On 9/21/15 12:13 PM, Robert LaJeunesse wrote:
The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer
Module that appears to allow a single counter to be captured into independent
registers from independent inputs. Not sure, but PJRC tends to run the clock
fast (96MHz) so relative timing resolution should be much better than 0.1
microseconds.
A bit of googling: FreqMeasure library for the Teensy can time stamp
zero crossings on pin 3
Apparently, the code is there to use up to 4 pins, but it's not really
set up for multiple pins.
It uses the hardware to capture, and then an ISR to unload the register
and buffer them up.
It also works on Arduinos.
https://www.pjrc.com/teensy/td_libs_FreqMeasure.html
the diagram in the K20 manual shows a two stage D flip-flop synchronizer
driven off the system clock, and then a simple rising/falling edge (or,
really, a 0->1 or 1->0 transition detector, which then latches the counter.
(Figure 37-175 in the manual)
Is this "time-nuts" precision capable. I've not tried to drive an
Arduino or teensy with an external clock, which I think might be a
starting point.
Bob LaJeunesse
Sent: Monday, September 21, 2015 at 1:45 PM
From: "Can Altineller" <altinel...@gmail.com>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Subject: [time-nuts] algorithms and hardware for comparing clock pulses
Dear Time-nuts,
...
I probably need a hardware to measure the time pulses more precisely.
...
Are there any solutions to this problem?
...
Best Regards,
Can Altineller
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