Qt + DS18B20 - jammy

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Qt + DS18B20

TQ2440 2009-10-30 21:24:55 阅读180 评论2 字号：大中小

       大四了，大学也快结束了~~打算以ARM9为控制核心 + Qt图形界面做个毕业设计。至于具体是做个什么东西，现在还没有头绪。唉~~~只怪学艺不精。

       在此之前没有学过C++，而Qt是以C++为设计基础，所以不得不硬着头皮看看C++的书籍。通过Qt设计一个显示温度的界面，可以将之前学习的底层驱动和应用程序联系上，同时也对Qt设计过程有个了解。

       首先，按照开发板的资料，建立好Qt的开发环境。不同的开发板可能提供的资料也有所差别。这里就不详细记录了~

 

       开发板上的Qtopia的版本：1.7.0 ，Linux内核版本：2.6.13 。用Qt designer设计好界面，如下图：

      

 

部件名称

数量

Form

1

GroupBox

2

LCDNumber

1

PixmapLbabel

3

PushButton

2

      

       接着将相应的部件连接好信号/槽(signal\slot) ：

       // signals and slots connections

    connect( cmdTemp, SIGNAL( clicked() ), this, SLOT( get_temp() ) );

    connect( cmdCls, SIGNAL( clicked() ), this, SLOT( close() ) );

connect( timer, SIGNAL( timeout() ), this, SLOT( lcd_display() ) );

 

l         按钮(cmdTemp)与获取温度函数get_temp() 建立连接

l         按钮(cmdCls)与关闭窗口函数close() 建立连接

l         定时器(timer)与显示函数lcd_display() 建立连接

 

 

       终端输入progen –o temperature.pro temperature.ui ，生成temperature的工程文件。

 

       将temperature.ui图形文件转换为代码文件，运行脚本：

#!/bin/sh

 

$QTDIR/bin/uic -o temperature.h temperature.ui

$QTDIR/bin/uic -o temperature.cpp -impl temperature.h temperature.ui

$QTDIR/bin/moc temperature.h -o moc_temperature.cpp

 

       终端输入$TMAKEPATH 和 tmake –o Makefile temperature.pro 生成Makefile文件。对Makefile文件进行相应的修改：

 

#############################################################################

# Makefile for building temperature

# Generated by tmake at 02:14, 2009/09/28

#     Project: temperature

#    Template: app

#############################################################################

 

####### Compiler, tools and options

 

CC   =     arm-linux-gcc

CXX       =     arm-linux-g++

CFLAGS =     -pipe -Wall -W -O2 -DNO_DEBUG

CXXFLAGS= -pipe -DQT_QWS_IPAQ -DQWS -fno-exceptions -fno-rtti -Wall -W -O2 -DNO_DEBUG

INCPATH       =     -I$(QTDIR)/include -I$(QPEDIR)/include

LINK      =     arm-linux-g++

LFLAGS =    

LIBS       =     $(SUBLIBS) -L$(QPEDIR)/lib -L$(QTDIR)/lib -L/opt/EmbedSky/crosstools_3.4.5_softfloat/gcc-3.4.5-glibc-2.3.6/arm-linux/ -lqpe -lqtopia -lqte

MOC      =     $(QTDIR)/bin/moc

UIC =     $(QTDIR)/bin/uic

 

TAR =     tar -cf

GZIP      =     gzip -9f

 

####### Files

 

HEADERS =   temperature.h

SOURCES =   main.cpp \

              temperature.cpp

OBJECTS =    main.o \

              temperature.o

INTERFACES =     temperature.ui

UICDECLS =  temperature.h

UICIMPLS =  temperature.cpp

SRCMOC       =     moc_temperature.cpp

OBJMOC       =     moc_temperature.o

DIST      =    

TARGET =     $(QPEDIR)/bin/temperature

DESKTOP =   $(QPEDIR)/apps/EmbedSky/temperature.desktop

ICON =          $(QPEDIR)/pics/temperature.png

INTERFACE_DECL_PATH = .

 

####### Implicit rules

 

.SUFFIXES: .cpp .cxx .cc .C .c

 

.cpp.o:

       $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $@ $<

 

.cxx.o:

       $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $@ $<

 

.cc.o:

       $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $@ $<

 

.C.o:

       $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $@ $<

 

.c.o:

       $(CC) -c $(CFLAGS) $(INCPATH) -o $@ $<

 

####### Build rules

 

 

all: $(TARGET)

       cp -f temperature.desktop $(DESKTOP)

       cp -f temperature.png $(ICON)

 

$(TARGET): $(UICDECLS) $(OBJECTS) $(OBJMOC)

       $(LINK) $(LFLAGS) -o $(TARGET) $(OBJECTS) $(OBJMOC) $(LIBS)

 

moc: $(SRCMOC)

 

tmake: Makefile

 

Makefile: temperature.pro

       tmake temperature.pro -o Makefile

 

dist:

       $(TAR) temperature.tar temperature.pro $(SOURCES) $(HEADERS) $(INTERFACES) $(DIST)

       $(GZIP) temperature.tar

 

clean:

