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 parse-bytecode

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neopixel.py

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import time

import machine

from esp import neopixel_write

class NeoPixel:

def __init__(self, pin, n):

self.pin = pin

self.n = n

self.buf = bytearray(n * 3)

def __setitem__(self, index, val):

r, g, b = val

self.buf[index * 3] = g

self.buf[index * 3 + 1] = r

self.buf[index * 3 + 2] = b

def __getitem__(self, index):

i = index * 3

return self.buf[i], self.buf[i + 1], self.buf[i + 2]

def write(self):

neopixel_write(self.pin, self.buf, True)

def test():

# put a neopixel strip on GPIO4

p = machine.Pin(4, machine.Pin.OUT)

np = NeoPixel(p, 8)

n = np.n

# cycle

for i in range(4 * n):

for j in range(n):

np[j] = (0, 0, 0)

np[i % n] = (255, 255, 255)

np.write()

time.sleep_ms(25)

# bounce

for i in range(4 * n):

for j in range(n):

np[j] = (0, 0, 128)

if (i // n) % 2 == 0:

np[i % n] = (0, 0, 0)

else:

np[n - 1 - (i % n)] = (0, 0, 0)

np.write()

time.sleep_ms(60)

# fade in/out

for i in range(0, 4 * 256, 8):

for j in range(n):

if (i // 256) % 2 == 0:

val = i & 0xff

else:

val = 255 - (i & 0xff)

np[j] = (val, 0, 0)

np.write()

# clear

for i in range(n):

np[i] = (0, 0, 0)

np.write()

test()