How to create an ExportedDefine global variable in Simulink for Code Generation?

For Code Generation from Matlab code the storage class 'ExportedDefine' allows to make a simulink variable appear in generated C-code as

#define var_name var_value

as described here: https://de.mathworks.com/help/ecoder/ref/coder.storageclass.html.

Is there a way to do this for a (constant) variable when generating code from a Simulink model?

Thanks for your help!

Answer 1

[Fangjun Jiang]

Create a Simulink.Parameter, specify the storage class as "Define".

[Felix]

Thank you!

By creating a Simulink.Parameter in the base workspace like this:

z = Simulink.Parameter;
z.Value = uint32(10);
z.CoderInfo.StorageClass = 'Custom';
z.CoderInfo.CustomStorageClass = 'Define';

and referencing the parameter in the generated model like this:

I get a #define line in the generated code:

#define z                              10U

Because I do not use the Parameter in the model itself but rather want to use it in other C-files, I need to add to the signal Param_z to the code mappings for the Parameter to be defined. Is there a more elegant way to do this?

[Fangjun Jiang]

Your asked "Is there a way to do this for a (constant) variable when generating code from a Simulink model?"

If just want to have the .h file to do the #define, why not create the .h file directly, manually or create a script to write the text file.