import board
import busio
from audiocore import WaveFile
try:
from audioio import AudioOut
except ImportError:
from audiopwmio import PWMAudioOut as AudioOut
from audiomixer import Mixer
### Using mixer is a workaround for the nRF52840 PWMAudioOut
### not implementing the quiescent_value after a sample
### has completed playing
mixer = Mixer(voice_count=2,
sample_rate=16000,
channel_count=2,
bits_per_sample=16,
samples_signed=True)
wav_files = ("scanner-left-16k.wav", "scanner-right-16k.wav")
### Use same pins which would be used on a Feather M4 with real DACs
AUDIO_PIN_L = board.A0
AUDIO_PIN_R = board.A1
audio_out = AudioOut(AUDIO_PIN_L, right_channel=AUDIO_PIN_R)
wav_fh = [open(fn, "rb") for fn in wav_files]
wavs = [WaveFile(fh) for fh in wav_fh]
### Voice 0 behaves strangely
### https://github.com/adafruit/circuitpython/issues/3210
samples_per_waveform = 16
c_waves = 128
buffer_size = c_waves * samples_per_waveform
twopi = 2 * math.pi
a4_hz = 440
a4_st = 9 ### 9 st above C
### TODO - could print error from exact rate or could do this more universally
### This is the sample playback rate for playing the first sample at C4 frequency
rate = round(a4_hz / st_mult[a4_st] * samples_per_waveform)
### voice 0 seems to be louder than the rest, not using it
mixer = Mixer(voice_count=len(st_mult) + 1,
sample_rate=rate,
channel_count=1,
bits_per_sample=16,
samples_signed=False)
### quiet audible click as this initialises
audio.play(mixer)
### Create samples for each note (semitone) from C4 to C5
note_samples = []
for st, mult in enumerate(st_mult):
sample = RawSample(array.array("H", [
round(midpoint + triangle(x * twopi /
(buffer_size / round(c_waves * mult))) * vol)
for x in range(buffer_size)
]),
sample_rate=rate)
for wave_type in WAVE_TYPES:
for octave in range(3, 6): # [3,4,5]
for note_letter in note_letters:
# note with octave e.g. a4
cur_note = "{}{}".format(note_letter, octave)
# add wave file to dictionary
key = "{}{}".format(wave_type, cur_note)
notes[key] = WaveFile(
open("notes/{}/{}.wav".format(wave_type, cur_note), "rb"))
# main audio object
audio = AudioOut(left_channel=board.A0, right_channel=board.A1)
# mixer to allow pylyphonic playback
mixer = Mixer(voice_count=8,
sample_rate=8000,
channel_count=2,
bits_per_sample=16,
samples_signed=True)
audio.play(mixer)
# turn on the rainbow lights
for i, color in enumerate(colors):
trellis.pixels[i, 0] = color
trellis.pixels[i, 1] = color
trellis.pixels[i, 2] = color
# list of keys pressed on the previous iteration
prev_pressed = []
# voice recycling variables