User`s guide

Open Architecture of the Real-Time Workshop

1-17

A First Look at Real-Time Workshop Files

An example of a Simulink model is this block diagram:

Figure 1-4: A Simple Simulink Model

This model is saved in a file called example.mdl. Generating C code from

example.mdl is done by using the Real-Time Workshop user interface for

generating code and executables. The next chapter, “Getting Started with the

Real-Time Workshop,” explains the details of the user interface.

Later in this section are excerpts from the associated

.rtw files that the

Real-Time Workshop uses to generate the real-time version of this model in C.

Basic Features of example.rtw

When you invoke the Real-Time Workshop build procedure to generate code, it

first compiles your model. This compilation process consists of these tasks:

• Evaluating simulation and block parameters

• Propagating signal width and sample times

• Computing work vector sizes such as those used by S-functions (for more

information about work vectors, refer to the Simulink documentation)

• Determining the execution order of blocks within the model

The Real-Time Workshop writes this information out to

example.rtw.The

example.rtw file is an ASCII file consisting of parameter value pairs stored in

a hierarchical structure consisting of records. Below is an excerpt from

Out

Sine Wave

Gain

sin_out gain_out