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Burkhard Stubert: Project Portfolio and Expertise
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- 2. © Burkhard Stubert, 2015 About Me • Selected projects – In-vehicle infotainment systems for American and German tier-1 supplier –Driver terminal for Krone forage harvester – In-flight entertainment system – Internet radio on 16-bit microcontroller – VoIP-WAN handset • ~20 years of developing embedded, mobile and desktop systems – Mainly with QML, Qt, C/C++ – Architecture, development, testing, coaching, project leader – Agile projects (Scrum, XP, TDD) • Previous companies – Nokia, Cambridge Consultants, Infineon, Siemens 12/12/14 2 Mail: burkhard.stubert@embeddeduse.com Web: www.embeddeduse.com Mobile: +49 176 721 433 16 Burkhard Stubert Independent Software Craftsman
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- 4. © Burkhard Stubert, 2014 Krone: Driver Terminal (2) Project Schedule • 06/2012: Project start • 08/2012: First prototype in corn harvest –Qt 4.8 on Windows XP and Intel Atom • 02/2013: Usability test with drivers – Qt 5.1 on Linux and ARM Cortex-A8 • 05/2013: Alpha in grass harvest • 08/2013: Beta in corn harvest • 11/2013: Shown at Agritechnica • 04/2014: Product release 26/11/14 4 Old New All done with 3 SW developers and 1 UI designer! My roles: lead developer, architect, coach
- 5. © Burkhard Stubert, 2015 Krone: Driver Terminal (3) System Architecture & Features • Features – Field, road, maintenance mode –Day, night mode – Multiple languages – Metric, imperial units – User input with both touch and jog wheel – Access to engine parameters for fine-tuning – On-board diagnosis – Crop area management (ISOXML export) 20/01/15 5 Linux Terminal CCPilot XS Freescale i.Mx53 OpenGL ES2 RAM: 1GB, Flash: 4GB Display: 10”, 1024x768 Resistive Touch 4x CAN, USB, A/V, Eth Business Logic in Qt/C++ 250 classes Incl. 20 list models 30 ECU functions 200+ CAN messages per sec GUI in QML 150 Screens 50 QML components
- 6. © Burkhard Stubert, 2015 Infotainment System for US Tier-1 • Customer: Indian tier-2 and US tier-1 supplier • Project duration: 10 months •My roles: architect, lead developer, coach, product owner • Technical specification – 10+ applications like Radio, Media, Phone, Settings, Climate implemented in QML (GUI) and Qt/C++ (business logic) – Proprietary inter-process communication between HMI apps and their backend services – Platform: Screen, OpenGL, QNX, Texas Instruments Jacinto 5/6, multi-touch, 3 display sizes/resolutions, hard keys 20/01/15 6
- 7. © Burkhard Stubert, 2015 Infotainment System for US Tier-1 (2) • My tasks – Developed an HMI platform enabling developers to build apps like Radio, Media, Phone quickly and easily –Created library of QML widgets like buttons, status and app bars, list views, dial pads, keyboards, scroll bars, alert dialogs – HMI adapts to 3 different screen resolutions, where one is structurally totally different – HMI adapts dynamically to themes of different car brands (e.g., images, colours) – HMI adapts dynamically to different languages including right-to- left languages – Showed correct use of HMI platform by implementing reference apps for Radio and Settings 20/01/15 7
- 8. © Burkhard Stubert, 2015 Infotainment System for US Tier-1 (3) • My tasks (cont’d) – Developed communication architecture for apps and services abstracting whether apps and services run in different processes/threads or not –Makes it easy to switch between different means of communication like DBUS, PPS, proprietary IPC, Qt signals and slots - no matter whether asynchronous or not – Ensures that GUI and unit testing independent of timing 20/01/15 8
