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