Difference between revisions of "Qt/Embedded"

Revision as of 14:43, 15 June 2010

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

Introduction

This page will summarize the process to build, install and use Qt Embedded (previously known as 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.

Installation

From November 20th 2007, Qt Embedded is now fully integrated in Armadeus Buildroot (old procedure is kept here). So to install it you have to:

 [armadeus]$ make menuconfig

Package Selection for the target  --->
    [*] Graphic libraries and applications (graphic/text)  --->

and then

(don't forget -depths 8,16 option)

• If you want touchscreen support:

    Mouse drivers  --->
        ...
        [*] tslib

then:

 [armadeus]$ make

1 hour and ~1 GBytes later (depending on your system and the configuration you choosed) your will have the beast. You can then reflash your rootfs.

Test

If you want to test it, compile and put some examples in your TFTP directory:

 $ cd buildroot/build_armvXX/qt-embedded-linux-opensource-src-4.4.3/examples/widgets/
 $ qmake widgets.pro
 $ make
 ...
 $ cp calculator/calculator /tftpboot

and then launch it on your APF:

 # cd /usr/bin/
 # tftp -g -r calculator 192.168.0.xx (Host IP)
 # chmod a+x calculator
 # export QWS_MOUSE_PROTO="Tslib:/dev/input/event0"
 # 
 # calculator -qws

Demo

A client/server (with GUI) demo is available under: software/demos/ApfDacClientServer/. It could be a good starting point to show you how to create standalone Qt applications (will probably require some modifications in src/build.sh depending on your Host Qt installation).

GUI with widgets taken from http://www.qt-apps.org

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... To be completed ......

How to cross-compile an application using Qtopia

The first thing you need to do is to define a specific "qmake specs directory" for armadeus. Here for example:

mkdir $APPLICATION_ROOT_DIR/mkspecs/linux-arm-g++

and install the two following files into this new directory: qmake.conf & qplatformdefs.h. qmake.conf may be customized if necessary.

Then, you must define two typical environment variables : QTDIR which defines the Qtopia installation path & QMAKESPEC which defines the path to the configuration files of the qmake tool

Here two typical lines of a Qtopia application building script

export QTDIR=/home/demo/demos/Buitinqt/buildroot/build_armv4t/qtopia-core-opensource-src-4.3.1/
export QMAKESPEC= $APPLICATION_ROOT_DIR/mkspecs/linux-arm-g++

Adapt the QTDIR path to your own installation path and compile your code now, using theses commands:

# build the makefile with the qmake command (See Trolltech documentation for details about qmake):
qmake -spec $QMAKESPEC my.pro
# and now compile the beast... :
make

Good luck....

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.

Licenses

Since Qt 4.5.2 new licensing schemes are available: http://www.qtsoftware.com/products/licensing/licensing#qt-gnu-lgpl-v

Links

• PyQt
• http://www.trolltech.com
• 16 colors framebuffer with Qt
• Qtopia Core Environment Variables
• Tutorial on Qt setup for embedded devt