Specify the direct feedthrough status of a block's ports
void ssSetInputPortDirectFeedThrough(SimStruct *S, int_T port, int_T dirFeed)
SimStruct representing an S-Function block.
Index of the input port whose direct feedthrough property is being set.
Direct feedthrough status of the block specified by
ssSetNumInputPorts) to specify the direct feedthrough (0 or 1)
for each input port index. If not specified, the default direct feedthrough is 0.
Setting direct feedthrough to 0 for an input port is equivalent to saying that the
corresponding input port signal is not used in
mdlGetTimeOfNextVarHit. If it is used, you might or might not
see a delay of one simulation step in the input signal. This might cause the
simulation solver to issue an error due to simulation inconsistencies.
ssSetInputPortDirectFeedThrough macro becomes a
function when you compile your S-function in debug mode (