The usb package

[Tags: bsd3, library]

This library enables you to communicate with USB devices from userspace. It is implemented as a high-level wrapper around bindings-libusb which is a low-level binding to the C library: libusb-1.*.

The USB transfer functions in this library have a simple synchronous interface (they block) but are implemented using the libusb asynchronous interface. They integrate with the GHC event manager making them efficient (no busy-loops) and interruptible (throwing an exception to the thread executing a transfer immediately cancels the transfer).

If the GHC event manager is not available (because you're either not using GHC or because you're on Windows) the library degrades gracefully to the libusb synchronous implementation.

This documentation assumes knowledge of how to operate USB devices from a software standpoint (descriptors, configurations, interfaces, endpoints, control/bulk/interrupt/isochronous transfers, etc). Full information can be found in the USB 2.0 specification.

For an example how to use this library see the usb-example package or the ls-usb package.

Also see the usb-safe package which wraps this package and provides some strong safety guarantees for working with USB devices.

Finally have a look at the usb-iteratee package which provides iteratee enumerators for enumerating bulk, interrupt and isochronous endpoints:

Besides this API documentation the following sources might be interesting:


Versions0.1,, 0.2,, 0.3,, 0.3.1, 0.4, 0.5,, 0.6,,,,,,,,, 0.7, 0.8, 1.0, 1.1,,,,, 1.2,
Dependenciesbase (>=4 && <4.7), base-unicode-symbols (>=0.1.1 && <0.3), bindings-libusb (>=1.4.4 && <1.5), bytestring (>=0.9 && <0.11), text (>=0.5 && <0.12)
Copyright2009–2012 Bas van Dijk <>
AuthorBas van Dijk <>
MaintainerBas van Dijk <>
CategorySystem, Hardware
Home page
Bug tracker
Source repositoryhead: git clone git://
Upload dateSat Sep 8 00:48:55 UTC 2012
Uploaded byBasVanDijk
Downloads2220 total (182 in last 30 days)




Maintainers' corner

For package maintainers and hackage trustees