[Diy_efi] Data Logger CPU schematic and C for review

[Steven P. Donegan]

The ION stuff is basically watching for spark plug event, then for 2-3
curves in data and finding the correct ones - one indicates ping, one is
peak pressure - there are others... It's been done on a slow 32 bit
controller so it should be do-able on the ARM...

On Sat, 2007-02-03 at 22:00 +0000, Ian Molton wrote:
> Steven P. Donegan wrote:
> > Given the 'front end' processing the data logger part will be able to do
> > I expect the ARM will be snoozing even if it does the DSP'ish work of
> > analyzing ION sensor inputs :-)
> 
> FFT on an ARM... I wouldnt like to say - its not the fastest of 
> calculations without an FPU or hand crafted fixed point assembly... 
> that said if its merely RPM related functions, then there are simpler 
> algorithms.
> 
> > And I believe the 60k RPM is about 4x any expected usage - being an
> > Engineer I LOVE massive overkill :-)
> 
> That said, if anyone would like us to, erm, test the system on an engine 
> capable of this sort of speed, please don't heasitate to donate one to 
> Steve and I, so we can be sure to get the ECU tailored nicely to work on 
> it...
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