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March 11, 2021 18:32
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# ========== DESCRIPTION========== | |
# Example using PIO to drive a set of WS2812 LEDs. | |
# | |
# The following code was originally written by | |
# the Raspberry Pi Foundation. You can find this | |
# example on GitHub. | |
# | |
# https://github.com/raspberrypi/pico-micropython-examples/blob/master/pio/neopixel_ring/neopixel_ring.py | |
# | |
# Note that the 'NUM_LEDs' was adjusted to 1. Also | |
# the GPIO for the addressable WS2812 RGB LED called | |
# `PIN_NUM` was adjusted for the Pro Micro RP2040. | |
import array, time | |
from machine import Pin | |
import rp2 | |
# Configure the number of WS2812 LEDs. | |
NUM_LEDS = 1 | |
PIN_NUM = 25 | |
brightness = 0.2 | |
@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=24) | |
def ws2812(): | |
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() | |
# Create the StateMachine with the ws2812 program, outputting on pin | |
sm = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(PIN_NUM)) | |
# 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)]) | |
########################################################################## | |
def pixels_show(): | |
dimmer_ar = array.array("I", [0 for _ in range(NUM_LEDS)]) | |
for i,c in enumerate(ar): | |
r = int(((c >> 8) & 0xFF) * brightness) | |
g = int(((c >> 16) & 0xFF) * brightness) | |
b = int((c & 0xFF) * brightness) | |
dimmer_ar[i] = (g<<16) + (r<<8) + b | |
sm.put(dimmer_ar, 8) | |
time.sleep_ms(10) | |
def pixels_set(i, color): | |
ar[i] = (color[1]<<16) + (color[0]<<8) + color[2] | |
def pixels_fill(color): | |
for i in range(len(ar)): | |
pixels_set(i, color) | |
def color_chase(color, wait): | |
for i in range(NUM_LEDS): | |
pixels_set(i, color) | |
time.sleep(wait) | |
pixels_show() | |
time.sleep(0.2) | |
def wheel(pos): | |
# Input a value 0 to 255 to get a color value. | |
# The colours are a transition r - g - b - back to r. | |
if pos < 0 or pos > 255: | |
return (0, 0, 0) | |
if pos < 85: | |
return (255 - pos * 3, pos * 3, 0) | |
if pos < 170: | |
pos -= 85 | |
return (0, 255 - pos * 3, pos * 3) | |
pos -= 170 | |
return (pos * 3, 0, 255 - pos * 3) | |
def rainbow_cycle(wait): | |
for j in range(255): | |
for i in range(NUM_LEDS): | |
rc_index = (i * 256 // NUM_LEDS) + j | |
pixels_set(i, wheel(rc_index & 255)) | |
pixels_show() | |
time.sleep(wait) | |
BLACK = (0, 0, 0) | |
RED = (255, 0, 0) | |
YELLOW = (255, 150, 0) | |
GREEN = (0, 255, 0) | |
CYAN = (0, 255, 255) | |
BLUE = (0, 0, 255) | |
PURPLE = (180, 0, 255) | |
WHITE = (255, 255, 255) | |
COLORS = (BLACK, RED, YELLOW, GREEN, CYAN, BLUE, PURPLE, WHITE) | |
print("fills") | |
for color in COLORS: | |
pixels_fill(color) | |
pixels_show() | |
time.sleep(0.2) | |
print("chases") | |
for color in COLORS: | |
color_chase(color, 0.01) | |
while True: | |
print("rainbow") | |
rainbow_cycle(0) |
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