Hello,
as You can see C caller does not show Port specification of the c code of the MatLab video shown here:
C Call Block

           #ifndef HEADER_H_
           #define HEADER_H_

           // Global Variable

           extern double gVec[5];
           extern double sum;


          //Function
          extern void cumulativeAdder(void);

          #endif

source code as below:

#include "header.h"
double gVec[5];
double sum = 0;
void cumulativeAdder(void){
    int idx = 0, tmpSum = 0;
   
    for(; idx < 5, ++idx){
        tmpSum = tmpSum + gVec[idx);  // Function reads "gVec" as INPUT
        }
       
    sum = tmpSum; //Function writes to "sum" as OUTPUT
   
}

 

Have you done this?

https://www.mathworks.com/help/simulink/ug/integrate-ccode-ccaller.html

 

Have you done this?
View attachment 247940
https://www.mathworks.com/help/simulink/ug/integrate-ccode-ccaller.html

Thanks I have not done this yet. let me do it and come back

 

You also have an error here:

        tmpSum = tmpSum + gVec[idx);  // Function reads "gVec" as INPUT

// should be

        tmpSum = tmpSum + gVec[idx];  // Function reads "gVec" as INPUT

 

Have you done this?
View attachment 247940
https://www.mathworks.com/help/simulink/ug/integrate-ccode-ccaller.html

after checking the Global variables, I have only checked this and still the problem is there

 

after checking the Global variables, I have only checked this and still the problem is there

You'll need to go through the whole document on that link and make sure that you've done everything, as well as fixing that error I pointed out

  tmpSum = tmpSum + gVec[idx);  // Function reads "gVec" as INPUT

// should be

tmpSum = tmpSum + gVec[idx];  // Function reads "gVec" as INPUT

 

You'll need to go through the whole document on that link and make sure that you've done everything, as well as fixing that error I pointed out

  tmpSum = tmpSum + gVec[idx);  // Function reads "gVec" as INPUT

// should be

tmpSum = tmpSum + gVec[idx];  // Function reads "gVec" as INPUT

I went through and nothing changed. I am upgrading my matlab license to 2020b and try.

 

I went through and nothing changed. I am upgrading my matlab license to 2020b and try.

If that doesn't work and you've gone through all the instructions and are still having a problem I recommend going to the MATLAB specific forum