[meta-freescale] I2S interface testing

[Harpreet Atwal]

Hi Friends,

I have been trying to create imx-wm8974.c and in the process have successfully done:


-          Able to set bypass and loopback mode on wm8974 chip.

-          Able to set wm8974 in master mode and enable pll and set correct BCLK for 44100 sample rate at 16 bit and 2 channels = 1.41 Mhz

But I have not been able to see any activity on DACDAT pins.

DACDAT pin is connected in AUDMUX port 5 and ssi2  has been configured in I2S mode as slave.

I have tried using example playback and capture program from this link http://equalarea.com/paul/alsa-audio.html

Snd_pcm_writei exits correctly in playback program but I don't see any valid activity on DACDAT pin on oscilloscope.
Snd_pcm_readi function in capture routine exit saying "read from audio interface failed (Resource temporarily unavailable)"

I am not able to understand what I have missed in configuration.

Ssi2 -> audmux port 2 -> audmux port 5 -> wm8974

In wm8974 configuration, I have enabled mic, inppga , ADC, DAC, mono mixer, and monout.
Loopback is disabled.

If anyone ever done similar things, please let me know your experience.

Regards,
Harpreet Singh

Harpreet Atwal | Senior Embedded Software Engineer

DTI Group Ltd | Transit Security & Surveillance

31 Affleck Road, Perth Airport, WA 6105, AU

P | F +61 8 9479 1190 | harpreet.atwal at dti.com.au



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