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Unable to  create raw file for unit_tests project

Question asked by Abhishek kumar on Jul 17, 2018

I am trying to run one unit_tests project which is given by default after booting linux on i.MX8M Quad EVK board to us for playing the audio file.

I am trying to create raw file for " ./mxc_pdm_test.out " by executing following code :

./mxc_pdm_test.out -device hw:4,0 -output test-audio.raw -rate 16000 -seconds 60

What error i observed is :

ALSA lib ../../../alsa-lib- Invalid value for card
unable to open pcm device: hw:4,0fail to init alsa pdm -2

Could you please help me to understand this error for me.

What i am missing here ?