[ntp:questions] GPS clock for Linux

Terje Mathisen terje.mathisen at hda.hydro.com
Tue Sep 16 15:46:43 UTC 2008


Brian Utterback wrote:
> So, apparently not entirely useless. Using USB as a power source is 
> getting to be highly popular. Witness the number of cup warmers, fan, 
> etc. on the market. As long as you don't try to read the signal via USB, 
> it should be okay.
> 
> One thought occurs to me. Would it work to have the PPS signal go to a 
> serial port but the actual NMEA sentences be read via USB? It seems to 
> me if the total jitter of the USB still kept the snetences timing within 
> half a second it would work.

Sure, that should work, except that if you do have a serial port to 
receive the PPS signal on, using the same port for the rest of the 
signal simply makes sense.

The USB-based GPSes all seem to be missing a dedicated PPS signal.

Terje

-- 
- <Terje.Mathisen at hda.hydro.com>
"almost all programming can be viewed as an exercise in caching"




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