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move WS2812 LED control from bitbang to DMA_PWM #3

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@flforget flforget commented Feb 8, 2022

_ uses Timer 2 (PWM Mode 1, no prescaler, upcounting to 90 -> 800kHz)
_ PWM changes through DMA1 Channel 7 (Memory to Peripheral)

_ uses Timer 2 (PWM Mode 1, no prescaler, upcounting to 90 -> 800kHz)
_ PWM changes through DMA1 Channel 7 (Memory to Peripheral)
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