Joel Mathew Hegberg
JoelHegberg@computer.org
http://www.JoelHegberg.com

• Engineering of Computer Based Systems
• Real-Time Systems
• Wearable Information Systems
• Software Engineering Education
• Software Process
• Standards (SESC)

In addition, the variety of technologies I've worked with has provided me great experience in areas such as embedded OS designs (OS-9, Linux, Windows Mobile, Symbian), Networking (TCP/IP/PPP, SMTP/POP3/IMAP), cryptography (Cryptoki and BSAFE standards from RSA), cellular technologies (3G and Edge), Bluetooth (stack, profiles, interoperability testing, firmware download drivers for USB and UART components), and Digital TV Broadcast standards.

This variety of experience has given me a much better view of the "big picture" of the software development cycle (from concept, to architecture, to design, to testing, to marketing, to sales, to support) than I had when I first started within the industry.

Staff Software Engineer with General Dynamics C4 Systems.

• Developed PowerPC-based code without an Operating System.
• Developed a highly efficient UDP/IP(/ARP) networking stack.
• Created PCI initialization, enumeration, and configuration software.
• Created 16550 UART drivers (for both local controllers and PCI-based cards).
• Utilized Level-1 cache for run-time optimization.
• Managed Level-2 cache in various configurations (cache, SRAM block, peripheral stache).
• Worked on Data Coherency for a CPU (Freescale MPC8544), L1 & L2 cache, DDR RAM, and various peripherals on the system.
• Created I2C drivers for reading various sensor data.
• Analyzed system for very low latency to improve performance by 10 times.
• Managed Ethernet (eTSEC) drivers to interface with networking stack.

• Bluetooth / WiFi coexistence development for Broadcom, CSR, and TI chipsets. Debugged coexistence issues using logic scopes, over-the-air packet sniffers, server-side throughput software, and embedded device HCI sniffing.
• Worked with car manufacturers (Landrover, BMW, Jaguar, Audi, Aston Martin) on Bluetooth carkit/cell phone interoperability.
• Attended multiple Bluetooth Unplugfest events worldwide for interoperability testing / debugging.
• Worked on Broadcom 2045, 2046, 4325 Bluetooth stack and driver integration with Microsoft Windows Mobile OS.
• Updated Windows Mobile Bluetooth and UART drivers for better power management.
• Created factory test software for automated testing of Bluetooth, UART, and USB components.
• Wrote Broadcom 2035 and CSR BC3ROM Bluetooth USB drivers for Symbian OS cellular phones.
• Written USB Host class drivers to provide an interface between two processors within a cellular phone.
• Debugged USB inter-processor communications using a CATC USB Chief protocol analyzer.
• Debugged Bluetooth USB Host class drivers for Broadcom BCM2033 chipset used in a Symbian OS mobile phone.
• Optimized and debugged 27.010 Mux protocol written as a Symbian OS CSY module.
• Debugged Mobile-Originated and Mobile-Terminated (MO/MT) voice and data calls using an Anritsu GSM base station.
• Assisted in architecture design process for multiprocessor-based smart-phone solutions based on high-speed wireless networks such as GPRS and Packet CDMA.
• Created and maintained networking protocol stack and interface libraries for Point-to-Point Protocol (PPP).
• Created and maintained SMTP, POP3, and IMAP email protocol libraries for use in embedded environments such as cellular phones and set-top boxes.
• Developed a real-time WAP (Wireless Application Protocol) service daemon to handle browser requests from a Java Virtual Machine.
• Debugged protocol incompatibilities between a new cell phone and various TCP/IP/PPP protocol stacks, including Windows NT/2000, PocketPC, and various flavors of Unix.
• Maintained and added features to existing Network Interface Control  (NIC) software to provide needed internet features over an existing GSM cellular network.
• Performed testing using a RACAL GSM simulator for cellular data performance measurements and debugging.

While in this position, I worked with many top companies including Broadcom, TI, CSR, Microsoft, ATT, NTT DoCoMo, Symbian, SoftConnex, Mentor Graphics, Hitachi, Denso, Harman/Becker, Parrot, Frontline, Peiker, and others.

While in this position, I worked with many large customers including Motorola, Intel, Rockwell, Zenith, 3Com, CompuServe, FAA, Nortel, Bell Atlantic, and Fermilab.

• Provided on-site support and development at Motorola for 10 months, providing technical assistance on their MAP digital cellular phone project which included writing and upgrading POP3/IMAP/SMTP email libraries, PPP connectivity software, and modem CHAT libraries.
• Provided on-site training and assistance for Communicate in London, England, when they were bought by Motorola to interface their wireless GSM cellular protocols with the MAP phone project software.
• Architected and implemented a cryptographic package for the OS-9 RTOS based on the Cryptoki and BSAFE standards from RSA.  The end product incorporated a wide variety of protocols, including DSA digitial signatures, RSA, DES and Triple-DES, RC2, RC4, and RC5.  This project was for a set-top box deployed by Hong Kong Telecom.
• Implemented several dynamic network protocol stack drivers for OS-9's mwSoftStax networking infrastructure and added new features/bug fixes to the mwSoftStax framework.  During this process, I architected a simpler method of writing protocol stack drivers within OS-9.
• Designed channel navigation API's for DVB and ATSC digital television standards for Microware's Digital Broadcast Environment package.
• Developed a graphical front-end ("player shell") application as an example for digital set-top box developers using Microware's Digital Broadcast Environment package.
• Created session management API's and daemons to implement the DSM-CC application download protocol over various networks.
• Developed video games for use on digital TV set-top boxes (playable via an infrared remote control) using various graphics effects libraries I also wrote.  These programs also included writing API's to support various graphics formats such as BMP, GIF, and JPG.
• Authored chapters for Microware's published manuals on many of the API's I worked on, and also included many example networking and graphical applications to illustrate the concepts.
• Designed and implemented extensive test suites for various projects under ISO-9001 requirements to meet strict Quality Assurance standards.

• SuperSoft, Inc.  (Jackson, Michigan)
• CoCoPRO!  (Ypsilanti, Michigan)
• Sub-Etha Software  (Lufkin, Texas)

Between the years of 1992 and 1995, I served as the director of OS-9/68k operations for Sub-Etha Software.  This involved development efforts for new products, creating print advertisements, and traveling to computer shows to give seminars.

My employment and education have allowed me to work on a large variety of hardware platforms, including the following:

• Small embedded devices (cellular phones, pagers, set-top boxes)
• Embedded development systems (Motorola MVME 680x0, Motorola MVME PowerPC, Motorola MBX, Motorola PowerStack, Motorola Hellcat, Cirrus Logic 7111 ARM3, Intel Brutus StrongARM reference platform, TI OMAP2420, TI OMAP3430)
• Workstations such as Sun Sparcs for Unix, Macintosh systems, and PC systems (running Linux, Windows NT/2000, Windows 95/98/XP/Vista, and MS-DOS)
• Mainframe computing systems including IBM AS/400, IBM-370, and the HP-3000

While at both Motorola and Microware Systems, I have developed software under both Unix- and Windows-hosted environments using ClearCase version control software, DDTS defect tracking software, as well as embedded OS-9 RTOS resident-hosted development tools, Symbian OS tools, and Microsoft Windows Mobile development tools.  For software development, I have used Microsoft Visual C & C++, Windows CE / Mobile tools, Symbian OS tools, and Microware Fastrak Hawk tools (integrated editor, compiler, debugger, profiler software).