Markup and grammar fixes.
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@ -29,22 +29,15 @@
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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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.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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.Bd -literal
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typedef void led_t(void *priv, int onoff);
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.Ed
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.Pp
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.Fd "typedef void led_t(void *priv, int onoff);"
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.Ft dev_t
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.Fo led_create
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.Fa "led_t *func"
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.Fa "void *priv"
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.Fa "char const *name"
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.Fc
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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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.Fo led_destroy
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.Fa "dev_t dev"
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.Fc
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.Fn led_destroy "dev_t dev"
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.Sh DESCRIPTION
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The
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.Nm
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@ -53,39 +46,47 @@ 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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.Va name
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of the annunciator relative "/dev/led/".
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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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.Va priv
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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 ascii strings to the
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"/dev/led/bla" device.
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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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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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.Bl -tag -width Ds -offset indent -compact
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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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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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.Bl -tag -width Ds -offset indent -compact
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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. The pattern continues endlessly.
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.Bl -tag -width Ds -offset indent -compact
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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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@ -94,54 +95,74 @@ _*
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__**
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.It Ic f3
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___***
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.It Ic ...
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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 Ds -offset indent -compact
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.Bl -tag -width indent -offset indent
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.It Ic d%d
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numbers. Each digit is blinked out at 1/10th second, zero as
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ten pulses. Between digits a one second pause and after the last
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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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String.
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This gives full control over the annunciator.
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Letters 'A' ... 'J' turns the annunciator on for from 1/10th to one full
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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 'a' ... 'j' turns the annunciator off for 1/10th
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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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Unless terminated with a '.', the sequence is immediately repeated.
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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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.Bl -tag -width Ds -offset indent -compact
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.It Ic '.'
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becomes _*
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.It Ic '-'
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becomes _***
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.It Ic ' '
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becomes __
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.It Ic '\en'
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becomes ____
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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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.El
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The sequence is repeated after a one second pause.
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.Sh EXAMPLES
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A 'd12' flashes the lamp
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.Bd -literal -offset indent
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*__________*_*______________________________
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.Ed
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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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A 'sAaAbBa' flashes
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.Bd -literal -offset indent
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_*_**__*
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.Ed
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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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.Pp
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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 FILES
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.Bl -tag -width /dev/led/*
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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 SEE ALSO
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