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4 Guidelines for Writing C MEX S-Functions
4-4
The MathWorks has a dopted terminology for these different requirements.
Respectively, the situations described above map to this terminology:
1 Noninlined S-function
2 Wrapper S-function
3 Fully inlined S-function
Noninlined S-Functions
A noninlined S-function is a C-MEX S-function that is treated identically by
Simulink and the Real-Time Workshop. In general, you implement your
algorithm once according to the S-function API. Simulink and the Real-Time
Workshop call the S-function routines (e.g.,
mdlOutputs) at the appropriate
points during model execution.
Significant memory and computation resources are required for each instance
of a noninlined S-function block. However, this routine of incorporating
algorithms into Simulink and the Real-Time Workshop is typical during the
prototyping phase of aprojectwhere efficiencyis notimportant.The advantage
gained by foregoing efficiency is the ability to change model parameters and/or
structures rapidly.
Note that writing a noninlined S-function does not involve any TLC coding.
Noninlined S-functionsare the default case for the Real-Time Workshop in the
sense that once you’ve built a C-MEX S-function in your model, there is no
additional preparation prior to clicking
Build in the RTW Page of the
Simulation Parameters dialog box for your model.
Wrapper S-Functions
A wrapper S-function is ideal for interfacing hand-written code or a large
algorithm t hat is encapsulated within a few procedures. In this situation,
usually the procedures reside in modules that are separate from the C-MEX
S-function. The S-f unction module typically contains a few calls to your
procedures. Since t he S-functi on module does not contain any parts of y our
algorithm, b ut o nly calls yo ur code, it is referred to as a wrapper S-function.
In addition to the C-MEX S-func tion wra p per, you n eed to create a TL C
wrapper that complements your S -function. The TLC wrapper is similar to the
S-function wrapper in that it contains calls to your algorithm.
- Writing S-Functions 1
- How to Contact The MathWorks: 2
- Contents 3
- Overview of 7
- S-Functions 7
- 1 Overview of S-Functions 10
- Introduction 11
- Direct Feedthrough 15
- Dynamically Sized Inputs 15
- that delays each 17
- Sample S-Functions 19
- As M-Files 25
- of theblock 29
- M-file S-function: 33
- % End of mdlInitializeSizes 40
- Passing Additional Parameters 44
- As C-MEX files 45
- Exception Free Code 57
- Update Diagram under your 62
- Edit menu 62
- Data View of S-Functions 63
- *y++ = *u++; /* Incorrect */ 65
- Parameter Changes 67
- The synopsis is 74
- Masked Multiport S-Functions 76
- Block-based Sample Times 80
- Port-based Sample Times 83
- Multirate S-Function Blocks 86
- Configuring Work Vectors 87
- Memory Allocation 91
- S-Function Initialization 92
- S, 0, 0.0); 103
- S, 1, 0.0); 111
- S, 0, 0); 121
- Function 128
- Function-Call Subsystems 139
- * call on 3rd element */ 140
- * call on 1st element */ 140
- (S,inputPortIdx,offset) 147
- (S,outputPortIdx,offset) 149
- (S,inputPortIdx) 151
- (S,outputPortIdx) 153
- time of an output port. This 153
- (S,st_index,value) 154
- Guidelines for Writing 167
- C MEX S-Functions 167
- Types of S-Functions 169
- Noninlined S-Functions 170
- Wrapper S-Functions 170
- Fully Inlined S-Functions 171
- Writing Wrapper S-Functions 174
- The TLC S-Function Wrapper 179
- How to Inline 180
- The Inlined Code 183
- Error Handling 189
- User Data Caching 189
- Example Model 190
- This is the code that is 192
- S-function block i n the 192
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