> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Forrest W Christian
> Sent: 26 May 2011 10:21
> To: Microcontroller discussion list - Public.
> Subject: [EE] 'Realtime' async serial analyzer
>=20
> It's product development season again, and one of my key product lines
> has a multidrop ttl-level serial bus between it's main unit and the
> modules.  This works remarkably well until it's time to troubleshoot
> communication issues.
>=20
> The problem is that it does 9 bit serial, and it is almost impossible
to
> find anything which does 9 bit serial protocol analysis, and does it
in
> real time (as opposed to a typical pc logic analyzer which captures
then
> analyzes), and is relatively inexpensive.
>=20
> Is anyone aware of a uart-like interface/analyzer which will monitor 9
> bit serial data - relatively inexpensive, and preferably does
ttl-level
> (although I can definitely 'upconvert' to rs-232 levels really
easily)?
>=20
> Oh, standard baud rates, up to at least 115.2, although higher would
be
> nice...
>=20
> -forrest

We use the Intronix LOGICPORT here, mainly used for SPI and I2C
applications but it also supports asynch and is useful as a generic
logic analyser up to 500Mhz (though buffer size is rather limited for
high speed work).  You can define your own serial protocols for it to
decode.  It was recommended on the Piclist some time ago and has proved
itself invaluable.  It's not particularly cheap in hobbyist terms
however, though it has undoubtedly paid for itself many times over here
at work.

http://www.pctestinstruments.com/


If you need cheap then the open source "Bus Pirate" might be more
suitable,  This is available ready built through several open source
project providers, the Wiki below has links to these.  It supports 9 bit
operation (as long as there is no parity) and has TTL inputs.  A very
handy little tool.

http://dangerousprototypes.com/docs/Bus_Pirate

Regards

Mike

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