How to Develop Qt Program Simple Examples (5)

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


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


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


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();}


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; }}


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; }}


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");

}


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


Serial Communication



Project Name SerialCom


Class Name MyWidget

Base Class QWidget



Design UI

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

QLabel

PushButton

TextEdit


mywidget.h


mywidget.cpp



TARGET = SerialComTEMPLATE = app




SerialCom.pro



#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>




private: Ui::MyWidget *ui;

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


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

#endif // MYWIDGET_H


main.cpp



mywidget.cpp (1/5)


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");}


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; }}


mywidget.cpp (3/5)



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)));}


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


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)



Project Name MyGPS


Class Name MyWidget

Base Class QWidget



Design UI

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

QLabel

TextEdit


mywidget.h


mywidget.cpp



TARGET = MyGPSTEMPLATE = app




MyGPS.pro



#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>





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


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



main.cpp



mywidget.cpp (1/6)


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();}


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; }}


mywidget.cpp (3/6)



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;}


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();


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


UDP Socket Timer Server/Client

UDP Socket Timer Server



Project Name UDPTimeServer


Class Name MyWidget

Base Class QWidget



Design UI

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

QLabel

LineEdit

PushButton


mywidget.h


mywidget.cpp



QT += network

TARGET = UDPTimerServerTEMPLATE = app




UDPTimeServer.pro



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





QUdpSocket *udpSocket; QTimer *timer; int portNumber;

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



main.cpp



mywidget.cpp (1/6)


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");}


mywidget.cpp (2/6)

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



mywidget.cpp (3/6)

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


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



Project Name UDPClient


Class Name MyWidget

Base Class QWidget



Design UI

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

QLabel

TextEdit

PushButton

LineEdit


mywidget.h


mywidget.cpp



QT += network

TARGET = UDPClientTEMPLATE = app




UDPClient.pro



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




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

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



main.cpp



mywidget.cpp (1/6)


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");}


mywidget.cpp (2/6)

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



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

How to Develop Qt Program Simple Examples (5)

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Transcript of How to Develop Qt Program Simple Examples (5)