       -rm -f $(OBJECTS) $(OBJMOC) $(DESKTOP) $(ICON) $(TARGET) $(TARGET)

       -rm -f *~ core

 

####### Sub-libraries

 

 

###### Combined headers

 

 

####### Compile

 

main.o: main.cpp \

              temperature.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/qpeapplication.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/qpeglobal.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/qlibrary.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/qcom.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/quuid.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/qtopiawinexport.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/timestring.h \

              /opt/EmbedSky/Qte/touch_qtopia/qtopia/include/qtopia/applicationinterface.h

 

temperature.o: temperature.cpp \

              temperature.h \

              temperature.ui

 

temperature.h: temperature.ui

       $(UIC) temperature.ui -o $(INTERFACE_DECL_PATH)/temperature.h

 

temperature.cpp: temperature.ui

       $(UIC) temperature.ui -i temperature.h -o temperature.cpp

 

temperature.o: temperature.cpp \

              temperature.h \

              temperature.ui

 

moc_temperature.o: moc_temperature.cpp \

              temperature.h

 

moc_temperature.o: moc_temperature.cpp \

              temperature.h

 

moc_temperature.cpp: temperature.h

       $(MOC) temperature.h -o moc_temperature.cpp

 

moc_temperature.cpp: temperature.h

       $(MOC) temperature.h -o moc_temperature.cpp

 

 

 

对temperature.cpp代码文件加入控制程序：

/****************************************************************************

** Form implementation generated from reading ui file 'temperature.ui'

**

** Created: Mon Sep 28 11:09:16 2009

**      by:  The User Interface Compiler (uic)

**

** WARNING! All changes made in this file will be lost!

****************************************************************************/

#include "temperature.h"

 

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

 

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

 

static int fd = -1;

 

static const char* const image0_data[] = {

"59 60 549 2",

"Qt c None",

"gF c #000000",

//………..

};//图片编译后的代码,很长,没有全部列出

 

/*

 *  Constructs a temperature_form which is a child of 'parent', with the

 *  name 'name' and widget flags set to 'f'

 */

temperature_form::temperature_form( QWidget* parent,  const char* name, WFlags fl )

    : QWidget( parent, name, fl )

{

    QPixmap image0( ( const char** ) image0_data );

    QPixmap image1( ( const char** ) image1_data );

    QPixmap image2( ( const char** ) image2_data );

    QPixmap image3( ( const char** ) image3_data );

    if ( !name )

    setName( "temperature_form" );

    resize( 320, 240 );

    setSizePolicy( QSizePolicy( (QSizePolicy::SizeType)5, (QSizePolicy::SizeType)5, sizePolicy().hasHeightForWidth() ) );

    setMinimumSize( QSize( 320, 240 ) );

    setMaximumSize( QSize( 320, 240 ) );

    setBaseSize( QSize( 320, 240 ) );

    setCaption( tr( "Temperature" ) );

    setIcon( image0 );

 

    GroupBox1 = new QGroupBox( this, "GroupBox1" );

    GroupBox1->setGeometry( QRect( 90, 10, 140, 60 ) );

    GroupBox1->setMaximumSize( QSize( 320, 240 ) );

    GroupBox1->setTitle( tr( "Current Temperture" ) );

 

    LCDNumber1 = new QLCDNumber( GroupBox1, "LCDNumber1" );

    LCDNumber1->setGeometry( QRect( 20, 20, 100, 30 ) );

    LCDNumber1->setNumDigits( 5 );

    LCDNumber1->setMode( QLCDNumber::DEC );

 

    PixmapLabel2 = new QLabel( this, "PixmapLabel2" );

    PixmapLabel2->setGeometry( QRect( 10, 10, 60, 60 ) );

    PixmapLabel2->setPixmap( image1 );

    PixmapLabel2->setScaledContents( TRUE );

 

    PixmapLabel1 = new QLabel( this, "PixmapLabel1" );

    PixmapLabel1->setGeometry( QRect( 250, 10, 60, 60 ) );

    PixmapLabel1->setPixmap( image2 );

    PixmapLabel1->setScaledContents( TRUE );

 

    GroupBox2 = new QGroupBox( this, "GroupBox2" );

    GroupBox2->setGeometry( QRect( 10, 80, 301, 90 ) );

    GroupBox2->setTitle( tr( "Infomation" ) );

 

    TextLabel1 = new QLabel( GroupBox2, "TextLabel1" );

    TextLabel1->setGeometry( QRect( 10, 20, 180, 20 ) );

    QFont TextLabel1_font(  TextLabel1->font() );

    TextLabel1_font.setFamily( "adobe-helvetica" );

    TextLabel1_font.setPointSize( 14 );

    TextLabel1_font.setBold( TRUE );

    TextLabel1->setFont( TextLabel1_font );

    TextLabel1->setText( tr( "by:Jammy-lee" ) );

 

    TextLabel2 = new QLabel( GroupBox2, "TextLabel2" );

    TextLabel2->setGeometry( QRect( 10, 40, 180, 21 ) );

    QFont TextLabel2_font(  TextLabel2->font() );

    TextLabel2_font.setFamily( "adobe-helvetica" );

