CPU and hardware advice sought for EFI

[David Gravereaux]

Hi All,

I've been pondering this for a while and just thought I'd give in and just do
it.  I want a fully managed engine from a single embedded device doing
everything to run a motor.

Target engine(s):
	Honda 700cc V4 water-cooled from a VF700S Sabre (development)
	Volkswagen 2100cc Type-4 opposed 4, air cooled. (final, ~150 hp target)

I have around 5 years experience doing application level C programming in a
desktop environment -- mainly developer tool and scripting language oriented
with previous experience in electronic repair and design.  This is my first
embedded/real-time device.  Sounds a whole lot more fun than silly developer
tools I do by day ;)

A few weeks ago I was playing around with a Real Time Operating System (RTOS)
called MicroC/OS-II [ http://www.ucos-ii.com ] from the author's book.  Cool
stuff, nice book, gosh I hate assembly...  A friend recommended I have a look at
QNX's Nutrino kernel [ http://www.qnx.com ].  It seems to be gaining acceptance
in automotive appliances.

Designing is research.  `Search` being the predominant part of the word.  Here's
what I found for a controller:

http://www.tern.com/586e_data.htm
http://www.tern.com/p50.htm
http://www.tern.com/flashcore.htm

SRAM is low, but execution code can run out of a flash card.  P-Mode?  cs:ds
gives me a headache.  The p50 looks sweet with all that I/O.  I think my
requirements would be the following:

Inputs:
	(2) lo-sample-rate ADC, cylinder head temp. 1 each side.
	(1) lo-sample-rate ADC, oil temp.
	(1) lo-sample-rate ADC, oil pressure.
	(2) high-sample-rate ADC, knock sensors, 1 each side.
	(1) lo-sample-rate ADC, throttle position sensor.
	(2) lo-sample-rate ADC, manifold absolute pressure, 1 each side.
	(2) lo-sample-rate ADC, exhaust O2 sensors, 1 each side.
	(??) crankshaft/camshaft rotational position.

Outputs:
	(4) lo-side DIO, ignition coil amps for direct fire.
	(4) lo-side DIO, injector drivers.
	(2) lo-sample-rate DAC, servos or steppers for the cooling air flaps.
	    (It's a VW engine, remember?)
	(1) serial I/O to the dash for gauges.


Could people comment on the above and help me fill in the gaps?  I'm rather
overwhelmed, but having fun trying to spec a complete system from what little I
can work through.  I'm trying to prototype the FFT routines for the knock
sensors, now.  Thanks.
--
David Gravereaux <davygrvy at pobox.com>
[species: human; planet: earth,milkyway,alpha sector]
Please be aware of the 7.5 year ping times when placing a call from alpha centari

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