IMPLEMENTING A SIMPLE USB INTERFACE FOR AN EMBEDDED PROCESSOR

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	IMPLEMENTING A SIMPLE USB INTERFACE
FOR AN EMBEDDED PROCESSOR by Stuart Allman Start ı Typical USB Solutions ı Required Components ı An Easier Solution ı Following the Rules ı Firmware ı Vendor-Specific Requests ı Host Transfer Mechanisms ı USB Transfers ı How Does It Work? ı The Grand Conclusion ı Sources and PDF SOURCES and PDF Download the PDF of this Article. Stuart Allman works for Cypress Semiconductor in the USB microcontroller development tools group. In his spare time, he is a DSP guru wannabe and is always up for a good audio discussion. He can be reached at sea@cypress.com. SOURCES The embedded USB interface design package and CY7C6401 Cypress Semiconductor Corp. (408) 943-2600 Fax: (408) 943-6848 www.cypress.com/design/progprods/usb/usbrefdesign.html Registered at ChipCenter? Buy Now! MC68331 Motorola Semiconductor Products (602) 952-4103 Fax: (602) 952-4067 www.mot-sps.com Registered at QuestLink? Buy Now! AT91M63/4399 (ARM7DTMI) Atmel Corp. (408) 441-0311 Fax: (408) 436-4200 www.atmel.com Registered at ChipCenter? Buy Now! ADSP-21065L DSP and SHARC 21065L EZ-LAB Analog Devices, Inc. (617) 329-4700 Fax: (617) 329-1241 www.analogdevices.com Registered at QuestLink? Buy Now! REFERNCES Cypress Semiconductor Corp., "CY7C64013 CY7C64113 Full-Speed USB (12 Mbps) Function," 2000. USB Revision 2.0 Specification, www.usb.org/developers/docs.html. USB development tools, www.usb.org/developers/tools.html. Microsoft Windows Point of Sale (POSUSB) driver information, www.eu.microsoft.com/hwdev/usb/posusb.htm. RESOURCES Jungo USB driver development tools information, www.jungo.com/windriver.html. BSQUARE USB driver development tools information, www.bsquare.com. Compuware Corp., NuMega USB driver development tools information, www.numega.com/drivercentral/default.asp. Linux USB project information, www.linux-usb.org. Apple Computer, Inc., Macintosh USB hardware and driver information, http://developer.apple.com/hardware/usb/. PREVIOUS Circuit Cellar provides up-to-date information for engineers. Visit www.circuitcellar.com for more information and additional articles. For subscription information, call (860) 875-2199, subscribe@circuitcellar.com or subscribe online. ıCircuit Cellar, the Magazine for Computer Applications. Posted with permission.