File I/O C S-function Example

A simple C S-function which reads data from a file during simulation.
3,2K téléchargements
Mise à jour 1 sept. 2016

Afficher la licence

S-functions are used to create user defined blocks in Simulink. This S-function creates a block that reads data from a file incrementally at each time step of the Simulink simulation.
The S-function was written in C and uses the standard file I/O functions from the stdio.h library (fopen, fscanf, fclose). It is intended merely as an example.

The trickiest part of writing S-functions can sometimes be maintaining persistent data in subsequent calls to the S-function. This issue presents itself in this example. In order to read from the file throughout the simulation without closing and reopening the file each time step, the FILE pointer is stored in the PWork vector. This gives the S-function access to the FILE pointer at each step in the simulation.

In this S-function, the mdlStart function opens the file at the start of the simulation and the mdlTerminate function closes the file at the end. The mdlOutputs function is used to read data from the file at every time step.

To run the example:
1) Enter
mex -setup
at the MATLAB Command Prompt and select a compiler
2) Copy the attached files to the current MATLAB directory
3) Enter
mex cfileiosfun.c
to compile the S-function
4) Open the attached model and simulate.

Citation pour cette source

Jarrod Rivituso (2024). File I/O C S-function Example (, MATLAB Central File Exchange. Récupéré le .

Compatibilité avec les versions de MATLAB
Créé avec R2006b
Compatible avec toutes les versions
Plateformes compatibles
Windows macOS Linux
En savoir plus sur Block and Blockset Authoring dans Help Center et MATLAB Answers

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!
Version Publié le Notes de version

Updated license