why do i get Error in 'untitled1/DDE Source/S-Function' while executing MATLAB S-function 'sfunddi', flag = 0 (initialize), at start of simulation. Caused by: DDE initialization failed.
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function [sys,x0,str,ts] = sfunddi(t,x,u,flag,service,topic,item) %SFUNDDI Simulink DDE source.
switch flag
case 0;
[sys,x0,str,ts]=mdlInitializeSizes(service,topic);
case 2;
sys = mdlUpdate(t,x,u);
case 3;
sys = mdlOutputs(t,x,u,item);
case 9;
sys = mdlTerminate(t,x,u);
otherwise;
sys=[];
end
function [sys,x0,str,ts]=mdlInitializeSizes(service,topic)
sizes = simsizes;
sizes.NumContStates = 0; sizes.NumDiscStates = 1; sizes.NumOutputs = 1; sizes.NumInputs = 0; sizes.DirFeedthrough = 0; sizes.NumSampleTimes = 1;
sys = simsizes(sizes);
str = []; ts = [-1 0]; % Inherited sample time
x0 = ddeinit(service,topic); if (x0==0) error('DDE initialization failed.'); end;
function sys = mdlUpdate(t,x,u)
sys = x;
function sys = mdlOutputs(t,x,u,item)
sys = ddereq(x, item);
function sys = mdlTerminate(t,x,u)
ddeterm(x); sys = [];
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