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

accesssimulinkstateflow

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

Best Answer

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

Related Solutions

MATLAB: How to add data in stateflow by using the API

Yes! It is possible.

Please go through the code below to have a better understanding of the commands.

% This script demonstrates simple example of using the statefloew API.
% For more details about the stateflow commands please go through the
% documentaion online
clear;
bdclose('all'); % Close all models
clc;
%%First create a new model 
sfnew; % Creates a new model with a new stateflow chart in it
%%Access the model object created
rt = sfroot;
m = rt.find('-isa','Simulink.BlockDiagram');
%%Access the stateflow object in the model
ch = m.find('-isa','Stateflow.Chart');
% Create new states A and B in stateflow
state_A = Stateflow.State(ch);
state_A.Name = 'A';
state_A.Position = [80 120 90 60];
state_B = Stateflow.State(ch);
state_B.Name = 'B';
state_B.Position = [240 120 90 60];
% Create a transition
trans_A2B = Stateflow.Transition(ch);
trans_A2B.Source = state_A;
trans_A2B.Destination = state_B;
trans_A2B.SourceOClock = 3;
trans_A2B.DestinationOClock = 9;
% Add a default transition to state A
default2A = Stateflow.Transition(ch);
default2A.Destination = state_A;
default2A.DestinationOClock = 0;
%%Add input/output and parameters and constants to the chart
% Add an input in1
data_in = Stateflow.Data(ch);
data_in.Scope = 'Input';
data_in.Name = 'in1';
% Add an output out1
data_out = Stateflow.Data(ch);
data_out.Scope = 'Output';
data_out.Name = 'out1';
% Add a constant Param1
data_param = Stateflow.Data(ch);
data_param.Scope = 'Parameter';
data_param.Name = 'Param1';
% Add a constant Const1
data_const = Stateflow.Data(ch);
data_const.Scope = 'Constant';
data_const.Name = 'Const1';
data_const.Props.InitialValue = '17';       % => Change the constant initial value here
% Open the stateflow chart for view
ch.view;
%%Save the model with any name you want
sfsave;

Also, some type of variables like the constant type can only be set before the simulation starts. If you are trying to dynamically change the read-only variables during the simulation for the SIL then, you might get an error. Please see relevant documentation linked below for read-only variable types:

Manage Data::

https://www.mathworks.com/help/releases/R2019a/stateflow/ug/use-the-symbols-window-with-stateflow-data-events-and-messages.html#bvfv6_u-1

Set Data Properties:

https://www.mathworks.com/help/releases/R2019a/stateflow/ug/set-data-properties-1.html#bqlgn92

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

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

Best Answer

Related Solutions

MATLAB: How to add data in stateflow by using the API

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

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