[aprssig] RE: WRT54G - now simple embedded computer

Alex Carver kf4lvz at yahoo.com
Thu Nov 22 13:20:53 EST 2007

> Message: 6
> Date: Wed, 21 Nov 2007 20:14:10 -0800
> From: Greg D. <ko6th_greg at hotmail.com>
> Subject: RE: [aprssig] RE: WRT54G - now simple
> embedded computer
> To: TAPR APRS Mailing List <aprssig at lists.tapr.org>
> Message-ID:
> <BAY118-W59F0A7B014DD6DB54C73CA9790 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
> Hi Bill,
> You need something with real (buffered) serial ports
> on it.
> I believe any pin on a Stamp can be used for a
> serial port - look at the SERIN command.  The main
> problem you will probably run into is that the Stamp
> only does one thing at a time.  If it's sucking in
> bits from one port, then it's not looking at the
> other one.  So after reading a character from one
> pin, you will miss the next one while you are
> pushing the first one out the second port.  
> Does Parallax have anything with "real" ports on it?
>  Otherwise you might consider picking up an old X86
> PC.  Probably cost a lot less than a Stamp, anyway.

The Basic Stamps from Parallax can not do serial on
any port you choose as normal serial.  They do have
one dedicated serial port and you can do one-at-a-time
serial out of another pin but it won't handle data
passing.  The Javelin series (Java based) CAN do
multiple serial data out multiple pins at once as it
will buffer whatever pins you designate as a serial
port.  The data is written to RAM buffers you
designate in the configuration call.  It doesn't
handle handshaking-you'd have to do that through
software and additional pins.

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