Fix NeoPixel brightness bug

[jfurcean]

Fixes a bug that prevents brightness from being updated in some cases. I tested this on the QT Rotary Encoder. The test code provided by @kattni.

import time
import board
import busio
from adafruit_seesaw import seesaw, neopixel, rotaryio, digitalio
try:
    import _pixelbuf
except ImportError:
    import adafruit_pypixelbuf as _pixelbuf

i2c = busio.I2C(board.SCL1, board.SDA1)
seesaw = seesaw.Seesaw(i2c, 0x36)

encoder = rotaryio.IncrementalEncoder(seesaw)
switch = digitalio.DigitalIO(seesaw, 24)

pixel = neopixel.NeoPixel(seesaw, 6, 1)

last_position = -1
color = 0  # start at red

while True:
    position = encoder.position
    if position != last_position:
        print(position)
        print(switch.value)
        if switch.value:
            # change the color
            if position > last_position:  # increase
                color += 1
            else:
                color -= 1
            color = (color + 256) % 256  # wrap around to 0-256
            pixel.fill(_pixelbuf.colorwheel(color))
        else:
            # change the brightness
            if position > last_position:  # increase
                pixel.brightness = min(1.0, pixel.brightness + 0.1)
            else:
                pixel.brightness = max(0, pixel.brightness - 0.1)
    last_position = position

[kattni]

Thanks for the update! I didn't even get a chance to file the issue!

[kattni]

Tested successfully.