Instant Interrupts - Revisited

[mark_s]

Be warned...it's still very much a work in progress, I've just revisited this one & noticed a whopping proble. On the basis that a picture is worth a thousand words, I just posted up a youtube video, which illustrates my last remaining problem - there appears to be bit of an ssue measuring smaller phase shifts...

Have a look at my video on this thread...

http://www.picbasic.co.uk/forum/show...4382#post94382

Hank,

I got my code working last night , thanks to Darrel. The pic chips I am using only have one comparator interupt. By reading the output bits on each comparator and putting an IF statement in the ISR, I can read the frequency and phase like your code. My test so far is with a fixed 180 deg. I need to wire up a variable phase shifter, so that I can compare my results with yours. Not sure why you can't read below 33 deg? Maybe phase locking between the two comparators or interupt house keeping? What happens if you halve the frequency?