Palm interface for the '7747

[Jim Cottrill]

Reid,
I've been away so sorry for the late post.
I would be interested in your PIC interface as I'm doing about the same with
a graphic display.
Thanks for any help.
----- Original Message -----
From: "Reid Bishop" <rbish at ibm.net>
To: <gmecm at diy-efi.org>
Sent: Sunday, February 11, 2001 10:59 PM
Subject: Palm interface for the '7747


> Had lots of requests about my Palm interface to a '7747.
>
> My Palm currently only interfaces to a '7747 ECM (160 Baud only).  This
> required a hardware interface, as the Palm couldn't possibly do the 160
baud
> C3 protocol.  I first prototyped a hardware interface with a Rabbit
> development board from Z-World.  I then built a KISS style hardware
> interface using a PIC processor after I got the Palm all up and running.
> Incidentally, this interface has been tested on a '8062 and some strange
ECM
> in a 2.8 Izuzu Rodeo.  All work equally well, however a couple of the
> bitfields in the ALDL stream remain a mystery.
>
> Basically, my hardware interfaces read the 160 baud interface, convert it,
> and output an ASCII stream at 19,200 or 38,400 bps.  The Palm then reads
in
> this ASCII stream and displays all of the important data from the ALDL
> stream.  Still not _storing_ in the Palm, but I store things on the Rabbit
> for now.
>
> This setup came in real handy on a recent trip from Colorado to Texas and
> back.  I was able to watch how the tuning on my 4.3 equipped Cherokee
> behaved as I dropped from 6300 feet in elevation down to 1000 ft.  All in
> all, the ECM did pretty well most of the way, although it did tend to get
> 'fat' at lower elevations.
>
> The Palm software is still in flux, and needs more work to be useful.
>
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