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

MATLAB

I want to add a stateflow constant data by API. Is it possible?
I am doing SIL testing and would like to modify some constant data through the stateflow API.

Best Answer

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
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