Yeah, the penny pinching attitude still sticks.  I remember there was =
some other reason I didn't use the hardware UART on this chip, but I =
can't remember what is was....  But there are plenty of pins, shouldn't =
be too tough to move them around.=20



-- Lawrence Lile, P.E.
Electrical and Electronic Solutions
Project Solutions Companies
www.projsolco.com
> -----Original Message-----
> From: Matt Pobursky [mailto:piclist@MPS-DESIGN.COM]
> Sent: Friday, August 20, 2004 12:02 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC:] Architecture for serial comms in C
>=20
> On Fri, 20 Aug 2004 09:34:29 -0500, Lawrence Lile wrote:
> > So here is the architecture question:  To interrupt or poll?  Put =
the
> > RX line and interrupt on PortB,0, and use the "external interrupt"?
> > Move it all back to a hardware UART, and use that as an interrupt
> > source?  Or poll it all the time with kbhit() ? How do other people
> > approach this?
>=20
> Since you are out of the "squeeze every penny till it screams" =
consumer
> world, make life easy on yourself and just use an interrupt driven
> hardware serial port. I know it's a tough attitude to break (been =
there
> and done that myself, having designed consumer gear in the past also).
>=20
> Virtually all of my designs now have a hardware serial port whether
> required or not that can be used for diagnostics and testing. The
> difference in pin count and cost of a slightly more capable PIC is
> usually a good tradeoff in development time and aggravation. You also
> get very little performance hit on the interrupt driven hardware
> method. One other thing I also like to do is make sure I've got an
> upgrade path to a larger memory PIC of the same footprint/family type
> if at all possible. You can develop with the larger part and move down
> to a smaller one for production if cost is an issue. You can also move
> UP in production if your client/boss etc. decides to add more software
> "features" after the initial design. Bet that's never happened to
> anyone, right? ;-)
>=20
> Matt Pobursky
> Maximum Performance Systems
>=20
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>=20
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>=20

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=20

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