This is the Readme file to Objective Development's firmware-only USB driverfor Atmel AVR microcontrollers. For more information please visithttp://www.obdev.at/avrusb/This directory contains the USB firmware only. Copy it as-is to your ownproject and add your own version of "usbconfig.h". A template for your own"usbconfig.h" can be found in "usbconfig-prototype.h" in this directory.TECHNICAL DOCUMENTATION=======================The technical documentation for the firmware driver is contained in the file"usbdrv.h". Please read all of it carefully!USB IDENTIFIERS===============Every USB device needs a vendor- and a product-identifier (VID and PID). VIDsare obtained from usb.org for a price of 1,500 USD. Once you have a VID, youcan assign PIDs at will.Since an entry level cost of 1,500 USD is too high for most small companiesand hobbyists, we provide a single VID/PID pair for free. If you want to useyour own VID and PID instead of our's, define the macros "USB_CFG_VENDOR_ID"and "USB_CFG_DEVICE_ID" accordingly in "usbconfig.h".To use our predefined VID/PID pair, you MUST conform to a couple ofrequirements. See the file "USBID-License.txt" for details.Objective Development also has some offerings which include product IDs. Seehttp://www.obdev.at/avrusb/ for details.HOST DRIVER===========You have received this driver together with an example device implementationand an example host driver. The host driver is based on libusb and compileson various Unix flavors (Linux, BSD, Mac OS X). It also compiles natively onWindows using MinGW (see www.mingw.org) and libusb-win32 (seelibusb-win32.sourceforge.net). The "Automator" project contains a nativeWindows host driver (not based on libusb) for Human Interface Devices.DEVELOPMENT SYSTEM==================This driver has been developed and optimized for the GNU compiler version 3(gcc 3). It does work well with gcc 4 and future versions will probably beoptimized for gcc 4. We recommend that you use the GNU compiler suite becauseit is freely available. AVR-USB has also been ported to the IAR compiler andassembler. It has been tested with IAR 4.10B/W32 and 4.12A/W32 on an ATmega8with the "small" and "tiny" memory model. Please note that gcc is moreefficient for usbdrv.c because this module has been deliberately optimizedfor gcc.USING AVR-USB FOR FREE======================The AVR firmware driver is published under the GNU General Public LicenseVersion 2 (GPL2). See the file "License.txt" for details.If you decide for the free GPL2, we STRONGLY ENCOURAGE you to do the followingthings IN ADDITION to the obligations from the GPL2:(1) Publish your entire project on a web site and drop us a note with the URL.Use the form at http://www.obdev.at/avrusb/feedback.html for your submission.(2) Adhere to minimum publication standards. Please include AT LEAST:    - a circuit diagram in PDF, PNG or GIF format    - full source code for the host software    - a Readme.txt file in ASCII format which describes the purpose of the      project and what can be found in which directories and which files    - a reference to http://www.obdev.at/avrusb/(3) If you improve the driver firmware itself, please give us a free licenseto your modifications for our commercial license offerings.COMMERCIAL LICENSES FOR AVR-USB===============================If you don't want to publish your source code under the terms of the GPL2,you can simply pay money for AVR-USB. As an additional benefit you getUSB PIDs for free, licensed exclusively to you. See the file"CommercialLicense.txt" for details.