[ntp:questions] Cheap ($29.90) GPS receiver

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Mon Apr 19 23:22:38 UTC 2010


> I think that depends on how you set up the chip. I think you can set it
> up so it will interrupt on each byte. This is not terribly efficient for
> a serial port driver, but if it is timing you want, then that is
> probably what you want.

On linux, I use:
  setserial /dev/ttyS0 low_latency

                    Well, actually you probably want the interrupt
>to occur at the beginning of the first start bit of the first
>character, which could in theory on a 4800bd give you  sub ms resolution
>( and maybe much better) .

That's just a constant offset.  You can correct for that.


-- 
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