Pointers

Pointers for Signals

To create a pointer in the generated code, you can configure a signal to use the ImportedExternPointer storage class or use an mpt.Signal (or mpt.Parameter for parameters) object with an ImportedExternPointer storage class.

C Construct

extern double *u1;

Procedure

This is a quick method to obtain pointers in the generated code. You cannot control the data type, which is decided by the model compilation process.

1. Create the ex_pointer_signal model using the blocks shown and follow the steps to configure the signals and model.

   

2. Label the signal to be imported as a pointer, in this example, u1.

3. Right-click the u1 signal line and select Signal Properties.

4. Select the Code Generation tab and specify the Storage Class parameter as ImportedExternPointer.

5. Click OK.

6. Press Ctrl+B to generate code.

Results

The generated code includes the extern declaration for the pointer in the ex_pointer_signal_private.h file.

extern real_T *u1;

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Pointers for Signals and Parameters Using Simulink Data Objects

C Construct

extern double *u1;

Procedure

You can control the data type by using a Simulink data object to generate a pointer. You can use this procedure for either a signal or parameter. To create a pointer for a parameter, use an mpt.Parameter instead of an mpt.Signal data object described in step 3.

1. Create the ex_pointer_signal_data_object model using the blocks shown and follow the steps to configure the signals and model.

   

2. Label the signal to be imported as a pointer, in this example, u1.

3. At the MATLAB command line, create a data object for signal u1.

   u1 = mpt.Signal;

4. In the base workspace, double-click u1 to open the mpt.Signal dialog box.

5. Specify the Storage class parameter as ImportedExternPointer.

6. Click Apply and OK.

7. Press Ctrl+B to generate code.

Results

The generated code includes the extern declaration for the pointer in the ex_pointer_signal_data_object_private.h file.

extern real_T *u1;

The ex_pointer_signal_data_object_private.h file imports the pointer into the generated code. To compile the code, you must declare and define the pointer in the main program.

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Arrays

Variant Systems

Related Products & Applications

• Simulink
• Control Design
• Signal Processing & Communications
• Model-Based Design
• Physical Modeling
• Verification & Validation

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