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80 lines
1.9 KiB
Python
80 lines
1.9 KiB
Python
"""ILI9341 demo (color wheel)."""
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from time import sleep
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from ili9341 import Display, color565
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from machine import Pin, SPI
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from math import cos, pi, sin
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HALF_WIDTH = const(120)
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HALF_HEIGHT = const(160)
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CENTER_X = const(119)
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CENTER_Y = const(159)
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ANGLE_STEP_SIZE = 0.05 # Decrease step size for higher resolution
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PI2 = pi * 2
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def hsv_to_rgb(h, s, v):
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"""
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Convert HSV to RGB (based on colorsys.py).
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Args:
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h (float): Hue 0 to 1.
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s (float): Saturation 0 to 1.
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v (float): Value 0 to 1 (Brightness).
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"""
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if s == 0.0:
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return v, v, v
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i = int(h * 6.0)
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f = (h * 6.0) - i
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p = v * (1.0 - s)
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q = v * (1.0 - s * f)
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t = v * (1.0 - s * (1.0 - f))
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i = i % 6
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v = int(v * 255)
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t = int(t * 255)
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p = int(p * 255)
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q = int(q * 255)
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if i == 0:
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return v, t, p
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if i == 1:
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return q, v, p
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if i == 2:
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return p, v, t
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if i == 3:
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return p, q, v
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if i == 4:
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return t, p, v
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if i == 5:
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return v, p, q
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def test():
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"""Test code."""
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# Baud rate of 40000000 seems about the max
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spi = SPI(1, baudrate=40000000, sck=Pin(14), mosi=Pin(13))
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display = Display(spi, dc=Pin(4), cs=Pin(16), rst=Pin(17))
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x, y = 0, 0
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angle = 0.0
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# Loop all angles from 0 to 2 * PI radians
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while angle < PI2:
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# Calculate x, y from a vector with known length and angle
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x = int(CENTER_X * sin(angle) + HALF_WIDTH)
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y = int(CENTER_Y * cos(angle) + HALF_HEIGHT)
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color = color565(*hsv_to_rgb(angle / PI2, 1, 1))
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display.draw_line(x, y, CENTER_X, CENTER_Y, color)
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angle += ANGLE_STEP_SIZE
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sleep(5)
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for r in range(CENTER_X, 0, -1):
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color = color565(*hsv_to_rgb(r / HALF_WIDTH, 1, 1))
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display.fill_circle(CENTER_X, CENTER_Y, r, color)
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sleep(9)
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display.cleanup()
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test()
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