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History log of /src/share/man/man4/si70xxtemp.4
RevisionDateAuthorComments
 1.9  24-Jan-2025  uwe si70xxtemp(4): mark up sysctl node names as Li
 1.8  23-Jan-2025  brad The SI70XX temperature and humidity sensor has a set of commands that
can do the measurement by using I2C clock stretching. Add a sysctl to
allow the driver to use those commands. This is more efficient than
doing the usual polling method of getting the measurements back from
the chip, but only works if the I2C master supports clock stretching.

Also... change the use of the Read without Stop with a command and
zero length read to just a Write of the command in the non-clock
stretching case. I was confused by the datasheet when I write the
driver initially. This allows the driver to work with more I2C
masters.

Also... there were a couple of cases where more bytes were read on
the bus than would be sent by the chip. Fix those. The second part
of the serial number only has 6 bytes not 8, the firmware version has
1 byte not 8.
 1.7  12-Nov-2021  brad Fix the serial number handling of the HTU21D chip and probably others.
Increase the number of read attempts as the HTU21D and probably others
do not respond as fast the actual SI70xx chip can.
 1.6  11-Nov-2021  wiz new sentence, new line.
 1.5  11-Nov-2021  brad Some HTU21D chips do not have a heater register and apparently no
heater element. Disable the heater features in the driver when that
condition is detected and let the attachment succeed. Also mention
that the SHT21 is another clone.
 1.4  08-Feb-2018  dholland Typo fixes from Eitan Adler.
 1.3  30-Dec-2017  christos fix default value (Brad Spenser)
 1.2  29-Dec-2017  wiz New sentence, new line. Use more markup.
 1.1  28-Dec-2017  christos PR/52848: Brad Spencer: Man pages for new drivers

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