Cypress Semiconductor CY7C028V Bedienungsanleitung PDF herunterladen (Seite 3)

Middle-East J. Sci. Res., 19 (12): 1623-1629, 2014

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Haavard Nord and Eirik Chambe-Eng (the original

developers of Qt and the CEO and President, respectively,

of Trolltech) began development of "Qt" in 1991.

Qt is free and open source software. All editions

support many compilers, including the GCC C++ compiler

and the Visual Studio suite.

On August 9, 2012, Digia acquired Qt software

technologies from Nokia. About 125 Qt developers will be

transferred to Digia, with the immediate goal of bringing

Qt support to android, iOS and Windows 8 platforms.

Qt is most notably used in VLC media player, Safari

Browser, Autodesk Maya, The Foundry's Nuke, Adobe

Photoshop Elements, Skype, Virtual Box and Mathematica

and by the European Space Agency, DreamWorks,

Google, HP, KDE, Lucas film, Panasonic, Philips,

Samsung, Siemens, Volvo, Walt Disney Animation

Studios and Research In Motion. The Opera web browser

also uses Qt, but only as an interface to the Linux

platform.

Embedded Linux is the use of Linux in embedded

computer systems such as mobile phones, personal digital Qt is a cross-platform application and UI framework

assistants, media players, set-top boxes and other for writing web-enabled applications for desktop, mobile

consumer electronics devices, networking equipment, and embedded operating systems. This page contains

machine control, industrial automation, navigation links to articles and overviews explaining key components

equipment and medical instruments which have and techniques used in Qt development.

Low Memory Resources-RAM, Hard Disk systems is the need for a real-time operating system.

Low Processing Power-CPU (400 MHz, <= 1GHz) The definition of real-time here varies quite a bit. To some

Compact Size people, real-time means responding to an event in the

Low Cost Limitation one-microsecond range, to others it is 50 milliseconds.

Higher Performance and Efficiency in Speed, Power The hardness of real-time also varies quite a bit.

Due to its low cost and ease of customization, Linux deterministic response latencies to events. However, on

has been shipped in many consumer devices. many systems, when analyzed closely, we see a response

Linux is available for many architectures and an time requirement that is actually near real-time.

obvious candidate for an embedded system and it already Often the real-time requirement is a tradeoff of time

is being used widely in this area. Its open nature makes it and buffer space. With memory getting cheaper and CPUs

particularly attractive to developers. Development tool getting faster, near real-time is now more typical than hard

suites have begun to appear in response to the perceived real-time and many commercial operating systems that

need, although one can work without such luxury and claim to be real-time are far from being hard real-time.

employ less integrated tools already available in Linux. Usually, when you get into the detailed design of these

New embedded systems companies using Linux have systems, there are warnings that the drivers' interrupts

opened for business and various older embedded systems and applications must be very carefully designed in order

companies have added Linux to their product line. to meet real-time requirements.

Qt for Embedded Linux is a C++ framework for GUI RT-Linux (Linux with real-time extensions) contains

and application development for embedded devices. It time critical functions to provide precise control over

runs on a variety of processors. Qt for Embedded Linux interrupt handling, through the use of an interrupt

provides the standard Qt API for embedded devices with manager and does a good job of making sure that critical

a lightweight Graphics system. interrupts get executed when needed. The hardness

One of the most important issues with embedded

Some systems need hard real-time response, with short

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S. Philomina 1

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