By Filipe de Carvalho Moutinho, Luís Filipe Santos Gomes
This publication describes a model-based improvement process for globally-asynchronous locally-synchronous disbursed embedded controllers. This procedure makes use of Petri nets as modeling formalism to create platform and community self sustaining versions assisting using layout automation instruments. To help this improvement strategy, the Petri nets type in use is prolonged with time-domains and asynchronous-channels. The authors’ procedure makes use of types not just offering a greater figuring out of the dispensed controller and enhancing the communique one of the stakeholders, but additionally to have the ability to aid the total lifecycle, together with the simulation, the verification (using model-checking tools), the implementation (relying on automated code generators), and the deployment of the allotted controller into particular platforms.
- Uses a graphical and intuitive modeling formalism supported via layout automation tools;
- Enables verification, making sure that the dispensed controller used to be safely specified;
- Provides flexibility within the implementation and upkeep levels to accomplish wanted constraints (high functionality, low strength intake, decreased costs), permitting porting to varied structures utilizing assorted communique nodes, with no altering the underlying behavioral model.
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2012a). The created files can be used as inputs in automatic code generators, such as those from IOPT-Tools: (1) C code generators (Campos-Rebelo et al. 2011; Pereira et al. 2012a) and (2) VHDL code generators (Gomes et al. 2007b; Pereira and Gomes 2013). To create the sub-models of each component (with a specific time-domain), the algorithm: • reads the PNML file of the global GALS-DEC model; • removes the nodes (places and transitions) that do not have the time-domain of that component; • removes the arcs that were connected to the removed nodes; • removes the asynchronous-channels and introduces: (1) additional sub-models; and (2) additional input events and output events (to specify the interaction between the components and the communication nodes); • saves the resulting sub-models into a new PNML file.
Event signals are directed arcs connecting transitions (they are asymmetrical communication channels). When the source transition fires, the target transition also fires (at the same time instant) if enabled. Condition signals are directed arcs connecting places to transitions, disabling or not the transitions. Directed synchronous channels, composed by one source transition and one or more target transitions, were also proposed in Costa and Gomes (2007) and Costa and Gomes (2009) to support the decomposition of a model into disjoint synchronously executed concurrent sub-models.
The model from Fig. 6 Distributed GALS Models Validation 35 Fig. 10 The state-space (reachability graph) of the models from Figs. 6 • when “AC2” message arrives to the target sub-model (in the behaviorally equivalent model, this is specified by the occurrence of event “IEAC2”), the transition “T2” fires (if enabled); • when transition “T3” fires, one message is sent through the asynchronouschannel “AC3”; 36 3 Development of Distributed Embedded Controllers • when the “AC3” message arrives to the target component (in the behaviorally equivalent model, the event “IEAC3” occurs), one message is sent through the asynchronous-channel “AC4” (in the behaviorally equivalent model one token is inserted in place “PAC4”) because transition “T8” is disabled; • however, if transition “T8” was enabled, then a message would be sent through the asynchronous-channel “AC5” instead of “AC4”.
Distributed Embedded Controller Development with Petri Nets: Application to Globally-Asynchronous Locally-Synchronous Systems by Filipe de Carvalho Moutinho, Luís Filipe Santos Gomes