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+.\" $NetBSD: aht20temp.4,v 1.1 2022/11/17 19:20:05 brad Exp $
+.\"
+.\" Copyright (c) 2022 Brad Spencer <brad@anduin.eldar.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd November 15, 2022
+.Dt AHT20TEMP 4
+.Os
+.Sh NAME
+.Nm aht20temp
+.Nd Driver for Guangzhou Aosong AHT20 sensor chip via I2C bus
+.Sh SYNOPSIS
+.Cd "aht20temp* at iic? addr 0x38"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides measurements from the AHT20 humidity/temperature
+sensors via the
+.Xr envsys 4
+framework.
+The
+.Nm
+.Ar addr
+argument selects the address at the
+.Xr iic 4
+bus.
+The crc validity can be changed through
+.Xr sysctl 8
+nodes.
+.Sh SYSCTL VARIABLES
+The following
+.Xr sysctl 3
+variables are provided:
+.Bl -tag -width indent
+.It Li hw.aht20temp0.ignorecrc
+If set, the crc calculation for %RH and temperature will be ignored.
+.It Li hw.aht20temp0.debug
+If the driver is compiled with
+.Dv AHT20_DEBUG ,
+this node will appear and can be used to set the debugging level.
+.It Li hw.aht20temp0.readattempts
+To read %RH or temperature the chip requires that the command be sent,
+then a delay must be observed before a read can be done to get the values
+back.
+The delays are documented in the datasheet for the chip.
+The driver will attempt to read back the values readattempts number of
+times.
+The default is 10 which should be more than enough for most purposes.
+.El
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr iic 4 ,
+.Xr envstat 8 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 10.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Brad Spencer Aq Mt brad@anduin.eldar.org .