About C caller usage

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hoang tuan
hoang tuan 2020-3-19
评论： Yao Ren 2024-3-12
Hello
I'm trying to use the C-caller block to import my C-code into simulink.
now i'm trying just a simple code as below:
#include <stdio.h>
int add_fnc (int a, int b)
{
int c;
c = a +b;
return c;
}
I do as the instruction in configuration parameter to set source file.
I run the c-caller block and set the variable name is add_func.
The warning is can not find add_func.
Can you support me?
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hoang tuan
hoang tuan 2020-3-19
Thank you.
And it seems we have to create header file to mention the function prototype first.
We can not add direct the c source code only.
Yao Ren
Yao Ren 2024-3-12
Yes, a C function has to be "extern" declared to be visible to a Simulink model. You can use a ".h" header file to declare the C functions.
Alternatively, without writing a new ".h" file, you can declare the C function directly in model's "Configuration paramters > Simulation Target > Custom Code > Include headers" section using following statement.
extern int add_fnc (int a, int b);

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