08-17-2017, 12:30 AM
Embedded System Introduction
Embedded Systems Characteristics
Embedded System Design Process
Object-Oriented Design
Unified Modeling Language (UML)
Design Example: Model Train Controller
Module-1 Embedded Computing Embedded System Design - NTHU EOS Lab 2
Embedded System Introduction
Embedded Systems Characteristics
Embedded System Design Process
Object-Oriented Design
Unified Modeling Language (UML)
Design Example: Model Train Controller
Module-1 Embedded Computing Embedded System Design - NTHU EOS Lab 3
Definition
Embedded system: any device that
includes a programmable computer but is
not itself a general-purpose computer
e.g., PDA, printer, cell phone
e.g., TV, household appliances
e.g., automobiles: engine, brakes, etc
Requirements
Console controls up to 8 trains on 1 track.
Throttle has at least 63 levels.
Inertia control adjusts responsiveness with at least 8 levels.
Emergency stop button.
Error detection scheme on messages.
Ignore erroneous messages
Requirements form
name model train controller
purpose control speed of <= 8 model trains
inputs throttle, inertia, emergency stop,
train #
outputs train control signals
functions set engine speed w. inertia;
emergency stop
performance can update train speed at least 10
times/sec
manufacturing cost $50
power wall powered
physical
size/weight
console comfortable for 2 hands; < 2
lbs.
Conceptual specification
Before we create a detailed specification, we will make an
initial, simplified specification.
Gives us practice in specification and UML.
Good idea in general to identify potential problems before
investing too much effort in detail.