40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
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# SPDX-License-Identifier: Unlicense
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"""
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CircuitPython I2S Tone playback example.
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Plays a tone for one second on, one
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second off, in a loop.
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Remove this line and all of the following docstring content before submitting to the Learn repo.
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Update the three I2S pins to match the wiring chosen for the microcontroller. If you are unsure of
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a proper I2S pin combination, run the pin combination script found here:
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https://adafru.it/i2s-pin-combo-finder
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Update the following pin names to a viable pin combination:
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* BIT_CLOCK_PIN
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* WORD_SELECT_PIN
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* DATA_PIN
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"""
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import time
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import array
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import math
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import audiocore
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import board
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import audiobusio
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audio = audiobusio.I2SOut(board.BIT_CLOCK_PIN, board.WORD_SELECT_PIN, board.DATA_PIN)
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tone_volume = 0.1 # Increase this to increase the volume of the tone.
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frequency = 440 # Set this to the Hz of the tone you want to generate.
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length = 8000 // frequency
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sine_wave = array.array("h", [0] * length)
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for i in range(length):
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sine_wave[i] = int((math.sin(math.pi * 2 * i / length)) * tone_volume * (2 ** 15 - 1))
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sine_wave_sample = audiocore.RawSample(sine_wave)
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while True:
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audio.play(sine_wave_sample, loop=True)
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time.sleep(1)
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audio.stop()
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time.sleep(1)
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