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Re: Adafruit USB and PPS

From: Gary E. Miller
Subject: Re: Adafruit USB and PPS
Date: Wed, 4 Dec 2019 13:17:47 -0800

Yo Neal!

On Wed, 4 Dec 2019 21:10:00 +0000
Neal Dillman <address@hidden> wrote:

> Then run ppscheck against your serial port:
>                 ppscheck /dev/ttyUSB0
> /home/pi/gpsd-3.19# ./ppscheck /dev/ttyUSB4
> # Seconds  nanoSecs   Signals
> PPS ioctl(TIOCMIWAIT) failed: 25 Inappropriate ioctl for device

And you are sure /dev/ttyUSB4 connects to the receiver?  If so then
the driver is confrmed bad for PPS.  Nothing gpsd can do about a bad
kernel driver.

> Saw that.  And the error from ppscheck indicates the tty is not a
> serial tty, not RI specific.

PPS with gpsd needs a serial tty.  Without the modem control signals
there is no way to read the PPS.

> And gpsd is getting a stream from the
> device just fine.  There is probably an easy answer I am missing :|

The easy answer is that your GPS will not work with that driver.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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