Difference between revisions of "Qt/Embedded"

Revision as of 00:52, 21 November 2006

Instructions to install and use QtEmbedded & Qt virtual frame buffer for Armadeus

Introduction

This page will summarize the process to build, install and use Qtopia.

You will also find instructions to setup a Host development environment for simulating applications before deploying them on the target (Qt virtual frame buffer). The builroot tree must be installed before the installation of Qt.

Requirements

You must install the libc++ on your target. If you want to use the Qt Gui module, you must have the libpng package.

Getting the packages

You must get the packages qtopia-core-opensource-src-4.2.0.tar.gz & qt-x11-opensource-src-4.2.0.tar.gz from the ftp server of the trolltech company as anonymous user (no password)

# ftp ftp.trolltech.com
# Name (ftp.trolltech.com:user): anonymous
# cd /qt/source
# get qtopia-core-opensource-src-4.2.0.tar.gz
# get qt-x11-opensource-src-4.2.0.tar.gz
# quit

or use the wget command:

# wget --user=anonymous ftp.trolltech.com:/qt/source/qtopia-core-opensource-src-4.2.0.tar.gz
# wget --user=anonymous ftp.trolltech.com:/qt/source/qt-x11-opensource-src-4.2.0.tar.gz

Installation

From now, we consider the variable ARMADEUS_ROOT_DIR as the root directory of the Armadeus SVN snapshot on your computer.

Copy and untar the downloaded packages into an installation folder called qt_installs:

# cd $ARMADEUS_ROOT_DIR
# mkdir qt_installs
# cp $DOWNLOAD_FOLDER/qtopia-core-opensource-src-4.2.0.tar.gz   \ 
   $DOWNLOAD_FOLDER/qt-x11-opensource-src-4.2.0.tar.gz $ARMADEUS_ROOT_DIR/qt_installs
# tar fxz qtopia-core-opensource-src-4.2.0.tar.gz
# tar fxz qt-x11-opensource-src-4.2.0.tar.gz

First you may optionally install/update Qt 4.2 on your system if is not installed yet....

# cd qt-x11-opensource-src-4.2.0
# ./configure
# make
# su root
# make install
# make confclean

Then as user, configure, compile the same package with the virtual frame buffer. Additionally you must compile and install the qvfb and qconfig tools. Once done, install all these into the $ARMADEUS_ROOT_DIR/qt folder

# ./configure -depths 8,16,32 -no-cups -release  -qvfb -prefix $ARMADEUS_ROOT_DIR/qt/qvfb -no-qt3support
# make
# make install
# cd tools/qvfb/ ; make
# install -m 755 -p ../../bin/qvfb $ARMADEUS_ROOT_DIR/qt/qvfb/bin
# cd ../qconfig ; make
# install -m 755 -p qconfig $ARMADEUS_ROOT_DIR/qt/qvfb/bin
# make confclean

Now, the essential: Qtopia

# cd qtopia-core-opensource-src-4.2.0
# ./configure -embedded arm -little-endian -depths 8,16,32 -no-cups -release -fast -qconfig medium \
    -prefix $ARMADEUS_ROOT_DIR/qt/qtopia.4.2.0
# make
# make install

Note: the compilation/installation of the Qtopia demos may not work, but all the Qt libraries are well done.

To install one or several different configurations, please read the Qt documentation included to understand the different configuration options. I advise you to preserve the qt_installs/qtopia-core-opensource-src-4.2.0 installation folder. Indeed, you may install Qtopia again in the following cases:

• You are using a new arm-linux-g++ compiler version
• You need several different installations because you are working on different projects ( For example the LCD properties are different).
• You want the Qt3 support
• you want to resize the Qt libraries to save some space on your rootfs.

Usage

by default Qt is installed in /usr/lib/ directory of your target rootfs before launching Qt on the target, you should set following env variables to the right value: QTDIR, LD_LIBRARY_PATH, etc...

Work in progress / to do list

• target installation
• examples & demos
• Customization of the Qt libs to have a custom Qt/E library well designed for Armadeus usage.

Links

• http://www.trolltech.com