On Thu, Mar 19, 2015 at 1:25 PM, William Bulley <web@umich.edu> wrote:
> In the good ole' days (prior to object oriented languages) folks would
> have used a "transfer vector" to handle things like this.  It sounds
> like the Arduino ecosystem is object oriented -- I dunno.  But the C
> language definitely is not.  C++ is -- but don't go there...  :-)

Near as I can tell, Arduino is object oriented. Possibly straight C++,
but I'm not knowledgeable in either to know for sure.

> Perhaps write a bevy of functions in C, each of which is slightly
> different, to handle the different hardware types you are dealing
> with. Each function would have the same argument or parameter list
> (the same calling convention, or "signature").  Then index into
> your "transfer vector" (which is a list of function entry points)
> based on some feature of your different hardware needs, and voila!

My current task it to just get the darn thing working with one
encoder. Assuming I can accomplish that, I'm thinking I might pass an
argument when I call the function (something like serviceenc(enc1); ).
In the header file I will define the proper variables to use given a
specific encoder argument, and then deal with substituting those
variables in the library code. I could in theory pass all the
arguments needed when I call the function. I'm still unsure how many
variables I need, and thus how ungainly that might be. Working on it
though!

By the way, I dumped in the .h file from the Arduino library. After
commenting out references to the Arduino specific libraries, it
actually compiles, even with things like this:

class ClickEncoder
{
public:
  typedef enum Button_e {
    Open =3D 0,
    Closed,

    Pressed,
    Held,
    Released,

    Clicked,
    DoubleClicked

  } Button;

That might be because MPLABX does support C++ compilers, but at this
point I'm going to convert everything back to C syntax.

Josh
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