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READER
INQUIRY
102
BOOSTED
DEVELOPMENT
For some time, TechSAT has been
working with the ambitious C919 CDS
development project for a Chinese
customer. Together the two have
faced the challenge of adhering to an
almost impossible schedule. It was
therefore decided to start verification
in parallel to model development.
All the measures described here
were taken to accelerate the
development to a maximum, right
from the start.
Through rigorous test drive
development, automated data
processing and parallel use of 15
Model Development and Verification
Systems (MDVS) plus five Single
Device Integration Benches (SDIB),
it was possible to create a complete,
integrated CDS prototype within
nine months.
Later, two Full System Integration
Benches (FSIB) will be available for
further integration and verification.
TechSAT can accomplish this continuity, as
requested by its customers, by using its ADS2-
based technology platform. As a logical
consequence, a target simulation for the first
development steps is provided. This ADS2
virtual target simulation (e.g. for VxWorks 653)
is integrated into ADS2 and supports, for
instance, dynamic tests between applications
on the development host. The applications
can therefore use the communication calls
or shared memory accesses of the target
platform unchanged.
NEXT STAGE
For the next development steps, a target
simulator and a test system of the MAYA family
are supplied. The target simulator is a small
real-time system, which in addition to the
target simulation, running on ADS2, also offers
I/O support (ARINC 664, ARINC 429, CAN,
MIL1553, Discrete, etc).
The target simulator enables testing of both
the inter-process communication and the real
I/O transfer of the application. With the attached
test systems of the MAYA family, the additional
possibility arises to create the test procedures
for the software-to-software and hardware-to-
software integration and test their functionality
as early as the development phase.
Therefore, by using model-based
development tools with a built-in code
generator, development times can be greatly
reduced because customers have and can
test executable code during the model-
development phase. Any change in the
model can be directly tested in this way.
CLIENT BENEFITS
In addition to the increase in development
speed at the start of the project, the main
advantage lies in the reduction of
development risks.
Many more errors were found during the
project phases in which error correction did
not actually increase costs.
Another advantage is that from very
early on, information is gathered for system
integration and verification. Verification
can therefore be managed far more
comprehensively and test environments can
be set up to be far more efficient. Additionally
the design-to-test methodology is much
better supported.
At this point the additional measures
for development support carry a positive
effect right through to the formal verification
processes. These measures come under
the term ‘boosting V 0 ’. The numerous but
consistent individual measures that are offered
as part of a development agreement ultimately
allow TechSAT’s clients to save a lot of time
and money with their development projects. z