45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
# NeoPixel driver for MicroPython
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# MIT license; Copyright (c) 2016 Damien P. George, 2021 Jim Mussared
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from micropython import const
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from machine import bitstream
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_BITSTREAM_TYPE_HIGH_LOW = const(0)
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_TIMING_WS2818_800 = (400, 850, 800, 450)
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_TIMING_WS2818_400 = (800, 1700, 1600, 900)
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class NeoPixel:
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ORDER = (1, 0, 2, 3)
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def __init__(self, pin, n, bpp=3, timing=1):
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self.pin = pin
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self.n = n
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self.bpp = bpp
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self.buf = bytearray(n * bpp)
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self.pin.init(pin.OUT)
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self.timing = (
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(_TIMING_WS2818_800 if timing else _TIMING_WS2818_400)
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if isinstance(timing, int)
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else timing
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)
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def __len__(self):
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return self.n
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def __setitem__(self, index, val):
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offset = index * self.bpp
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for i in range(self.bpp):
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self.buf[offset + self.ORDER[i]] = val[i]
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def __getitem__(self, index):
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offset = index * self.bpp
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return tuple(self.buf[offset + self.ORDER[i]] for i in range(self.bpp))
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def fill(self, color):
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for i in range(self.n):
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self[i] = color
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def write(self):
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bitstream(self.pin, _BITSTREAM_TYPE_HIGH_LOW, self.timing, self.buf)
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