The paper describes the approach used to develop software for an automotive multiplex system.
With reference to well-known techniques used in high-performance multiprocessor systems, our approach tries to solve problems related to operating low performance micro-controllers. In the first part of this paper we briefly describe the system structure on which the software is implemented.
A detailed description of principles used in the software organization in given. Particular attention is placed on the data structure which is the assential reference for the description of the implemented program.
We also treat in detail, the methods used for reading the inputs and driving the outputs in an automotive environment.
A significant aspect of this study are the techniques followed for the design of the system functions.
In conclusion, as a complementary topic, we briefly describe the transmission protocol used for data exchange.