366 lines
No EOL
14 KiB
Python
366 lines
No EOL
14 KiB
Python
import array, time
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from machine import Pin
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import rp2
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# PIO state machine for RGB. Pulls 24 bits (rgb -> 3 * 8bit) automatically
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@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=24)
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def ws2812():
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T1 = 2
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T2 = 5
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T3 = 3
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wrap_target()
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label("bitloop")
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out(x, 1) .side(0) [T3 - 1]
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jmp(not_x, "do_zero") .side(1) [T1 - 1]
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jmp("bitloop") .side(1) [T2 - 1]
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label("do_zero")
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nop() .side(0) [T2 - 1]
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wrap()
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# PIO state machine for RGBW. Pulls 32 bits (rgbw -> 4 * 8bit) automatically
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@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=32)
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def sk6812():
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T1 = 2
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T2 = 5
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T3 = 3
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wrap_target()
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label("bitloop")
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out(x, 1) .side(0) [T3 - 1]
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jmp(not_x, "do_zero") .side(1) [T1 - 1]
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jmp("bitloop") .side(1) [T2 - 1]
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label("do_zero")
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nop() .side(0) [T2 - 1]
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wrap()
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# we need this because Micropython can't construct slice objects directly, only by
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# way of supporting slice notation.
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# So, e.g. slice_maker[1::4] gives a slice(1,None,4) object.
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class slice_maker_class:
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def __getitem__(self, slc):
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return slc
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slice_maker = slice_maker_class()
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# Delay here is the reset time. You need a pause to reset the LED strip back to the initial LED
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# however, if you have quite a bit of processing to do before the next time you update the strip
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# you could put in delay=0 (or a lower delay)
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#
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# Class supports different order of individual colors (GRB, RGB, WRGB, GWRB ...). In order to achieve
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# this, we need to flip the indexes: in 'RGBW', 'R' is on index 0, but we need to shift it left by 3 * 8bits,
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# so in it's inverse, 'WBGR', it has exactly right index. Since micropython doesn't have [::-1] and recursive rev()
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# isn't too efficient we simply do that by XORing (operator ^) each index with 3 (0b11) to make this flip.
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# When dealing with just 'RGB' (3 letter string), this means same but reduced by 1 after XOR!.
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# Example: in 'GRBW' we want final form of 0bGGRRBBWW, meaning G with index 0 needs to be shifted 3 * 8bit ->
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# 'G' on index 0: 0b00 ^ 0b11 -> 0b11 (3), just as we wanted.
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# Same hold for every other index (and - 1 at the end for 3 letter strings).
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class Neopixel:
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# Micropython doesn't implement __slots__, but it's good to have a place
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# to describe the data members...
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# __slots__ = [
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# 'num_leds', # number of LEDs
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# 'pixels', # array.array('I') of raw data for LEDs
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# 'mode', # mode 'RGB' etc
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# 'W_in_mode', # bool: is 'W' in mode
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# 'sm', # state machine
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# 'shift', # shift amount for each component, in a tuple for (R,B,G,W)
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# 'delay', # delay amount
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# 'brightnessvalue', # brightness scale factor 1..255
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# ]
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def __init__(self, num_leds, state_machine, pin, mode="RGB", delay=0.0003):
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"""
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Constructor for library class
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:param num_leds: number of leds on your led-strip
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:param state_machine: id of PIO state machine used
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:param pin: pin on which data line to led-strip is connected
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:param mode: [default: "RGB"] mode and order of bits representing the color value.
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This can be any order of RGB or RGBW (neopixels are usually GRB)
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:param delay: [default: 0.0001] delay used for latching of leds when sending data
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"""
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self.pixels = array.array("I", [0] * num_leds)
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self.mode = mode
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self.W_in_mode = 'W' in mode
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if self.W_in_mode:
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# RGBW uses different PIO state machine configuration
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self.sm = rp2.StateMachine(state_machine, sk6812, freq=8000000, sideset_base=Pin(pin))
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# tuple of values required to shift bit into position (check class desc.)
