Embedded Software Design and Programming of Multiprocessor System-on-Chip by Katalin Popovici Frédéric Rousseau Ahmed A. Jerraya & Marilyn Wolf

Author:Katalin Popovici, Frédéric Rousseau, Ahmed A. Jerraya & Marilyn Wolf
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

Logic operations: AND, OR, XOR, unary minus, arithmetic shift

Discrete blocks: delay, mux, demux, merge, selector, etc.

Conditional structures: if–then–else and switch-case

Repetitive structures: for-loop and while-condition-loop

Sources: constants, extern files, input ports

Sinks: display block, scope block, extern files, and output ports

3.3.1.2 Constraints on the S-Functions

The system architecture model may include user-defined functions written only in C programming language. The S-functions used to integrate the customized code need to be built by using the S-function Builder tool, which is the fastest and easiest way for the S-function generation compared with the manual implementation.

The arguments of the user-defined function have to respect a well-defined order. Basically, the function call accepts as parameters the input arguments followed by the output arguments, as illustrated in Fig. 3.7. The order of the parameter definition has to be identical with the order of the input/output ports declaration in the configuration panel of the S-function Builder tool. Moreover, the user-defined C function has to return a void value.

Fig. 3.7User-defined C-function

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