Initialisation of external object fails

[Martin Sjölund]

​https://svn.modelica.org/projects/Modelica_EmbeddedSystems/trunk/Modelica_DeviceDrivers/ @r5977

To silence some warnings, optionally download: ​https://svn.modelica.org/projects/Modelica_EmbeddedSystems/trunk/Modelica_Synchronous/ @r5977

Initialisation of external object fails for Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP. I checked it by adding a print statement to the constructor function, which was never executed. The constructor should be called once (and only once), and before it is used.

Note that the symbolic init could not be used because

Model is structurally singular, error found sorting equations
2: $PRE.getReal.y[2] = $_start(getReal.y[2]);
4: $PRE.getReal.y[1] = $_start(getReal.y[1]);

Bug taken from the ​forums

[Martin Sjölund]

Postponed until 1.9.1

[Bernhard Thiele]

Just wanted to mention that the repo quoted above has moved to ​https://github.com/modelica/Modelica_DeviceDrivers

[Lennart Ochel]

Actually, I get no simulation executable at all. I get the following errors if I try to build that model:

Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP_functions.c: In function ‘omc_Modelica__DeviceDrivers_Packaging_SerialPackager___addRealAsFloat’:
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP_functions.c:216: warning: passing argument 2 of ‘MDD_SerialPackagerAddDoubleAsFloat’ discards qualifiers from pointer target type
/home/lochel/Documents/tests/2045/Modelica_DeviceDrivers/trunk/Modelica_DeviceDrivers 1.3/Resources/Include/MDDSerialPackager.h:244: note: expected ‘double *’ but argument is of type ‘const double *’
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP_functions.c: In function ‘omc_Modelica__DeviceDrivers_Packaging_SerialPackager___addInteger’:
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP_functions.c:225: warning: passing argument 2 of ‘MDD_SerialPackagerAddInteger’ discards qualifiers from pointer target type
/home/lochel/Documents/tests/2045/Modelica_DeviceDrivers/trunk/Modelica_DeviceDrivers 1.3/Resources/Include/MDDSerialPackager.h:162: note: expected ‘int *’ but argument is of type ‘const int *’
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP_functions.c: In function ‘omc_Modelica__DeviceDrivers_Packaging_SerialPackager___addReal’:
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP_functions.c:233: warning: passing argument 2 of ‘MDD_SerialPackagerAddDouble’ discards qualifiers from pointer target type
/home/lochel/Documents/tests/2045/Modelica_DeviceDrivers/trunk/Modelica_DeviceDrivers 1.3/Resources/Include/MDDSerialPackager.h:205: note: expected ‘double *’ but argument is of type ‘const double *’
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP.c: In function ‘Modelica_DeviceDrivers_Blocks_Examples_TestSerialPackager_UDP_eqFunction_82’:
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP.c:521: error: ‘$PgetInteger$PpkgOut$lB1$rB$PautoPkgBitSize’ undeclared (first use in this function)
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP.c:521: error: (Each undeclared identifier is reported only once
Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP.c:521: error: for each function it appears in.)
make: *** [Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP.o] Error 1

[Bernhard Thiele]

Hm, strange. Can confirm that. Was working with Dymola using Visual C on Windows or gcc on Linux. Maybe connected to using the clang compiler. Currently I don't know, but I will have a look into it.

[Martin Sjölund]

That error is not related to the code in the library. It is $PgetInteger$PpkgOut$lB1$rB$PautoPkgBitSize that is not defined anywhere (getInteger.pkgOut[1].autoPkgBitSize).

[Bernhard Thiele]

It exists only on a conditional base and should only be used if "nu == 1".

  when initial() then
    pkgIn.autoPkgBitSize = if nu == 1 then alignAtByteBoundery(pkgOut[1].autoPkgBitSize)*8 + n*64 else n*64;
  end when;

However, even if the model is simplified there are (other) problems. I commited a simplified model to the master branch (Blocks/Examples/TestSerialPackager_UDPMinimalForOMCTest.mo).

This model compiles (though with warnings), but generates a segmentation fault during simulation:

Limited backtrace at point of segmentation fault
/home/bernhard/bt/workrepos/openmodelica/build/lib/omc/libSimulationRuntimeC.so(+0x539d4)[0xb739d4]
[0xda440c]
/tmp/OpenModelica/Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDPMinimalForOMCTest(Modelica_DeviceDrivers_Blocks_Examples_TestSerialPackager_UDPMinimalForOMCTest_eqFunction_11+0x45)[0x8051915]

I can't say whether this is due to initialization, or due s.th. else.

[Martin Sjölund]

This ticket was not closed for 1.9.1, which has now been released. It was batch modified for milestone 1.9.2 (but maybe an empty milestone was more appropriate; feel free to change it).

[Martin Sjölund]

Milestone changed to 1.9.3 since 1.9.2 was released.

[Bernhard Thiele]

The example propagates ExternalObjects in connect equations. This is a problem and currently not supported by OpenModelica. See also the discussion at ​https://trac.modelica.org/Modelica/ticket/1669.

[Martin Sjölund]

Moved to new milestone 1.9.4

[Martin Sjölund]

Milestone pushed to 1.9.5

[Martin Sjölund]

Milestone renamed

[Martin Sjölund]

Ticket retargeted after milestone closed

[Martin Sjölund]

Milestone moved to 1.12.0 due to 1.11.0 already being released.

[Francesco Casella]

The milestone of this ticket has been reassigned to "Future".

If you think the issue is still valid and relevant for you, please select milestone 1.13.0 for back-end, code generation and run-time issues, or 2.0.0 for front-end issues.

If you are aware that the problem is no longer present, please select the milestone corresponding to the version of OMC you used to check that, and set the status to "worksforme".

In both cases, a short informative comment would be welcome.