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© Burkhard Stubert, 2015
Expertise and Project References
Burkhard Stubert
Independent Software Craftsman
burkhard.stubert@embeddeduse.com
20/01/15
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© 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
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Mail: burkhard.stubert@embeddeduse.com
Web: www.embeddeduse.com
Mobile: +49 176 721 433 16
Burkhard Stubert
Independent Software Craftsman

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© Burkhard Stubert, 2015
Krone: Driver Terminal
for BiGX Forage Harvester
20/01/15
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© 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
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Old
New
All done with 3 SW developers
and 1 UI designer!
My roles: lead developer,
architect, coach

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© 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)
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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

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© 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
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© 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
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© 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
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© 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.
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© 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
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© 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
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© 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
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© 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
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© 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
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© 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
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© 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
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