William D. Welch, Jr.

35 Thunder Rd.

Albertville, AL 35951 USA

bill.welch@ieee.org

1-256-505-1433 (cell)

SUMMARY:

Over twenty-five years of engineering experience in many diverse areas, from writing device drivers for VAX/VMS, thru several flavors of UNIX, Linux and Windows, to numerous embedded systems. Ability to work very close to the hardware, and communicate effectively with digital, analog, and RF engineers. Very detail oriented and known for constructive comments during design and document reviews, for clear explanations of technical concepts, and for an intuitive understanding of software and systems.

TECHNICAL EXPERTISE:

· Embedded Systems: (more than 15 years)

· Programming Languages: more than 25 years of C. Other languages as needed, various machine languages, some C++, C#, ASP.NET, VB. Agile development (XP).

· Operating System Device Drivers: Linux, Windows, UNIX, VAX/VMS

· Networking: SSL, TCP/IP, UDP, DHCP, ARP, LWIP, uIP, firewall, VPN, Ethernet bridge

· CPUs: Xilinx Virtex-5 PowerPC 440, NXP LPC2378, ARM, MIPS, x86, Microchip Picmicro 16Fxx and 18Fxx, IXP420, Atmel AVR, BCM4712, x86 PC, 8031, Clipper, VAX, PDP

· Software Tools: GNU compiler tools, Xilinx XPS, XMD, GDB, Visual Studio, OpenWRT, Asterisk, PacketProtector, OpenVPN, BusyBox, pthreads, X11, Bash, iptables. TCL, Matlab

· Bench Tools: Oscilloscopes, Logic Analyzers

· Ultra-wideband UWB radio, theory and practice ( 7 + years)

EDUCATION: B.S. Electrical Engineering, Auburn University, 1978

PROFESSIONAL EXPERIENCE

W. D. Welch Consulting, Albertville, AL 2006 - present

Owner.

Embedded software development for Xilinx Virtex-5 PowerPC CPU, using LWIP, System ACE, DDR2, TEMAC gigabit ethernet with multicast filtering. Linux was also evaluated. Embedded software development for NXP LPC2378 system, including TCP/IP and USB. Software development for the Asterisk PBX. Embedded software development for Microchip 18F4620 data logger using SD card – FAT filesystem, RS232, SPI bus interface. Embedded software for Microchip 18F67J60 Internet appliance data logger. Software development for web-based messaging system, using ASP.NET and SQL database.

Avocent Corporation, Huntsville, AL 2002 - 2006

Senior Staff Engineer

Member software development team for a line of embedded internet appliances - Digital Keyboard-Video-Mouse over TCP/IP. These products are generating significant revenue for the company. Responsibilities included video mode recognition firmware, performance enhancements, device drivers for: video subsystem, DMA controller, hardware timer, interrupt handlers, and SSL/TLS hardware acceleration.

Time Domain Corporation, Huntsville, AL 1995 - 2002

Senior Engineer

Proposed initial concept and provided high-level system spec for the company’s first evaluation kit for UWB radio technology. Designed and developed embedded packet radio software. When the vendor-supplied RTOS was not available, very quickly developed an RTOS and network stack with UDP and DHCP. This in-house developed RTOS provided more than a year of useful service. Provided critical design input to overall radio architecture and chip design. Worked on system-level test vectors for UWB chipset. Developed discrete simulators for UWB signals and systems. Entire systems were simulated, including transmitter, multipath channel, receiver, acquisition, tracking, modulation, demodulation. Worked on various patent ideas, which were awarded, including a unique half-duplex ranging scheme. Limited experience with FEC- convolutional codes, Reed-Solomon, Hamming.

MaxVision Corporation, Huntsville, AL 1993 - 1995

Principal Engineer

One of six co-founders of the company. Was responsible for software design and development for a unique dual-screen, high-resolution SVGA card. Modified the BIOS to support the configuring of the FPGA, and support various non-standard screen resolutions. Developed one of the earliest known dual-screen device drivers for Microsoft Windows NT.

