Call a function in INO from a CPP file

Projects Programming
2

The best way is to move the function in the cpp or create another cpp and include its header file in both your cpp and the ino.
If you realy want to keep it int the ino file, you must give it as parameter of the function

In your cpp

void CheckSerialInput(void (*f)(int, bool) )
{
  //do stuff
  (*f)(number, state);
  //do stuff
}

In your .ino

void SwitchLight(int number, bool state);

void loop {
  //do stuff
  CheckSerialInput(SwitchLight);
  //do stuff
}

void SwitchLight(int number, bool state) {
  //do stuff
}