Embedding externally generated C-code within OpenModelica models

Question

We are working with a tool that generates C-code. For example, the C-code could be for the logic: "if a sensor is activated, turn on the LED bulb". The code can be saved into a function that can be called from outside. What is the best way to embed this kind of external C-code into the rest of the Modelica model? How can we compile this code along with the rest of the .mo files preferably using OM Shell script and omc?

Answer 1

You can directly put C code in external functions or link with a library.

See:

• https://specification.modelica.org/v3.4/Ch12.html#external-function-interface
• https://specification.modelica.org/v3.4/Ch12.html#external-objects

As examples see some of our tests from the testsuite:

• https://github.com/OpenModelica/OpenModelica/blob/master/testsuite/simulation/modelica/

Simple example:

• https://github.com/OpenModelica/OpenModelica/blob/master/testsuite/simulation/modelica/external_functions/ExternalLibraries.mo
• https://github.com/OpenModelica/OpenModelica/blob/master/testsuite/simulation/modelica/external_functions/ExternalLibraries.mos
• https://github.com/OpenModelica/OpenModelica/blob/master/testsuite/simulation/modelica/external_functions/ExternalFunc1.c
• https://github.com/OpenModelica/OpenModelica/blob/master/testsuite/simulation/modelica/external_functions/ExternalFunc2.c

Some advanced libraries:

• https://github.com/modelica-3rdparty/Modelica_DeviceDrivers
• https://github.com/modelica-3rdparty/ExternData