[c runtime] FMI setReal/getReal doesn't work

[Lennart Ochel]

Updating an input value using the FMI interface setReal doesn't affect the connected output values using the FMI interface getReal. This can be tested using the following example:

model A
  input Real p;
  input Real u;
  output Real y;
equation
  y = u * p;
end A;

Generate FMUs with both, c and cpp runtime:

setCommandLineOptions("--simCodeTarget=C"); getErrorString();
buildModelFMU(A, version="2.0", fmuType="me", fileNamePrefix="me_A_c", platforms={"static"}); getErrorString();
setCommandLineOptions("--simCodeTarget=Cpp"); getErrorString();
buildModelFMU(A, version="2.0", fmuType="me", fileNamePrefix="me_A_cpp", platforms={"static"}); getErrorString();

// workaround
system("mv A.fmu me_A_cpp.fmu"); getErrorString();

Run the test using OMFMISimulator:

function printAllValues(model)
  print("A.p: " .. getReal(model, "A.p"))
  print("A.u: " .. getReal(model, "A.u"))
  print("A.y: " .. getReal(model, "A.y") .. "\n")
end

tests = {"me_A_c.fmu", "me_A_cpp.fmu"}
for _,test in ipairs(tests) do
  print("Testing " .. test)

  model = newModel()
  instantiateFMU(model, test, "A")

  initialize(model)

  printAllValues(model)

  setReal(model, "A.p", 1.0)
  setReal(model, "A.u", 2.0)
  printAllValues(model)

  setReal(model, "A.p", 1.5)
  printAllValues(model)

  terminate(model)
  unload(model)
end

This will result in the following output:

Testing me_A_c.fmu
A.p: 0.0
A.u: 0.0
A.y: 0.0

A.p: 1.0
A.u: 2.0
A.y: 0.0

A.p: 1.5
A.u: 2.0
A.y: 0.0

Testing me_A_cpp.fmu
A.p: 0.0
A.u: 0.0
A.y: 0.0

A.p: 1.0
A.u: 2.0
A.y: 2.0

A.p: 1.5
A.u: 2.0
A.y: 3.0

The issue is that A.y is not updated if the c runtime is used.

[Lennart Ochel]

This is fixed now with ​OMCompiler#1832. However, all the other types have also to be reviewed.

[Adeel Asghar]

We just need to do the same for all other types.

[Lennart Ochel]

Yes, I will push that change today.

[Lennart Ochel]

Done; see ​OMCompiler#1835.