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67 lines
1.8 KiB
67 lines
1.8 KiB
\section{NeoPixel Unit}
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The NeoPixel unit implements the protocol needed to control a digital \gls{LED} strip with WS2812, WS2811, or compatible \gls{LED} driver chips. The NeoPixel protocol (explained in \cref{sec:theory-neo}) is implemented in software, therefore it is available on any \gls{GPIO} pin of the module.
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The color data can be loaded in five different format: as packed bytes (3$\times$8 bits color), or as the little- or big-endian encoding of colors in a 32-bit format: 0x00RRGGBB or 0x00BBGGRR. The 32-bit format is convenient when the colors are already represented as an array of 32-bit integers, e.g., extracted from a screen capture or an image.
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\subsection{NeoPixel Configuration}
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\begin{inicode}
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[NPX:neo@3]
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# Data pin
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pin=A0
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# Number of pixels
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pixels=32
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\end{inicode}
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\subsection{NeoPixel Commands}
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\begin{cmdlist}
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0 & \cname{CLEAR}
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Switch all \glspl{LED} off (sets them to black) & \\
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1 & \cname{LOAD}
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Load a sequence of R,G,B bytes
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& \begin{cmdreq}
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\item For each \glspl{LED}:
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\begin{pldlist}
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\cfield{u8} red
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\cfield{u8} green
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\cfield{u8} blue
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\end{pldlist}
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\end{cmdreq} \\
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4 & \cname{LOAD\_U32\_ZRGB}
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Load 32-bit big-endian 0xRRGGBB (0,R,G,B)
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& \begin{cmdreq}
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\cfield{u32[]} color data (big-endian)
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\end{cmdreq} \\
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5 & \cname{LOAD\_U32\_ZBGR}
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Load 32-bit big-endian 0xBBGGRR (0,B,G,R)
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& \begin{cmdreq}
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\cfield{u32[]} color data (big-endian)
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\end{cmdreq} \\
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6 & \cname{LOAD\_U32\_RGBZ}
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Load 32-bit little-endian 0xBBGGRR (R,G,B,0)
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& \begin{cmdreq}
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\cfield{u32[]} color data (little-endian)
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\end{cmdreq} \\
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7 & \cname{LOAD\_U32\_BGRZ}
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Load 32-bit little-endian 0xRRGGBB (B,G,R,0)
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& \begin{cmdreq}
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\cfield{u32[]} color data (little-endian)
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\end{cmdreq} \\
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10 & \cname{GET\_LEN}
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Get number of \glspl{LED} in the strip
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& \begin{cmdresp}
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\cfield{u16} number of \glspl{LED}
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\end{cmdresp} \\
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\end{cmdlist}
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