if we have bus errors the BMM150 can get confused, giving rubbish
output. This uses the checked register code to reset, and a full soft
reset after 250ms of no samples.
- Correctly sort includes and add missing AP_Math.h
- Use anonymous struct for trim_registers in _load_trim_values,
renaming its members so they don't start with underscore
- Don't change _dig* values when we failed to read from sensor
- Add some blank lines
- Make _dig_* members be inside a _dig struct
- Use constrain_int32 instead of if/else chain
- s/time_us/time_usec/
- Construct raw_field with a single constructor in _update()
- Add missing copyright notice
- Group methods together in declaration
Andrew Tridgell
Lucas De Marchi
Mathieu OTHACEHE
Gustavo Jose de Sousa
José Roberto de Souza