grouping pins?

Archiver

Is there an easy to group a set of pins such that they can be referred to as
a single byte?

I'm specifically interested in getting a 9 bit word into and out of a device
via a parallel interface. I'd really like to be able to refer to the word by
a single moniker like 'data_in' for the sake of the operations I'm
performing on it.

help?

-dave

Dave Paton Motorola Advanced Technology Center
voice 847.538.7575 pager 888.773.6802
A13593@e...

Archiver

Hey Dave. Gee, did you used to work for Moto SPS Microprocessors in Austin?
Your name sure sounds familiar.

On the Stamp2, you can refer to the 16-bit I/O as INS or OUTS. Or you can
refer to one of the 8 bit banks: INH, INL, OUTH, OUTL. Or you can refer to
one of 4, 4-bit banks: INA, INB, INC, IND, OUTA, OUTB, OUTC, OUTD. Or you
can go bit by bit (in0, in1... etc.)

There isn't a real handy way to group 9 bits, that I know of. I'd probably
punt and use a gosub:


input_bits var word

gosub read_9bits
if input_bits = $100 then blah
yadda
yadda
yadda



read_9bits:
input_bits = INS & $1FF
return



Regards,

Al Williams
AWC
* 8 channels of PWM: http://www.al-williams.com/awce/pak5.htm


>

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Original Message

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> From: Paton Dave-A13593 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=M9oM24XH7--bwHn9NaOcZgtPE0rrurzo9-o7CTiBNRGweTtw5TjiGrfdfCZgl7aX3G942TJOnwVaa_FEWGTdohJM06uj]a13593@l...[/url
> Sent: Monday, July 31, 2000 1:16 PM
> To: 'stamp list'
> Subject: [noparse][[/noparse]basicstamps] grouping pins?
>
>
> Is there an easy to group a set of pins such that they can be
> referred to as
> a single byte?
>
> I'm specifically interested in getting a 9 bit word into and out
> of a device
> via a parallel interface. I'd really like to be able to refer to
> the word by
> a single moniker like 'data_in' for the sake of the operations I'm
> performing on it.
>
> help?
>
> -dave
>
> Dave Paton Motorola Advanced Technology Center
> voice 847.538.7575 pager 888.773.6802
> A13593@e...
>
>