I have declared local data in stateflow mode after generating code, local data are not present in code.

I have designed one mode in state flow and then declared 3 local variable but that local data are not present in code.

Please help!

Answer 1

[Akanksha]

Hey Ankit ,

This issue likely stems from how Stateflow handles local data and code generation. Local data in Stateflow charts are typically used for temporary storage within a specific state or subcomponents and may not always be directly translated into the generated code, depending on various factors such as scope, usage, and code generation settings. Kindly check these proposed solutions:

• Check variable scope: Ensure that the local variables are properly scoped within the Stateflow chart and are being used in a way that requires code generation.
• Verify code generation settings: Review the code generation settings for the Stateflow chart to make sure that local data is included in the generated code.
• Use Data Objects: Consider using Stateflow Data Objects instead of local variables, as these are more likely to be represented in the generated code.
• Examine variable usage: Make sure the local variables are actually being used within the Stateflow chart. Unused variables may be optimized out during code generation.
• Update model and regenerate code: After making any changes, update the model and regenerate the code to see if the local variables now appear.

Please refer to the below code to help you understand the local data and its scope better :

function [output] = sf_example(input)
%#codegen

persistent localVar
if isempty(localVar)
    localVar = 0;
end

output = 0;

switch input
    case 1
        localVar = localVar + 1;
    case 2
        localVar = localVar - 1;
    otherwise
        localVar = 0;
end

output = localVar;
end

Following is the output generated when the functions are invoked with different inputs.

Please refer to the following related documentation that to help you further :

https://www.mathworks.com/help/rtw/ug/integrate-external-code-with-stateflow-charts.html

https://www.mathworks.com/help/stateflow/code-generation.htmlhttps://www.mathworks.com/help/stateflow/ug/adding-data.html

https://www.mathworks.com/help/rtw/ug/enable-and-reuse-local-block-outputs-in-generated-code.html

Hope this helps. Thanks.