* ist8310: do reset before WHOAMI call
Apparently, the IST8310's WHOAMI register is writeable. Presumably, this
can get corrupted by bus noise. It is only reset if powered off for 30s.
Therefore, we do a reset before doing the WHOAMI.
* ist8310: improve comment
Co-authored-by: Beat Küng <beat-kueng@gmx.net>
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Co-authored-by: Beat Küng <beat-kueng@gmx.net>
- simple state machine to reset, configure, etc
- checked register mechanism (sensor will reset itself on configuration error)
- configured in 16 bit mode (1320 LSB/Gauss instead of 330 LSB/Gauss)
- adjusted orientation handling in driver to match datasheet as closely as possible
- in many external compass units the rotation was wrong and very difficult to actual determine how to set correctly
