[Diy_efi] Re: are uC requirements really that high?

[Marcell Gal]

Hi Bill, 

Thanx for your answer. 

> handle this with system timers and general IO

I meant to handle it with timed interrupt. Not
just periodically polling the counter.
(So that I set that I want interrupt at counter=0x1234
and interrupt comes than). The necessery code than
just have to insert an event into an event queue and
reprogram the interrupt if it's before the actually set. 

> Spark is the trickier one as this needs higher resolution.

10-20 us is OK (for most people, right?), and that is doable. 

> a GM DIS pack then that does all the hard work with the crank sensor 
What's not too bad? Does it have significant non-systematic
timing error? 

How can I get the standard pinout of this GM-DIS? (well, I'm also
searching for the pinout of the main GM-compatible computer, so
that I make mine pin-compatible) 

> If you want Coil per plug or a home brew ignition 

I do not want this if the GM DIS is fine, but I have to know
its specifications first. 

> sometime simultaneously.

Simultaneous firing is not a big problem.
One interrupt routine can walk the event queue and handle any events
that are reasonably close (otherwise schedule an interrupt). 

>  Pay a couple of $
> more for the uC and you get loads of timers 

well, yes. I generally agree. I just wanted to know if
these concerns are more threatening than I think. 

The 4 layer efi board sound like a good compromise to me
(if there is a group-manufacturing. Is there an organizer
for these group events whom I should contact?).
I just have to wire it to the conectors to be
compatible with my builtin GM computer's. 


ThX:
Cell 

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