39 lines
1 KiB
Python
39 lines
1 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 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=44100, buffer_size=4096)
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synth = synthio.Synthesizer(channel_count=1, sample_rate=44100)
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audio.play(mixer)
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mixer.voice[0].play(synth)
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mixer.voice[0].level = 0.1
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lfo = synthio.LFO(rate=0.6, scale=0.05) # 1 Hz lfo at 0.25%
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midi_note = 52
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note = synthio.Note(synthio.midi_to_hz(midi_note), bend=lfo)
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synth.press(note)
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while True:
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pass
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