How to use user defined class in simulink?

Hello everyone.

I have written a program in matlab(.m) that can read the sensor data. I hope to use these data in simulink(.slx).

I've defined a class ‘sensors’ that takes a long time to initialize. I hope that constructor function of 'sensors' will only be executed once when simulink start, and 'sensors.send()','sensors.read()' can be executed in each cycle of simulink.

I have tried 'Matlab Function' in simulink, error information is as follows:

Function 'udpport' not supported for code generation.

I don't really care if the simulink model could generates C/C++ code. What do I need to do to execute the constructor only once and still call the member function 'sensors.send()','sensors.read()' of class ‘sensors’ ?

My program is shown below.

Thank you for your help.

classdef ATI_sensor
    %UNTITLED Summary of this class goes here
    %   Detailed explanation goes here

    properties
        computer_IP_address,
        computer_IP_port
        ATI_IP_address,
        ATI_IP_port,
        UDP_communicate,
        cofficient = 1e7,
        header =  '123400020000000A'
    end

    methods
        
        function obj = ATI_sensor(PC_IP_address,PC_IP_port,ATI_IP,ATI_port)
            %UNTITLED Construct an instance of this class
            %   Detailed explanation goes here
            obj.computer_IP_address = PC_IP_address;
            obj.computer_IP_port = PC_IP_port;
            obj.ATI_IP_address = ATI_IP;
            obj.ATI_IP_port = ATI_port;
            obj.UDP_communicate = udpport('byte','LocalHost',obj.computer_IP_address,'LocalPort',obj.computer_IP_port,'EnablePortSharing',true,'ByteOrder','big-endian');
            obj.UDP_communicate.Timeout = 5;
            obj.UDP_communicate.EnableBroadcast = true;
        end

        
        function [] = send(obj)
            D = sscanf(obj.header,'%2x');
            flush(obj.UDP_communicate,"output");
            write(obj.UDP_communicate,D,"uint8",obj.ATI_IP_address,obj.ATI_IP_port);
           
        end
        
        function [data] = read(obj)
            obj.send();
            rawdata = read(obj.UDP_communicate,10,'int32');
            data = rawdata(4:9)/obj.cofficient;
            flush(obj.UDP_communicate,"output");
        end
        
        function [mean_data] = avg_read(obj,n)
            data_all = [];
            for i = 1:n
                obj.send();
                rawdata = read(obj.UDP_communicate,10,'int32');
                data = rawdata(4:9);
                data_all = [data_all;data];
                flush(obj.UDP_communicate,"output");
            end
            
            mean_data = mean(data_all,1)/obj.cofficient;
        end

        function [] = stop_sensor(obj)
            flush(obj.UDP_communicate,"output")
            flush(obj.UDP_communicate,'input')
            clear obj;
        end
    end
end

Answer 1

[Sarthak]

Hi lingxiao,

As per my understand, you can use a MATLAB System Block to write your own custom class for your Simulink Model and it would behave as expected.

• Add a MATLAB System Block to your model
• Double-click the block to open block parameters.
• Attach your custom class or create a new system object

Attaching a documentation link for your reference

https://www.mathworks.com/help/matlab/ref/matlab.system-class.html

[lingxiao li]

Hello Sarthak,

Thanks for your response.

I tried to use MATLAB System Block in Simulink , but the system still reported errors.The error information is as follows:

Simulink detected an error 'Function 'udpport' not supported for code generation.'. The error occurred for MATLAB System block 'untitled/MATLAB System'. See line 30, column 31 in file '.m'. The error was detected during size propagation phase. Start code generation report.

To prevent this error, use one of the following: * Modify the System object to avoid code that does not support code generation. * Implement propagation methods in the System object code. More information.

It seems 'udpport' function is unsupported in Simulink,but not user defined Class. What should I do to used 'udpport' function in simulink?

Thank you very much.