The Design Language of Statecharts

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# The Design Language of Statecharts - PowerPoint PPT Presentation

The Design Language of Statecharts. The Design Language of Statecharts. Initial state. Finite State Machine R , S, T – States a , b , c , d - Events Arrows - State transitions. optional. Event: a , b , c , ... a or/and b not a dly(t), tm(a,t) tr(C)/fs(C). Conditions:

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### The Design Language of Statecharts

Dr. Vered Gafni – Real time systems development by the formal approach

The Design Language of Statecharts

Initial state

Finite State Machine

• R, S, T – States
• a, b, c, d - Events
• Arrows - State transitions

optional

Event:

a, b, c, ...

a or/and b

not a

dly(t), tm(a,t)

tr(C)/fs(C)

Conditions:

A, B,...

A or/and B

not(A)

in(S)

x=y, x<y,….

Actions:

a,b,…

tr!(C)/fs!(C)

x := v

rd!(x)

Dr. Vered Gafni – Real time systems development by the formal approach

Examples

Split on condition

Dr. Vered Gafni – Real time systems development by the formal approach

Sub-States: Sequential Refinement
• S is a super-state w.r.t {S1, S2, S3 }
• Super-state transitions (priority)
• History entrance (H* -deep history)

Dr. Vered Gafni – Real time systems development by the formal approach

Example of Sequential Refinement

Equivalence

up to priorities

Dr. Vered Gafni – Real time systems development by the formal approach

Sub-states: Parallel Refinement

Dr. Vered Gafni – Real time systems development by the formal approach

Specification of Time Constraints

• Delay: To turn on the furnace open the oil valve, and after 3 seconds activate ignition
• RTC: Execute control loop at 10Hz rate

Dr. Vered Gafni – Real time systems development by the formal approach

• Deadline: Whenever train enters XR, gate should be closed within 10 seconds; otherwise an alarm will be activated

Dr. Vered Gafni – Real time systems development by the formal approach

Where Timeout is useful ?

Dr. Vered Gafni – Real time systems development by the formal approach

Synchronization Techniques I

Dr. Vered Gafni – Real time systems development by the formal approach

Synchronization Techniques II

Dr. Vered Gafni – Real time systems development by the formal approach

Synchronization Techniques III

Dr. Vered Gafni – Real time systems development by the formal approach

Dr. Vered Gafni – Real time systems development by the formal approach

Crossing Control: Sequential Design

Dr. Vered Gafni – Real time systems development by the formal approach

Crossing Control: Parallel Design

Dr. Vered Gafni – Real time systems development by the formal approach

Example: Automatic Cruise Control

Dr. Vered Gafni – Real time systems development by the formal approach

Automatic Cruise Control

Dr. Vered Gafni – Real time systems development by the formal approach

State Operating (sub-state of Active)

Dr. Vered Gafni – Real time systems development by the formal approach

State CommandMonitor (component of Operating)

Dr. Vered Gafni – Real time systems development by the formal approach

Statemate

A Real-Time Design Tool

• Provides for representation of 3 system views:
• What:
• - the activities the system should do, and inter-activities
• data flow
• When:
• - the timing and synchronization of activities activation and
• data transfer
• Where:
• - in what subsystem the each activity should be implemented

Dr. Vered Gafni – Real time systems development by the formal approach

Basic Components

A

E3

A1

u

f

f

f

f

C

h

e

A2

r

A3

E1

E2

CC

v

w

q

s

A2_1

A2_2

x

Dr. Vered Gafni – Real time systems development by the formal approach