For what it's worth, I tried force ing USB 1.1 mode on the pi with my UA-25 and that resulted in a hard lock as well. Disappointing at this point since I've worked with audio on slower embedded machines before ...
On Jul 26, 2013, at 7:19 PM, John Canning <[email protected]> wrote: > 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 > > > > > > -------- Dan Wilcox @danomatika danomatika.com robotcowboy.com
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