How to generate code for model which uses an export-function reference model?

I am using Matlab R2024a prerelease version to build a stateflow chart that generates function call to call the export-function submodel.

I can generate code for the reference model as well as run simulation of the top model. But generating code for the top model gives this error message:

Model 'MainComponent', which is not an Export Function model, may not generate code because it contains a reference model 'SubComponent' that is set up as a multi-instance Export Function. Consider setting the 'Total number of instances allowed per top model' model configuration parameter from 'SubComponent' to 'One' or ensure that the model 'MainComponent' is an Export Function model.

How can I generate code for the top model?

[Sebastian Lucaci]

This is a very good question that I have seen was also asked by other people in the past (2019). Since Matlab has evolved a lot in the last 5 years, if there is a solution, me and my team would also be interested to find it out.

Thank you in advance!

[Fangjun Jiang]

Are you open to, and did you try one of those two options?

1. Set the 'Total number of instances allowed per top model' model configuration parameter for 'SubComponent' to 'One'

2. Make the model 'MainComponent' an Export Function model

[Cornelia Costea]

Hello Fangjun Jiang,

Thank you for your answer but I have already tried this two options.

1. Code interface packaging for 'MainComponent' is set as reusable function so I can't set the 'Total number of instances allowed per top model' for 'SubComponent' to 'One'.
2. The 'MainComponent' is set as Export Function model.

[Fangjun Jiang]

Okay, if you've done 2 then what is the new error message.

[Cornelia Costea]

The 'MainComponent' was already set as export function model when I got the error mentioned above.

[Fangjun Jiang]

The error message indicates the contrary. Make sure you've gone through this and confirm there is a "f()" icon at the low left corner of the root level of 'MainComponent'.

https://www.mathworks.com/help/simulink/ug/create-export-function-model.html

[Cornelia Costea]

There is a f() icon at the low left corner of 'MainComponent'. If I use system target file ert.tlc I am able to generate code, but I need to use autosar.tlc.

[Anamaria Popa]

Hello,

I am using MATLAB 2023a and I also have the same problem when trying to generate code using system target file autosar.tlc:

Is there any solution for this?

[Fangjun Jiang]

Contact the Mathworks tech support with your example model to see if this is a bug, or there are more settings need to be done for autosar.tlc.

Answer 1

[Akshat Dalal]

Hi Cornelia,

I believe the error you're getting is a documented limitation mentioned here - https://in.mathworks.com/help/rtw/ug/code-generation-limitations-for-model-reference.html

It is a limitation specific to code generation for model references. As mentioned, if the model uses exported Stateflow graphical functions, you need to set the 'Total number of instances allowed per top model' parameter to 'one'. But you already mentioned you cannot do that, so you might need to contact MathWorks Technical Support to see if there's any workaround.

It is also mentioned that "If you generate code for an atomic subsystem as a reusable function, inputs or outputs that connect the subsystem to a referenced model might prevent code reuse, as described in Generate Reentrant Code from Subsystems.". I am not sure if it applies to your case, but you might want to have a look at this too.

I hope this helps in figuring out the issue.