I'm a bit unsure exactly what you want to accomplish, but you could certainly setup an interrupt handler using external "C" in Modelica; as far as I know the DeviceDrivers library does not expose interrupts to the user.

I am trying to, for the sake of this question, achieve a real-time system with OM and arduino.

On using a C interrupt handler, like what's used  in https://stackoverflow.com/questions/151 … n-in-linux, what I understood was that the code being activated during the interrupt would have to be placed in the C function itself. Which, owing to my lack of C experience, I wasn't able to traverse through.

So you want a simulation using OMEdit to send some data to the Arduino? If you just send data on the serial port, you would trigger the interrupt on the Arduino and the other way around...

I want to send data to the arduino, and receive some output from it as well. Using the aforementioned code as an external function, could that be achieved?

https://build.openmodelica.org/Document … ceive.html and
https://build.openmodelica.org/Document … tSend.html might be easier to use, but as far as I remember, they require sending data packets of the same size all the time and just keep the last received packet in the buffer (or some other odd behavior).

So I tried using it, but I have been unable to get clean data from the arduino. Often as I try to read data from the serial port, large portions of it are garbled. Would you have a clue as to what might be happening?

I am using an analog function generator connected to the arduino, and using the serial receive and unpack int to read it. The firmware involves a Serial.write(analogRead(A5)) in the loop with a delay and that's it.

Thanks.