from .dsp import DspModule
from ..attributes import FilterRegister


class FilterModule(DspModule):
    inputfilter = FilterRegister(
        0x120,
        filterstages=0x220,
        shiftbits=0x224,
        minbw=0x228,
        doc="Input filter bandwidths [Hz]. "
        "0 = off, "
        "positive bandwidth <=> lowpass, "
        "negative bandwidth <=> highpass. ",
    )

    @property
    def inputfilter_options(self):
        return self.__class__.inputfilter.valid_frequencies(self)

    # _valid_inputfilter_frequencies = inputfilter.valid_frequencies