Abstract : Our objective is to propose a methodology for the development of an automotive embedded middleware that provides communication services to the applicative level software. This work is focused on the design of automotive functions, where the nowadays context demands a middleware capable of offering standard communication services, hiding the localization of the participants in the exchanges, masking the heterogeneity of communication platforms, and ensuring that the timing constraints imposed on the exchanges and on the execution of the participants are met.
The proposed methodology is aimed for the design of an optimized middleware. For this purpose, it deals with two topics: the specification of an implementation architecture, and the construction of a feasible configuration. The implementation architecture is optimized because the middleware is well adapted to its execution environment (operating system OSEK/VDX OS), and minimizes the utilization of the available resources. It contributes, on the one hand, to a specification of a software architecture (built using design patterns), and, on the other hand, to mechanisms allowing to deploy this software architecture onto a concrete platform (under the form of a set of tasks). The algorithm proposed for the construction of a configuration determines feasible timing characteristics for the middleware and for the frames exchanged over a CAN bus. It covers also the calculation of a feasible set of priorities for the applicative tasks executing on each station of the bus. The correctness of the configuration is achieved by ensuring that the timing constraints imposed on the exchanges and on the execution of the applicative and middleware tasks are met.