){ QMessageBox::warning(this, tr("Error"), tr("Fail to Open Serial Port!")); return; } m_notifier = new QSocketNotifier(m_fd, QSocketNotifier::Read, this); connect(m_notifier, SIGNAL(activated(int)), this, SLOT(remoteDataIncoming())); setWindowTitle("Serial Communication");}

Implementing the MyWidget Class (Details)

mywidget.cpp (2/5)

MyWidget::~MyWidget(){ delete ui;

if(m_notifier){ delete m_notifier; m_notifier=0; }

if(m_fd>=0){ ::close(m_fd); m_fd=-1; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (3/5)

void MyWidget::changeEvent(QEvent *e){ QWidget::changeEvent(e); switch (e->type()) { case QEvent::LanguageChange: ui->retranslateUi(this); break; default: break; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (4/5)

void MyWidget::on_send_clicked(){ QString text(ui->send_text->toPlainText()); if(text.isEmpty()){ return; } ::write(m_fd, text.toLatin1(), text.length()); ui->send_text->clear();}void MyWidget::remoteDataIncoming(){ char c; if(read(m_fd, &c, sizeof c) != 1){ QMessageBox::warning(this, tr("Error"), tr("Receive Error")); return; } ui->recv_text->insertPlainText(QString(char(c)));}

Implementing the MyWidget Class (Details)

mywidget.cpp (5/5)

int MyWidget::openSerialPort(){ int fd=-1; const char *devName="/dev/ttySAC0"; fd = ::open(devName, O_RDWR | O_NONBLOCK); if(fd<0){ return -1; } termios serialAttr; memset(&serialAttr, 0, sizeof serialAttr); serialAttr.c_iflag = IGNPAR; serialAttr.c_cflag = B9600 | HUPCL | CS8 | CREAD | CLOCAL; serialAttr.c_cc[VMIN] = 1; if(tcsetattr(fd, TCSANOW, &serialAttr) != 0){ return -1; } return fd;}

Run on Host PC

Run on MINI 6410

Simple Qt Example for MINI6410

GPS Receiver

GPS Receiver

GPS

GPS Module (UIGGUB01-R003) -Integrated Antena-Serial Interface- High Speed Acquisition (10Hz)- Small Size, Efficient Power Man-agement - Max. update : 4Hz- Sensitivity : Acquisition : -160 dBm Tracking : -160 dBm Cold starts : -160 dBm- Operating Temp. -40°C to 85°C- Protocol : NMEA

How to Connect GPS and Host PC

GPS Host PC

GPS Data Format (NMEA)

(GPRMS : Recommended Minimum Specific GNSS Data)

Create New Project (Abstract)

Qt4 Application Type Projects >> Qt4 Gui Application

Project Name MyGPS

Project Location /nfs

Class Name MyWidget

Base Class QWidget

Window Size (LCD) 420 X 240 (Width-Height)

•Create New Project

Design UI

Window Size : 420 X 240 Design the form below with: - Qlabel - QTextEdit

QLabel

TextEdit

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class (Details)

#-------------------------------------------------## Project created by QtCreator 2011-02-08T15:16:01##-------------------------------------------------

TARGET = MyGPSTEMPLATE = app

SOURCES += main.cpp\ mywidget.cpp

HEADERS += mywidget.h

FORMS += mywidget.ui

MyGPS.pro

Implementing the MyWidget Class (Details)

mywidget.h#ifndef MYWIDGET_H#define MYWIDGET_H

#include <QWidget>#include <QSocketNotifier>#include <QTimer>#include <QMessageBox>#include <QStringList>

#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/ioctl.h>#include <fcntl.h>#include <linux/fs.h>#include <errno.h>#include <string.h>#include <termio.h>

namespace Ui { class MyWidget;}

class MyWidget : public QWidget { Q_OBJECTpublic: MyWidget(QWidget *parent = 0); ~MyWidget();

protected: void changeEvent(QEvent *e);

private: Ui::MyWidget *ui;

int m_fd; QSocketNotifier *m_notifier; int fd; int openSerialPort();

Implementing the MyWidget Class (Details)

mywidget.hprivate slots: void remoteDataIncoming();};

#endif // MYWIDGET_H

Implementing the MyWidget Class (Details)

main.cpp

#include <QtGui/QApplication>#include "mywidget.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); MyWidget w; w.show(); return a.exec();}

Implementing the MyWidget Class (Details)

mywidget.cpp (1/6)

