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Reply-To:     pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
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From:         Bob Ammerman <rammerman@VERIZON.NET>
Subject: Re: [PIC]: Hitech PICCLITE state machine optimization
To:           PICLIST@MITVMA.MIT.EDU
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----- Original Message -----
From: "Andrew Warren" <aiw@CYPRESS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, January 30, 2004 7:17 PM
Subject: Re: [PIC]: Hitech PICCLITE state machine optimization


> Herbert Graf <PICLIST@mitvma.mit.edu> wrote:
>
> > if ((ISR_state == 0 && ISR_charBuf == 'G')
> >         || (ISR_state == 1 && ISR_charBuf == 'F')
> >         || (ISR_state == 2 && ISR_charBuf == 'D')
> >         || (ISR_state == 3 && ISR_charBuf == 'V')
> >         || (ISR_state == 4 && ISR_charBuf == 'W')
> >         || (ISR_state == 5 && ISR_charBuf == 'H')
> >         || (ISR_state == 6 && ISR_charBuf == 'Y')
> >         || (ISR_state == 7 && ISR_charBuf == 'Z'))
> >         ISR_state++;
> >
> > Any idea how I might restructure my thinking or code to make this a
> > little tamer?
>
>     Make a constant array of 8 characters; initialize it with G, F,
>     D, V, W, H, Y, Z.  Then:
>
>         if (ISR_charBuf == array[ISR_state]) ISR_state++;
>
>     -Andy

Or even:

    if (ISR_charBuf == "GFDVWWHYZ"[ISR_state]) ISR_state++

Or amazingly:

    if (ISR_charBuf == ISR_state["GFDVWHYZ"]) ISR_state++

Both of the above are legal ANSI "C" (and mean the same thing). With PIC C
compilers YMMV.

Note that in ANSI 'C',     x[y]    is _defined_ to be     *(x+y)

Bob Ammerman
RAm Systems

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