Software-only USB driver for AVR

The following press release may be interesting to readers of this news group because it presents a complete solution for interfacing AVR mircrocontrollers to USB Hosts. In the minimum configuration the additional cost for USB is one resistor and a USB connector (if you choose the free Open Source software license). Sorry for the partially commercial content!

Die folgende Pressemitteilung koennte LeserInnen dieser Newsgroup interessieren: Sie stellt eine vollstaendige Loesung vor, mit der AVR Mikrocontroller an USB Hosts angeschlossen werden koennen. In der Minimalkonfiguration beschraenken sich die zusaetzlichen Kosten fuer USB auf einen Widerstand und einen USB-Stecker (bei Verwendung der Open Source Software Lizenz). Sorry fuer den teilweise kommerziellen Inhalt!

Subject: PR: Firmware-Only USB Driver for Atmel's AVR Microcontrollers


Objective Development Announces Commercial Licenses and Bundled USB IDs for Their Free Firmware-Only USB Driver for Atmel's AVR Microcontrollers

Vienna, Austria - January 31, 2006 -- Objective Development today released a new version of their firmware-only USB driver for Atmel's AVR microcontrollers (AVR-USB), just in time for the driver's one year anniversary. This version adds new licensing options and free USB Product IDs bundled with all license types, even with the free Open Source compliant license.

AVR-USB is targeted to small companies and hobbyists designing hardware with USB connectivity based on standard AVR microcontrollers. It implements a low speed USB device in the same way as a Software-UART implements asynchronous serial data transfer. The only hardware resources needed from the AVR microcontroller are two I/O pins, one of them must be an edge triggered interrupt.

Since RS232 ports have become rare in modern computers, USB is the method of choice for connecting various gadgets to the PC. The major drawback for small companies and hobbyists is the relatively large upfront investment which is usually required to work with USB: You need to buy a USB Vendor ID from (currently 1,500 USD) and maybe a new development system for USB capable microcontrollers. Furthermore, microcontrollers with USB are often available in SMD packages and large quantities only, making things even harder for small startup companies and hobbyists.

AVR-USB addresses all these issues. It comes with an Open Source license, a USB Product ID which can be used for free (shared according to the certain implementation rules), it is based on the free GNU compiler as development environment and works with low cost AVR microcontrollers which are available in DIP packages. The PC side driver can be constructed with libusb, a free USB abstraction library which is available for Windows, Linux, Mac OS X and BSD Unix. No Microsoft SDK or development environment is required for Windows driver development.

Two affordable commercial license types are available for those who can not agree to the publication requirement of the Open Source license. The entry level license for 199 EUR allows using AVR-USB in up to 150 units and comes with a dedicated USB Product ID for exclusive use. The professional license for 500 EUR has virtually no limit in the number of units (fair use) and comes with two dedicated USB Product IDs.

AVR-USB can be downloaded as part of an example application at the URL

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For more information about AVR-USB see

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------------------------------------ About Objective Development


Objective Development is a creative team of experienced software engineers, specialized in developing innovative, intelligent computing solutions. The brand "Objective Development" represents high quality niche products for private and commercial users, filling the gaps between large standard applications.

The company's product line includes "LaunchBar" (an award winning search utility and recent winner of the Macworld 2005 Editors' Choice Awards), "Little Snitch" (an application based reverse firewall), "WebYep" (a web content management system) and Sharity (an SMB file system for Unix).

------------------------------------ Press Contact


Objective Development Software GmbH Grosse Schiffgasse 1A/7 A-1020 Vienna, Austria, Europe

Christian Starkjohann (Product Manager)

formatting link Fax: +43 1 81749554000

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