alsa driver as simple as possible like :
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play command: aplay --device=hw:1,0 [login to view URL]
in driver could get raw pcm data, rate, format
that's the requirement.
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Hey, I am [login to view URL] in embedded system designer based on Linux platform, i had developed pseudo driver for LED on beaglebone black 3 board, and usb device driver for Ubuntu, so i think i can helps you.