Simulink signal Code generation property

Question

Suleyman 2024-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/2075706-simulink-signal-code-generation-property

评论： Brahmadev 2024-2-7

I am unable to set an exported global storage class for simulink signal under of Signal property window. In 2019, i can select from code generation under signal property but its removed from 2020b. I'm using autosar blockset and

mysignal.CoderInfo.StorageClass = 'ExportedGlobal';

or code mapping are not helping me because of the target selection. How Can i set signal as a global in AUTOSAR target 2020b

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Answer 1

Brahmadev 2024-2-6

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编辑：Brahmadev 2024-2-6

Hi @Suleyman,

As you mentioned, 'ExportedGlobal' is not present in the 'Code Mappings - Component Interface' for Signals/States Data store. Instead, you can define 'Mapped To' as 'StaticMemory' for any signal that you would want to be static in the generated code.

Also, notice in the screenshot below that the generated code allocates memory for the error signal outside the model step function.

You can refer to the following MathWorks documentation links for more information:

Configure AUTOSAR Static Memory: https://www.mathworks.com/help/autosar/ug/configure-autosar-static-memory.html
Map AUTOSAR Elements for Code Generation: https://www.mathworks.com/help/autosar/ug/map-model-elements-using-simulink-autosar-mapping-explorer.html

Hope this helps in resolving your query!

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Suleyman 2024-2-6

its look works. I wanna ask about is there any difference in using export global and static memory mapping?

Brahmadev 2024-2-7

Hi,

The following documentation page mentions, "Static memory corresponds to Simulink internal global signals."

https://www.mathworks.com/help/autosar/ug/model-autosar-component-behavior.html#bua1oyj-1:~:text=Static%20memory%20corresponds%20to%20Simulink%20internal%20global%20signals.

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Answer 2

Infinite_king 2024-2-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2075706-simulink-signal-code-generation-property#answer_1402976

Hi Suleyman,

In R2020b, you can set the storage class of a signal using the Code Mapping Editor. Follow the steps below to open the editor and set the storage class for a signal.

In the C Code Tab, select Code Interface -> Default Code Mappings.

This will open a Code Mapping Editor.
In the editor, click on Signals/States tab.
Select the signal for which you want to change the storage class.
Click the 'Add selected signals to code mappings' button. (below the Data Defaults tab)