How to call user-defined C function having return and arguments with GetSet storage class

I am developing a Stateflow model where I need to call user defined C functions. The function prototype could be as follows

uint8 getset_Func(uint8 arg1, uint8 arg2, uint8 *arg3);

I have defined signal FuncCall with sorage class as GetSet and function header file is added in the code generation option.

I have added the option GetFunction as getset_$N and SetFunction option is empty.

But I am not able to use the signal in the stateflow. I have tried to use as var = FuncCall(temp1, temp2, &temp3);

This is giving error Unresolved function 'FuncCall'

How can I pass the arguments and return the result at the same time using GetSet storage class.

Answer 1

[Mark McBroom]

You should use coder.ceval() to call external C code from Stateflow. https://www.mathworks.com/help/simulink/slref/coder.ceval.html

You would write code similar to the folloiwng but substituting the name of your .c and .h files.

arg1 = uint8(4);
arg2 = uint8(5)
arg3 = uint8(6);
var = uint8(8);
coder.updateBuildInfo('addSourceFiles','foo.c');
coder.cinclude('foo.h');
var = coder.ceval("getset_Func", arg1, arg2, arg3 );

[Shijo]

Hi,

I am getting error while building the model

"Unresolved function 'coder.ceval in xx"

"Unresolved function 'coder.cinclude' in"

"Unresolved function 'coder.updateBuildInfo' in"

I ahve attached the screenshot

My objective is to create an input signal to the stateflow chart and the signal storage class as GetSet. So that the respective C function call should be invoked.