MATLAB XPC TARGET 4 - DEVICE DRIVERS Manuel d'utilisateur télécharger pdf (Page 2)

Working with xPC Target

With a host PC development environment

including MATLAB®, Simulink, Real-Time

Workshop, xPC Target, and a C compiler, you

can create Simulink models and deploy them

to target PCs, where they run as real-time

applications. You control execution of the

target PC from MATLAB, using a GUI or the

command line, a standard Internet browser,

or the target PC command line. You can

interactively control and monitor the target

application, tune model parameters, and

acquire, view, and log signal data.

High-Performance Real-Time Kernel

Using standard PC hardware and commer-

cial off-the-shelf I/O boards, xPC Target

converts a PC into a real-time rapid proto-

typing or hardware-in-the-loop system by

booting the target PC with the provided

high -performance kernel. Model sample rates

approaching 50 KHz in interrupt mode and

100 KHz in polling mode are achievable.

Communicating Between Host and

Target Systems

A single communications link connects the

host and target PCs. You design your Simulink

model on the host PC and download it over

the host-target link to the target PC, where it

executes as a real-time application. The same

communications interface is used to pass

commands, parameter updates, and signal

data between the host and target PCs. RS-232

and TCP/IP connections are supported. xPC

Target includes both an RS-232 cable and

a PCI Ethernet card for the target PC.

Accessing the Target System

There are several ways to access and com-

municate with the target system. A keyboard

and monitor connected to the target PC

provide a direct interface for issuing control

commands and status monitoring. From the

host PC, via the host-target link, you can use

the MATLAB command line or xPC Target

Explorer, a windowing GUI tool that runs

in MATLAB. xPC Target Explorer simplifies

configuration and control of the target PC.

You can even access and control multiple

target PCs running concurrently. Once you

have access to the target system, you can

perform target application control, parameter

tuning, and signal (data) acquisition.

Controlling the Target Application

Control functions let you download appli-

cations to the target PC, start and stop test

execution, and change the sample time,

stop time, and other application properties.

Statistics and metrics related to run-time per-

formance and CPU usage are also available.

You communicate with and control the

target application using an object-oriented

command-line interface in MATLAB. You

can also include the commands in M-files

for automated batch testing. xPC Target

Explorer enables you to configure, control,

and monitor operations of the target PC

in a window-based environment.

Tuning Parameters

xPC Target includes several methods for

tuning application parameters. After down-

loading the application to the target PC, you

can use the command-line interface or xPC

Target Explorer to modify parameter values

before, during, or after real-time execution.

You can also use Simulink external mode for

parameter tuning. In this mode, the Simulink

model running on the host PC operates as

a GUI to the target application. When you

change a parameter in your Simulink model,

the parameter value is automatically down-

loaded to the target PC and updated in the

target application.

Monitoring and Acquiring Signals

With xPC Target, you can monitor, trace,

and log signal data while the application

is running. Signal monitoring is an instan-

taneous view of signal values at the current

sample time. Signal tracing lets you capture,

store, and display bursts of data, similar to

the behavior of a digital oscilloscope. Use

signal logging to acquire signals during the

entire test execution. Options are available

to log data to the target PC memory or file

system. The acquired data can be uploaded

to the host PC during the test, or upon com-

pletion, for display, analysis, or archiving.

DC motor model (above), created with Simulink and converted to a real-time applica-

tion that runs on the target PC with the display (right) showing the real-time signals.

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