Retrieve child coverage results from parent model

I am using the coverage toolbox, MATLAB 2018a, these are my settings to get the coverage from a model:

load_system( 'my_model' );
set_param( 'my_model', ...
    'CovEnable'        , 'on', ...
    'CovMetricSettings', 'dcmetr', ...
    'RecordCoverage'   , 'on' );

I am turning on signal range and table coverage results.

I run and I get the coverage, then when I try to see the signal ranges I use this:

[minVal, maxVal] = sigrangeinfo(cumCovData, 'my_model/subsystem', 1 )

And I can see the max-min values for a specific subsystem, my problem is that I can only see the max-min values for the subsystems at the very bottom level of the model. Now, if I want to see this max-min values in the parent model, e.g.:

[minVal, maxVal] = sigrangeinfo(cumCovData, 'my_model', 1 )

I get this:

minVal =

     []


maxVal =

     []

So, it looks like MATLAB/SIMULINK cannot assign the low level range outputs to the parent model.

So my question is:

Can I assign max-min ranges from coverage data to the parent model? What's the setting for this operation?

Answer 1

[Pat Canny]

Hi Luis,

Thanks for your question.

You are correct in that the signal range coverage is not collected for model outputs. The object needs to have a valid handle, and model outputs don't qualify. This is why you are seeing the discrepancy between the subsystem and the model. This is a good bit of feedback for the team.

One suggestion is to try creating a test harness (which would use a model reference hierarchy) and collecting the range coverage on the harness model. This is a workaround solution, but it would treat the harness as a block and allow you to collect range coverage for the "block" outputs. I suggest using slvnvmakeharness to create a harness.

[Luis Ruiz]

Thanks for the feedback!

It would be good to add some functionality to these coverage tools. Because, also when checking the coverage for S Functions I have a similar problem. The data is shown in the html generated output but from command line I cannot see the results of a specific function iside the C code, eg.

[coverage, description] = mcdcinfo(cumCovData, 'my_model/subsystem/S-Function/file.c/my_function' )

I know the data is in the cumCoVData variable because I can see it in the html output, and I can dig inside description and see it, so I think it is possible to get detailed data from the command line.

Thanks!!