Enum in micropython - alternative?

[martynwheeler]

Hi,

Is there a way to handle enum classes in micropython?

I am porting a library which has an enum class.

Code: Select all

class ModemConfig(Enum):
    Bw125Cr45Sf128 = (0x72, 0x74, 0x04)
    Bw500Cr45Sf128 = (0x92, 0x74, 0x04)
    Bw31_25Cr48Sf512 = (0x48, 0x94, 0x04)
    Bw125Cr48Sf4096 = (0x78, 0xc4, 0x0c)

I guess I could replace with an if elif but was wondering if there was a neater way?

Thank you

Martyn

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[stijn]

How do you use it? I mean if you just erase the (Enum) part he class itself will work fine, right?

[pythoncoder]

The enum.Enum class is part of the CPython library but not the MicroPython one.

[martynwheeler]

Hi,

It is used a little later on to access values from the tuple by

Code: Select all

        # set modem config (Bw125Cr45Sf128)
        self._spi_write(REG_1D_MODEM_CONFIG1, self._modem_config.value[0])
        self._spi_write(REG_1E_MODEM_CONFIG2, self._modem_config.value[1])
        self._spi_write(REG_26_MODEM_CONFIG3, self._modem_config.value[2])

I am not sure, but does this guarantee the order of values to always be the same?

Thanks

[stijn]

Which values? The Bw125Cr45Sf128 etc values are tuples, they have a fixed order. Not sure why you'd even need an enum for this. Might as well use a dict mapping strings to tuple or so. But looking at this piece of code, it doesn't show why you'd need the different constants - especially not because the comment says it's doing something for Bw125Cr45Sf128 but it doesn't reference that fact by accessing ModemConfig.Bw125Cr45Sf128. tldr; many alternatives, but without seeing how it's supposed to be used it's hard to tell what fits best.

[martynwheeler]

Hi,

Thanks for the reply. It seems that enum was not needed and i could just access values from the tuple.

Thanks again