Write a MATLAB function from which you can generate code. This example uses the function myAdd.m, which returns the sum of its inputs.

function c = myAdd(a,b)
c = a + b;
end

Create a coder.EmbeddedCodeConfig object for generation of a static library.

cfg = coder.config('lib','ecoder',true);

Set the EnableCustomReplacementTypes to true.

cfg.EnableCustomReplacementTypes = true;

Specify custom names for MATLAB built-in data types. For example, in the code, double is named as Custom_Double and int8 is named as Custom_Int8.

cfg.ReplacementTypes.double = "Custom_Double";
cfg.ReplacementTypes.int8 = "Custom_Int8";

Generate code by using the codegen function and the -config option.

codegen myAdd.m -args {1,int8(1)} -config cfg -report

The generated code contains custom data type names.

Create a writable folder myFiles.

Write a MATLAB function from which you can generate code. Save the function in myFiles. This example uses the function myAdd.m, which returns the sum of its inputs.

function c = myAdd(a,b)
c = a + b;
end

Write your header file myHeader.h that contains type definitions for the two inputs of the function myAdd.m. Save it in myFiles.

#if !defined(MYHEADER)
#define MYHEADER
typedef double Custom_Double;
typedef char Custom_Int8;
#endif

Create a coder.EmbeddedCodeConfig object for generation of a static library.

cfg = coder.config('lib','ecoder',true);

Specify custom names for MATLAB built-in data types. For example, in the code, double is named as Custom_Double and int8 is named as Custom_Int8.

cfg.EnableCustomReplacementTypes = true;
cfg.ReplacementTypes.double = "Custom_Double";
cfg.ReplacementTypes.int8 = "Custom_Int8";

Specify configuration properties for importing external header files.

% Include single header file

cfg.ReplacementTypes.IsExtern = true;
cfg.ReplacementTypes.HeaderFiles = "myHeader.h";
cfg.CustomInclude = 'C:\myFiles'; % Include path of the header file

% Include multiple header files

cfg.ReplacementTypes.IsExtern = true;
cfg.ReplacementTypes.HeaderFiles = "myHeader1.h;myHeader2.h;myHeader3.h";
cfg.CustomInclude = '"C:\Program Files\MATLAB\myFiles"'; % Include path of the header files

Generate code by using the codegen function and the -config option.

codegen myAdd.m -args {1,int8(1)} -config cfg -report

In the generated code, myAdd_types.h includes the external header file myHeader.h.

To read more about importing custom data type definitions from external header files, see Import Custom Data Type Definitions from External Header Files (Embedded Coder).

Open the dialog box for the configuration object that refers to the coder.ReplacementTypes object. For example:

cfg = coder.config('lib');
open('cfg');

In the dialog box, click the Code Appearance tab.

Select Enable custom data type replacement. The Custom Data Type Replacement table lists the name of the supported data types. Specify your custom names for these data types and press Enter.

You can import your own custom type definitions from external header files. Select the Import custom types from external header files check box. In the Header files text field, enter a semicolon-separated list of external header file names. For more information, see Import Custom Data Type Definitions from External Header Files (Embedded Coder).

The configuration object dialog box is not supported in MATLAB Online™.