Device...Config(3pm)

📦
version 0.38 · 6 versions
, in ubuntu stonking

💖 Device::USB::DevConfig 💖

okay bestie, gather round, because we're talking about a Perl module from the User Contributed Perl Documentation corner of manual section 3pm, and honestly? it's giving ✨low-level USB energy✨ in the best way.

🌸 NAME 🌸

Device::USB::DevConfig — access the device configuration returned by libusb.

This class encapsulates a USB Device Configuration and all the methods that object would support. no cap. 🦋

⭐ VERSION ⭐

Version 0.38, babes. that's the one. 💅

✨ SYNOPSIS ✨

so Device::USB:DevConfig (yes, that's how it's written, we don't question the colon situation) hands you a Perl object for accessing a configuration of a USB device using the libusb library. here's the whole vibe:

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";

and if you're sitting there like "what do these attributes even mean" — go read the USB specification, bestie. that's literally where the explanation lives. 📖

🎀 DESCRIPTION 🎀

This module defines a Perl object that represents the data associated with a USB device's configuration. The object gives you read-only access to the important data hanging off that configuration. like, look but don't touch, she's not yours. 🙈

🫶 METHODS

There are several accessor methods that return data from the configuration, and each one is named after the field it returns. the dedication?? immaculate. here's the full roster:

  • wTotalLength — returns the total length of the data returned for this configuration. the whole package. 💖
  • 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. nested lists?? very main character. 👑
  • bConfigurationValue — returns the value passed to SetConfiguration to select this configuration.
  • iConfiguration — returns the index of the string descriptor describing this configuration. you can grab that string with the method Device::USB::Device::get_string_simple. iykyk. 💅
  • bmAttributes — returns a bitmap listing the attributes, with bit numbers starting at the LSB as 0. Bit 6 is 1 if the device is self-powered. Bit 5 is 1 if the device supports Remote Wakeup. two very important little guys. ⭐
  • MaxPower — returns the maximum power consumption in mA. and listen, heads up: this value is not in units of 2mA like in the spec, it's in actual mA. so don't go doubling anything, bestie. 🔥

💀 DIAGNOSTICS 💀

This is an explanation of the diagnostic and error messages this module can generate. so when something goes sideways, this is where the lore lives. 😭

🌈 DEPENDENCIES 🌈

This module depends on the Carp, Inline and Inline::C modules, plus the strict and warnings pragmas. and obviously, libusb must be available, because honestly that is the entire reason for the module's existence. no libusb, no module, no us. periodt. 💜

🌸 AUTHOR 🌸

  • G. Wade Johnson (gwadej at cpan 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. literal group-chat update energy, we love to see it. 💌

✨ 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. king behaviour, honestly. 👑

Copyright 2006-2013 Houston Perl Mongers

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

and that's the whole page, bestie!! you ate that. 💅✨

perl v5.42.3 · 2026-08-19 · Device...Config(3pm) — bye pookie, go read your USB specs 🦋🎀💜

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