Date: Mon, 05 May 2014 13:57:44 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Johny Mattsson <johny.mattsson+fbsd@gmail.com>, freebsd-arm@freebsd.org Subject: USB isochronous traffic with Rasberry Pi [WAS: Re: USB audio device on Raspberry Pi] Message-ID: <53677CB8.5000800@selasky.org> In-Reply-To: <5363C133.2000304@selasky.org> References: <20140425154430.GA76168@utility-01.thismonkey.com> <535A8AEA.1000100@selasky.org> <20140425204134.GA458@cicely7.cicely.de> <20140430091411.GA45015@utility-01.thismonkey.com> <5360C0A7.9010407@selasky.org> <1398867266.22079.51.camel@revolution.hippie.lan> <CAGW5k5bZ_bTQUXuzNm=tbwx3npz1_HoOR3vM8TBRVFs8zWCq-w@mail.gmail.com> <5362638B.1080104@selasky.org> <5363C133.2000304@selasky.org>
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Hi, To get USB isochronous traffic working with the DWC OTG you need this patch: http://svnweb.freebsd.org/changeset/base/265358 BTW: I see that every second or so there is a glitch. I suspect this is because someone in the kernel is calling DELAY(). Is there an easy way to figure out who is blocking the DWC OTG interrupt routine from executing? I was thinking about adding something like: if (!cold) printf("Using delay\n"); To the DELAY() function to figure out the caller. --HPS
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