[Gmecm] On the fly tuning

[Craig Moates]

Darren,

Sounds like some very nice and interesting stuff. I'd love to open a dialogue and help where I can. I've spent some time probing
many of the edge connections to determine what is connected where and how they behave on the scope. One of my present interests is
to develop an easy-to-use internal interface which would use some of the existing edge connector terminals to access RAM data within
the CPU of the PCM. This could, in practice, allow high-speed data acquisition separate and apart from the DLC/OBD2 protocols. I'd
started chasing the possibility of having external RAM to shadow the content in some way if the address or data lines were common
with the Flash bus. However, a serial solution, even if a CPU code patch had to be applied via BDM, would be ideal I think.

Best regards,
Craig Moates


----- Original Message -----
From: "Darren Freed" <darrenfreed at shaw.ca>
To: <gmecm at diy-efi.org>
Sent: Wednesday, June 28, 2006 10:03 AM
Subject: Re: RE: [Gmecm] On the fly tuning


> Yup - connected it to the edge connector.  I used CS8 for the CE signal and CS9 for the OE signal.  Both of these chip selects
aren't used in the stock code.  The SRAM is addressed to $B0000 and the address lines are connected as in the efi332 project (ie
leaving A1 not connected).  It worked well - no troubles at all.  I just need to work on the PC software now, to make it more user
friendly.  Unfortunately I'm over in the UK now for a year, away from my ECM bench.  So everything for the next year will be PC
programming stuff.
>
> On another note, I've been looking at the DLC routines quite abit in a variety of V6 and V8 code, from '96 to '04.  It seems
pretty well conserved throughout, which is good news in terms of developing an interface and programming for datalogging/reflashing.
Although my SCI stuff works well for me, its not particularly useful to anyone else (I suspect).
>
> Darren
>
>
> ----- Original Message -----
> From: Steve Ravet <Steve.Ravet at arm.com>
> Date: Wednesday, June 28, 2006 0:06 am
> Subject: RE: [Gmecm] On the fly tuning
>
> >
> >
> > > -----Original Message-----
> > > From: gmecm-bounces at diy-efi.org
> > > [gmecm-bounces at diy-efi.org] On Behalf Of Darren Freed
> > > Sent: Sunday, June 11, 2006 1:12 PM
> > > To: gmecm at diy-efi.org
> > > Subject: [Gmecm] On the fly tuning
> > >
> > > So I'm one step closer to on the fly tuning with a GM OBDII
> > > pcm.  I've added an additional 16k sram and am able to write
> > > to it and read from it with SCI(ALDL) type comms - ie modify
> > > tables on the fly.  This is similar to what is done with the
> > > efi332 project.
> >
> > Darren, where (physically) did you connect the SRAM?  To the edge
> > connector?  Did you use an unused chip select output, or did you
> > replacean existing item in the CPU memory space?
> >
> > --steve
> >
> >
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