Writing S-Functions

S-Function RTWdata for Generating Code with Real-Time Workshop

There is a property of blocks called RTWdata, which can be used by the Target Language Compiler when inlining an S-function. RTWdata is a structure of strings that you can attach to a block. It is saved with the model and placed in the model.rtw file when generating code. For example, this set of MATLAB commands,

mydata.field1 = 'information for field1';
mydata.field2 = 'information for field2';
set_param(gcb,'RTWdata',mydata)
get_param(gcb,'RTWdata')

produces this result:

ans = 
 
    field1: 'information for field1'
    field2: 'information for field2'

Inside the model.rtw for the associated S-function block is this information.

Block {
  Type                    "S-Function"
  RTWdata {
    field1                  "information for field1"
    field2                  "information for field2"
  }

Fully Inlined S-Function with the mdlRTW Routine

The Direct-Index Lookup Table Algorithm