Get a wrapper for accessing this optional feature.
Value
an object which provides the desired interface, or null if this feature is not available for this spectrometer.
Note
Before calling this function you first need to check that the feature
is supported by the spectrometer in use by calling
is_feature_supported_SPI_bus.
See also
Other Spectrometer I2C- and SPI-bus functions.:
get_I2C_bus(),
get_SPI_bytes(),
get_feature_I2C_bus(),
is_feature_supported_I2C_bus(),
is_feature_supported_SPI_bus()
