Hello all,

I am rather new to MATLAB, and therefore a little unfamiliar with the app designer, apologies in advance.
I am trying to write a code that tracks the position of a stepper motor over serial communication. Currently, I have the setup such that it will callback the readSerialData Function everytime the terminator "CR" is reached.
Ideally I would like to access the value read. I wanted to save this value to the motorPos property of the app for use in separate functions later down the line. However, from tests, it seems that the value of app.motorPos does not update and remains the initial value of 0, as defined in the startup function. While it does display the correct value in the command window (from the disp(app.arduino) function), the value of the property app.arduino seem to remain 0, when called upon in later functions.
How should I go about updating the value of property motorPos?

Thanks,
Yuandi Wu
properties (Access = public)
arduino
motorPos
end

methods (Access = private)

function readSerialData(app,src)
app.motorPos = readline(src);
disp(app.motorPos);
end
end

% Callbacks that handle component events
methods (Access = private)

% Code that executes after component creation
function startupFcn(app)

delete(instrfindall);
app.arduino = serialport ("COM3", 9600, "Timeout", 0.1);
app.arduino.DataBits = 8;
configureTerminator(app.arduino,"CR")
configureCallback(app.arduino,"terminator",@readSerialData)

%initially, upon startup, display these values
app.motorPos = ‘0’;
disp(app.motorPos)

endHello all,

I am rather new to MATLAB, and therefore a little unfamiliar with the app designer, apologies in advance.
I am trying to write a code that tracks the position of a stepper motor over serial communication. Currently, I have the setup such that it will callback the readSerialData Function everytime the terminator "CR" is reached.
Ideally I would like to access the value read. I wanted to save this value to the motorPos property of the app for use in separate functions later down the line. However, from tests, it seems that the value of app.motorPos does not update and remains the initial value of 0, as defined in the startup function. While it does display the correct value in the command window (from the disp(app.arduino) function), the value of the property app.arduino seem to remain 0, when called upon in later functions.
How should I go about updating the value of property motorPos?

Thanks,
Yuandi Wu
properties (Access = public)
arduino
motorPos
end

methods (Access = private)

function readSerialData(app,src)
app.motorPos = readline(src);
disp(app.motorPos);
end
end

% Callbacks that handle component events
methods (Access = private)

% Code that executes after component creation
function startupFcn(app)

delete(instrfindall);
app.arduino = serialport ("COM3", 9600, "Timeout", 0.1);
app.arduino.DataBits = 8;
configureTerminator(app.arduino,"CR")
configureCallback(app.arduino,"terminator",@readSerialData)

%initially, upon startup, display these values
app.motorPos = ‘0’;
disp(app.motorPos)

end Hello all,

I am rather new to MATLAB, and therefore a little unfamiliar with the app designer, apologies in advance.
I am trying to write a code that tracks the position of a stepper motor over serial communication. Currently, I have the setup such that it will callback the readSerialData Function everytime the terminator "CR" is reached.
Ideally I would like to access the value read. I wanted to save this value to the motorPos property of the app for use in separate functions later down the line. However, from tests, it seems that the value of app.motorPos does not update and remains the initial value of 0, as defined in the startup function. While it does display the correct value in the command window (from the disp(app.arduino) function), the value of the property app.arduino seem to remain 0, when called upon in later functions.
How should I go about updating the value of property motorPos?

Thanks,
Yuandi Wu
properties (Access = public)
arduino
motorPos
end

methods (Access = private)

function readSerialData(app,src)
app.motorPos = readline(src);
disp(app.motorPos);
end
end

% Callbacks that handle component events
methods (Access = private)

% Code that executes after component creation
function startupFcn(app)

delete(instrfindall);
app.arduino = serialport ("COM3", 9600, "Timeout", 0.1);
app.arduino.DataBits = 8;
configureTerminator(app.arduino,"CR")
configureCallback(app.arduino,"terminator",@readSerialData)

%initially, upon startup, display these values
app.motorPos = ‘0’;
disp(app.motorPos)

end appdesigner, serial MATLAB Answers — New Questions

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