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Date: Fri, 24 Jul 2009 11:12:48 +0200 From: clemens@ladisch.de To: sid6582@msn.com CC: alsa-devel@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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