Difference between revisions of "Qt/Embedded"

Revision as of 00:20, 20 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.

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.

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 installation because you need different depths (bit per pixels for different LCD)
• 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

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

Links

• http://www.trolltech.com