#include "mywidget.h"#include "ui_mywidget.h"

MyWidget::MyWidget(QWidget *parent) : QWidget(parent), ui(new Ui::MyWidget){ ui->setupUi(this); setWindowTitle("My GPS"); m_fd = openSerialPort(); if(m_fd<0){ QMessageBox::warning(this, tr("Error"), tr("Fail to Open Serial Port!")); return; } m_notifier = new QSocketNotifier(m_fd, QSocketNotifier::Read, this); connect(m_notifier, SIGNAL(activated(int)), this, SLOT(remoteDataIncoming())); openSerialPort();}

Implementing the MyWidget Class (Details)

mywidget.cpp (2/6)

MyWidget::~MyWidget(){ delete ui;

if(m_notifier){ delete m_notifier; m_notifier=0; }

if(m_fd>=0){ ::close(m_fd); m_fd=-1; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (3/6)

void MyWidget::changeEvent(QEvent *e){ QWidget::changeEvent(e); switch (e->type()) { case QEvent::LanguageChange: ui->retranslateUi(this); break; default: break; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (4/6)

int MyWidget::openSerialPort(){ int fd=-1; const char *devName="/dev/ttyS1"; fd = ::open(devName, O_RDWR | O_NONBLOCK); if(fd<0){ return -1; } termios serialAttr; memset(&serialAttr, 0, sizeof serialAttr); serialAttr.c_iflag = IGNPAR; serialAttr.c_cflag = B9600 | HUPCL | CS8 | CREAD | CLOCAL; serialAttr.c_cc[VMIN] = 1; if(tcsetattr(fd, TCSANOW, &serialAttr) != 0){ return -1; } return fd;}

Implementing the MyWidget Class (Details)

mywidget.cpp (5/6)

void MyWidget::remoteDataIncoming(){ char c;

if(read(m_fd, &c, sizeof c) != 1){ QMessageBox::warning(this, tr("Error"), tr("Receive Error")); return; } else{ ui->status->setText("ttyS1 Connected"); }

QString tString = "";

tString = ui->textEdit_2->toPlainText();

Implementing the MyWidget Class (Details)

mywidget.cpp (6/6)

if(char(c)==13){ ui->textEdit_2->clear(); tString.clear(); } else{ tString.append(char(c)); ui->textEdit_2->setText(tString); } }

Run on Host PC

Run on MINI 6410

Simple Qt Example for MINI6410

UDP Socket Timer Server/Client

UDP Socket Timer Server

Create New Project (Abstract)

Qt4 Application Type Projects >> Qt4 Gui Application

Project Name UDPTimeServer

Project Location /nfs

Class Name MyWidget

Base Class QWidget

Window Size (LCD) 320 X 240 (Width-Height)

•Create New Project

Design UI

Window Size : 320 X 240 Design the form below with: - QLabel - QLineEdit - QPushButton

QLabel

LineEdit

PushButton

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class (Details)

#-------------------------------------------------## Project created by QtCreator 2011-02-08T19:46:56##-------------------------------------------------

QT += network

TARGET = UDPTimerServerTEMPLATE = app

SOURCES += main.cpp\ mywidget.cpp

HEADERS += mywidget.h

FORMS += mywidget.ui

UDPTimeServer.pro

Implementing the MyWidget Class (Details)

mywidget.h#ifndef MYWIDGET_H#define MYWIDGET_H

#include <QWidget>#include <QTimer>#include <QUdpSocket>#include <QDateTime>

namespace Ui { class MyWidget;}

class MyWidget : public QWidget { Q_OBJECTpublic: MyWidget(QWidget *parent = 0); ~MyWidget();

protected: void changeEvent(QEvent *e);

private: Ui::MyWidget *ui;

QUdpSocket *udpSocket; QTimer *timer; int portNumber;

private slots: void start_clicked(); void brodcastingDiagram();};

#endif // MYWIDGET_H

Implementing the MyWidget Class (Details)

main.cpp

#include <QtGui/QApplication>#include "mywidget.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); MyWidget w; w.show(); return a.exec();}

Implementing the MyWidget Class (Details)

mywidget.cpp (1/6)

#include "mywidget.h"#include "ui_mywidget.h"

