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Kursplan för

EDA222 - Real time systems
Kursplanen fastställd 2012-02-18 av programansvarig (eller motsvarande)
Ägare: MPCSN
7,5 Poäng
Betygskala: TH - Fem, Fyra, Tre, Underkänt
Utbildningsnivå: Avancerad nivå
Huvudområde: Datateknik, Elektroteknik, Informationsteknik

Undervisningsspråk: Engelska
Sökbar för utbytesstudenter
Blockschema: B
Max antal deltagare: 90

Modul   Poängfördelning   Tentamensdatum
Lp1 Lp2 Lp3 Lp4 Sommarkurs Ej Lp
0106 Tentamen 4,5 hp Betygskala: TH   4,5 hp   14 Mar 2013 fm M,  17 Jan 2013 em V,  26 Aug 2013 em V
0206 Laboration 3,0 hp Betygskala: UG   3,0 hp    

I program

MPCSN COMPUTER SYSTEMS AND NETWORKS, MSC PROGR, Årskurs 1 (obligatoriskt valbar)


Bitr professor  Jan Jonsson


EDA221   Realtidssystem D



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För kurser inom Chalmers utbildningsprogram gäller samma behörighetskrav som till de(t) program kursen ingår i.

Kursspecifika förkunskaper

Preparatory courses in concurrent programming and operating systems.


An embedded system is a computer system designed to perform one or a few dedicated functions. It is embedded in the sense that it is part of a complete device, often including electrical hardware and mechanical parts. For reasons of safety and usability, some embedded systems have strict constraints on non-functional behavior such as computational delay and periodicity. Such systems are referred to as real-time systems. Examples of real-time systems are control systems for cars, aircraft and space vehicles as well as computer games and multimedia applications. This course is intended to give basic knowledge about methods for the design and analysis of real-time systems.

Lärandemål (efter fullgjord kurs ska studenten kunna)

After the course the students shall be able to:

  • Formulate requirements for embedded systems with strict constraints on computational delay and periodicity.

  • Categorize and describe the different layers in a system architecture for embedded real-time systems.

  • Construct concurrently-executing tasks (software units) for real-time applications that interface to hardware devices (sensors/actuators).

  • Describe the principles and mechanisms used for designing run-time systems and communication networks for real-time applications.

  • Apply the basic analysis methods used for verifying the temporal correctness of a set of executing tasks.


Due to the extremely high costs associated with late discovery of problems in embedded systems, it is important to follow a good design methodology during the development of the software and hardware. One means for that is to use a system architecture that offers good component abstractions and facilitates simple interfacing of components. The course gives an overview of some state-of-the-art system architectures being used in the design of embedded systems, for example, EAST-ADL, AUTOSAR and AADL.

The system architecture philosophy dictates that the software of an embedded system is organized into multiple concurrently-executing tasks, where each task (or group of tasks) implements a specific functionality in the system. This approach allows for an intuitive way of decomposing a complex system into smaller software units that are simple to comprehend, implement and maintain. The software environment used in the course is based on the C programming language, enhanced with a software library that provides support for programming of concurrent tasks with timing (delay and periodicity) constraints. To that end, a main objective of the course is to demonstrate how the enhanced C programming language is used for implementing communication/synchronization between tasks, resource management and mutual exclusion. Since other programming languages uses monitors or semaphores to implement these functions, the course also contains a presentation of such techniques. In addition, the course demonstrates how to use low-level programming in C to implement interrupt-driven interaction with hardware devices. To demonstrate the general principles in real-time programming, the course also gives examples of how these techniques are implemented in other programming languages, such as Ada and Java.

In order to execute a program containing concurrent tasks there is a run-time system (real-time kernel) that distributes the available capacity of the microprocessor(s) among the tasks. The course shows how a simple run-time system is organized. The run-time system determines the order of execution for the tasks by means of a scheduling algorithm. To that end, the course presents techniques based on cyclic time-table based scheduling as well as scheduling techniques using static or dynamic task priorities. In addition, protocols for the management of shared hardware and software resources are presented. Since many contemporary real-time applications are distributed over multiple computer nodes, the course also presents topologies and medium access mechanisms for some commonly-used communication networks.

In real-time systems, where tasks have strict timing constraints, it is necessary to make a pre-run-time analysis of the system schedulability. The course presents three different analysis methods for systems that schedule tasks using static or dynamic priorities: utilization-based analysis, response-time analysis, and processor-demand analysis. In conjunction with this, the course also gives an account on how to derive the maximum resource requirement (worst-case execution time) of a task.


The course is organized as a series of lectures and a set of exercise sessions where the programming techniques and theories presented at the lectures are put into practice. The course material is examined by means of a final written exam. In addition, there is a compulsory laboratory assignment in which the students should implement the software for an embedded real-time application running on a hardware system consisting of multiple computer nodes interconnected by a bus network. Apart from the programming of cooperating concurrent tasks with strict timing constraints, the laboratory assignment also encompasses low-level programming of hardware devices such as timers and network controllers.


Burns and Wellings: Real-Time Systems and Programming Languages, 4th Edition, Addison-Wesley 2009.
Compendium of exercises.


Written exam and approved laboratory assignment.

Sidansvarig Publicerad: on 24 jan 2018.