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Vered Gafni, 20051 The Design Language of Statecharts

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Vered Gafni, 20052 Simple Statechart Finite State Machine R, S, T – States a, b, c, d - Events Arrows - State transitions (source-less arrow denotes an initial state).

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Vered Gafni, 20053 Transition Events Syntax

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Vered Gafni, 20054 Events {a, b, c,.... } atomic events: a or b a occurs or b occurs a and b a occurs and b occurs not(a) a does not occur tm(a,t) t time-units after the occurrence of a tr( C ) condition C becomes true fs( C ) condition C becomes false en(S) state S is entered ex(S) state S is exited

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Vered Gafni, 20055 Conditions A, B,.... atomic conditions: A or B A is true or B is true A and B A is true and B is true not(A) A is false in(S) True while the system is in state S X=Y, X

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Vered Gafni, 20056 Actions a,b,… atomic actions tr!(C) make condition C True fs!(C) make condition C False wr!(V) write variable V rd!(V) read variable V atomic actions also considered event generation

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Vered Gafni, 20057 Example of Compound Transition

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Vered Gafni, 20058 Transition Connectors

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Vered Gafni, 20059 L H valv e Water-level sensor Controller Valve command

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Vered Gafni, 200510 Sub-States: Sequential Refinement S is a super-state w.r.t {S1, S2, S3 } Super-state transitions (priority) History entrance (H* -deep history)

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Vered Gafni, 200511 Example of Sequential Refinement Equivalence up to priorities

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Vered Gafni, 200512 Sub-states: Parallel Refinement Events broadcasting

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Vered Gafni, 200513 דוגמא - בקר שיוט רכב Automatic Cruise Control

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Vered Gafni, 200514 Automatic Cruise Control

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Vered Gafni, 200515 Operating

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Vered Gafni, 200518 Railroad Crossing Control

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Vered Gafni, 200519 Crossing Control: Sequential Design

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Vered Gafni, 200520 Crossing Control: Parallel Design

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Vered Gafni, 200521 Using Timeout Delay Periodic activation deadline

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Vered Gafni, 200522 Timeout as Delay To activate the furnace open the oil valve, and after 3 seconds operate ignition Idle Ignition_ delay Furnace _Active Activate/Open_oil_valve tm(Activate,3sec)/Ignite

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Vered Gafni, 200523 Timeout for Periodic Activation Execute control loop at 10Hz rate RTC /tick tm(tick,100mls)/tick WaitTick Control Loop tick done

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Vered Gafni, 200524 Timeout as Deadline Whenever train enters XR, gate should be closed within 10 seconds; otherwise an alarm will be activated WaitTrain Tin/CloseGate tm(en(Closing),10sec)/Alarm Closed Closing GateClosed FailClosing

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Vered Gafni, 200525 Synchronization Techniques I

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Vered Gafni, 200526 Synchronization Techniques II

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Vered Gafni, 200527 Synchronization Techniques III

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Vered Gafni, 200528 Transition Functions [K] true[K] where ‘true’ is an event that occurs at every time instant

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Vered Gafni, 200529 Magnum 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

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Vered Gafni, 200531 Basic Components A A1 A2 A3 C A2_1 A2_2 E1 E2 E3 CC u vw q e f h r x s

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