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 danomatika@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 johnnyboy7777@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 danomatika@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-request@iem.at wrote:

...

From: John Canning johnnyboy7777@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

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 johnnyboy7777@hotmail.co.uk wrote:

Thanks for getting back to me Dan

On Fri, Jul 26, 2013 at 11:50 PM, Dan Wilcox danomatika@gmail.com 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 danomatika@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 johnnyboy7777@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 danomatika@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-request@iem.at wrote:

...

From: John Canning johnnyboy7777@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

Dan Wilcox @danomatika danomatika.com robotcowboy.com

Maybe your power supply can't handle the load? 2 Amps regulated 5V is good, 1 Amp might not do it.

Martin

On 2013-07-27 05:51, John Canning wrote:

Hi Dan,

I have done some more hunting around and on the Pd FrontPage site it says that my Behringer soundcard has been proven to work with the Raspberry Pi with reduced USB speed and I have found some posts that say they have it running in full duplex. What I get is something like this when I have the sound card plugged in on boot

[ 2.469784] usb 1-1.3: new high-speed USB device number 4 using dwc_otg [ 2.571518] usb 1-1.3: New USB device found, idVendor=05e3, idProduct=0608 [ 2.571545] usb 1-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0 [ 2.571562] usb 1-1.3: Product: USB2.0 Hub [ 2.573135] hub 1-1.3:1.0: USB hub found [ 2.573640] hub 1-1.3:1.0: 4 ports detected [ 2.849881] usb 1-1.3.4: new full-speed USB device number 5 using dwc_otg [ 2.953034] usb 1-1.3.4: New USB device found, idVendor=08bb, idProduct=2704 [ 2.953064] usb 1-1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 2.953081] usb 1-1.3.4: Product: USB Audio DAC [ 2.953096] usb 1-1.3.4: Manufacturer: Burr-Brown from TI [ 2.958781] input: Burr-Brown from TI USB Audio DAC as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3.4/1-1.3.4:1.2/input/input0 [ 2.960263] hid-generic 0003:08BB:2704.0001: input,hidraw0: USB HID v1.00 Device [Burr-Brown from TI USB Audio DAC ] on usb-bcm2708_usb-1.3.4/input2

and it just hangs there. This is with nothing else plugged in to the PI. Without the lowered USB speed I get so many dropouts that it is completely unusable. I'm sorry to keep harping on about the same thing but as with all of these things you find a little nugget that gives you hope (and another and another). The videos that I have seen like this

http://hackaday.com/2013/01/28/raspberry-pi-becomes-a-guitar-effects-process...

are pretty much what I'm looking for. Imperceptible/minimal dropouts and decent FX. Can you or anyone tell me why I can't even boot the Pi with the (previously community tested) soundcard plugged in running at USB 1 speed? Or why if I plug it in after booting I crash the Pi?

This post

http://lists.puredata.info/pipermail/pd-list/2013-01/100560.html

and others in the same thread are what started me on this mission so if any of the contributors to it could tell me how they have got this up and running I would eternally grateful

Thanks again, John

On Sat, Jul 27, 2013 at 12:26 AM, Dan Wilcox <danomatika@gmail.com mailto:danomatika@gmail.com> wrote:

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
<johnnyboy7777@hotmail.co.uk <mailto:johnnyboy7777@hotmail.co.uk>>
wrote:

...

Thanks for getting back to me Dan


On Fri, Jul 26, 2013 at 11:50 PM, Dan Wilcox <danomatika@gmail.com
<mailto:danomatika@gmail.com>> 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 <danomatika@gmail.com
    <mailto:danomatika@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
    <johnnyboy7777@hotmail.co.uk
    <mailto:johnnyboy7777@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
    <danomatika@gmail.com <mailto:danomatika@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-request@iem.at
        <mailto:pd-list-request@iem.at> wrote:

...

        *From:*John Canning <johnnyboy7777@hotmail.co.uk
        <mailto:johnnyboy7777@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 <mailto: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 <http://danomatika.com/>
        robotcowboy.com <http://robotcowboy.com/>

    --------
    Dan Wilcox
    @danomatika
    danomatika.com <http://danomatika.com/>
    robotcowboy.com <http://robotcowboy.com/>

    --------
    Dan Wilcox
    @danomatika
    danomatika.com <http://danomatika.com/>
    robotcowboy.com <http://robotcowboy.com/>

--------
Dan Wilcox
@danomatika
danomatika.com <http://danomatika.com>
robotcowboy.com <http://robotcowboy.com>

---

Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

@Pagano, Patrick

Grim!! That was the next one I was about to try

Have you guys seen this

http://createdigitalmusic.com/2013/07/roll-your-own-looper-cheap-raspberry-p...

Its at least a proof of concept but he has given no information about what hardware he has used. I'll keep hunting and keep you guys informed

On Sat, Jul 27, 2013 at 7:22 PM, John Canning johnnyboy7777@hotmail.co.ukwrote:

Hi Martin,

I thought about this but since the Pi boots with the soundcard plugged in at USB 2 speed I reckon that this is not the issue. That said, I am using an iPhone charger that only outputs 1 amp. I will try it with another one as soon as I can but that won't be for a few days at least. I'll keep you informed.

