Writing S-Functions

ssWriteRTWParameters

Write tunable parameter information to the model.rtw file.

Syntax

• int_T ssWriteRTWParameters(SimStruct *S,  int_T nParams, int_T 
  paramType, const char_T *paramName, const char_T *stringInfo, 
  ...)
  

Arguments

S
   SimStruct representing an S-Function block.

nParams
   Number of tunable parameters.

paramType
   Type of parameter (see Parameter Type-Specific Arguments).

paramName
   Name of the parameter.

stringInfo
   General information about the parameter, such as how it was derived.

...
   Remaining arguments depend on the parameter type (see Parameter Type-Specific Arguments).

Description

Use this function in mdlRTW to write tunable parameter information to this S-function's model.rtw file. Your S-function must write the parameters out in the same order as they are declared at the beginning of the S-function. This function returns true if successful.

Note    This function is provided for compatibility with S-functions that do not use run-time parameters. It is suggested that you use run-time parameters (see Run-Time Parameters). If you do use run-time parameters, you do not need to use this function.

Parameter Type-Specific Arguments

This section lists the parameter-specific arguments required by each parameter type.

• SS_WRITE_VALUE_VECT (vector parameter
  
  

  Argument	Description
  const real_T *valueVect	Pointer to an array of vector values
  int_T vectLen	Length of the vector

  )
• SSWRITE_VALUE_2DMAT (matrix parameter)
  
  

  Argument	Description
  const real_T *valueMat	Pointer to an array of matrix elements
  int_T nRows	Number of rows in the matrix
  int_T nCols	Number of columns in the matrix

• SSWRITE_VALUE_DTYPE_2DMAT
  
  

  Argument	Description
  const real_T *valueMat	Pointer to an array of matrix elements
  int_T nRows	Number of rows in the matrix
  int_T nCols	Number of columns in the matrix
  int_T dtInfo	Data type of matrix elements (see Specifying Data Type Info)

• SSWRITE_VALUE_DTYPE_ML_VECT
  
  

  Argument	Description
  const void *rValueVect	Real component of the complex vector
  const void *iValueVect	Imaginary component of the complex vector
  int_T vectLen	Length of the vector
  int_T dtInfo	Data type of the vector (see Specifying Data Type Info)

• SSWRITE_VALUE_DTYPE_ML_2DMAT
  
  

  Argument	Description
  const void *rValueMat	Real component of the complex matrix
  const void *iValueMat	Imaginary component of the complex matrix
  int_T nRows	Number of rows in the matrix
  int_T nCols	Number of columns in the matrix
  int_T dtInfo	Data type of matrix

Specifying Data Type Info

You obtain the data type of the value argument passed to the ssWriteRTW macros using

• DTINFO(dTypeId, isComplex)
  

where dTypeId can be any one of the enum values in BuiltInDTypeID (SS_DOUBLE, SS_SINGLE, SS_INT8, SS_UINT8, SS_INT16, SS_UINT16, SS_INT32, SS_UINT32, SS_BOOLEAN) defined in simstuc_types.h. The isComplex argument is either 0 or 1.

For example, DTINFO(SS_INT32,0) is a noncomplex 32-bit signed integer.

If isComplex==1, the array of values is assumed to have the real and imaginary parts arranged in an interleaved manner (i.e., Simulink format). If you prefer to pass the real and imaginary parts as two separate arrays, you should use the macro ssWriteRTWMxVectParam or ssWriteRTWMx2dMatParam.

Example

See simulink/src/sfun_multiport.c for an example that uses this function.

Languages

C

See Also
mdlRTW

ssWriteRTWMxVectParam

ssWriteRTWParamSettings