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2578c12e39
- Rename "aux.[ch]" to "util.[ch]" which is a more common name for utility functions and allows checkout on some non-FreeBSD systems where the "aux.*" namespace is reserved. - Fix some compile warnings while at it. PR: usb/183728 MFC after: 2 weeks |
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| bulk.c | ||
| control.c | ||
| Makefile | ||
| README | ||
| util.c | ||
| util.h | ||
As I dug my own way through the documentation of libusb 2.0 that ships with FreeBSD 8+ as the OS'es own USB library API, I noticed there are only few code examples around under /usr/src (namely, usbconfig itself). The libusb20(3) man page is a starting point, but it's a reference manual, nothing less, nothing more. Using just a reference, it's not very easy to start writing your own code based on that. So I started writing my own examples, to "get a feeling" about how to use the library. I covered two typical scenarios which are common for a number of devices. The first one is called "bulk", and uses bulk output (host to device) and input transfers to talk to an USB device. The second one is called "control", and can use both control output and input transfers, as well as so-called interrupt transfers. The latter are used for data that are being reported frequently or repeatedly, like position updates from a pointing device (mouse). Despite of its name, the host has to poll devices for their interrupt transfers on each USB frame (i.e., each 1 ms). Recommended reading is the USB 3.0 specification (the older 2.0 one would do as well), to be found under http://www.usb.org/developers/docs/ as well as documents for individual USB device classes where appropriate. Feel free to be liberal in the licensing of these examples: while the beer-ware license mandates to keep the license notice, this only applies to modifications of the original examples itself. For copy&pasting (even a larger) piece of an example into your own work, I won't imply you have to reproduce the beer-ware license text there. Feel free to credit my name in your derived work if you want. Dresden, July 2012 Joerg Wunsch <joerg@FreeBSD.org> # $FreeBSD$