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List:       netbsd-port-arm
Subject:    Re: GPS reciever for cubetruck
From:       Greg Troxel <gdt () lexort ! com>
Date:       2020-06-21 20:46:29
Message-ID: rmiwo40cfkq.fsf () s1 ! lexort ! com
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Many receivers in the $20-$50 range have real serial and a TTL-level (or
CMOS level) PPS line, ttat can be hooked to a serial control line or
GPIO.  However, if you calibrate the delay against the net, and then run
with it, you can get sub 5 ms.

The only USB device I have seen with PPS is the "GR601W", a special run
with pps brought out to a modem control line on the USB/serial chip, and
that gets about 1 ms fuzz to interrupts.   I do not believe these are
obtainable now.
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