from pyb import Pin
pin = Pin(«BTNA», pull=Pin.PULL_UP)
print(pin.value())

import board, digitalio
pin = digitalio.DigitalInOut(board.BTNA)
pin.pull = digitalio.Pull.UP
print(pin.value)

from pyb import Pin, Timer, delay
# нужные номера таймера и канала
# берутся из даташита
tim = Timer(4, freq=440)
ch = tim.channel(3, Timer.PWM,
                 pin=Pin('BUZZ'),
                 pulse_width=15909)
                 # 50% от 14 MHz / 440
delay(100)
ch.pulse_width_percent(0)

import board, pwmio, time
pwm = pwmio.PWMOut(board.BUZZ,
                   frequency=440,
                   duty_cycle=2**15)
                   # 50% от  2**16
time.sleep(0.1)
pwm.duty_cycle = 0

import pyb, framebuf
fbuf = bytearray(160*128*2)
fb = framebuf.FrameBuffer(fbuf, 160, 128,
                          framebuf.RGB565)
tft = pyb.SCREEN()
fb.pixel(123, 45, 0x07E0) # blue
tft.show(fb)

import board, displayio
fb = displayio.Bitmap(160, 128, 2)
palette = displayio.Palette(2)
palette[1] = 0xFF0000 # blue
splash = displayio.Group()
splash.append(displayio.TileGrid(fb,
              pixel_shader=palette))
tft = board.DISPLAY
tft.show(splash)
fb[123, 45] = 1
tft.refresh()

# `tim` и `ch` как в примере выше
music = []
countdown = 0
next = 0
# понимает подмножество синтаксиса QBasic PLAY:
# https://en.wikibooks.org/wiki/QBasic/Appendix#PLAY
def play(m):
    global music, next
    music = music[next:]
    next = 0
    octave = 1
    duration = 75
    n = 0
    while n < len(m):
        note = m[n]
        if note >= 'A' and note <= 'G':
            freq = [440, 494, 262, 294, 330, 349, 392][ord(note)-ord('A')]
            music.append((freq * 2 ** (octave-1), duration * 7 / 8))
            music.append((0, duration / 8))
        elif note == 'O':
            n += 1
            octave = int(m[n])
        elif note == 'L':
            n += 2
            l = int(m[n-1:n+1])
            duration = 1500 / l
        n += 1
def handle_music(t):
  global countdown, next
  if countdown:
    countdown -= 1
    if countdown:
      return
    ch.pulse_width_percent(0)
  if next < len(music):
    (freq, countdown) = music[next]
    next += 1
    if freq:
      tim.freq(freq)
      ch.pulse_width_percent(50)
bg_tim = Timer(1, freq=1000)
bg_tim.callback(handle_music)

# `pwm` как в примере выше
def sleep(duration):
  until = monotonic_ns() + duration
  while monotonic_ns() < until:
    yield
def handle_music():
  global music
  while True:
    if music:
      (freq, d) = music[0]
      music = music[1:]
      if freq:
        pwm.frequency = int(freq)
        pwm.duty_cycle = 2**15
      yield from sleep(d * 1.e6)
      pwm.duty_cycle = 0
    yield

play("L08CDEDCDL04ECC")
def scroll():
  while True:
    while splash.y > max_scroll:
      splash.y -= 1
      yield from sleep(3.e8)
    while splash.y < 0:
      splash.y += 1
      yield from sleep(3.e8)
def handle_input():
  while all(button.value for button in buttons):
    yield
for _ in zip(scroll(), handle_input(), handle_music()):
  pass