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71 lines
1.8 KiB
71 lines
1.8 KiB
\section{NPX: NeoPixel}
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The NeoPixel unit implements the protocol needed to control a digital LED strip with WS2812, WS2811, or compatible LED driver chips. The protocol timing is implemented in software, therefore it is available on any GPIO pin of the module.
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The color data can be loaded in five different format: as packed bytes, or as the little-endian or big-endian encoding of colors in the 32-bit format 0x00RRGGBB or 0x00BBGGRR. This data format is convenient when the colors are already represented by an array of 32-bit integers.
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\subsection{NPX 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{NPX Events}
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This unit generates no events.
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\subsection{NPX Commands}
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\begin{tabularx}{\textwidth}{p{\fldwcode}lXp{\fldwpld}}
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\toprule
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\textbf{Code} & \textbf{Name} & \textbf{Function} & \textbf{Payload} \\
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\midrule
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0x00 & CLEAR & Switch all LEDs off (sets them to black) & \\
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0x01 & LOAD & Load a sequence of R,G,B bytes
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& \makecell[tl]{
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\fldreq
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\tabitem For each LED: \\
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~~\fldo{u8} red \\
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~~\fldo{u8} green \\
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~~\fldo{u8} blue \\
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} \\
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0x08 & LOAD\_U32\_ZRGB & Load 32-bit big-endian 0xRRGGBB (0,R,G,B)
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& \makecell[tl]{
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\fldreq
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\fld{u32[]} color data BE
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} \\
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0x09 & LOAD\_U32\_ZBGR & Load 32-bit big-endian 0xBBGGRR (0,B,G,R)
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& \makecell[tl]{
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\fldreq
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\fld{u32[]} color data BE
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} \\
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0x0A & LOAD\_U32\_RGBZ & Load 32-bit little-endian 0xBBGGRR (R,G,B,0)
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& \makecell[tl]{
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\fldreq
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\fld{u32[]} color data LE
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} \\
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0x0B & LOAD\_U32\_BGRZ & Load 32-bit little-endian 0xRRGGBB (B,G,R,0)
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& \makecell[tl]{
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\fldreq
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\fld{u32[]} color data LE
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} \\
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0x10 & GET\_LEN & Get number of LEDs in the strip
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& \makecell[tl]{
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\fldresp
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\fld{u16} number of LEDs
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} \\
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\bottomrule
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\end{tabularx}
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