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author | ian <ian@FreeBSD.org> | 2015-03-18 14:49:16 +0000 |
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committer | ian <ian@FreeBSD.org> | 2015-03-18 14:49:16 +0000 |
commit | 802960dfac56bd898d4a6d5d2657fa2992f7c555 (patch) | |
tree | 9465b1231183be74b5a95a4d9def1f716dabed47 /share/man/man4/ucom.4 | |
parent | 508f9c2bba8d64e3509d7f1fadc19446097a0037 (diff) | |
download | FreeBSD-src-802960dfac56bd898d4a6d5d2657fa2992f7c555.zip FreeBSD-src-802960dfac56bd898d4a6d5d2657fa2992f7c555.tar.gz |
Update ucom(4) with information about the new PPS capture abilities.
Differential Revision: https://reviews.freebsd.org/D2049
Diffstat (limited to 'share/man/man4/ucom.4')
-rw-r--r-- | share/man/man4/ucom.4 | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/share/man/man4/ucom.4 b/share/man/man4/ucom.4 index a13d4d9..db67206 100644 --- a/share/man/man4/ucom.4 +++ b/share/man/man4/ucom.4 @@ -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? |