46 lines
1.1 KiB
Python
46 lines
1.1 KiB
Python
# SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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import array
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import math
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import time
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import audiobusio
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import audiocore
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import board
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import adafruit_tlv320
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i2c = board.I2C()
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dac = adafruit_tlv320.TLV320DAC3100(i2c)
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# set sample rate & bit depth, use bclk
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dac.configure_clocks(sample_rate=44100, bit_depth=16)
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# use headphones
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dac.headphone_output = True
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dac.headphone_volume = -15 # dB
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# or use speaker
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# dac.speaker_output = True
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# dac.speaker_volume = -20 # dB
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if "I2S_BCLK" and "I2S_WS" in dir(board):
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audio = audiobusio.I2SOut(board.I2S_BCLK, board.I2S_WS, board.I2S_DIN)
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else:
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audio = audiobusio.I2SOut(board.D9, board.D10, board.D11)
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# generate a sine wave
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tone_volume = 0.5
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frequency = 440
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sample_rate = dac.sample_rate
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length = sample_rate // 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, sample_rate=sample_rate)
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while True:
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audio.stop()
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time.sleep(1)
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audio.play(sine_wave_sample, loop=True)
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time.sleep(1)
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