bug or wrong usage of external functions

[Kiel, Dr. Henning]

Hi list,
 
the Modelica Laguage Spec 3.1 has an example for external function with
two output values (one via return other via pointer parameter) in
chapter 12.9.5.3.
 
I'm trying to simulate an electronic device which reacts on hall pulses
generated by a motor.
I implemented a DC-motor in modelica and am calling my "device"
(external C function "fexttest") via algorithm:
 
  algorithm
    if HallSignal <> pre(HallSignal) then
      (Check, BBR) := fexttest(omega, HallPos, table);
 
This basically works. Has anyone a better construct?
 
Now to the real problem:
I wrote code that should do the same as in the example, but what I see
is that the return value and the pointer parameter values are swapped
(see plot).
In the external function I just return constants to be sure to to know
what I return. I would expect the two values to be just the other way
round.
Is this a bug, or am I doing something wrong?
I attached all required files.
 
    function fexttest
      input Real omega;
      input Integer Position;
      input demoPack_Data PPP;
      output Integer rv;
      output Integer outx;
      external "C" rv = exttest(omega, Position, outx, PPP)
annotation(Library="exttest.o",Include="#include \"exttest.h\"");
    end fexttest;
 
Regards,
Henning



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exttest.c
Description: exttest.c

exttest.h
Description: exttest.h

externaltest.mo
Description: externaltest.mo

externaltest.mos
Description: externaltest.mos

<<attachment: output.png>>