ECU files

[Steve Ravet]

"C. Brooks" wrote:
> 
> Thanks Steve, I found it :)
> 
> OK, assuming I'm able to identify a series of blocks as a table (Big
> assumption :)  How do I find out what type of table it is? i.e. VE fuel,
> acceleration enrichment, spark advance etc... ?

Eyeball it to make a guess.  Then make a change and see what happens via
diacom or the like.  That's where Bruce's ECM testbench comes in handy. 
There's a description of it on the gmecm page.

I don't know what ECM you're using, but before you stare at it too much,
take a look at the 747 image using one of the .ecu files on the incoming
site.  Once you learn what the tables look like it's easier to spot them
in new images.  ie, see how the spark advance changes based on rpm and
load.

Also you might take a look at tuna, a program I wrote.  It's on the ftp
site as tuna.zip.  It doesn't edit, but it does dump a bin to the screen
in readable ascii format.  The advantage to tuna IMO is it's version of
the .ecu file is much more readable.  It's also quick to run at the
command like, and there's a Sparc version included in the .zip file  :-)

> 
> It looks like the data points in Promedit are scaled 0-255, is that for all
> tables or do some tables use a different scale? Would be totally wrong to
> assume that all the data points consist of three places? i.e. 001-255 (Or
> whatever the scale is)

Determining the scale is another mystery.  Read programming 101, it
talks about how the 747 converts byte data into real world units.

--steve

> 
> Charles Brooks
> 
> -----Original Message-----
> From: steve ravet <Steve.Ravet at arm.com>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Monday, June 14, 1999 9:45 PM
> Subject: Re: ECU files
> 
> >If you get the promedit .zip file there should be a readme file in
> >there.  Each line describes the layout of a data table.  the format of
> >the line depends on whether the table is zero, one, two, or three
> >dimensional.
> >

--
Steve Ravet
sravet at arm.com
Advanced Risc Machines, INC
www.arm.com