Embedded Software Development - Lecture03

Embedded Software Engineering EMBEDDED SOFTWARE ARCHITECTURES

Contents

Software Architectures

Decision Factors

Some Examples

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4 Basic SW Architectures

Round-Robin Architecture

Slide 13

An Application

Digital Multimeter

Slide 16

Discussion

Shortcomings

Round-Robin with Interrupts

A Little Bit More Control

The Architecture

RR vs. RR-INT

Slide 23

An Example of A Simple Bridge

Some Assumptions

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Possible Code

Slide 29

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Bridge code

Slide 33

Cordless Bar-Code Scanner

Characteristics of RR-with-Interrupts

Slide 36

Slide 37

Examples of Systems for which RR-with-Interrupts does not work well

Function Queue Scheduling Architecture

Function-Queue Scheduling

The Framework of FQS

Worst-case Execution Time

Real-Time Operating System

A Paradigm

Worst case execution

Advantages / Disadvantages of RTOS

Priority Levels

Selecting an Architecture

Characteristics of Architectures