How can I use a macro from custom C code in code generated by MATLAB Coder R2022b?
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I am writing MATLAB code intended for code generation with MATLAB Coder in MATLAB R2022b. I have a "uint8" macro "MYVAL" defined in a C header file “myHeader.h”.
I want to use my macro from "myHeader.h" in the code generated from MATLAB Coder. Is there a way to use my macro in the generated code?
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MathWorks Support Team
2023-7-31
One way to use a custom macro in generated code is with the "coder.opaque" function. Please see the documentation for this function below:
Using the "coder.opaque" function, you can use a C macro in the default value ("value") argument. For instance, the MATLAB function below sets a variable "x" equal to a macro "MYVAL" defined in a custom header file:
function x = myFunction() %#codegen
x = coder.opaque('uint8', 'MYVAL', 'HeaderFile', '"myHeader.h"');
x = uint8(x);
end
If you generate C code from the above function, the generated function returns “MYVAL”. Please see the generated C function below:
/* Function Definitions */
uint8_T myFunction(void)
{
return (uint8_T)MYVAL;
}
Please see the attached file "MacroInGeneratedCode.zip" for the files to follow this example.
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