AVR-USB Links

Host Side USB Drivers

libusb.sourceforge.net - An abstraction library for controlling USB functionality on Unix (Linux, BSD, Mac OS X, etc).

libusb-win32.sourceforge.net - A Windows version of libusb with the same API. It requires the installation of a kernel DLL which is part of libusb-win32.

www.icsharpcode.net/OpenSource/SharpUSBLib - A C# wrapper around libusb-win32.

Other Firmware-Only USB Drivers

www.cesko.host.sk - This is Igor Češko's original work. Although it has given the inspiration for AVR-USB, the two projects share no common code.

www.xs4all.nl/~dicks/avr/usbtiny - This is Dick Streefland's driver which is derived from an earlier version of AVR-USB. Dick's driver has less options and the code is therefore easier to read.

Driver Firmware for AVRs with USB Hardware

www.fourwalledcubicle.com/MyUSB.php - This project is an LGPL'd USB driver for Atmel's AT90USBXXX AVR microcontroller series. It runs on Atmel's USBKEY, STK525 and STK526 boards.

savannah.nongnu.org/projects/avrusb - A freeware USB driver for the AT43USB3XX series of chips. The project seems to be dead, though.

Embedded USB Hosts

instruct1.cit.cornell.edu/courses/ee476/Fin... - This is a firmware-only low speed USB host for AVRs.

www.vinculum.com - Their USB host chip is an easy method of adding USB host functionality with little effort.

www.embedded-projects.net/index.php?page_id... - This USB host driver supports Atmel AVRs with built-in USB hardware and the SL811HS chip. It includes class drivers for various USB classes.

There is at least one more firmware-only low speed host available for the AVR, but I don't remember the URL. If you know it, please drop us a note!

USB Analyzers

www.sxlist.com/techref/io/serial/usb/atapch... - A firmware-only low speed USB hardware analyzer.

sourceforge.net/projects/usbsnoop - This is a USB sniffer for Windows. It is of great value when debugging firmware problems in a USB device.

USB Documentation

www.usb.org/developers/docs - The USB specification. Not easy to read, but the definitive reference.

www.beyondlogic.org/usbnutshell/usb1.htm - "USB in a Nutshell" is a good overview of the relevant parts of the USB specification. Read this instead of the real spec!

www.lvr.com/usb.htm - Many good links related to USB.