How to free memory from C-code in simulink embedded matlab code block

Question

Rodrigo Lopez Negrete 2022-6-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/1749995-how-to-free-memory-from-c-code-in-simulink-embedded-matlab-code-block

回答： Walter Roberson 2022-6-28

Hi all,

I have an embedded matlab code block in a simulink simulation that makes calls to c functions to allocate memory and do some calculations. For example the code below: assume varA, varB are data structures created and allocated in C using the memallocfun function call.The types are defined in C.

persistent firstCall varA varB

if isempty(firstCall)

firstCall =1;

varA = coder.opaque('somestruct1 *','NULL','HeaderFile','defs.h');

varB = coder.opaque('somestruct2 *','NULL','HeaderFile','defs.h');

coder.ceval('memallocfun',coder.ref(varA),coder.ref(varB));

end

coder.ceval('workfun',coder.ref(varA),coder.ref(varB));

This code works and runs properly. My issue is that after the simulation is done I'd like to free the memory that was allocated by memallocfun. Should I do that in the StopFcn callback? Will StopFcn have access to the persistent variables created here? Otherwise, where should I free the memory created by C?

thanks!

Rodrigo