micropython/drivers: Move "neopixel" led driver from main repo.

Signed-off-by: Jim Mussared <[email protected]>

Author: jimmo

micropython/drivers/led/neopixel/manifest.py

@@ -0,0 +1 @@
+module("neopixel.py", opt=3)

micropython/drivers/led/neopixel/neopixel.py

@@ -0,0 +1,50 @@
+# NeoPixel driver for MicroPython
+# MIT license; Copyright (c) 2016 Damien P. George, 2021 Jim Mussared
+
+from machine import bitstream
+
+
+class NeoPixel:
+    # G R B W
+    ORDER = (1, 0, 2, 3)
+
+    def __init__(self, pin, n, bpp=3, timing=1):
+        self.pin = pin
+        self.n = n
+        self.bpp = bpp
+        self.buf = bytearray(n * bpp)
+        self.pin.init(pin.OUT)
+        # Timing arg can either be 1 for 800kHz or 0 for 400kHz,
+        # or a user-specified timing ns tuple (high_0, low_0, high_1, low_1).
+        self.timing = (
+            ((400, 850, 800, 450) if timing else (800, 1700, 1600, 900))
+            if isinstance(timing, int)
+            else timing
+        )
+
+    def __len__(self):
+        return self.n
+
+    def __setitem__(self, i, v):
+        offset = i * self.bpp
+        for i in range(self.bpp):
+            self.buf[offset + self.ORDER[i]] = v[i]
+
+    def __getitem__(self, i):
+        offset = i * self.bpp
+        return tuple(self.buf[offset + self.ORDER[i]] for i in range(self.bpp))
+
+    def fill(self, v):
+        b = self.buf
+        l = len(self.buf)
+        bpp = self.bpp
+        for i in range(bpp):
+            c = v[i]
+            j = self.ORDER[i]
+            while j < l:
+                b[j] = c
+                j += bpp
+
+    def write(self):
+        # BITSTREAM_TYPE_HIGH_LOW = 0
+        bitstream(self.pin, 0, self.timing, self.buf)