Roger Johansson Embedded Real time systems - an Introduction 1 Embedded Real time systems – an Introduction What’s a ”Real time system”? The concept of control. Embedded real time control – some examples Some terminology ”Scheduling” – determination of actions ”Execution time analysis” – a prerequisite for scheduling
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Roger Johansson Embedded Real time systems - an Introduction 1 Embedded Real time systems – an Introduction n What’s a ”Real time system”? The concept.
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Roger Johansson
Embedded Real time systems - an Introduction 1
Embedded Real time systems – an Introduction
What’s a ”Real time system”? The concept of control. Embedded real time control – some examples Some terminology ”Scheduling” – determination of actions ”Execution time analysis” – a prerequisite for scheduling
Roger Johansson
Embedded systems
Embedded Real time systems - an Introduction 2
Wikipedia...
” An embedded system is a special-purpose computer system designed to perform one or a few dedicated functions, often with real-time computing constraints.
It is usually embedded as part of a complete device including hardware and mechanical parts.”
More distinct...
” An embedded system is a special-purpose digital system designed to perform dedicated functions with real-time computing constraints.
The digital system hardware is embedded as part of a complete device which might include other hardware such as mechanical, pneumatic or hydraulical parts.”
Roger Johansson
Embedded Real time systems - an Introduction 3
Digital systems
Server applications
Personal computing
Embedded systems
Real-Time Control systems
Safety-critical R-T control
Secure/RobustR-T control
Roger Johansson
Embedded Real time systems - an Introduction 4
In Control ? Swedish fighter JAS 39 GRIPEN
Roger Johansson
Embedded Real time systems - an Introduction 5
In Control ? but there is control ...
Roger Johansson
Embedded Real time systems - an Introduction 6
In Control ?
A control system is a feedback system
Time properties (temporal aspects) is fundamental for a well designed control system.
A computer designed for control has to handle REAL-TIME as desired by the controlled object.
Control requires feedback
Roger Johansson
Embedded Real time systems - an Introduction 7
traffic control
local control
train (consist) control
((( )))
((( )))
wayside control
traffic control
local control
train (consist) control
((( )))
((( )))
wayside control
Real time control applications
Roger Johansson
Embedded Real time systems - an Introduction 8
The “F-8 Digital Fly-By-Wire (DFBW)” validated fundamental concepts still used today. The first “by-wire” flight was in the 25’th of May in 1972. The project lasted for 13 years.