Device::USB::DevInterface(3pm)				User Contributed Perl Documentation			    Device::USB::DevInterface(3pm)

Device::USB::DevInterface
       This class encapsulates a USB Device Interface and the methods that object would support.

NAME

       Device::USB::DevInterface - Access a device interface returned by libusb.

VERSION

       Version 0.11

SYNOPSIS

       Device::USB:DevInterface provides a Perl object for accessing an interface of 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
", $dev->idVendor(), $dev->idProduct();
	   $dev->open();

	   my $cfg = $dev->config()->[0];
	   my $inter = $cfg->interfaces()->[0];
	   print "Interface:", $inter->bInterfaceNumber(),
	      " name: ", $dev->get_string_simple($iter->iInterface()),
	      ": endpoint count: ", $inter->nNumEndpoints(), "
";

       See USB specification for an explanation of the attributes of an interface.

DESCRIPTION

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

   METHODS
       There are several accessor methods that return data from the interface.	Each is named after the field that they return. These accessors
       include:

       bInterfaceNumber
	   The 0-based number of this interface.

       bAlternateSetting
	   Value used to select this alternate setting for the interface specified in bInterfaceNumber.

       bNumEndpoints
	   Number of endpoints (excluding endpoint 0) available on this interface.  If the value  is 0, only the control interface is supported.

       bInterfaceClass
	   Class code as specified by the USB-IF. A value of 0xff is a vendor-specific interface class.

       bInterfaceSubClass
	   Subclass code specified by the USB-IF. If bInterfaceClass is not 0xff, this field must use only subclasses specified by the USB-IF.

       bInterfaceProtocol
	   The InterfaceProtocol as specified by the USB-IF. A value of 0xff uses a vendor-specific protocol.

       iInterface
	   Returns the index of the string descriptor describing this interface.  The string can be retrieved using the method
	   "Device::USB::Device::get_string_simple".

       endpoints
	   Returns a list of endpoint objects associated with this interface.

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.

perl v5.14.2							    2008-06-02					    Device::USB::DevInterface(3pm)