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+.\" $NetBSD: bmx280thp.4,v 1.5 2022/12/03 01:04:42 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 19, 2022
+.Dt BMX280THP 4
+.Os
+.Sh NAME
+.Nm bmx280thp
+.Nd Driver for Bosch BMP280/BME280 sensor chip via I2C bus
+.Sh SYNOPSIS
+.Cd "bmx280thp* at iic? addr 0x76"
+.Cd "bmx280thp* at iic? addr 0x77"
+
+.Cd "bmx280thp* at spi? slave 0"
+.Cd "bmx280thp* at spi? slave 1"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides measurements from the BMP280 and BME280 temperature,
+humidity and barometric pressure sensors via the
+.Xr envsys 4
+framework.
+The
+.Nm
+.Ar addr
+argument selects the address at the
+.Xr iic 4
+bus and the
+.Nm
+.Ar slave
+argument selects which chip select will be used on the
+.Xr spi 4
+bus.
+The precision of the measurement which is related to the over
+sampling performed on the measurement 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.bmx280thp0.osrs_t
+.It Li hw.bmx280thp0.osrs_p
+.It Li hw.bmx280thp0.osrs_h
+These control oversampling of temperature, pressure and humidity.
+The valid values are 1, 2, 4, 8, and 16 times oversample.
+Humidity is only available if the chip is a BME280.
+.It Li hw.bmx280thp0.irr_samples
+IRR is a filter that can be used to reduce the noise in the
+measurement.
+The value values are 1 (or off), 2, 5, 11 and 22 samples
+to reach >= 75% of the step response.
+.It Li hw.bmx280thp0.waitfactor.t
+.It Li hw.bmx280thp0.waitfactor.p
+.It Li hw.bmx280thp0.waitfactor.h
+These control the wait multiplication factor for a measurement cycle.
+This factor is different for temperature, pressure and humidity and
+is based upon the values of osrs_t, osrs_p and osrs_h.
+If the chip does not return the correct measurements for a given
+over sampling then the wait factors can be adjusted to allow more
+time for the measurement to complete successfully.
+.It Li hw.bmx280thp0.debug
+.It Li hw.bmx280thp0.dump_calibration
+If the driver is compiled with
+.Dv BMX280_DEBUG ,
+these nodes will appear and can be used to set the debugging level and
+provide the calibration constants, upon refresh, that are stored in the
+chip.
+Since the constants are fixed, this is a boolean node and will
+reset back to false once one dump has been performed.
+.It Li hw.bmx280thp0.readattempts
+A status register tells the driver if the chip is busy with a measurement.
+This status register must be polled and readattempts is the number of times
+that this poll will be performed.
+The default is 25 which should be more than enough for most purposes.
+.El
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr iic 4 ,
+.Xr spi 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 .
+.Sh BUGS
+The driver does not support the continuous read mode that the BMP280
+and BME280 has.