MATLAB: How to set data in a Stateflow Chart to use AUTOSAR Per Instance Memory Code Mapping

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I want to set some data to be Code Mapped to AUTOSAR Per Instance Memory. This data lives inside a Stateflow Chart, but I cannot access the Code Mappings Editor directly from the Stateflow Chart. How can I set chart data to use these Code Mappings?

Best Answer

While you cannot directly access the Code Mappings Editor from within the Stateflow Chart, you can use a Data Store Memory block in Simulink:

Set the name of the Data Store Memory to be that of the data inside the Stateflow Chart that you want to map. Then, in the Code Perspective pane, they can map the Data Store to "ArTypedPerInstanceMemory".

For more information, check this link:

https://www.mathworks.com/help/autosar/ug/use-data-store-memory-blocks-to-specify-per-instance-memory.html

Related Solutions

MATLAB: Can I access Stateflow chart data in Simulink Functions without passing it as an input to the Simulink function

Typically no, because Simulink Functions are an independent entity inside the Stateflow chart.

However, Simulink Functions can access data with scope Data Store Memory.

1. Using the Symbols pane (View > Symbols) and the Property Inspector (View > Property Inspector), set the scope of the variable you want to access from Stateflow chart as Data Store Memory.

2. Add a Data Store Memory block to the Simulink model that parents the chart.

3. Add a Data Store Read block in the Simulink function inside the chart to read this data.

For more information, see the following documentation:

https://www.mathworks.com/help/releases/R2016b/stateflow/global-data.html

MATLAB: Is there a function in Stateflow to determine how a particular “Data Store Memory” data object is being used by a Stateflow chart

The ability to determine how a particular "Data Store Memory" data object is used in a Stateflow chart is not available in Stateflow.

To work around this issue, you can write your own MATLAB file function that uses the Stateflow API to obtain the expressions in a transition, state, or other chart object that indicate how the "Data Store Memory" is being used. As an example, you might use the following commands in the Stateflow API to access expressions in a transition and state:

rt = sfroot;
m = rt.find('-isa', 'Simulink.BlockDiagram', '-and', 'Name','myModel');
chart = m.find('-isa','Stateflow.Chart','-and','Name','mychart');
trans = find(chart, '-isa','Stateflow.Transition'); %Get all transitions
states = find(chart, '-isa','Stateflow.State'); %Get all states
transString = trans(1).LabelString; %Get the expressions in the first transition
statesString = states(1).LabelString; %Get the expressions in the first state

One way to determine if the "Data Store Memory" data object is being read from or written to is to see if it is on the right or left side of an "=" sign. You can determine this by parsing the transString and statesString strings. You can also use the STRFIND command to get the location of the "Data Store Memory" variable and the "=" sign in the expressions contained in transString and statesString strings.

Best Answer

Related Solutions

MATLAB: Can I access Stateflow chart data in Simulink Functions without passing it as an input to the Simulink function

MATLAB: Is there a function in Stateflow to determine how a particular “Data Store Memory” data object is being used by a Stateflow chart

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