topic IMX8MM mini - PDM audio record in i.MX Processors

IMX8MM mini - PDM audio record

dudisasson — Tue, 14 Jul 2020 12:36:09 GMT

Hi,

I am trying to record audio from a PDM microphone (SPH0641LM4H-1)

the microphone is connected as follow:

i tried using gstreamer to record but the file i get is just noise.

i can see the output clock to the microphone and the data outputting from it.

this is one of the commands i tried:

gst-launch-1.0 -v alsasrc device=plughw:1,0 ! queue ! audioconvert ! audio/x-raw, rate=16000 ! vorbisenc ! oggmux ! filesink location=alsasrc.ogg

the PDM is conneted to the micfil driver:

[ 3.225068] imx-micfil sound-micfil: snd-soc-dummy-dai <-> 30080000.micfil mapping ok
[ 3.232926] imx-micfil sound-micfil: ASoC: no DMI vendor name!
[ 4.130242] #1: imx-audio-micfil

any suggestions?

Re: IMX8MM mini - PDM audio record

igorpadykov — Tue, 14 Jul 2020 23:26:56 GMT

Hi Dudi

one can try with pdm unit test:

mxc_pdm_test\test - imx-test - i.MX Driver Test Application Software

check sect.7.6.4.1 User Interface i.MX Linux Reference Manual

Best regards
igor
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Re: IMX8MM mini - PDM audio record

sreedhar_appala — Wed, 02 Dec 2020 06:34:50 GMT

Hi,

Are you able to solve the problem? request you share the details.

we are also facing the similar issue.

Regards, Sreedhar