PROGRAMMING

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Using OSEK/VDX-compliant operating systems in embedded projects

Embedded systems use microcontrollers to perform the required actions according to the received inputs. The microcontroller offers (among others) I/O ports for interaction with the outside world and a CPU core to run the application program defined in the microcontroller software project. This project needs to include, besides the hardware dependent configuration, a task scheduler, code for peripheral control (drivers) and the actual application modules. The project can also include communication services, libraries and other components. In this article the focus is on scheduling algorithms starting from the super loop, state machine approach and, finally, OSEK/VDX schedulers.