kopia lustrzana https://github.com/micropython/micropython
62 wiersze
1.4 KiB
Python
62 wiersze
1.4 KiB
Python
# Example using PIO to drive a set of WS2812 LEDs.
|
|
|
|
# ruff: noqa: F821 - @asm_pio decorator adds names to function scope
|
|
|
|
import array, time
|
|
from machine import Pin
|
|
import rp2
|
|
|
|
# Configure the number of WS2812 LEDs.
|
|
NUM_LEDS = 8
|
|
|
|
|
|
@rp2.asm_pio(
|
|
sideset_init=rp2.PIO.OUT_LOW,
|
|
out_shiftdir=rp2.PIO.SHIFT_LEFT,
|
|
autopull=True,
|
|
pull_thresh=24,
|
|
)
|
|
def ws2812():
|
|
# fmt: off
|
|
T1 = 2
|
|
T2 = 5
|
|
T3 = 3
|
|
wrap_target()
|
|
label("bitloop")
|
|
out(x, 1) .side(0) [T3 - 1]
|
|
jmp(not_x, "do_zero") .side(1) [T1 - 1]
|
|
jmp("bitloop") .side(1) [T2 - 1]
|
|
label("do_zero")
|
|
nop() .side(0) [T2 - 1]
|
|
wrap()
|
|
# fmt: on
|
|
|
|
|
|
# Create the StateMachine with the ws2812 program, outputting on Pin(22).
|
|
sm = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(22))
|
|
|
|
# Start the StateMachine, it will wait for data on its FIFO.
|
|
sm.active(1)
|
|
|
|
# Display a pattern on the LEDs via an array of LED RGB values.
|
|
ar = array.array("I", [0 for _ in range(NUM_LEDS)])
|
|
|
|
# Cycle colours.
|
|
for i in range(4 * NUM_LEDS):
|
|
for j in range(NUM_LEDS):
|
|
r = j * 100 // (NUM_LEDS - 1)
|
|
b = 100 - j * 100 // (NUM_LEDS - 1)
|
|
if j != i % NUM_LEDS:
|
|
r >>= 3
|
|
b >>= 3
|
|
ar[j] = r << 16 | b
|
|
sm.put(ar, 8)
|
|
time.sleep_ms(50)
|
|
|
|
# Fade out.
|
|
for i in range(24):
|
|
for j in range(NUM_LEDS):
|
|
ar[j] = ar[j] >> 1 & 0x7F7F7F
|
|
sm.put(ar, 8)
|
|
time.sleep_ms(50)
|