[ag-automation] FDDI (Fieldbus Device Driver Interface) Update

[Dieter Hess]

Hello,
here is an updated version of the FDDI:
- for information the overview as odt-document (not changed since last time)
- fddi.h: the header file for the fddi (updated)
- fddi.c: a prototype implementation of fddi (compilable but not tested) to better understand how fddi is meant to work

Some remarks:
- The implementation in fddi.c is just a prototype, to get the idea how it is working.
  I know that there are a lot of improvements like error handling, more dynamic data structures etc.
- I didn't rework fddi.h regarding coding guidelines, because I don't know the coding guidelines right now.
  Of course I have no problems to follow the coding guidelines, but I would do it in a second step.
- To test the fddi at least two other modules are needed:
  - A Fieldbus Device Driver (for example a CANopen Stack) including a definition for configuration
  - An application using the fddi
  As I am not planning to implement a fieldbus stack in the near future I would be happy if someone else will do this using the fddi.
  For definitions of configuration profiles I have suggestions for CANopen, Profibus, EtherCAT, SERCOS III and ProfiNet.
  But I will wait until someone write a real stack, because formatting them definitions is quite a lot of work.

Best regards

Dieter Hess 
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