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Re: gpsd autobaud and cpu usage

From: Eric S. Raymond
Subject: Re: gpsd autobaud and cpu usage
Date: Sat, 26 Sep 2020 03:32:10 -0400

Paul Fertser <>:
> Hey Gary!
> On Fri, Sep 25, 2020 at 05:40:29PM -0700, Gary E. Miller wrote:
> > 8 speeds, times 2 seconds per test, times 3 parity (E, N, O) times
> > 1 stop bits (0, 1, 2).
> Is there any UART hardware that's really using anything but 1 stop bit
> _by default_?

On computers, no,  But there are GPDes that emit 7E2 and other weird modes.

> I can imagine someone could reconfigure some receivers
> to use 2 stop bits (and that would be an odd and uncommon idea so
> probably not worth including in the auto-probing at all), but I
> haven't ever saw UART equipment that worked without stop bits
> altogether.

I don't think 0 stop bits is possible either, though I could be

> Also, since you have plenty of experience with different receivers,
> can you tell what parity is more common, even or odd (my guess it's
> odd)?

Nope, N (no parity) is by far the most common.
                <a href="";>Eric S. Raymond</a>

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