John

On Sat, Jul 27, 2013 at 3:36 PM, Martin Peach martin.peach@sympatico.cawrote:

...

Maybe your power supply can't handle the load? 2 Amps regulated 5V is good, 1 Amp might not do it.

Martin

On 2013-07-27 05:51, John Canning wrote:

...

Hi Dan,

I have done some more hunting around and on the Pd FrontPage site it says that my Behringer soundcard has been proven to work with the Raspberry Pi with reduced USB speed and I have found some posts that say they have it running in full duplex. What I get is something like this when I have the sound card plugged in on boot

[ 2.469784] usb 1-1.3: new high-speed USB device number 4 using dwc_otg [ 2.571518] usb 1-1.3: New USB device found, idVendor=05e3, idProduct=0608 [ 2.571545] usb 1-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0 [ 2.571562] usb 1-1.3: Product: USB2.0 Hub [ 2.573135] hub 1-1.3:1.0: USB hub found [ 2.573640] hub 1-1.3:1.0: 4 ports detected [ 2.849881] usb 1-1.3.4: new full-speed USB device number 5 using dwc_otg [ 2.953034] usb 1-1.3.4: New USB device found, idVendor=08bb, idProduct=2704 [ 2.953064] usb 1-1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 2.953081] usb 1-1.3.4: Product: USB Audio DAC [ 2.953096] usb 1-1.3.4: Manufacturer: Burr-Brown from TI [ 2.958781] input: Burr-Brown from TI USB Audio DAC as /devices/platform/bcm2708_usb/**usb1/1-1/1-1.3/1-1.3.4/1-1.3.** 4:1.2/input/input0 [ 2.960263] hid-generic 0003:08BB:2704.0001: input,hidraw0: USB HID v1.00 Device [Burr-Brown from TI USB Audio DAC ] on usb-bcm2708_usb-1.3.4/input2

and it just hangs there. This is with nothing else plugged in to the PI. Without the lowered USB speed I get so many dropouts that it is completely unusable. I'm sorry to keep harping on about the same thing but as with all of these things you find a little nugget that gives you hope (and another and another). The videos that I have seen like this

http://hackaday.com/2013/01/**28/raspberry-pi-becomes-a-** guitar-effects-processor/http://hackaday.com/2013/01/28/raspberry-pi-becomes-a-guitar-effects-processor/

are pretty much what I'm looking for. Imperceptible/minimal dropouts and decent FX. Can you or anyone tell me why I can't even boot the Pi with the (previously community tested) soundcard plugged in running at USB 1 speed? Or why if I plug it in after booting I crash the Pi?

This post

http://lists.puredata.info/**pipermail/pd-list/2013-01/**100560.htmlhttp://lists.puredata.info/pipermail/pd-list/2013-01/100560.html

and others in the same thread are what started me on this mission so if any of the contributors to it could tell me how they have got this up and running I would eternally grateful

Thanks again, John

On Sat, Jul 27, 2013 at 12:26 AM, Dan Wilcox <danomatika@gmail.com mailto:danomatika@gmail.com> wrote:

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
<johnnyboy7777@hotmail.co.uk <mailto:johnnyboy7777@hotmail.**co.uk<johnnyboy7777@hotmail.co.uk>

...

...

wrote:

 Thanks for getting back to me Dan

...

On Fri, Jul 26, 2013 at 11:50 PM, Dan Wilcox <danomatika@gmail.com
<mailto:danomatika@gmail.com>> wrote:

    Actually I miss-typed. The issue is with "Isochronous" usb
    mode:
    http://www.raspberrypi.org/**phpBB3/viewtopic.php?f=28&t=**

29226 http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=29226Looks 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 <danomatika@gmail.com
    <mailto:danomatika@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
    <johnnyboy7777@hotmail.co.uk
    <mailto:johnnyboy7777@hotmail.**co.uk<johnnyboy7777@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
    <danomatika@gmail.com <mailto:danomatika@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.htmlhttp://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-request@iem.at
        <mailto:pd-list-request@iem.at**> wrote:

         *From:*John Canning <johnnyboy7777@hotmail.co.uk

> <mailto:johnnyboy7777@hotmail.**co.ukjohnnyboy7777@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 mailto: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 <http://danomatika.com/>
        robotcowboy.com <http://robotcowboy.com/>

    --------
    Dan Wilcox
    @danomatika
    danomatika.com <http://danomatika.com/>
    robotcowboy.com <http://robotcowboy.com/>

    --------
    Dan Wilcox
    @danomatika
    danomatika.com <http://danomatika.com/>
    robotcowboy.com <http://robotcowboy.com/>

--------
Dan Wilcox
@danomatika
danomatika.com <http://danomatika.com>
robotcowboy.com <http://robotcowboy.com>

______________________________**_________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/** listinfo/pd-list http://lists.puredata.info/listinfo/pd-list