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Select submenus : Device Drivers > USB support > USB support > USB Gadget Support. Select <*> for “USB Gadget functions configurable through configfs“, [*] for “Function filesystem (FunctionFS)” and [*] for “Audio Class 1.0“.
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ConfigFS
Configure UAC gadget through configfs saved as a file named setup_uac.
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In Device Manager of Windows PC, “Capture Input terminal (AC Interface)“ and “Speakers (AC Interface)“ will show up in Audio inputs and outputs. “AC Interface” will show up in Sound, video and game controllers.
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Test
Record and Play
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Play music and choose “Speakers (AC Interface)“ in Windows PC. Then use arecord -D hw:1,0 -c 2 -r 48000 -f S16_LE | aplay -D hw:2,0 -c 2 -r 48000 -f S16_LE command to output the sounds to the earphone of the USB sound card in USB 3.0 type C port in the SP7350 platform.
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