Can C code user function be used in Simulink S-Function
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I have a large simulation in Simulink that uses S-functions written in c-code. For readability I would like to define a user function and call it from with an S method.
for example, see snippet below. Is this allowable in an S-Function? Is there anything I should be aware of or look out for?
static void UserFnc( real_T u, real_T v, real_T * x); // delcare
....
....
static void mdlOutputs(SimStruct *S, int_T tid)
{
..........
UserFnc( real_T u, real_T v, real_T * x); // use here
.........
.........
UserFnc( real_T u, real_T v, real_T * x); // and use here
.........
}
........
........
static void UserFnc( real_T u, real_T v, real_T * x) // define here
{
// * User code here */
}
/*=============================*
* Required S-function trailer *
*=============================*/
#ifdef MATLAB_MEX_FILE /* Is this file being compiled as a MEX-file? */
#include "simulink.c" /* MEX-file interface mechanism */
#else
#include "cg_sfun.h" /* Code generation registration function */
#endif
采纳的回答
Walter Roberson
2020-12-9
编辑：Walter Roberson
2020-12-9
0 个投票
Yes, see coder.ceval()
On the other hand, your code structure looks to me to be more like the implementation of a Level-1 S Function, and the above is not the way to invoke a complete S-function.
4 个评论
Brian Tremaine
2020-12-9
编辑：Brian Tremaine
2020-12-9
Walter Roberson
2020-12-9
The S-Function block provides access to S-functions from a block diagram. The S-function named as the S-function name parameter can be a Level-2 MATLAB® or a Level-1 or Level-2 C MEX S-function
We thus see that a C-implemented Level 1 S function is permitted.
The code you posted does not include any MATLAB, so it does not look like you are embedding C within a Level-1 S Function, it appears you are implementing the Level-1 S function as C. Which is not a problem. If you wanted to mix MATLAB and C in the same Level-1 S function, I would have to think about that more; I am not sure if it can be done.
Brian Tremaine
2020-12-9
Walter Roberson
2020-12-9
MATLAB has no problem with you creating separately linked C files if appropriate, or putting everything into one file if appropriate.
But if you are working on "current states" then you should be looking into whether you should be switching to Level 2 S Function. The major difference between Level 1 and Level 2 is the treatment of state vectors (and the fact that Level 2 allows you to access and control other blocks .)
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