[alsa-devel] Help with multichannel High Speed USB audio device

Laurent . sid6582 at msn.com
Sat Jul 25 00:32:22 CEST 2009

> Date: Fri, 24 Jul 2009 11:12:48 +0200
> From: clemens at ladisch.de
> To: sid6582 at msn.com
> CC: alsa-devel at alsa-project.org
> Subject: Re: [alsa-devel] Help with multichannel High Speed USB audio device
> Laurent . wrote:
>> I made an embedded device that has a CODEC with 6 inputs connected to an ARM9
>> micro-controller that has an integrated high-speed USB controller.
>> Now, I need to write the USB code on that micro-controller so that i can capture those
>> channels in real-time at 24bits / 48 KHz with low latency (ie. sub 10ms), on a computer.
>> I only need my device to work with Linux, and if possible, I would like to avoid writing a device
>> driver on the Linux-side.
>> Is there already such a USB audio driver available that I could nearly use "as is" and to which
>> i would conform ?
> Yes, snd-usb-audio.
>> Would you have some general guideline on how to write the high-speed USB device code ?
> Just conform to the USB (2.0) and USB Audio (1.0) specifications.
>> For simplicity, my device is going to be the "clock master" of the system since it is already has
>> the exact clock that drives the CODEC.
> So you'd use an asynchronous endpoint.
> Best regards,
> Clemens

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