MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Scaricare il pdf (Pagina 44)

2 Writing S-Functions As M-Files

2-20

function sys = mdlOutputs(t,x,u)

sys = x(1);

% end mdlOutputs

%==============================================================

% mdlGetTimeOfNextVarHit

% Return the time of the next hit for this block. Note that the

% result is absolute time.

%==============================================================

function sys = mdlGetTimeOfNextVarHit(t,x,u)

sys = t + u(2);

% End of mdlGetTimeOfNextVarHit.

mdlGetTimeOfNextVarHit

returns the “time of the next hit,” the time in the

simulationwhen

vsfunc isnext called. Thismeans that thereis no outputfrom

this S-function until the time of the next hit . In

vsfunc, the time of the next hit

is set to

t + u(2), whichmeans that the secondinput, u(2), sets thetime when

the next call to

vsfunc occurs.

Passing Additional Parameters

Simulink always passes t, x, u,andflag into S-functions. It is poss ible t o pass

additional parameters into yo ur M-file S-function . For an examp le of how to d o

this, se e

limintm.m in the toolbox/simulink/blocks directory.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Pagina 44