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Revision to M150

David Crocker

* ***Xn*** LED type: X0 = DotStar (default prior to RRF 3.2), X1 = RGB NeoPixel (default in RRF 3.2 and later), X2 = bit-banged RGB NeoPixel, X3 = RGBW NeoPixel (from RRF 3.3), X4 = bit-banged RGBW NeoPixel (from RRF3). This parameter is remembered from one call to the next, so it only needs to be given once. Not all boards support all the modes. On the Duet 3 Mini, X1 selects the NeoPixel output on the main board, and X2 addresses the RGB LEDs on some 12864 displays.
* ***Ynn*** 'Brightness, 0-31 (alternative to P 0-255)
-* ***Qnnn*** (optional) Use specified SPI frequency (in Hz) instead of the default frequency. This parameter is ont normally needed, and is only processed if X parameter also present. When using NeoPixels, only frequencies in the range 2.4 to 4MHz will work.
+* ***Qnnn*** (optional) Use specified SPI frequency (in Hz) instead of the default frequency. This parameter is not normally needed, and is only processed if X parameter also present. When using NeoPixels, only frequencies in the range 2.4 to 4MHz will work.
***Example***

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