Re: [PATCH v3 0/3] leds: add driver for SPI driven WorldSemi WS2812B RGB LEDs

[Pavel Machek]

Hi!

> This patch adds support for driving a chain of WS2812B LED chips
> using SPI bus.
> 
> WorldSemi WS2812B is a individually addressable LED chip that
> can be chained together and controlled individually using a
> single wire. The chip recognize a long pulse as a bit of 1 and
> a short pulse as a bit of 0. Host sends a continuous stream
> of 24-bits color values, each LED chip takes the first 3 byte
> it receives as its color value and passes the leftover bytes to
> the next LED on the chain.
> 
> This driver simulates this protocol using SPI bus by sending
> a long pulse as 3'b110 and a short pulse as 3'b100. The SPI
> frequency needs to be 2.105MHz~2.85MHz for the timing to be
> correct and the controller needs to transfer all the bytes
> continuously.

Is this the same thing as NeoPixel? If so, that may be better-known
name.

Best regards,
								Pavel

-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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