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Manual Reference Pages  -  DEVICE::USB::DEVCONFIG (3)

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Device::USB::DevConfig

This class encapsulates a USB Device Configuration and the methods that object would support.

CONTENTS

NAME

Device::USB::DevConfig - Access the device configuration returned by libusb.

VERSION

Version 0.12

SYNOPSIS

Device::USB:DevConfig provides a Perl object for accessing a configuration of a USB device using the libusb library.



    use Device::USB;

    my $usb = Device::USB->new();
    my $dev = $usb->find_device( $VENDOR, $PRODUCT );

    printf "Device: %04X:%04X\n", $dev->idVendor(), $dev->idProduct();
    $dev->open();

    my $cfg = $dev->config()->[0];
    print "Config:", $cfg->iConfiguration(), ": interface count: ",
       $cfg->nNumInterfaces(), "\n";



See USB specification for an explanation of the attributes of a configuration.

DESCRIPTION

This module defines a Perl object that represents the data associated with a USB device’s configuration. The object provides read-only access to the important data associated with the configuration.

    METHODS

There are several accessor methods that return data from the configuration. Each is named after the field that they return. These accessors include:
wTotalLength Returns the total length of the data returned for this configuration.
bNumInterfaces Returns the number of interfaces supported by this configuration.
interfaces Returns a list of lists of interface objects associated with this configuration. Each of the inner lists is a set of alternate versions of that interface.
bConfigurationValue Returns the value passed to SetConfiguration to select this configuration.
iConfiguration Returns the index of the string descriptor describing this configuration. The string can be retrieved using the method Device::USB::Device::get_string_simple.
bmAttributes Returns a bitmap listing the attributes. The bits a number starting with the LSB as 0. Bit 6 is 1 if the device is self-powered. Bit 5 is 1 if the device supports Remote Wakeup.
MaxPower Returns the Maximum power consumption in mA. This value is not in units of 2mA as in the spec, but in actual mA.

DIAGNOSTICS

This is an explanation of the diagnostic and error messages this module can generate.

DEPENDENCIES

This module depends on the Carp, Inline and Inline::C modules, as well as the strict and warnings pragmas. Obviously, libusb must be available since that is the entire reason for the module’s existence.

AUTHOR

G. Wade Johnson (wade at anomaly dot org) Paul Archer (paul at paularcher dot org)

Houston Perl Mongers Group

BUGS

Please report any bugs or feature requests to bug-device-usb@rt.cpan.org, or through the web interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Device::USB>. I will be notified, and then you’ll automatically be notified of progress on your bug as I make changes.

ACKNOWLEDGEMENTS

Thanks go to various members of the Houston Perl Mongers group for input on the module. But thanks mostly go to Paul Archer who proposed the project and helped with the development.

COPYRIGHT & LICENSE

Copyright 2006 Houston Perl Mongers

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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perl v5.20.3 DEVICE::USB::DEVCONFIG (3) 2008-06-02

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