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self.shift = ((mode.index('R') ^ 3) * 8, (mode.index('G') ^ 3) * 8,
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(mode.index('B') ^ 3) * 8, (mode.index('W') ^ 3) * 8)
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else:
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self.sm = rp2.StateMachine(state_machine, ws2812, freq=8000000, sideset_base=Pin(pin))
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self.shift = (((mode.index('R') ^ 3) - 1) * 8, ((mode.index('G') ^ 3) - 1) * 8,
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((mode.index('B') ^ 3) - 1) * 8, 0)
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self.sm.active(1)
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self.num_leds = num_leds
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self.delay = delay
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self.brightnessvalue = 255
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def brightness(self, brightness=None):
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"""
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Set the overall value to adjust brightness when updating leds
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or return class brightnessvalue if brightness is None
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:param brightness: [default: None] Value of brightness on interval 1..255
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:return: class brightnessvalue member or None
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"""
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if brightness is None:
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return self.brightnessvalue
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else:
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if brightness < 1:
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brightness = 1
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if brightness > 255:
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brightness = 255
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self.brightnessvalue = brightness
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def set_pixel_line_gradient(self, pixel1, pixel2, left_rgb_w, right_rgb_w, how_bright=None):
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"""
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Create a gradient with two RGB colors between "pixel1" and "pixel2" (inclusive)
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:param pixel1: Index of starting pixel (inclusive)
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:param pixel2: Index of ending pixel (inclusive)
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:param left_rgb_w: Tuple of form (r, g, b) or (r, g, b, w) representing starting color
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:param right_rgb_w: Tuple of form (r, g, b) or (r, g, b, w) representing ending color
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:param how_bright: [default: None] Brightness of current interval. If None, use global brightness value
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:return: None
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"""
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if pixel2 - pixel1 == 0:
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return
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right_pixel = max(pixel1, pixel2)
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left_pixel = min(pixel1, pixel2)
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with_W = len(left_rgb_w) == 4 and self.W_in_mode
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r_diff = right_rgb_w[0] - left_rgb_w[0]
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g_diff = right_rgb_w[1] - left_rgb_w[1]
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b_diff = right_rgb_w[2] - left_rgb_w[2]
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if with_W:
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w_diff = (right_rgb_w[3] - left_rgb_w[3])
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for i in range(right_pixel - left_pixel + 1):
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fraction = i / (right_pixel - left_pixel)
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red = round(r_diff * fraction + left_rgb_w[0])
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green = round(g_diff * fraction + left_rgb_w[1])
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blue = round(b_diff * fraction + left_rgb_w[2])
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# if it's (r, g, b, w)
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if with_W:
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white = round(w_diff * fraction + left_rgb_w[3])
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self.set_pixel(left_pixel + i, (red, green, blue, white), how_bright)
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else:
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self.set_pixel(left_pixel + i, (red, green, blue), how_bright)
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def set_pixel_line(self, pixel1, pixel2, rgb_w, how_bright=None):
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"""
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Set an array of pixels starting from "pixel1" to "pixel2" (inclusive) to the desired color.
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:param pixel1: Index of starting pixel (inclusive)
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:param pixel2: Index of ending pixel (inclusive)
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:param rgb_w: Tuple of form (r, g, b) or (r, g, b, w) representing color to be used
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:param how_bright: [default: None] Brightness of current interval. If None, use global brightness value
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:return: None
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"""
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if pixel2 >= pixel1:
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self.set_pixel(slice_maker[pixel1:pixel2 + 1], rgb_w, how_bright)
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def set_pixel(self, pixel_num, rgb_w, how_bright=None):
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"""
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Set red, green and blue (+ white) value of pixel on position <pixel_num>
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pixel_num may be a 'slice' object, and then the operation is applied
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to all pixels implied by the slice (most useful when called via __setitem__)
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:param pixel_num: Index of pixel to be set or slice object representing multiple leds
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:param rgb_w: Tuple of form (r, g, b) or (r, g, b, w) representing color to be used
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:param how_bright: [default: None] Brightness of current interval. If None, use global brightness value
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:return: None
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"""
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if how_bright is None:
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how_bright = self.brightness()
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sh_R, sh_G, sh_B, sh_W = self.shift
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bratio = how_bright / 255.0
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red = round(rgb_w[0] * bratio)
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green = round(rgb_w[1] * bratio)
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blue = round(rgb_w[2] * bratio)
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white = 0
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# if it's (r, g, b, w)
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if len(rgb_w) == 4 and self.W_in_mode:
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white = round(rgb_w[3] * bratio)
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pix_value = white << sh_W | blue << sh_B | red << sh_R | green << sh_G
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# set some subset, if pixel_num is a slice:
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if type(pixel_num) is slice:
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for i in range(*pixel_num.indices(self.num_leds)):
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self.pixels[i] = pix_value
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else:
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self.pixels[pixel_num] = pix_value
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def get_pixel(self, pixel_num):
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"""
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Get red, green, blue and white (if applicable) values of pixel on position <pixel_num>
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:param pixel_num: Index of pixel to be set
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:return rgb_w: Tuple of form (r, g, b) or (r, g, b, w) representing color to be used
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"""
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balance = self.pixels[pixel_num]
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sh_R, sh_G, sh_B, sh_W = self.shift
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if self.W_in_mode:
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w = (balance >> sh_W) & 255
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b = (balance >> sh_B) & 255
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r = (balance >> sh_R) & 255
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g = (balance >> sh_G) & 255
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red = int(r * 255 / self.brightness() )
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green = int(g * 255 / self.brightness() )
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blue = int(b * 255 / self.brightness() )
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if self.W_in_mode:
