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[DPRG] serial baudrate converter

Subject: [DPRG] serial baudrate converter
From: D. Daniel McGlothin ddm at mcglothin.info
Date: Wed Sep 8 14:03:53 CDT 2004

http://www.bb-elec.com/product.asp?sku=232BRC&dept_id=53 ?


-----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?


> Dave,
> Although I am not sure it is the "easiest" method, you could easily do
> with a cheap PIC chip with a UART like a 16F628A.  The ideal scenario
> 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,
> you would risk loosing data when going from the 19.2k side to the 9.6k
> 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
> 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
> onto a PCB the size of your thumb. Only thing I would recommend for sure,
> 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
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