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Refine neopixel timing #4102

@dhalbert

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@dhalbert

Users have seen some glitches writing NeoPixel strings on SAMD51 with CircuitPython. I took some timings in July 2020 of the NeoPixel one and zero waveforms, both for the Arduino code and neopixel_write. It seems like some SAMD51 times could be adjusted

image

@PaintYourDragon You mentioned recently about the "1/3 - 2/3" rule of thumb for NeoPixels, if I remember right. Do you see marginal values above, especially in the SAMD51 CircuitPython columns? Thanks.

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