Writing S-Functions

ssSetInputPortDirectFeedThrough

Specify the direct feedthrough status of a block's ports.

C Syntax

void ssSetInputPortDirectFeedThrough(SimStruct *S, int_T port, 
int_T dirFeed)

Ada Syntax

procedure ssSetInputPortDirectFeedThrough(S : in SimStruct; port : 
in Integer := 0; dirFeed : in Boolean);

Arguments
S
   SimStruct representing an S-function block or a Simulink model.

dirFeed

Direct feedthrough status of block specified by inputPortIdx.

Description

Use in mdlInitializeSizes (after 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 mdlOutputs or mdlGetTimeOfNextVarHit. If it is used, you may or may not see a delay of one simulation step in the input signal. This may cause the simulation solver to issue an error due to simulation inconsistencies.

Languages

Ada, C

See Also
ssSetInputPorts

ssSetInputPortFrameData

ssSetInputPortMatrixDimensions