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ws2812: PIO on the rp2040 breaks WriteByte method #886

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@aykevl

#851 (@gandarez) changed the WS2812 driver to transparently use the PIO driver. Unfortunately, this doesn't work with the WriteByte method that I'm using: it breaks this usage.

My suggestion would be to not switch to PIO transparently but instead have a separate constructor (NewPIOWS2812 perhaps?) that explicitly uses PIO instead of bitbanging.

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