Intergraph Corp., Huntsville, AL 1991 - 1993

Senior Systems Consultant

Member of software development team for an electronic schematic capture package, running on Windows. Helped with company-wide migration to Windows NT from various legacy systems. Ported large third-party packages to the Clipper (UNIX), to Windows NT, and to Sun Solaris.

W. D. Welch Consulting, Huntsville, AL 1989 - 1991

Owner.

Ported numerous analysis software packages from DOS to Windows. Added TCP/IP support to a Windows schematic capture application.

ZAIAZ Corp., Huntsville, AL 1983 - 1988

Vice-President of Engineering

Responsible for UNIX software porting, device drivers, networking. Led hardware and software design and development for the PC market. As part of a two-man team, built a prototype DEC Qbus CPU card, with onboard RISC NS16K CPU, running UNIX using DEC I/O. Developed state-machine for the bus interface. This prototype resulted in a long-term relationship with a vendor who had a lot of DEC compatible I/O cards and needed to migrate to UNIX. Developed software for an existing RISC NS16K PC/AT “accelerator” card, enabling it to run UNIX with DOS I/O. Shipped a demo copy to the vendor, to prove that it really worked. The vendor was impressed, but unable to produce sufficient quantities of the card. Their customers came to us, and we produced a series of boards, ultimately based on the Clipper CPU. Our high-speed graphics connector enabled some amazing graphics capability and led to sales overseas of our product. Some consulting for Intergraph. Helped one division of Intergraph migrate to UNIX- Helped with very first port of UNIX, ever, to Intergraph hardware. Provided UNIX kernel driver training, etc. Participated in development efforts on NS32K and Clipper platforms. Some limited telephony consulting. Telephone tester, 68K RTOS for local measured metering system.

General Digital Industries, Huntsville, AL 1980 – 1982

Engineer

Work on various embedded systems, based on DEC LSI-11 hardware, and a VT52 emulator for a custom video terminal. Developed early prototype of embedded system for Federal Express. Worked with RT-11, RSX11M, and UNIX operating systems.

System Development Corp., Huntsville, AL 1978 – 1980

Engineer

Worked on systems analysis and software design on VAX/VMS. Developed networking device drivers for the beta-test of the some the very first VAX systems ever produced.

ADDITIONAL INFORMATION

INDEPENDENT RESEARCH and STUDY

· Embedded PID controller with thermocouple input and TRIAC and Power Mosfet outputs.

· NSLU2 NAS and Bluetooth PAN gateway using embedded Debian Linux

· Implemented non-trivial LAN, using multiple Linksys WRT54G routers running OpenWRT, firewall using Iptables, OpenVPN, WPA, adhoc (OLSR), X10. Nodes included wired and wireless desktop, laptop, and handheld devices, running Linux and Windows.

· Experimented with XBee point-to-point link for data logging and Internet appliance use.

· Evaluated the Arduino as a possible embedded Internet appliance.

· Evaluated Python for Internet data logging.

· Implemented IR and 443 MHz wireless links for remote sensor and remote control.

· Studied JAVA’s JVM. Wrote some small programs to explore the efficiency of floating point. Also looked at GNU’s GCJ approach to combining C, C++ and JAVA.

· Evaluated Ruby on Rails to build a web site to facilitate study and research into Web 2.0, agile development, MySQL, CSS, XHTML, AJAX, CSS and more.

OPEN SOURCE PROJECTS

· Wrote a significant portion of the JAL Wifi and JAL Ethernet projects. Implemented a minimal yet functional TCP/IP stack and web server.

· Independently developed WIFI device drivers and example code for EDTP.COM’s Airdrop WIFI card, uses Intersil Prism chipset.

AMATEUR RADIO PROJECTS

· Small, portable solid-state CW transmitter and receiver, useful on camping trips. Very stable.

· Vacuum tube transmitter with VFO. A fun “retro” project using 1950s technology.

· Half-duplex packet radio modem, built on a PC/AT compatible I/O card. Useful for 2 meter packet radio activities.

· Electronic keyer – 8031, hardware and firmware project. Provides several speeds of Morse code and canned messages

· PC based DSP software- LMS audio filtering, FIR brick-wall CW audio filtering. Uses PC soundcard and any radio.

· Bench equipment in my home workshop- 100 Mhz oscilloscope.