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white = int(w * 255 / self.brightness() )
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return (red,green,blue,white)
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else:
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return (red,green,blue)
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def __setitem__(self, idx, rgb_w):
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"""
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if npix is a Neopixel object,
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npix[10] = (0,255,0) # <- sets #10 to green
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npix[15:21] = (255,0,0) # <- sets 16,17 .. 20 to red
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npix[21:29:2] = (0,0,255) # <- sets 21,23,25,27 to blue
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npix[1::2] = (0,0,0) # <- sets all odd pixels to 'off'
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npix[:] = [(0,5,0),(0,5,0)] # <- replaces all pixels with those from the array
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(the 'slice' cases pass idx as a 'slice' object, and
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set_pixel processes the slice)
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:param idx: Index can either be indexing number or slice
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:param rgb_w: Tuple (or list of tuples) of form (r, g, b) or (r, g, b, w) representing color to be used
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:return: None
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"""
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if type(rgb_w) is list:
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# set some subset, if idx is a slice:
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if type(idx) is slice:
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for rgb_i, pixel_i in enumerate(range(*idx.indices(self.num_leds))):
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self.set_pixel(pixel_i, rgb_w[rgb_i])
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else:
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raise ValueError("Index must be a slice when setting multiple pixels as list")
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else:
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self.set_pixel(idx, rgb_w)
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def __len__(self):
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return self.num_leds
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def __getitem__(self, idx):
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return self.get_pixel(idx)
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def colorHSV(self, hue, sat, val):
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"""
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Converts HSV color to rgb tuple and returns it.
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The logic is almost the same as in Adafruit NeoPixel library:
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https://github.com/adafruit/Adafruit_NeoPixel so all the credits for that
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go directly to them (license: https://github.com/adafruit/Adafruit_NeoPixel/blob/master/COPYING)
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:param hue: Hue component. Should be on interval 0..65535
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:param sat: Saturation component. Should be on interval 0..255
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:param val: Value component. Should be on interval 0..255
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:return: (r, g, b) tuple
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"""
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if hue >= 65536:
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hue %= 65536
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hue = (hue * 1530 + 32768) // 65536
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if hue < 510:
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b = 0
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if hue < 255:
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r = 255
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g = hue
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else:
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r = 510 - hue
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g = 255
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elif hue < 1020:
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r = 0
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if hue < 765:
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g = 255
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b = hue - 510
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else:
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g = 1020 - hue
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b = 255
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elif hue < 1530:
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g = 0
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if hue < 1275:
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r = hue - 1020
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b = 255
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else:
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r = 255
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b = 1530 - hue
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else:
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r = 255
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g = 0
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b = 0
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v1 = 1 + val
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s1 = 1 + sat
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s2 = 255 - sat
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r = ((((r * s1) >> 8) + s2) * v1) >> 8
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g = ((((g * s1) >> 8) + s2) * v1) >> 8
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b = ((((b * s1) >> 8) + s2) * v1) >> 8
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return r, g, b
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def rotate_left(self, num_of_pixels=None):
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"""
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Rotate <num_of_pixels> pixels to the left
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:param num_of_pixels: Number of pixels to be shifted to the left. If None, it shifts for 1.
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:return: None
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"""
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if num_of_pixels is None:
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num_of_pixels = 1
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self.pixels = self.pixels[num_of_pixels:] + self.pixels[:num_of_pixels]
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def rotate_right(self, num_of_pixels=None):
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"""
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Rotate <num_of_pixels> pixels to the right
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:param num_of_pixels: Number of pixels to be shifted to the right. If None, it shifts for 1.
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:return: None
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"""
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if num_of_pixels is None:
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num_of_pixels = 1
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num_of_pixels = -1 * num_of_pixels
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self.pixels = self.pixels[num_of_pixels:] + self.pixels[:num_of_pixels]
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def show(self):
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"""
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Send data to led-strip, making all changes on leds have an effect.
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This method should be used after every method that changes the state of leds or after a chain of changes.
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:return: None
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"""
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# If mode is RGB, we cut 8 bits of, otherwise we keep all 32
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cut = 8
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if self.W_in_mode:
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cut = 0
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self.sm.put(self.pixels, cut)
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time.sleep(self.delay)
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def fill(self, rgb_w, how_bright=None):
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"""
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Fill the entire strip with color rgb_w
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:param rgb_w: Tuple of form (r, g, b) or (r, g, b, w) representing color to be used
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:param how_bright: [default: None] Brightness of current interval. If None, use global brightness value
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:return: None
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"""
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# set_pixel over all leds.
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self.set_pixel(slice_maker[:], rgb_w, how_bright)
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def clear(self):
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"""
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Clear the entire strip, i.e. set every led color to 0.
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:return: None
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"""
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self.pixels = array.array("I", [0] * self.num_leds) |