    TextLabel2_font.setPointSize( 14 );

    TextLabel2_font.setBold( TRUE );

    TextLabel2->setFont( TextLabel2_font );

    TextLabel2->setText( tr( "QQ:34376050" ) );

 

    PixmapLabel3 = new QLabel( GroupBox2, "PixmapLabel3" );

    PixmapLabel3->setGeometry( QRect( 210, 10, 50, 50 ) );

    PixmapLabel3->setPixmap( image3 );

    PixmapLabel3->setScaledContents( TRUE );

 

    TextLabel3 = new QLabel( GroupBox2, "TextLabel3" );

    TextLabel3->setGeometry( QRect( 10, 60, 281, 20 ) );

    QFont TextLabel3_font(  TextLabel3->font() );

    TextLabel3_font.setFamily( "adobe-helvetica" );

    TextLabel3_font.setPointSize( 14 );

    TextLabel3_font.setBold( TRUE );

    TextLabel3_font.setUnderline( TRUE );

    TextLabel3->setFont( TextLabel3_font );

    TextLabel3->setText( tr( "Blog:http:\\\\blog.163.com/jammy_lee" ) );

 

    cmdTemp = new QPushButton( this, "cmdTemp" );

    cmdTemp->setGeometry( QRect( 70, 170, 71, 30 ) );

    cmdTemp->setText( tr( "Get 'C" ) );

 

    cmdCls = new QPushButton( this, "cmdCls" );

    cmdCls->setGeometry( QRect( 190, 170, 70, 30 ) );

    cmdCls->setText( tr( "Close" ) );

 

    timer = new QTimer(this);

   

 

    // signals and slots connections

    connect( cmdTemp, SIGNAL( clicked() ), this, SLOT( get_temp() ) );

    connect( cmdCls, SIGNAL( clicked() ), this, SLOT( close() ) );

    connect( timer, SIGNAL( timeout() ), this, SLOT( lcd_display() ) );

 

    timer -> start(1000);       //设置定时器

 

fd = open("/dev/ds18b20", 0);   //打开ds18b20设备文件，

                                //该设备文件是使用之前的设备驱动时建立好的。

    if(fd < 0)

    {

        perror("Can't open /dev/ds18b20 \n");

        exit(1);

    }

    printf("open ds18b20 success \n");

}

 

/* 

 *  Destroys the object and frees any allocated resources

 */

temperature_form::~temperature_form()

{

    // no need to delete child widgets, Qt does it all for us

}

 

/* 

 *  Main event handler. Reimplemented to handle application

 *  font changes

 */

bool temperature_form::event( QEvent* ev )

{

    bool ret = QWidget::event( ev );

    if ( ev->type() == QEvent::ApplicationFontChange ) {

    QFont TextLabel1_font(  TextLabel1->font() );

    TextLabel1_font.setFamily( "adobe-helvetica" );

    TextLabel1_font.setPointSize( 14 );

    TextLabel1_font.setBold( TRUE );

    TextLabel1->setFont( TextLabel1_font );

    QFont TextLabel2_font(  TextLabel2->font() );

    TextLabel2_font.setFamily( "adobe-helvetica" );

    TextLabel2_font.setPointSize( 14 );

    TextLabel2_font.setBold( TRUE );

    TextLabel2->setFont( TextLabel2_font );

    QFont TextLabel3_font(  TextLabel3->font() );

    TextLabel3_font.setFamily( "adobe-helvetica" );

    TextLabel3_font.setPointSize( 14 );

    TextLabel3_font.setBold( TRUE );

    TextLabel3_font.setUnderline( TRUE );

    TextLabel3->setFont( TextLabel3_font );

    }

    return ret;

}

 

void temperature_form::lcd_display()    //定时器每隔一段时间显示温度

{

    int tmp = 0;   

    read(fd, &tmp , sizeof(int));

    LCDNumber1->display(tmp);

}

 

void temperature_form::get_temp()       //点击按钮后显示五次温度

{

    char count = 5;

    int tmp = 0;

 

    while(count--)

    {

        read(fd, &tmp , sizeof(int));

        printf("the currently temperature is %d \n",tmp);

    LCDNumber1->display(tmp);

    sleep(1);

    }

}

 

    编译成功后,制作桌面启动器temperature.desktop:

[Desktop Entry]

Version=1.0

Encoding=UTF-8

Name=temperature_jammy

comment=Jammy_lee temperature

Exec=temperature

Icon=temperature

Type=Application

Name[zh_CN]=temperature_jammy

Name[zh_TW]=temperature_jammy

 

    最后,需要注意的是Makefile中的这段代码：

TARGET =     $(QPEDIR)/bin/temperature

DESKTOP =   $(QPEDIR)/apps/EmbedSky/temperature.desktop

ICON =          $(QPEDIR)/pics/temperature.png

 

意思是编译后的程序、桌面启动器和桌面的图标所在位置，我的PC上的

$(QPEDIR) = /opt/EmbeddedSky/Qte/touch_qtopia/qtopia/

因此，需要在该目录下将编译后的程序、桌面启动器和桌面的图标分别复制到开发板相应的文件夹里,重启后就能看见效果。

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