By Filipe de Carvalho Moutinho, Luís Filipe Santos Gomes
This publication describes a model-based improvement technique for globally-asynchronous locally-synchronous allotted embedded controllers. This strategy makes use of Petri nets as modeling formalism to create platform and community self sustaining versions helping using layout automation instruments. To aid this improvement method, the Petri nets classification in use is prolonged with time-domains and asynchronous-channels. The authors’ method makes use of types not just delivering a greater knowing of the disbursed controller and enhancing the verbal exchange one of the stakeholders, but additionally to have the capacity to aid the complete lifecycle, together with the simulation, the verification (using model-checking tools), the implementation (relying on computerized code generators), and the deployment of the dispensed controller into particular platforms.
- Uses a graphical and intuitive modeling formalism supported through layout automation tools;
- Enables verification, making sure that the allotted controller was once thoroughly specified;
- Provides flexibility within the implementation and upkeep levels to accomplish wanted constraints (high functionality, low strength intake, diminished costs), allowing porting to assorted structures utilizing various conversation nodes, with out altering the underlying behavioral model.
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Additional resources for Distributed Embedded Controller Development with Petri Nets: Application to Globally-Asynchronous Locally-Synchronous Systems
It is important to note that the reusable sub-models should be created and the asynchronous-channels should be connected, in such a way that it is not possible to simultaneously have more than one message in each asynchronous-channel. This ensures that it is not required to generate the full state-space of the global GALS-DEC model, in order to generate the communication nodes required to support the components interaction (the asynchronous-channels implementation); the simulation and the verification of the global GALS-DEC model.
Cs, a partial function identifying a set of transitions as being channel sources (sources of communication channels): cs W T 0 ! 6) where CS is the set of channel targets. is, a partial function associating transitions with Boolean expressions: is W T 0 ! 7) where BE is the set of Boolean expressions checking input signal values. os, a partial function associating places with assignment expressions: os W P0 ! AE/ is the power set of AE, and AE is the set of assignment expressions assigning the result of mathematical expressions to output signals.
20). 21) The AckACs and NotACs are used to provide feedback about the delivery of messages and about their influence in the target transitions. This means that: (1) the source of an AckAC is always the target of another asynchronouschannel [Eq. 22], and (2) the source of a NotAC is always the target of another asynchronous-channel [Eq. 23]. 3 Asynchronous-Channels Execution Semantics Asynchronous-channels were proposed to connect sub-models with different timedomains, specifying the asynchronous interaction among distributed and synchronous components.
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