360475e266
This adds I2SOut and PDMIn support via PIO. StateMachines can now: * read and read while writing * transfer in 1, 2 or 4 byte increments * init pins based on expected defaults automatically * be stopped and restarted * rxfifo can be cleared and rxstalls detected (good for tracking when the reading code isn't keeping up) Fixes #4162
37 lines
702 B
Python
37 lines
702 B
Python
import audiocore
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import audiobusio
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import board
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import digitalio
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import array
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import time
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import math
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import rp2pio
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import adafruit_pioasm
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time.sleep(10)
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trigger = digitalio.DigitalInOut(board.D4)
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trigger.switch_to_output(True)
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# Generate one period of sine wav.
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length = 8000 // 440
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# signed 16 bit
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s16 = array.array("h", [0] * length)
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for i in range(length):
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s16[i] = int(math.sin(math.pi * 2 * i / length) * (2 ** 15))
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print(s16[i])
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sample = audiocore.RawSample(s16, sample_rate=8000)
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dac = audiobusio.I2SOut(bit_clock=board.D10,
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word_select=board.D11, data=board.D12)
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trigger.value = False
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dac.play(sample, loop=True)
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time.sleep(1)
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dac.stop()
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trigger.value = True
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print("done")
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