[PD] raspberry pi user experience

[Pierre Massat]

My USB 2.0 soundcard (E-MU 040) works fine in the lastest Raspbian without
any tweaks.
I'm thus not sure it has to be with USB itself.

Cheers,

Pierre.

2013/1/27 katja <katjavetter at gmail.com>

> Hello,
>
> Some people seem to have result with setting lower USB speed on the
> Pi, but when I try this, the Pi doesn't even respond to keyboard
> anymore. Checking /boot/cmdline.txt with another computer, I'm sure it
> is not due to a typo. But the order of settings may be important?
> Could anyone copy the full text of /boot/cmdline.txt for me, if you
> have keyboard working with lowered USB speed? (I'm not talking about
> good audio yet).
>
> Thanks,
> Katja
>
>
> On Sat, Jan 26, 2013 at 8:54 PM, Thomas Grill <gr at grrrr.org> wrote:
> > Message to self: it seems that one has to wait for updated RPi USB
> > firmware/drivers to get USB 2.0 audio going.
> > Obviously the "isochronous transfer mode" as used by audio interfaces is
> > currently broken.
> > gr~~~
> >
> >
> > 2013/1/26 Thomas Grill <gr at grrrr.org>
> >>
> >> Hi all,
> >> for my USB audio class 2.0 device "Native Instruments Komplete Audio 6"
> i
> >> can't report such good news.
> >> There is constant irregular crackling, not only with Pd but also with
> >> aplay etc. It seems related to USB bandwidth, since turning on and off
> the
> >> inputs in Pd changes crackling frequency. The dwc_otg.speed setting is
> not
> >> usable for me, since the device is dependent on USB 2.0 operation.
> >> Any experiences with USB 2.0 audio devices under ALSA/rpi?
> >> thanks,
> >> gr~~~
> >>
> >>
> >> 2013/1/26 Cyrille Henry <ch at chnry.net>
> >>>
> >>> hello,
> >>>
> >>> I just install raspbian release and update it. then install pd 0.44.1
> >>> (without any specific optimisation flag)
> >>>
> >>> I made the standard optimisation :
> >>> * - rtprio 99
> >>> * - memlock 1000000000
> >>> in /etc/security/limits.conf
> >>>
> >>> and
> >>> dwc_otg.speed=1
> >>> in /boot/cmdline.txt
> >>> as suggested by miller
> >>>
> >>> I use a uca222 beringher (that cost about 20 or 25€) sound card.
> >>> trying the test audio and midi, there is no click with 10ms audio
> buffer
> >>> (with adc~ enable).
> >>>
> >>> this is with usb keyboard / mouse combo plugged and graphical interface
> >>> (for the system and for pd).
> >>>
> >>> without X, audiobuf can be as low as 5ms
> >>>
> >>> having a usb keyboard did not change anything for me.
> >>>
> >>> i'm very happy
> >>>
> >>> cheers
> >>> c
> >>>
> >>> _______________________________________________
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> >>
> >>
> >>
> >>
> >> --
> >> Thomas Grill
> >> http://grrrr.org
> >
> >
> >
> >
> > --
> > Thomas Grill
> > http://grrrr.org
> >
> > _______________________________________________
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> >
>
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