metro-m4 call to PDMIn.record() never returns #5797
Description
CircuitPython version
Adafruit CircuitPython 7.1.0-rc.0 on 2021-12-23; Adafruit Metro M4 Express with samd51j19Code/REPL
# testing pdm mic
import time
import board
from ulab import numpy as np
from audiobusio import PDMIn, I2SOut
from neopixel import NeoPixel
neo = NeoPixel(board.NEOPIXEL, 1, brightness=0.1)
YELLOW = 0xFFFF00
RED = 0xFF0000
GREEN = 0x00FF00
# M4 I2S pins are fixed
mic = PDMIn(clock_pin=board.D3, data_pin=board.D1,
sample_rate=16000, bit_depth=16)
buffer = np.zeros(256, dtype=np.uint16)
while True:
neo[0] = YELLOW
time.sleep(1)
neo[0] = RED
mic.record(buffer, len(buffer))
neo[0] = GREEN
time.sleep(5)Behavior
Expected: NeoPixel is yellow in warmup, red while recording, then green.
Actual: NeoPixel is yellow, then sticks on red.
Call to mic.record() never returns.
I can still read and write the CIRCUITPY drive, but I have to reset the board to break out of mic.record().
This works as expected with 7.0.0, but hangs as documented here on anything after 7.1.0-rc.0.
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Additional information
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