User`s guide

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)