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The Priority-Based Compilation

The priority-based low-level compilation approach uses the established compiling chain for SCCharts until the dependency analysis of the SCG is finished. From this point, either the netlist low-level compilation approach or the priority-based low-level compilation approach can be used to generate C code. Because of the different approaches, it is possible, that one of the compiler finds a valid schedule for an SCChart, while the other fails.

General

In contrast to the netlist compiler, this compiler targets only software. It is able to schedule cycles, as long as they only contain transition edges. This restriction is necessary to ensure, that the sequentially constructive model of computation is not violated.

The priority-based low-level compilation approach compiles an SCG enriched by the results of the dependency analysis to SCL_P, whose basis is the programming language C and which is enriched by the SCL_P macros. Therefore the regions of the SCG are fragmented into threads, whose priority determines the order in which the threads are executed. A thread might change its priority, which results in a context switch. The adiministration of the threads is done by the SCL_P macros. As the calculation of the thread priorities is not trivial, it done stepwise, which should help the user to understand how it is done. This is provided by a KiCo compilation chain, which can be called from the SCCharts editor or from the SCG editor.The image below shows the compilation chain as shown by the SCChart editor:

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