MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Uživatelská příručka stáhnout pdf (Strana 163)

Converting Level 1 C MEX S-Functions to Level 2

3-119

• If your S -function has a nonempty mdlInitializeConditions, then update

it to the following form

#define MDL_INITIALIZE_CONDITIONS

static void mdlInitializeConditions(SimStruct *S)

{

}

otherwise, delete the function.

- The continuous states are accessed using

ssGetContStates.ThessGetX

macro has been removed.

- The discrete states are accessed using

ssGetRealDiscStates(S).The

ssGetX macro has been removed.

- For mixed continuous and discrete state S-functions, the state vector no

longer consists of thecontinuousstatesfollowedby thediscretestates.The

states are saved in separate vectors and hence may not be contiguous in

memory.

• The

mdlOutputs prototype has changed from

static void mdlOutputs( real_T *y, const real_T *x,

const real_T *u, SimStruct *S, int_T tid)

to:

static void mdlOutputs(SimStruct *S, int_T tid)

Since y, x,anduare not explicitly passed into Level-2 S-functions, you must

use:

ssGetInputPortRealSignalPtrs to access inputs.

ssGetOutputPortSignal to access the outputs.

ssGetContStates or ssGetRealDiscStates to access the states.

• The

mdlUpdate function prototype has been changed from

void mdlUpdate(real_T *x, real_T *u, Simstruct *S, int_T tid)

to:

void mdlUpdate(SimStruct *S, int_T tid)

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Uživatelská příručka Strana 163