How to create union in simulink

Question

WJKIM 2024-5-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2116362-how-to-create-union-in-simulink

评论： Meghna 2024-7-16

在 MATLAB Online 中打开

Hellow.

I have a question about how to union in simulink in simulink coder.

I know how to create the bus of struct using the 'Simulink bus' in dictionary file. (*.sldd)

However, i can't see the part that creates the union.

Does Mathoworks support the method of generating code an union as shown below?

If so, could you tell me how?

thank you

**************************************************************************************

typedef union
{
    uint32 R;
    uint16 H;
} Test_u;

**************************************************************************************

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Answer 1

Anurag Ojha 2024-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/2116362-how-to-create-union-in-simulink#answer_1454242

Hello

You can refer to following file exchange link to get more information:

https://www.mathworks.com/matlabcentral/fileexchange/116520-use-union-datatype-in-simulink

I hope this helps you resolve your query

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WJKIM 2024-5-13

Hello,

I have a question about your link.

I found the 'TempBus' in *.m file. And its configuration of code generation is as follow:

Data scope : Imported

Header file : DataTypeImport.h

However, i don't find the DataTypeImport.h file.

Could you tell me where it is? How can i get that?

Meghna 2024-7-16

Hello,

Following up on this as well, how is the header supposed to look/are there any examples?

Thanks!

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Answer 2

Angelo Yeo 2024-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/2116362-how-to-create-union-in-simulink#answer_1454791

Hi @WJKIM,

Current Simulink bus does not support union. Could we get a clearer understanding of why you want to realize the Simulink.Bus object as a union in the generated code? Is there any particular use case for this request?

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WJKIM 2024-5-10

Hi.

I respond to that.

If there are many flags (for example, Fault Flags), i can save memory space by using union.

This is only my opinion.

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