User`s guide

2 Getting Started with the Real-Time Workshop

2-10

the Real-Time Workshop page. Finally, if the host on which you are running

matches the

HOST macro specified in the template makefile, make is invoked to

create a program from the generated code. See Chapter 3, “Code Generation

and the Build Process,” for more information on the build process.

Template Makefiles

The Real-Time Workshop uses template makefiles to build an executable from

the generated code. By convention, a template makefile has an extension of

.tmf and a name corresponding to your target. For example grt_unix.tmf is

the generic real-time template makefile for UNIX.

A makefile is created from the template makefile by copying each line from the

template makefile, expanding tokens into the makefile. See “Template

Makefiles” on page 3-23 for more information about template makefiles and

expandable tokens. The name of the makefile created is

model.mk.The

model.mk file is then passed to a make utility, which is a utility that builds an

executable from a set of files. The

make utility performs date checking on the

dependencies between the object and C files and rebuilds the object files if

needed.

Template Makefile Configuration

You can configure the build process by modifying the template makefile. You

can do this by copying it to your local working directory and editing it.

Alternatively, you can configure the template makefile’s operation, by

specifying build options to the

make_rtw command.

For example, in the Real-Time Workshop page of the Simulation

Parameters dialog box, you can turn debugging symbols on for the

grt_unix.tmf by specifying the build command as:

make_rtw OPT_OPTS=−g

The comment section of the template makefiles distributed by The MathWorks

includes some helpful hints about common build options.

Specifying Model Parameters

You modify the model parameters that control aspects of the simulation, such

as start and stop time, by altering the fields of the Simulation Parameters

dialog box. The simulation parameters are used directly for code generation