1.\" Copyright (c) 2018 Emmanuel Vadot <manu@freebsd.org> 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 12.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 13.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 14.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 15.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 16.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 17.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 18.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 19.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 21.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22.\" 23.\" $FreeBSD$ 24.\" 25.Dd January 12, 2019 26.Dt PWM 8 27.Os 28.Sh NAME 29.Nm pwm 30.Nd configure pwm controller 31.Sh SYNOPSIS 32.Nm 33.Op Fl f Ar device 34.Fl c Ar channel 35.Fl E 36.Nm 37.Op Fl f Ar device 38.Fl c Ar channel 39.Fl D 40.Nm 41.Op Fl f Ar device 42.Fl c Ar channel 43.Fl C 44.Nm 45.Op Fl f Ar device 46.Fl c Ar channel 47.Fl p Ar period 48.Nm 49.Op Fl f Ar device 50.Fl c Ar channel 51.Fl d Ar duty 52.Sh DESCRIPTION 53The 54.Nm 55utility can be used to configure pwm controllers. 56.Pp 57The options are as follow: 58.Bl -tag -width "-c channel" 59.It Fl c Ar channel 60Channel number to operate on 61.It Fl f Ar device 62Device to operate on. 63If not specified, 64.Pa /dev/pwmc0 65is used. 66.It Fl E 67Enable the pwm channel 68.It Fl D 69Disable the pwm channel 70.It Fl C 71Show the configuration of the pwm channel 72.It Fl p Ar period 73Configure the period (in nanoseconds) of the pwm channel 74.It Fl d Ar duty 75Configure the duty (in nanoseconds or percentage) of the pwm channel 76.El 77.Sh EXAMPLES 78.Bl -bullet 79.It 80Show the configuration of the pwm channel: 81.Bd -literal 82pwm -f /dev/pwmc0 -C 83.Ed 84.It 85Configure a 50000 ns period and a 25000 duty cycle: 86.Bd -literal 87pwm -f /dev/pwmc0 -p 50000 -d 25000 88.Ed 89.It 90Configure a 50% duty cycle: 91.Bd -literal 92pwm -f /dev/pwmc0 -d 50% 93.Ed 94.El 95.Sh SEE ALSO 96.Xr pwm 9 , 97.Xr pwmbus 9 98.Sh HISTORY 99The 100.Nm 101utility appeared in 102.Fx 13.0 . 103.Sh AUTHORS 104.An -nosplit 105The 106.Nm 107utility and this manual page were written by 108.An Emmanuel Vadot Aq Mt manu@FreeBSD.org . 109