# \[WP8548\]\[mangOH\]\[element14\] How to do playback through PCM i

**URL:** <https://forum.sierrawireless.com/t/wp8548-mangoh-element14-how-to-do-playback-through-pcm-i/8671>\
**Category:** WP Series\
**Created:** [July 20, 2016, 1:03am UTC](https://forum.sierrawireless.com/t/wp8548-mangoh-element14-how-to-do-playback-through-pcm-i/8671 "2016-07-20T01:03:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![supercraig](https://avatars.discourse-cdn.com/v4/letter/s/ecccb3/32.png) [@supercraig](https://forum.sierrawireless.com/u/supercraig)\
**Post date:** [July 20, 2016, 1:03am UTC](https://forum.sierrawireless.com/t/wp8548-mangoh-element14-how-to-do-playback-through-pcm-i/8671/1 "2016-07-20T01:03:48Z")

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We get the mangOH green starter kit, element 14, with AirPrime WP8548.  
There is already a codec wm8944 on board, and we can find the sound card.  
root@swi-mdm9x15:/proc/asound# cat pcm  
00-00: MultiMedia1 (_) : : playback 1 : capture 1  
00-01: MultiMedia2 (_) : : playback 1 : capture 1  
…  
00-22: (Primary I2S Playback) : : playback 1 : capture 1  
00-23: (Primary I2S Capture) : : playback 1 : capture 1

We try to test the PCM device, but it’s fail.  
root@swi-mdm9x15:~# aplay -D default /media/wav/hotel\_ca.wav  
aplay: Playing ‘/media/wav/hotel\_ca.wav’:Signed 16 bit Little Endian  
Wrong device fromat  
Segmentation fault

How could we try the I2S PCM interface? Very appreciate.

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**Author:** ![Rex\_alex](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@Rex\_alex](https://forum.sierrawireless.com/u/Rex_alex)\
**Post date:** [July 27, 2016, 9:57am UTC](https://forum.sierrawireless.com/t/wp8548-mangoh-element14-how-to-do-playback-through-pcm-i/8671/2 "2016-07-27T09:57:08Z")

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hi,  
[https://forum.sierrawireless.com/viewtopic.php?f=181&t=9696](https://forum.sierrawireless.com/viewtopic.php?f=181&t=9696) might help you more 😃

-Alex