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[DPRG] serial baudrate converter

Subject: [DPRG] serial baudrate converter
From: David P. Anderson dpa at io.isem.smu.edu
Date: Wed Sep 8 14:19:07 CDT 2004

Howdy

That's the right idea, but too big (and too expensive).  Dale says
this old dog may have to learn a new trick...

best
dpa


> 
> http://www.bb-elec.com/product.asp?sku=232BRC&dept_id=53 ?
> 
> HTH,
> Daniel
> 
> -----Original Message-----
> From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org]On
> Behalf Of David P. Anderson
> Sent: Wednesday, September 08, 2004 2:45 PM
> To: Ted Larson
> Cc: dprglist at dprg.org
> Subject: Re: [DPRG] serial baudrate converter
> 
> 
> Hello Ted, Ed,
> 
> "...size of your thumb" sounds good!
> 
> The host needs to send a one byte query and then receive 4 bytes of data,
> at around 100 Hz, so a 4 byte fifo (maybe in the uart?) would do it.  I was
> hoping for an off-the-shelf solution, Joe's Serial-Converters-R-Us, just
> add water?  No?
> 
> Ted, how's your Robomagellan comming?  Any pictures?
> 
> thanks,
> dpa
> 
> 
> >
> > Dave,
> >
> > Although I am not sure it is the "easiest" method, you could easily do
> this
> > with a cheap PIC chip with a UART like a 16F628A.  The ideal scenario
> would
> > be to use a chip with dual UART's on it, but most of them are larger
> > packages and above $10 in price. You would need to code up a FIFO inside,
> or
> > you would risk loosing data when going from the 19.2k side to the 9.6k
> side.
> > I would hook the 19.2k side to the UART, and then use the interrupt pin B0
> > on the 9.6k side.  If you have a 'C' compiler for the PIC with a good
> serial
> > library, then the whole project wouldn't take more than an hour or two to
> > build and test.  If you used SM parts you could probably get the whole
> thing
> > onto a PCB the size of your thumb. Only thing I would recommend for sure,
> is
> > use a xtal oscillator, and not a resonator or RC clock...the serial timing
> > in software will be highly sensitive to how good your clock is.
> >
> > Hope this helps,
> >
> > - Ted
> >
> >
> >
> >
> > -----Original Message-----
> > From: David P. Anderson [mailto:dpa at io.isem.smu.edu]
> > Sent: Wednesday, September 08, 2004 10:37 AM
> > To: dprglist at dprg.org
> > Subject: [DPRG] serial baudrate converter
> >
> > Howdy
> >
> > I have a device that only speaks 19200 baud serial that needs to talk to a
> > device than only speaks 9600 baud, no handshaking either way.
> >
> > Is there some easy way to do this?  Maybe with a PIC or such?  Needs to be
> > physically small.
> >
> > best,
> > dpa
> >
> > _______________________________________________
> > DPRGlist mailing list
> > DPRGlist at dprg.org
> > http://list.dprg.org/mailman/listinfo/dprglist
> >
> 
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> 
> 
> 


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