NAME

Device::USB - Use libusb to access USB devices.

VERSION

Version 0.14

SYNOPSIS

Device::USB provides a Perl wrapper around the libusb library. This supports Perl code controlling and accessing USB devices.

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();
print "Manufactured by ", $dev->manufacturer(), "\n",
      " Product: ", $dev->product(), "\n";

$dev->set_configuration( $CFG );
$dev->control_msg( @params );
...

See the libusb manual for more information about most of the methods. The functionality is generally the same as the libusb function whose name is the method name prepended with "usb_".

DESCRIPTION

This module provides a Perl interface to the C library libusb. This library supports a relatively full set of functionality to access a USB device. In addition to the libusb, functioality, Device::USB provides a few convenience features that are intended to produce a more Perl-ish interface.

These features include:

• Using the library initializes it, no need to call the underlying usb_init function.

• Object interface reduces namespace pollution and provides a better interface to the library.

• The find_device method finds the device associated with a vendor id and product id and creates an appropriate Device::USB::Device object to manipulate the USB device.

• Object interfaces to the bus and device data structures allowing read access to information about each.

Device::USB

This class provides an interface to the non-bus and non-device specific functions of the libusb library. In particular, it provides interfaces to find busses and devices. It also provides convenience methods that simplify some of the tasks above.

FUNCTIONS

new

Create a new Device::USB object for accessing the library.

debug_mode

This class method enables low-level debugging messages from the library interface code.

A true argument enables debug mode, a false argument disables it.

find_busses

Returns the number of changes since previous call to the function: the number of busses added or removed.

find_devices

Returns the number of changes since previous call to the function: the number of devices added or removed. Should be called after find_busses.

find_device

Find and a particular USB device based on the vendor and product ids. If more than one device has the same product id from the same vendor, the fist one found will be returned.

vendor

the vendor id

product

product id for that vendor

returns a device reference or undef if none was found.

list_devices

Find all devices matching a vendor id and optional product id. If no product id is given, returns all devices found with the supplied vendor id. If a product id is given, returns all devices matching both the vendor id and product id.

vendor

the vendor id

product

optional product id for that vendor

returns a list of devices matching the supplied criteria or a reference to that array in scalar context

list_busses

Return the complete list of information after finding busses and devices.

By using this function, you do not need to do the find_* calls yourself.

returns a reference to an array of busses.

get_busses

Return the complete list of information after finding busses and devices.

Before calling this function, remember to call find_busses and find_devices.

returns a reference to an array of busses.

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

Original author: David Davis

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.

LIMITATIONS

So far, this module has only been tested on Linux. It should work on any OS that supports the libusb library. Several people have reported problems compiling the module on Windows.

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.

Thanks to Josep Monés Teixidor for fixing the \bInterfaceClass bug.

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.

cpanm Device::USB

perl -MCPAN -e shell
install Device::USB