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 <danomat...@gmail.com> 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 <johnnyboy7...@hotmail.co.uk> 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 <danomat...@gmail.com> 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, pd-list-requ...@iem.at wrote: >> >>> From: John Canning <johnnyboy7...@hotmail.co.uk> >>> Subject: [PD] Raspberry Pi Behringer UCA222 boot problems >>> Date: July 26, 2013 5:40:49 PM EDT >>> To: Pure Data <pd-list@iem.at> >>> >>> >>> 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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