Learn more about Simulink

ssGetOutputPortSignal - Get the vector of signal elements emitted by an output port

Syntax

void *ssGetOutputPortSignal(SimStruct *S, int_T port)

Arguments

S: SimStruct representing an S-Function block.
port: Index of an output port.

Returns

A pointer (void *) to the vector of signal elements output at the port specified by the index port.

Description

Use in any simulation loop routine, mdlInitializeConditions, or mdlStart to obtain a vector of signal elements emitted by an output port.

Note You cannot use ssGetOutputPortSignal anywhere except in mdlOutputs if you have specified that the output ports are reusable using ssSetOutputPortOptimOpts. For example, if the outputs have been specified as reusable with the SS_REUSABLE_AND_LOCAL flag, the mdlUpdate routine errors out when it tries to access output memory that is unavailable.

Note If the port outputs a signal of type double (real_T), use ssGetOutputPortRealSignal to get the signal vector and avoid the need to type cast the output of ssGetOutputPortSignal.

Languages

C, C++

Example

Assume that the output port data types are int16_T.

  nOutputPorts = ssGetNumOutputPorts(S);
  for (i = 0; i < nOutputPorts; i++) {
   	int16_T *y      = (int16_T *)ssGetOutputPortSignal(S,i);
	   int_T   ny      = ssGetOutputPortWidth(S,i);
 	  for (j = 0; j < ny; j++) {
  		SomeFunctionToFillInOutput(y[j]);
  	}
  }

See the S-function matlabroot/simulink/src/sfun_port_constant.c used in sfcndemo_port_constant.mdl for a complete example that uses this function.