Pointer to Simulink Function

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Carlos Ma
Carlos Ma 2020-2-21
编辑： Carlos Ma 2020-2-24
Suppose I have a custom C function that accepts a function pointer as an argument,
float cFunc(float val, float (*ptrFunc)(float)) {
return ptrFunc(val);
}
and within Simulink, I defined a Simulink Function called "slxFunc" that takes a float as an input and outputs a float.
How do I obtain the pointer to slxFunc so that I could feed it to cFunc using a C-caller block?
Much appreciated, thanks.
/* edit 1: extra info */
The following C code is what I am trying to emulate,
#include <stdio.h>
/* times2 should be defined in simulink */
float times2(float val) {
return (2.0*val);
}
/* times3 should also be defined in simulink */
float times3(float val) {
return (3.0*val);
}
/* myFunc is defined in a .c file */
float myFunc(float val, float (*slxFunc)(float)) {
return (slxFunc(val));
}
int main()
{
/* printf should print 4.0 6.0 */
printf("%f\t%f\n", myFunc(2.0, times2), myFunc(2.0, times3));
return 0;
}
, where
times2
and
times3
are to be defined in the Simulink environment, and
myFunc
is implemented as a custom C function.
  2 个评论
stozaki
stozaki 2020-2-23
can you use stateflow?
Carlos Ma
Carlos Ma 2020-2-24
Thanks for replying @stozaki.
I'd really love to get it working in stateflow too, but it returned an unresolved data error.
Is there a way I could rectify this?

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回答（1 个）

stozaki
stozaki 2020-2-24
I attahced example model, hedder and souce C file.
Please try to simulate there.
Call C Library Functions in C Charts
  3 个评论
显示 1更早的评论
stozaki
stozaki 2020-2-24
Blocks provided by Simulink do not have the concept of pointers.
Can you use the newly added model?
Carlos Ma
Carlos Ma 2020-2-24
编辑：Carlos Ma 2020-2-24
Thanks for your help but again that's not what I am looking for. I have no problem calling C functions either using C Caller / Stateflow. The problem lies in passing a pointer to a Simulink function to a predefined C function, as described by the line
printf("%f\t%f\n", myFunc(2.0, times2), myFunc(2.0, times3));
If you parse this line in a generic c compiler, printf would return 4.0 and 6.0 as expected as I can pass the functions times2 and times3 into the function myFunc. The above line does not compile, however, in Stateflow with C being selected as the action language, as Simulink expects an argument for times2 and times3 but doesn't realise that I am trying to pass the functions are function pointers instead.
Thanks again if you have any ideas.

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