Thanks for getting back to me Dan
On Fri, Jul 26, 2013 at 11:50 PM, Dan Wilcox <[email protected]> wrote: > Actually I miss-typed. The issue is with "Isochronous" usb mode: > http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=29226 Looks like > things should be better for USB 2 audio devices, but still issues with USB > 1.1 devices (aka mine :P): > > While Isoc has improved for pretty much everyone using USB2.0 devices > (USB1.1 will still suffer from lost packets due to split transaction > breakage noted elsewhere) I'm still annoyed at my webcams "kinda working" - > I get 1-2 seconds of uninterrupted video and then a half-garbled frame. > > > > On Jul 26, 2013, at 6:35 PM, Dan Wilcox <[email protected]> wrote: > > Sure, but that's only for certain types of USB devices. Some are working > and others aren't. More "professional" sound cards require > lower-latency/burst mode over USB which the PI firmware currently doesn't > allow and/or doesn't set the correct priority for. The issue AFAICT is that > essentially the usb host is software defined on the SOC and they haven't > optimized it for usb audio, or something like that. > > For instance, I can get stereo out in Pd working fine with my Edirol UA-25 > . If I enable an audio input, I get instant dropouts. Yeah, I guess it > "works", but not well enough for me. > > On Jul 26, 2013, at 6:27 PM, John Canning <[email protected]> > wrote: > > Hi Dan, > > Thanks for getting back to me. I'm still very new to the Pi but have found > this post that seems to say that it can work. I'm confused. What do you > reckon? > > > On Fri, Jul 26, 2013 at 11:02 PM, Dan Wilcox <[email protected]> wrote: > >> Simply put, the RPI firmware does not work with USB audio correctly yet. >> See this thread: >> http://lists.puredata.info/pipermail/pd-list/2013-07/103261.html >> >> I keep looking for fixes, but the way USB is handled, the only way for it >> to work without dropouts is to have *nothing* else plugged into the usb bus >> and ethernet disabled ... sucks. >> >> On Jul 26, 2013, at 5:41 PM, [email protected] wrote: >> >> *From: *John Canning <[email protected]> >> *Subject: **[PD] Raspberry Pi Behringer UCA222 boot problems* >> *Date: *July 26, 2013 5:40:49 PM EDT >> *To: *Pure Data <[email protected]> >> >> >> Hi Folks, >> >> I have been trying for quite a while to get my Raspberry Pi to work in >> full duplex with Pd. I have installed the OS on the PdPi site and updated >> it. I am using a Behringer UCA222 for audio. When I change the USB speed >> down to 1 (dwc_otg.speed=1) in /boot/cmdline.txt my Pi won't boot with the >> soundcard plugged in. If I unplug the soundcard the Pi will boot but as >> soon as I plug it in the Pi crashes. Has anyone got any suggestions about >> why this is happening? >> >> Thanks, >> John >> >> >> -------- >> Dan Wilcox >> @danomatika >> danomatika.com >> robotcowboy.com >> >> >> >> >> >> > > -------- > Dan Wilcox > @danomatika > danomatika.com > robotcowboy.com > > > > > > > -------- > Dan Wilcox > @danomatika > danomatika.com > robotcowboy.com > > > > > >
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