Adafruit_Learning_System_Gu.../Synthio_Fundamentals/example_04_envelope.py

58 lines
1.5 KiB
Python

# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
#
# SPDX-License-Identifier: MIT
import time
import board
import digitalio
import audiomixer
import synthio
# for PWM audio with an RC filter
#import audiopwmio
#audio = audiopwmio.PWMAudioOut(board.GP10)
# for I2S audio with external I2S DAC board
import audiobusio
# I2S on Audio BFF or Amp BFF on QT Py:
# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
# I2S audio on PropMaker Feather RP2040
power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
power.switch_to_output(value=True)
audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
mixer = audiomixer.Mixer(channel_count=1, sample_rate=22050, buffer_size=2048)
amp_env_slow = synthio.Envelope(
attack_time=0.2,
sustain_level=1.0,
release_time=0.8
)
amp_env_fast = synthio.Envelope(
attack_time=0.1,
sustain_level=0.5,
release_time=0.2
)
synth = synthio.Synthesizer(channel_count=1, sample_rate=22050, envelope=amp_env_slow)
audio.play(mixer)
mixer.voice[0].play(synth)
mixer.voice[0].level = 0.2
while True:
synth.envelope = amp_env_slow
synth.press(46)
time.sleep(1.25)
synth.release(46)
time.sleep(1.25)
synth.envelope = amp_env_fast
synth.press(51)
time.sleep(1.25)
synth.release(51)
time.sleep(1.25)