[Diy_efi] Re: Minimalist micro based EFI ?

[Mike]

At 08:55 PM 3/11/03 +1300, you wrote:
>It is most defineately possible, it's just the limitations that it puts on
>the features available.  ie the ignition/fuel table would have to be small.
>And it wouldn't be able to handle that many different operations
>psuedo-simultaneously.

mmmm, true, though if the critical timing aspects were more or less
synchronous with eficient interrupt handling then the simultaneaity
wont be that much of an issue... But the map resolution would be
a difficult one to get around or alternative interpolation method.

>Without all the extra hardware, ie hardware PWM, TPU etc then trying to get
>the performance that you desire out the processor will be that much harder
>to achieve.

>From what I've done in embedded since late 70's - the processor
most often spends a lot of time in idle loops or recalcing b/ground
variables - I wonder what wew really mean by the term 'performance'
and what sort of metric applies to a synchronous EFI data-model... ?

rgds

mike




>Good luck in trying though,
>Bevan Weiss
>
>> Yeah interesting,
>>
>> It seems to me it should be possible to use a smaller micro and
>> do a classic spi type latched output for things like injectors
>> and digital non-time critical outputs, similarly with inouts.
>> This issue about lots of timers is a bit of a red-herring, it
>> boils down to ram and effective use of a RTC, you can have as
>> many timers as you have ram,
>>
>> So it boils down to a fast enough CPU, some basic 10 bit adc
>> and ram... There should be lots of processors that can handle that
>> and still have room for tables... etc
>>
>> rgds
>>
>> mike
>
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