def _play_to_pin(tune, base_tone, min_freq, duration, octave, tempo):
"""Using the prepared input send the notes to the pin
"""
pwm = isinstance(base_tone, pulseio.PWMOut)
for note in tune.split(","):
piano_note, note_duration = _parse_note(note, duration, octave)
if piano_note in PIANO:
if pwm:
base_tone.frequency = int(PIANO[piano_note])
base_tone.duty_cycle = 2**15
else:
# AudioOut interface changed in CP 3.x
if sys.implementation.version[0] >= 3:
pitch = int(PIANO[piano_note])
sine_wave = sine.sine_wave(16000, pitch)
sine_wave_sample = audioio.RawSample(sine_wave)
base_tone.play(sine_wave_sample, loop=True)
else:
base_tone.frequency = int(16000 *
(PIANO[piano_note] / min_freq))
base_tone.play(loop=True)
time.sleep(4 / note_duration * 60 / tempo)
if pwm:
base_tone.duty_cycle = 0
else:
base_tone.stop()
time.sleep(0.02)
def _play_to_pin(tune, base_tone, min_freq, duration, octave, tempo):
"""Using the prepared input send the notes to the pin
"""
pwm = isinstance(base_tone, pulseio.PWMOut)
for note in tune.split(","):
piano_note, note_duration = _parse_note(note, duration, octave)
if piano_note in PIANO:
if pwm:
base_tone.frequency = int(PIANO[piano_note])
base_tone.duty_cycle = 2 ** 15
else:
# AudioOut interface changed in CP 3.x
if sys.implementation.version[0] >= 3:
pitch = int(PIANO[piano_note])
sine_wave = sine.sine_wave(16000, pitch)
sine_wave_sample = audioio.RawSample(sine_wave)
base_tone.play(sine_wave_sample, loop=True)
else:
base_tone.frequency = int(
16000 * (PIANO[piano_note] / min_freq))
base_tone.play(loop=True)
time.sleep(4 / note_duration * 60 / tempo)
if pwm:
base_tone.duty_cycle = 0
else:
base_tone.stop()
time.sleep(0.02)
def play(pin, rtttl, octave=None, duration=None, tempo=None):
_, defaults, tune = rtttl.split(":")
for default in defaults.split(","):
if default[0] == "d" and not duration:
duration = int(default[2:])
elif default[0] == "o" and not octave:
octave = default[2:]
elif default[0] == "b" and not tempo:
tempo = int(default[2:])
if not octave:
octave = 6
if not duration:
duration = 4
if not tempo:
tempo = 63
print("tempo", tempo, "octave", octave, "duration", duration)
min_freq = 13000
for note in tune.split(","):
p = None
if note[0].isdigit():
p = note[1]
else:
p = note[0]
if "#" in note:
p += "#"
o = octave
if note[-1].isdigit():
o = note[-1]
p = o + p
if p[-1] != "p" and piano[p] < min_freq:
min_freq = piano[p]
wave = sine.sine_wave(16000, min_freq)
base_tone = audioio.AudioOut(pin, wave)
for note in tune.split(","):
p = None
d = duration
if note[0].isdigit():
d = int(note[0])
p = note[1]
else:
p = note[0]
if "." in note:
d *= 1.5
if "#" in note:
p += "#"
o = octave
if note[-1].isdigit():
o = note[-1]
p = o + p
if p in piano:
base_tone.frequency = int(16000 * (piano[p] / min_freq))
base_tone.play(loop=True)
print(p, d)
time.sleep(4 / d * 60 / tempo)
base_tone.stop()
time.sleep(0.02)
def _get_wave(tune, octave):
"""Returns the proper waveform to play the song along with the minimum
frequency in the song.
"""
min_freq = 13000
for note in tune.split(","):
piano_note, _ = _parse_note(note, octave=octave)
if piano_note[-1] != "p" and PIANO[piano_note] < min_freq:
min_freq = PIANO[piano_note]
return sine.sine_wave(16000, min_freq), min_freq
def _get_wave(tune, octave):
"""Returns the proper waveform to play the song along with the minimum
frequency in the song.
"""
min_freq = 13000
for note in tune.split(","):
piano_note, _ = _parse_note(note, octave=octave)
if piano_note[-1] != "p" and PIANO[piano_note] < min_freq:
min_freq = PIANO[piano_note]
return sine.sine_wave(16000, min_freq), min_freq
def _get_wave(tune, octave):
"""Returns the proper waveform to play the song along with the minimum
frequency in the song.
"""
min_freq = 13000
for note in tune.split(","):
piano_note = None
if note[0].isdigit():
piano_note = note[1]
else:
piano_note = note[0]
if "#" in note:
piano_note += "#"
note_octave = octave
if note[-1].isdigit():
note_octave = note[-1]
piano_note = note_octave + piano_note
if piano_note[-1] != "p" and PIANO[piano_note] < min_freq:
min_freq = PIANO[piano_note]
return sine.sine_wave(16000, min_freq), min_freq
"""
'sine_demo.py'.
=================================================
toggles the builtin LED using a sine wave
"""
import time
import board
import digitalio
from adafruit_waveform import sine
LED = digitalio.DigitalInOut(board.D13)
LED.switch_to_output()
SINE_SAMPLE = sine.sine_wave(150, 50)
while True:
for i in range(len(SINE_SAMPLE)):
LED.value = i
print(LED.value)
time.sleep(0.50)
# Old Crow's MIDICV with CC in CircuitPython # 20 FEB 2018 21:46 import digitalio import audioio import board import time import busio import adafruit_ssd1306 import analogio from adafruit_waveform import sine # Create 440Hz sine tone sample and assign to feather's DAC FREQUENCY = 440 # 440 Hz middle 'A' SAMPLERATE = 8000 # 8000 samples/second, recommended! wave = sine.sine_wave(SAMPLERATE, FREQUENCY) a440 = audioio.AudioOut(board.A0, wave) a440.frequency = SAMPLERATE # Initialize MIDI engine states midiRunningStatus = 0 midiState = 0 midiNoteBufferIndex = 0 midiNoteBuffer = [128, 128, 128, 128, 128, 128, 128, 128, 128, 128] midiNoteToRemove = 255 # Set up MCP4922 dual DAC daccs = digitalio.DigitalInOut(board.A5) # A5 is DAC CS spi = busio.SPI(board.SCK, board.MOSI) from adafruit_bus_device.spi_device import SPIDevice mcp4922 = SPIDevice(spi, daccs, baudrate=8000000, polarity=0, phase=0)