By K. Tanaka
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Extra resources for Embedded Systems - Theory and Design Methodology
If a fault is detected, the blackboard is saved in a fault storage for diagnosis purposes. Finally, the output management executes the action (actuator values a1, a2, a3, and a4 in Fig. 6). This is repeated in each cycle of the task. The Safety Supervisor supervises the correct work of the state machine in the application software. Incorrect data or instruction faults are locally detected by the comparator function inside the state machine implementation whereas the analysis of the fault pattern and the initiation of a dedicated fault reaction are managed globally by a safety supervisor (Mottok, 2006).
Once the overrun is dealt with, the scheduler replaces the overrunning task with a backup task which is set to run immediately before running other tasks. If there is no backup task defined by the user, then the TTC-TG scheduler implements a mechanism which turns the priority of the task that overrun to the lowest so as to reduce the impact of any future overrunning by this task. The function call tree for the TTC-TTG scheduler can be shown in Fig. 18. Main () Update () End Task () Dispatch () Backup Task () Fig.
Operations are transformed accordingly. Mealy state machines are frequently used in embedded automotive systems. The given Safely Embedded Software approach generates the safety of the overall system in the level of the application software, is realized in the high level programming language C, and is evaluated for Mealy state machines with acceptable overhead. An outline of the comprehensive safety architecture is given. The importance of the non-functional requirement safety is more and more recognized in the automotive industry and therewith in the automotive embedded systems area.