- 9. © Burkhard Stubert, 2015 Infotainment System for US Tier-1 (4) • My tasks (cont’d) – Ramped up team of 50 developers for tier-2 in India –Started with custom-tailored 2-day QML/Qt training for 20+ developers – Went through 2 Scrum sprints with these 20+ developers on real backlog. Helped developers by pair-programming with them. Gave short talks about common problems in mornings. – Split up group of developers into 6 teams. Went through another sprint. Then, added 3-4 developers per team, where the original team took care of the new developers. – Successfully went through 3 releases - on release every 2 months. 4th and 5th release were done successfully with less and less help from me. – Filled role of product owner and overall Scrum master. – Coordinated technical work between development and project management teams of tier-2 and tier-1 - in US, India and Mexico. 20/01/15 9
- 10. © Burkhard Stubert, 2015 Infotainment System for German Tier-1 • Customer: Indian tier-2 and German tier-1 supplier • Project duration: 4 months •Technical specification – 15+ applications like Media, Radio, Phone, Contacts implemented in QML (GUI) and Qt/C++ (business logic) – Applications communicate over DBUS through a Master application – Platform: Wayland, OpenGL, embedded Linux, Freescale i.MX6, multi-touch display, hard keys 20/01/15 10
- 11. © Burkhard Stubert, 2015 Infotainment System for German Tier-1 (2) • My tasks – Speed and memory optimisations of applications at start-up and during runtime –Introduced on-demand creation of QML apps and QML engine saving 8+ MB RAM per app – Found excessive RAM use of Vibrante GPU (12-20 MB for frame buffer instead of 3MB) – Introduced Squish for automated testing of QML GUIs and of inter-application messages – Code review of Connectivity applications - leading to substantial code rework 20/01/15 11
- 12. © Burkhard Stubert, 2015 WAN-VoIP Handset • Customer: xG Technologies • Project duration: 12 months •Technical specification – GUI with Qt/C++ based on Qtopia phone platform – Two modems: Wifi and xG proprietary – Platform: Qt windowing system, no graphics acceleration, embedded Linux, Freescale i.MX27L (ARM9), hard and soft keys 20/01/15 12
- 13. © Burkhard Stubert, 2015 WAN-VoIP Handset (2) • My tasks – Specification, interaction design and implementation of UI: Phone, Wifi, Bluetooth and Settings applications –Optimisation of start-up time of system – Interfaced with client, industrial designers and software developers 20/01/15 13
- 14. © Burkhard Stubert, 2015 Other Projects • Developed UI of low-power and low-cost Internet radio reference platform (bare metal, 16-bit XAP2 processor) – Integrated UI with vTuner online database of radio stations •Wrote requirements and test specifications of IP- based protocols to control traffic signs along British highways – Wrote Wireshark dissectors to analyse protocols • Developed IDE for formal verification of ASICs with Qt/C++ 20/01/15 14
- 15. © Burkhard Stubert, 2015 Skills • People Skills – Building and leading high-performance software development teams –Convincing senior managers and executives of new technologies – Adapting to different human and work cultures • Other Skills – Talk “Case Study: Driver Terminal of Forage Harvester” at Qt Developer Days 2014 – Invited Talk “HMIs of Agricultural Machines for 2016” at COALA Symposium of University of Osnabrück – Talk: “Practical QML - Key Navigation, Dynamic Language Change, Theming” at Qt Developer Days 2013 – Courses: Certified Scrum Master by Ken Schwaber, Usage-Centered Design by Larry Constantine 20/01/15 15
- 16. © Burkhard Stubert, 2015 Skills (2) • Software Skills – Expert Knowledge –Qt, QML and C++ development – Agile software development (Scrum, XP), software architecture, object-oriented design, design patterns, test-driven development (TDD) – Embedded software development on Linux systems (Freescale, Texas Instruments, Nvidia, etc.) – Intermediate Knowledge – JIRA, ReviewBoard, xUnit, QtTest, Squish, svn, git, gdb, gprof, oprofile, valgrind – iOS development, Swift, iBeacons – Interaction design of HMIs – Basic Knowledge – Wireshark, Bluetooth, WLAN, SIP – HTML5, CSS, JavaScript, Java, Perl, Python 20/01/15 16