Validate host provided index prior to accessing memory using that
index.
Also, consistently use a uint8_t for max_sections (to account for
integer overflow issues).
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This is an implementation of the SOS fliltering algorithm that runs on the MCU.
The filter opperates on data in fixed point format to avoid use of the FPU as klipper does not support FPU usage.
This host object handles duties of initalizing and resetting the filter so client dont have to declare their own commands for these opperations. Clients can select how many integer bits they want to use for both the filter coefficients and the filters output value. An arbitrary number of filter sections can be configured. Filters can be designed on the fly with the SciPy library or loaded from another source.
Signed-off-by: Gareth Farrington <gareth@waves.ky>
