Ws2812 Led (Neopixel) - Raspberry Pi Pico Python SDK Manual

Raspberry Pi Pico Python SDK
10
11 import
12 from
13 import
14
15
16 @rp2.asm_pio()
17 def wait_pin_low():
18 wrap_target()
19
20 wait(0, pin, 0)
21 irq(block, rel(0))
22 wait(1, pin, 0)
23
24 wrap()
25
26
27 def handler(sm):
28 # Print a (wrapping) timestamp, and the state machine object.
29 print(time.ticks_ms(), sm)
30
31
32 # Instantiate StateMachine(0) with wait_pin_low program on Pin(16).
33 pin16 = Pin(16, Pin.IN, Pin.PULL_UP)
34 sm0 = rp2.StateMachine(0, wait_pin_low, in_base=pin16)
35 sm0.irq(handler)
36
37 # Instantiate StateMachine(1) with wait_pin_low program on Pin(17).
38 pin17 = Pin(17, Pin.IN, Pin.PULL_UP)
39 sm1 = rp2.StateMachine(1, wait_pin_low, in_base=pin17)
40 sm1.irq(handler)
41
42 # Start the StateMachine's running.
43 sm0.active(1)
44 sm1.active(1)
45
46 # Now, when Pin(16) or Pin(17) is pulled low a message will be printed to the REPL.

3.9.2. WS2812 LED (NeoPixel)

While a WS2812 LED (NeoPixel) can be driven via the following program,
Pico MicroPython Examples:
1 # Example using PIO to drive a set of WS2812 LEDs.
2
3 import
4 from
5 import
6
7 # Configure the number of WS2812 LEDs.
8 NUM_LEDS =
9
10
11 @rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True,
pull_thresh=24)
12 def ws2812():
13 T1 =
14 T2 =
15 T3 =
3.9. PIO Support
time
machine import Pin
rp2
https://github.com/raspberrypi/pico-micropython-examples/tree/master/pio/pio_ws2812.py
array, time
machine import Pin
rp2
8
2
5
3
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