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Update ucom(4) with information about the new PPS capture abilities.

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Differential Revision:	https://reviews.freebsd.org/D2049
This commit is contained in:
Ian Lepore 2015-03-18 14:49:16 +00:00
parent e1f65999b6
commit 5994d9f10c
1 changed files with 27 additions and 4 deletions
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31
share/man/man4/ucom.4
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@ -29,7 +29,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd October 3, 2014
.Dd March 11, 2015
.Dt UCOM 4
.Os
.Sh NAME
@ -63,11 +63,34 @@ This means that normal programs such as
or
.Xr ppp 8
can be used to access the device.
.Sh Pulse Per Second (PPS) Timing Interface
The
.Nm
driver can capture PPS timing information as defined in RFC 2783.
The API, accessed via
.Xr ioctl 8 ,
is available on the tty device.
To use the PPS capture feature with
.Xr ntpd 8 ,
symlink the tty device to
.Va /dev/pps0.
.Pp
The
.Va portno
locater can be used to decide which port to use for devices that have
multiple external ports.
.Va hw.usb.ucom.pps_mode
sysctl configures the PPS capture mode.
It can be set in
.Xr loader.conf 5
or
.Xr sysctl.conf 5 .
The following capture modes are available:
.Bl -tag -compact -offset "mmmm" -width "mmmm"
.It 0
Capture disabled (default).
.It 1
Capture pulses on the CTS line.
.It 2
Capture pulses on the DCD line.
.El
.Sh FILES
.Bl -tag -width ".Pa /dev/cuaU?"
.It Pa /dev/cuaU?