Timing Analysis and Verification for Automotive Embedded Systems

Paper #:
  • 2017-01-1618

Published:
  • 2017-03-28
Abstract:
Automotive embedded systems are composed by sensors, ECUs, busses and actuators that in some applications are sensible of timing. This provide an another aspect of timing analysis and verification that demands for new methods and tools at level of code, RTOS (Real-Time Operating Systems) and network. This becomes a top level (= network-level) end-to-end timing requirement for the system. This timing requirement then gets decomposed, i.e. it gets sliced into smaller portions, one portion for each component of the system. The Network level deals with inter ECU communication aspects and end-to-end-timing. Most Network level timing experts are found at the OEMs; they integrate several ECUs connected to various networks in one E/E platform for on vehicle. The RTOS level considers only one scheduling entity (e.g. an ECU with one single core processor) and focuses on scheduling effects. Most RTOS level timing experts are found at the tier-1s; the tier-1 typically integrates all software components into the ECU and also configures the operating system. The Code level focuses on a fragment of code (e.g. a single function) independently of scheduling. The (core) execution time is the most important code level result. Any timing-related activity, problem or use-case can be placed in a diagram with two dimensions: the level and the development phase. with many more timing requirements, all competing for network and computation resources. On an ECU with tasks/interrupts and their runnables, the top level timing requirements are broken down into more fine grained timing requirements and the competition for resources is continued on a lower level. Timing analysis helps planning, understanding, optimizing and securing embedded systems with respect to their timing. This poster sheds a light on the various aspects of embedded timing and timing analysis techniques
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