OSEK/VDX
Time-Triggered Operating System
Specification 1.0
OSEKtime OS 1.0 © by OSEK 3
Table of Contents
1 Introduction...........................................................................................................................5
1.1 System Philosophy..........................................................................................................5
1.2 Purpose of this Document ...............................................................................................6
1.3 Structure of this Document..............................................................................................7
2 Summary...............................................................................................................................8
2.1 Architecture of a OSEKtime System...............................................................................8
3 Architecture of the OSEKtime Operating System..................................................................10
3.1 Processing Levels .........................................................................................................10
4 Task Management ...............................................................................................................12
4.1 Task Concept...............................................................................................................12
4.2 Task State Model.........................................................................................................12
4.2.1 Time-triggered Tasks..............................................................................................12
4.3 Activating a Task..........................................................................................................13
4.4 Scheduling Policy – time-triggered Activation................................................................13
4.5 Termination of Tasks ....................................................................................................15
4.6 Deadline Monitoring .....................................................................................................15
4.7 ttIdleTask.....................................................................................................................15
4.8 Application Modes.......................................................................................................16
5 Interrupt Processing.............................................................................................................17
6 Synchronisation....................................................................................................................19
6.1 Synchronisation of System Time....................................................................................19
6.2 Start-up and Resynchronisation.....................................................................................19
6.2.1 Synchronisation Methods........................................................................................20
6.2.2 Synchronisation.......................................................................................................21
7 System Start-up and Shutdown in a mixed OSEKtime / OSEK/VDX System.......................22
7.1 Start-up of mixed OSEKtime and OSEK/VDX OS Systems.........................................22
7.2 Shutdown of mixed OSEKtime and OSEK/VDX OS Systems ......................................22
8 Inter-Task Communication...................................................................................................23
9 Error Handling.....................................................................................................................24
9.1 Error Handling for Deadline Violation............................................................................24
10 Specification of OSEKtime Operating System Services.........................................................25
10.1 Common Data Types....................................................................................................26
10.2 General Naming Conventions........................................................................................26
10.3 Task Management ........................................................................................................27
10.3.1Data Types.............................................................................................................27
10.3.2Constants ...............................................................................................................27
10.3.3Constructional Elements..........................................................................................27
10.3.4System Services......................................................................................................27
10.3.4.1 ttGetTaskID..........................................................................................................................................27
10.3.4.2 ttGetTaskState.....................................................................................................................................28
10.3.5Naming Convention................................................................................................28
