Synopsys, Inc. · NASDAQ:SNPS
Synopsys — Embedded World 2018 Exhibition & Conference
13 slides from Synopsys's conference presentation, Mar 1, 2018
Slide 1: Continuous Integration and Test from Module Level to Virtual System Level
Continuous Integration and Test from Module Level to Virtual System Level 1/3/2018 FOUFAS, ANDREASSON, HARTMANN, JUNGHANNS - PRESENTED AT THE EMBEDDED WORLD 2018 EXHIBITION & CONFERENCE 1
Slide 2: A way of working
A way of working • At Volvo Car Corporation, Propulsion division, we develop our own algorithms • These algorithms control the engine and the gearbox • Equations of physical systems are expressed in Python • These equations or functions are connected into a network • A python package is used to opti
Slide 3: The bigger picture
The bigger picture SIL removes bottlenecks Physical Testing Virtual Testing Number of tests • Physical test cells are limited in numbers due to HW and Facilities EP CD FPD HIL SIL • Virtual test cells are limited by number of SW licenses, only • SIL offers a vehicle like integration environment • SI
Slide 4: History
History • Prior to the current engine generation, all tests done in car • During the development of the current engine generation, automatic unit and system tests were introduced. • Aftertreatment SW solely developed in Sil platform. • One senior SW developer said: now I know it will work when we te
Slide 5: Unit testing an engine control Module
Unit testing an engine control Module • The Software in current generation ECMs is structured into around 250 modules • Unit tests are required to ensure software quality and compliance with industry norms (e.g. ISO 26262) 1/3/2018 FOUFAS, ANDREASSON, HARTMANN, JUNGHANNS - PRESENTED AT THE EMBEDDED
Slide 6: Code instrumentation: Motivation
code instrumentation: Motivation • Functions in the ECU are made • Unit tests need to be up of smaller units during applicable to subfunctions the design phase • Values need to be injected • These Subfunctions are not into the input vector of each represented in generated code subfunction 1/3/2018 F
Slide 7: Code instrumentation: Signal Aliases
code instrumentation: Signal Aliases • Code generators tend to use temporary, local variables • Analysis is needed to determine cases where such a temporary variable is always equal to a measurable signal • Value injecting needs to take into account all aliases of a given input 1/3/2018 FOUFAS, ANDR
Slide 8: Requirement based Test (Motivation)
Requirement based Test (Motivation) • Traditional Unit Tests rely on a small amount of scripted scenarios • Every requirement is associated with a fixed set of stimuli that should result in the wanted behavior • In large systems in a continuous environment it is hard to achieve a sufficient test cov
Slide 9: Requirement based Test (WATCHERS)
Requirement based Test (WATCHERS) • Requirement watchers are defined through preconditions and expected behavior WHENEVER Pressure Cntrl is Active EXPECT Desired Pressure WITHIN 10s • All requirements can be monitored at all times • Watchers are independent of the scope of the test large number of s
Slide 10: SiL Software process
SiL Software process • A DLL of our SW components is created • A text file specifies the System Under Test, can be the whole SW, a set of function, one function or a subsystem of a model • Test cases are extracted from the developers Silver database 1/3/2018 FOUFAS, ANDREASSON, HARTMANN, JUNGHANNS -
Slide 11: SiL Software process
SiL Software process • Test cases are expressed in Python • Run TestWeaver Light on a Jenkins test server as a nightly build • Code coverage is measured by using CTC++ from Verifysoft and reported as HTML 1/3/2018 FOUFAS, ANDREASSON, HARTMANN, JUNGHANNS - PRESENTED AT THE EMBEDDED WORLD 2018 EXHIBIT
Slide 12: Conclusions
Conclusions • The presented method of code instrumentation provides a way to design tests and requirements for arbitrarily small units inside a large system • By ensuring reusability and independence of requirement definitions - watchers, they can be applied to many test – stimuli • The cross produc
Slide 13: Way forward
Way forward • We are currently expanding our Engine, ECU C code range of plant models, so that Sensor and the developers can use closed Emission loop simulations. Models Silver • We have started with Explorative Tests, where the stimuli is Gear Box automatically generated. • We are adding more Addit
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