Qt Guide

This section describes the methods and procedures performed using the Qt GUI application development on MYD-AM335x, consists of two parts , the use of Qt SDK is the first part of the CD-ROM provided. General Qt application development using Qt SDK CD-ROM can be provided; second part describes how to compile Qt development environment when only Qt library the CD provided can not meet the development process need

Use Qt SDK CD-ROM supplied

• Unzip tslib to PC:

    $ sudo tar xvjf /media/cdrom/05-Linux_Source/Qt_Arm/ tslib-prebuild.tar.bz2 -C /opt

• Unzip Qt SDK to PC:

    $ sudo tar xvjf /media/cdrom/05-Linux_Source/Qt_Arm/qt-4.8.5-sdk.tar.bz2 -C /opt

• Configure environment variables and cross-compile Qt applications:

Please refer 1.10.4 Cross-compile Qt applications to set environment variables and cross-compile Qt applications.

Cross Compile Qt Development Environment

• Please refer to chapter 1.4.2 for installing cross compiler tool and setting the environment variables.

• Install “automake”, “libtool” and “autoconf” packages, compile and install “tslib”:

    $ sudo apt-get install automake libtool autoconf
    $ cd <WORKDIR>
    $ cp /media/cdrom/05-Linux_Souce/Qt_Arm/tslib-1.4.tar.bz2  ./
    $ tar –jxf tslib-1.4.tar.bz2
    $ cd tslib
    $ ./ts-build
    $ make install

Note: If error occurs on executing “ts-build”, modify the cross compiler tool path in “ts-build” file.

After compilation, “tslib” will be installed under directory “/usr/local/tslib”. Replace the text "# module_raw input" in the second line of “tslib/etc/ts.conf” under current directory with "module_raw input". Be sure that it must be top grid as shown in next Figure:

Figure 1-7

• Build Qt

Copy Qt source code to the working directory:

    $ cd <WORKDIR>
    $ cp  /media/cdrom/05-Linux_Source/Qt_Arm/\
    qt-everywhere-opensource-src-4.8.5.tar.bz2\     ./

Install necessary toolkits:

    $ sudo apt-get install xorg-dev libfontconfig1-dev
    libfreetype6-dev libx11-dev libxcursor-dev libxext-dev
    libxfixes-dev libxft-dev libxi-dev libxrandr-dev libxrender-dev

Begin to Compile:

    $ tar  -jxf  qt-everywhere-opensource-src-4.8.5.tar.bz2
    $ cd  qt-everywhere-opensource-src-4.8.5
    $ ./qt-build
    $ sudo make install

After compilation, qt-4.8.5 will be installed to directory “/opt/qt-4.8.5”.

Transplant Qt to the Development Board

• Copy the “tslib” installation files in “/usr/local/tslib” to directory “myd-am335x_rootfs /usr/local/ tslib”, which is used to compile the file system.

    $ cp –r /usr/local/tslib/bin \
    <WORKDIR>/myd-am335x_rootfs/usr/local/ tslib
    $ cp –r /usr/local/tslib/etc \
    <WORKDIR>/myd-am335x_rootfs/usr/local/ tslib
    $ cp –r /usr/local/tslib/lib \
    <WORKDIR>/myd-am335x_rootfs/usr/local/ tslib

• Copy qt-4.8.5 installation files in directory “/opt/qt-4.7.1” to “myd-am335x_rootfs /opt”:

    $ cp -r /opt/qt-4.8.5 <WORKDIR>/myd-am335x_rootfs/opt/

• Enter directory “/etc/init.d”, edit the script “qt.sh” as follows:

    export TSLIB_CONSOLEDEVICE=none
    export TSLIB_FBDEVICE=/dev/fb0
    export TSLIB_TSDEVICE=/dev/input/event1
    export TSLIB_CONFFILE=/usr/local/tslib/etc/ts.conf
    export TSLIB_PLUGINDIR=/usr/local/tslib/lib/ts
    export TSLIB_CALIBFILE=/etc/pointercal
    export  LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/tslib/lib:/opt/qt-4.8.5/lib
    export QT_QWS_FONTDIR=/opt/qt-4.8.5/lib/fonts
    export PATH=/bin:/sbin:/usr/bin/:/usr/sbin:/usr/local/tslib/bin
    if grep "hdmi" /proc/cmdline > /dev/null ; then
            export QWS_MOUSE_PROTO="Tslib:/dev/input/event1     MouseMan:/dev/input/mice"
    else
            export QWS_MOUSE_PROTO="Tslib:/dev/input/event1"
    fi
    export QWS_DISPLAY=:1

Export QWS_DISPLAY=:1Modify the “rc” file under directory “/etc/init.d/”of develop ment, add the following contents at the end of the document:

    if [ -e /etc/init.d/qt.sh ];then
    /etc/init.d/qt.sh
    fi

• Recompile the file system, then a “ubi.img” file containing the Qt libraries and “tslib” will be generated.

Cross-compile Qt applications

• Configure the Qt environment:

    $ export QT_PREFIX=/opt/qt-4.8.5
    $ export PATH=${QT_PREFIX}/bin:$PATH
    $ export QMAKESPEC=${QT_PREFIX}/mkspecs/qws/linux-arm-g++

• Creating a code:

    $ mkdir hellomyir
    $ cd hellomyir
    $ gedit hellomyir.cpp

Enter the following code:

    #include <QApplication>
    #include <QLabel>
    int main(int argc, char **argv)
    {
    QApplication app(argc,argv);
    QLabel label("Make Your idea Real!");
    label.show();
    return app.exec();
    }

• Build:

    $ qmake -project
    $ qmake
    $ make

• Copy the “hellomyir” to development board, and run it:

    #./hellomyir

A text will see on the LCD screen is "Make Your idea Real!".