Hijacking OEM hardware

[swagaero]

Webb wrote:
> 
> alex nicu wrote:
> 
> > In my opinion , this takes a lot of time and the results can't
> > be
> > predicted .
> 
> snip
> 
> > And for hardware point of view , way don't you use EFI332
> > project . The
> > 332 uC it's many times faster then your 552 , and some parts
> > are design
> > for controling the engine .
> 
> I agree that the '332 project is a wonderful idea. There are,
> however, none available. The last person on this list to ask
> about it was told "you can't get there from here" He was also
> told that it was not a working system. Only the parts had been
> used successfully.
> 
> The '332 is well suited to the EFI app in one way - the timers
> that can be set to reload without cpu intervention (eliminates an
> interrupt handling routine). And - the thing is certainly high
> performance. More than is needed for a straightforward EFI app.
> Useful only on something using fuzzy logic or some other
> strangeness.
> 
> As far as a '552 not being powerful enough, I disagree wildly!
> You're right that there is no floating point divide command, and
> only a rudimentary fixed point one (This is an upgrade on  the
> '51 instruction set) but this small software penalty is
> manageable. The 68HC11 has been used on many systems, and the
> '552 was diesigen to beat it. Some may disagree about the level
> of success, but i think the notion that the differance is small
> is pretty solid.
> 
> The reason I chose the '552 was that I could get a single board
> computer with 8 channels of 8 bit A/D, an LCD driver, a C
> compiler, an Assembler, a keyboard interface, 128K of ROM, 4 K
> RAM and plenty of digital I/O for $89.
> 
> I'd stand by the choice as the most cost effective, but the OEM
> stuff is even cheaper, and has all the injector drivers and such
> already done. If only there were a complete source of information
> (memory and I/O maps, peripheral chip types and specs, timing
> data - in short, what I got when I bought my '552 board)
> 
> Still seems to me that we could identify a likely victim, and
> force it to divulge it's secrets. These secrets would then become
> a sub-board here - analogous to the '332 area.
> 
> On the subject of the likely victim. Seems like Ford has been
> tried, and it was the engineer who was "Found On Road Dead". GM
> is a good candidate, but in the interest of not stepping on
> Steve's toes, I think I'll pass here too. Currently, I'm looking
> at Subaru, and Tom Cloud's stuff.
> 
> Anyway, Input for the project is solicited.


No you won't step on my toes but after looking at all of them the GM is
the easiest to crack any 2 year hacker can get into it. The 68hc11 is a
good cpu. even though it needs to be improved.

Steve
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