MyWidget::MyWidget(QWidget *parent) : QWidget(parent), ui(new Ui::MyWidget){ ui->setupUi(this);

timer = new QTimer(this); udpSocket = new QUdpSocket();

connect(ui->start, SIGNAL(clicked()), this , SLOT(start_clicked())); connect(ui->stop, SIGNAL(clicked()), this, SLOT(close())); connect(timer, SIGNAL(timeout()), this, SLOT(brodcastingDiagram()));

setWindowTitle("Time UDP Server");}

Implementing the MyWidget Class (Details)

mywidget.cpp (2/6)

MyWidget::~MyWidget(){ delete ui;}

void MyWidget::changeEvent(QEvent *e){ QWidget::changeEvent(e); switch (e->type()) { case QEvent::LanguageChange: ui->retranslateUi(this); break; default: break; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (3/6)

void MyWidget::start_clicked(){ portNumber = QString (ui->lineEdit->text()).toInt(); ui->start->setEnabled(false); timer->start(1000);}

Implementing the MyWidget Class (Details)

mywidget.cpp (3/6)

void MyWidget::brodcastingDiagram(){ QDateTime currentTime = QDateTime::currentDateTime(); QString time = currentTime.toString();

QByteArray datagram(time.toAscii()); ui->time_show->setText(time);

udpSocket->writeDatagram(datagram.data(), datagram.size(), QHostAddress::Broadcast, portNumber);}

Run on Host PC

Run on MINI 6410

UDP Client

Create New Project (Abstract)

Qt4 Application Type Projects >> Qt4 Gui Application

Project Name UDPClient

Project Location /nfs

Class Name MyWidget

Base Class QWidget

Window Size (LCD) 420 X 240 (Width-Height)

•Create New Project

Design UI

Window Size : 420 X 240 Design the form below with: - QLabel - QLineEdit - QTextEdit - QPushButton

QLabel

TextEdit

PushButton

LineEdit

Implementing the MyWidget Class

mywidget.h

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class

mywidget.cpp

Implementing the MyWidget Class (Details)

#-------------------------------------------------## Project created by QtCreator 2011-02-08T20:13:19##-------------------------------------------------

QT += network

TARGET = UDPClientTEMPLATE = app

SOURCES += main.cpp\ mywidget.cpp

HEADERS += mywidget.h

FORMS += mywidget.ui

UDPClient.pro

Implementing the MyWidget Class (Details)

mywidget.h#ifndef MYWIDGET_H#define MYWIDGET_H

#include <QWidget>#include <QTimer>#include <QUdpSocket>#include <QTextCodec>

namespace Ui { class MyWidget;}

class MyWidget : public QWidget { Q_OBJECTpublic: MyWidget(QWidget *parent = 0); ~MyWidget();

protected: void changeEvent(QEvent *e);

private: Ui::MyWidget *ui; QUdpSocket *udpSocket; int portNumber;

private slots: void processPendingdatagram(); void startClient();};

#endif // MYWIDGET_H

Implementing the MyWidget Class (Details)

main.cpp

#include <QtGui/QApplication>#include "mywidget.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); MyWidget w; w.show(); return a.exec();}

Implementing the MyWidget Class (Details)

mywidget.cpp (1/6)

#include "mywidget.h"#include "ui_mywidget.h"

MyWidget::MyWidget(QWidget *parent) : QWidget(parent), ui(new Ui::MyWidget){ ui->setupUi(this);

//codec = QTextCodec::codecForName("eucKR");

udpSocket = new QUdpSocket(this); connect(ui->start, SIGNAL(clicked()), this, SLOT(startClient())); connect(ui->close, SIGNAL(clicked()), this, SLOT(close()));

setWindowTitle("Time UDP Client");}

Implementing the MyWidget Class (Details)

mywidget.cpp (2/6)

MyWidget::~MyWidget(){ delete ui;}

void MyWidget::changeEvent(QEvent *e){ QWidget::changeEvent(e); switch (e->type()) { case QEvent::LanguageChange: ui->retranslateUi(this); break; default: break; }}

Implementing the MyWidget Class (Details)

mywidget.cpp (3/6)

void MyWidget::processPendingdatagram(){ while(udpSocket->hasPendingDatagrams()){ QByteArray datagram; datagram.resize(udpSocket->pendingDatagramSize()); udpSocket->readDatagram(datagram.data(), datagram.size());

ui->textEdit->append(datagram.data()); ui->start->setEnabled(false); }}void MyWidget::startClient(){ portNumber = QString(ui->lineEdit->text()).toInt(); udpSocket->bind(portNumber); connect(udpSocket, SIGNAL(readyRead()), this, SLOT(processPendingdatagram()));}

Run on Host PC

Run on MINI 6410