Doesn't information require at least 1 byte.. such as the size of an int ...

> On Sat, 17 Mar 2001, J.A.YOUNG wrote:
>
> > I am writing a program in Hitech PIC C-Lite (under MPLAB) for a
PIC16F84. The
> > aim is to get a micromouse to the middle of a maze. The maze data is
stored in
> > an array, which for a full size maze must be ~33*33.
> >
> > At the moment I get errors if I use an array bigger than 7*5. Something
about
> > words and BANK0- memory things. I saw something in the archive about
> > limitations on memory, but it didn't help. Do I need to use a number of
PICs or
> > can I use a different method.
>
> Are you using one *byte* per maze unit, or one or more *bits*?  You'll
> need 1098 bytes if you do it that way, but you could use, say, one or two
> bits per unit and fit it in much less space.
>
> I know I saw something on this recently, but darned if I can remember what
> or when.  You might want to check the list archives.  All I can figure out
> with five minutes' thought is to use three bits per cell (you already know
> the way you got into your current position is open), which would still
> require 363 bytes. You could use an external EEPROM and get all the space
> you need and more.
>
> > I also need to set up an interrrupt on a port, so that when the sensory
data
> > changes, I can call a routine.
>
> You can use PORTB interrupt on change for that, or use the INT/RB0 pin, or
> just set up TMR0 to interrupt on a regular basis and check the sensors
> then.
>
> > My C is fairly basic and my assembler is non-existent. Any help or
> > ideas would be great.
>
> My advice would be to work out the logic of finding your way through the
> maze first.  Once you have that figured out, do some reading up on the
> 16F84 to make sure you understand the limitations and opportunities
> offered by the hardware.  Then work on your programming skills to
> translate that into a program.  Make the program fit the method, not vice
> versa.  If it turns out you simply can't make it fit in a 16F84, look at
> external serial EEPROM, the 16F628 or a 16F87x processor.
>
> Hope this helps a little, and good luck!
>
> Dale
> ---
> The most exciting phrase to hear in science, the one that heralds new
> discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
>                 -- Isaac Asimov
>
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