Embedded Linux: Das Praxisbuch (X.systems.press) (German by Joachim Schröder, Visit Amazon's Tilo Gockel Page, search

By Joachim Schröder, Visit Amazon's Tilo Gockel Page, search results, Learn about Author Central, Tilo Gockel, , Rüdiger Dillmann

Eingebettete Systeme steuern unbemerkt die Waschmaschine oder als Digitaler Sound Prozessor das Autoradio. Der Autor stellt leistungsfähige Linux-Derivate vor, die den Komfort der Schnittstellentreiber, des Multi-Threadings und eines Dateisystems bieten. Alle Beispiele sind vollständig durchimplementiert und on-line frei verfügbar. Das Buch eignet sich als Begleitbuch für Administratoren und Linux-Anwender, hilft aber auch Entwicklern in der Industrie, bei diesem pattern den Anschluss nicht zu verlieren.

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F¨ ur die Messung kam hierbei das (nachinstallierte) Tool HardInfo zum Einsatz. 5 OpenRISC Alekto Der OpenRISC Alekto der Firma VisionSystems ist ein Embedded-Rechner auf Basis eines ARM9-Prozessors [Vision Systems 08]. Eine große Zahl von Schnittstellen wie LAN, USB, Seriell (RS-232, RS-422 und RS-485), I2 C und GPIOs, ein m¨ oglicher Einsatz im Temperaturbereich von −10 ℃ bis +65 ℃ sowie eine robuste Ausf¨ uhrung machen den Alekto f¨ ur den industriellen Einsatz interessant. 7 zeigt die wichtigsten Eckdaten.

DSP-System im Emulator. Beispielsystem: KEIL µVision2 + KEIL MCBx51 Evaluation Board. 5 Software-Entwicklung 37 Abb. 9. Screenshot: SDK und Emulator KEIL µVision3. 10). Mittlerweile stehen Embedded-PCs zur Verf¨ ugung, die zwar in der Rechenleistung nicht mit modernen Desktop-PCs gleichziehen k¨onnen, aber dennoch eine angenehme Geschwindigkeit auch beim Betrieb einer modernen IDE bieten. , die PC-basierte SonySmart-Camera-Serie und moderne Boards mit Atom- oder VIA-Nano-CPU. Diese Plattformen bieten teilweise auch Anschlussm¨oglichkeiten f¨ ur Netzwerk, Monitor, Tastatur und Maus und erm¨ oglichen dieserart ein Entwickeln wie vom Desktop-PC gewohnt.

Ein g¨ angiges Verfahren hierf¨ ur ist das Earliest Deadline First-Verfahren. Hierbei wird von einem preemptiven System mit dynamischer Priorit¨ atenverteilung ausgegangen, ansonsten sind die Voraussetzungen die gleichen wie bei RMS. Die einfache Regel lautet nun: Ausgef¨ uhrt wird immer der Prozess, der aktuell die k¨ urzeste Deadline aufweist. Die Vorteile des Verfahrens sind, dass es einfach zu implementieren ist und den Prozessor bis zu 100 % ausnutzen kann. Ein gravierender Nachteil ist aber, dass ein korrekter Schedule nicht in allen F¨ allen sichergestellt werden kann.

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