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Data Coupling Basics in DO-178C
Control Coupling Basics in DO-178C
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DO-278A Guidance: Introduction to RTCA DO-278 approval
ISO 26262
Data Coupling & Control Coupling
Verifying additional code for DO-178C
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DO-178C Multicore In-person Training (Fort Worth, TX)
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Summary
The challenge
- Unit testing and code coverage analysis for electric car charging status indicator software
- Software needed to comply with end customer’s Software Risk Assessment requirements
The solution
- Deployment of RapiTest and RapiCover for continuous testing and reporting in the customer’s in-house continuous integration
framework
The benefits
- Rapita’s customer Danlaw delivered their software on time and on budget, faster than previous projects using competitor tools
The challenge
Danlaw India were approached by an OEM automotive company to develop software for a charging indicator for electric vehicle charging. For acceptance of Danlaw’s software by its customer, the software would need to be verified comprehensively to pass the customer’s Software Risk Assessment. This included unit testing of the developed software, as well as a requirement that 95% or higher code coverage was achieved through this testing.
The software was being developed for a charging status indicator that would use a Melexis Smart LED driver Integrated Circuit. The target processor had limited resources available to support on-target testing.
Danlaw’s preferred approach to verification was to run it continuously throughout the software development process, achieving verification for new modules as they were being developed. For optimal efficiency, their verification solution would need to hook into their inhouse continuous integration framework, so tests could be run continuously throughout the project, verification results could be kept up to date, and overall progress could be easily tracked.
The solution
Rapita Systems worked with Danlaw to deploy the Rapita Verification Suite (RVS) to support unit testing and code coverage analysis. This included an integration of both RapiTest to write unit tests, and RapiCover to instrument the code for coverage up to the Modified Condition/Decision Coverage (MC/DC) level.
Danlaw preferred minimizing testing overheads, and being able to run all tests and coverage analysis in a single build. As the Melexis target had limited resources to support the injection of test harness and instrumentation code, the integration was set up on-host. This ensured fast rework cycles and supported continuous testing with Danlaw’s growing suite of unit and regression tests throughout the development process. RVS was integrated with Danlaw’s in-house continuous integration framework to support this process, automating test runs and result reporting throughout development.
The software being developed by Danlaw needed to pass the end customer’s Software Risk Assessment for final acceptance. This included demonstration of unit test results, and a requirement that at least 95% of the code had been covered to the MC/DC level during testing.
RVS tools supported this by allowing Danlaw to automatically generate exported results for review by their customer.
The benefits
Danlaw’s use of RVS for software verification helped them develop and verify their code efficiently, with the following benefits:
- The use of RVS tools helped Danlaw pass their customer’s Software Risk Assessment, and deliver their software on time and on budget.
- Flexible integration of the RVS tools enabled continuous testing and reporting through Danlaw’s in-house continuous integration framework. This helped Danlaw increase the reliability of the code rapidly; areas that would benefit from improvement were quickly highlighted by test and coverage results alongside development.
- Danlaw found that using RVS reduced their testing time compared to using competitor tools.
- Results from RVS could be trusted – RVS tools have been qualified for use in DO-178C and ISO 26262 projects, and the instrumentation applied by RVS is qualified.
“RVS tools helped us develop and verify software for our customers on time and on budget. The flexibility of the integration meant we could hook RVS up with our continuous integration framework, so we could run tests and collect coverage results throughout our development and minimize later rework.
Using RVS helped us improve our software and meet our customer’s Software Risk Assessment requirements faster than other software we’ve used on previous projects.”
Kiran Kumar
Technical Manager, Automotive Electronics Software
Danlaw India
