I have pi-4 with 4 mic hat:
pi@raspberrypi:~/work/4mics_hat $ uname -a
Linux raspberrypi 5.10.63-v7l+ #1488 SMP Thu Nov 18 16:15:28 GMT 2021 armv7l GNU/Linux
When I execute arecord -L it find the device
pi@raspberrypi:~/work/4mics_hat $ arecord -L
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault
Default Audio Device
lavrate
Rate Converter Plugin Using Libav/FFmpeg Library
samplerate
Rate Converter Plugin Using Samplerate Library
speexrate
Rate Converter Plugin Using Speex Resampler
jack
JACK Audio Connection Kit
oss
Open Sound System
pulse
PulseAudio Sound Server
upmix
Plugin for channel upmix (4,6,8)
vdownmix
Plugin for channel downmix (stereo) with a simple spacialization
default
Playback/recording through the PulseAudio sound server
playback
ac108
usbstream:CARD=vc4hdmi0
vc4-hdmi-0
USB Stream Output
usbstream:CARD=vc4hdmi1
vc4-hdmi-1
USB Stream Output
hw:CARD=seeed4micvoicec,DEV=0
seeed-4mic-voicecard, bcm2835-i2s-ac10x-codec0 ac10x-codec0-0
Direct hardware device without any conversions
plughw:CARD=seeed4micvoicec,DEV=0
seeed-4mic-voicecard, bcm2835-i2s-ac10x-codec0 ac10x-codec0-0
Hardware device with all software conversions
sysdefault:CARD=seeed4micvoicec
seeed-4mic-voicecard, bcm2835-i2s-ac10x-codec0 ac10x-codec0-0
Default Audio Device
dsnoop:CARD=seeed4micvoicec,DEV=0
seeed-4mic-voicecard, bcm2835-i2s-ac10x-codec0 ac10x-codec0-0
Direct sample snooping device
usbstream:CARD=seeed4micvoicec
seeed-4mic-voicecard
USB Stream Output
But, when I try to record it does not work. Looks like the record stream.read function is stuck
Copied from recording_examples/record.py
for i in range(0, int(RESPEAKER_RATE / CHUNK * RECORD_SECONDS)):
print(“1”)
data = stream.read(CHUNK)
NEVER GET TO THIS POINT
print(“2”)
frames.append(data)
print(“3”)