194 lines
4.6 KiB
Groff
194 lines
4.6 KiB
Groff
.\" Copyright (c) 2003 Sergey A. Osokin <osa@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 24, 2007
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.Dt LED 4
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.Os
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.Sh NAME
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.Nm led
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.Nd API for manipulating LED's, lamps and other annunciators
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.Sh SYNOPSIS
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.In dev/led/led.h
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.Pp
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.Fd "typedef void led_t(void *priv, int onoff);"
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.Ft struct cdev *
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.Fn led_create_state "led_t *func" "void *priv" "char const *name" "int state"
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.Ft struct cdev *
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.Fn led_create "led_t *func" "void *priv" "char const *name"
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.Ft void
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.Fn led_destroy "struct cdev *"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides generic support for handling LEDs, lamps and other
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annunciators.
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.Pp
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The hardware driver must supply a function to turn the annunciator on and off
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and the device
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.Fa name
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of the annunciator relative to
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.Pa /dev/led/ .
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The
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.Fa priv
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argument is passed back to this on/off function and can be used however
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the hardware driver sees fit.
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.Pp
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The lamp can be controlled by opening and writing
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.Tn ASCII
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strings to the
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.Pa /dev/led/bla
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device.
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.Pp
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In the following, we will use this special notation to indicate the resulting
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output of the annunciator:
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.Pp
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.Bl -tag -width indent -offset indent -compact
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.It Ic *
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The annunciator is on for 1/10th second.
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.It Ic _
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The annunciator is off for 1/10th second.
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.El
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.Pp
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State can be set directly, and since the change happens immediately,
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it is possible to flash the annunciator with very short periods and
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synchronize it with program events.
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It should be noted that there is a non-trivial overhead, so this may
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not be usable for benchmarking or measuring short intervals.
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.Pp
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.Bl -tag -width indent -offset indent -compact
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.It Ic 0
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Turn the annunciator off immediately.
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.It Ic 1
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Turn the annunciator on immediately.
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.El
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.Pp
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Flashing can be set with a given period.
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The pattern continues endlessly.
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.Pp
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.Bl -tag -width indent -offset indent -compact
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.It Ic f
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_*
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.It Ic f1
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_*
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.It Ic f2
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__**
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.It Ic f3
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___***
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.It ...
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.It Ic f9
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_________*********
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.El
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.Pp
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Three high-level commands are available:
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.Bl -tag -width indent -offset indent
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.It Ic d%d
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Numbers.
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Each digit is blinked out at 1/10th second, zero as ten pulses.
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Between digits a one second pause and after the last
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digit a two second pause after which the sequence is repeated.
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.It Ic s%s
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String.
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This gives full control over the annunciator.
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Letters
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.Ql A
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.No ...
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.Ql J
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turn the annunciator on for from 1/10th to one full
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second.
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Letters
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.Ql a
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.No ...
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.Ql j
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turn the annunciator off for 1/10th
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to one full second.
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Letters
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.Ql u
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and
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.Ql U
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turn the annunciator off and on respectively when the next
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UTC second starts.
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Unless terminated with a
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.Ql \&. ,
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the sequence is immediately repeated.
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.It Ic m%s
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Morse.
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.Pp
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.Bl -tag -width indent -offset indent -compact
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.It Ql \&.
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becomes
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.Ql _*
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.It Ql -
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becomes
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.Sq Li _***
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.It Ql "\ "
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becomes
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.Sq Li __
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.It Ql \en
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becomes
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.Sq Li ____
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.El
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.El
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.Pp
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The sequence is repeated after a one second pause.
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.Sh FILES
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.Bl -tag -width ".Pa /dev/led/*"
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.It Pa /dev/led/*
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.El
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.Sh EXAMPLES
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A
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.Sq Li d12
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flashes the lamp
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.Pp
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.Dl *__________*_*______________________________
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.Pp
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A
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.Sq Li sAaAbBa
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flashes
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.Pp
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.Dl *_*__**_
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.Bd -literal
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/usr/games/morse -l "Soekris rocks" > /dev/led/error
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.Ed
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.Sh SEE ALSO
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.Xr morse 6
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 5.2 .
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.Sh AUTHORS
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.An -nosplit
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This software was written by
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.An Poul-Henning Kamp
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.Aq phk@FreeBSD.org .
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.Pp
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This manual page was written by
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.An Sergey A. Osokin
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.Aq osa@FreeBSD.org
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and
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.An Poul-Henning Kamp
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.Aq phk@FreeBSD.org .
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