Pointer to Simulink Function

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.

[stozaki]

can you use stateflow?

[Carlos Ma]

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?

Answer 1

[stozaki]

I attahced example model, hedder and souce C file.

Please try to simulate there.

Call C Library Functions in C Charts

[Carlos Ma]

Perhaps we have a misunderstanding here, your example runs fine but it doesn't describe what I am trying to implement. I have no problem passing pointers to variables, but am having a problem with passing a pointer to a function inside Simulink.

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.

Thanks again.

[stozaki]

Blocks provided by Simulink do not have the concept of pointers.

Can you use the newly added model?

[Carlos Ma]

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.