[Diy_efi] Traction control strategy

[bcroe at juno.com]

I have used this method.  Just let the timer count, and 
subtract the previous count from the latest.  If the last 
reading is smaller, put a 1 in front of it before subtracting. 

You need enough bits to be sure the counter can't go all 
the way around in one sample interval.  I inhibited the 
count while reading, because a change at that instant 
could give you a very strange combination of the old 
and new value.

Bruce Roe


> Others have mentioned reseting the counts, I wouldn't 
> bother.  Just write your software to take into account when 
> they roll over, and make sure to poll fast enough so that 
> you can guarantee that they would never be able to roll 
> over twice between reads.  Then just always subtract the
> previous reading from the current reading.  Doing this 
> simplifies the interface glue a bit.
> 
> Brian

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