[PD] raspberry pi user experience

Tue Jan 29 11:32:01 CET 2013

* Cyrille Henry <ch at chnry.net> [2013-01-28 10:41]:
> hello,
> i use the beringer UCA222 and got it to work with 5ms audio bufer with the pi in full duplex.
great news! which sampling rate do you run by the way? I suppose the hardware
AD/DAcs are fixed to 48k. I never completely understood this, and
should actually ask the LAU list, but wonder where the resampling in
Linux is done when you run Pd at 44k1.

> cheers
Santé!

P
> c
> 
> 
> Le 27/01/2013 20:40, katja a écrit :
> >Both are already mentioned but I'd like to confirm that these do work
> >on RPi (provided the USB speed is lowered as described in this
> >thread): iMic and Behringer UCA202.
> >
> >Katja
> >
> >
> >On Sun, Jan 27, 2013 at 5:51 PM, Miller Puckette <msp at ucsd.edu> wrote:
> >>I heard suggestions on the Pi sites (I forget exactly where) that the USB
> >>2.0 implementation isn't compatible with a large variety of USB 2.0 devices
> >>(including for instance the Griffin iMic).  So I don't think the issue is
> >>the load that USB 2.0 puts on the Pi, it's simply bugs.  But I gather nobody
> >>is in a hurry to get them fixed - the attitude in Cambridge is that it's the
> >>devices' fault, not the Pi's.
> >>
> >>I have beem suspecting that my keyboard is also incompatible with the Pi at
> >>USB 1.1 speed.  I haven't tried other keyboards yet since I'm usually happy
> >>to ssh in without any other USB devices (besides audio and ethernet)
> >>talking to the Pi.  But this is not always true so soon enough I'll have to
> >>try other keyboards so I can get the thing working as a standalone computer.
> >>
> >>cheers
> >>Miller
> >>
> >>On Sun, Jan 27, 2013 at 04:50:16PM +0100, katja wrote:
> >>>Thanks Pierre and Cyrille.
> >>>
> >>>It turned out that various keyboards and mouse just kill USB (when at
> >>>1.1) on the Pi. 'Keysonic Wireless Trackball Keyboard' happens to work
> >>>well. The lower USB speed brings substantial improvement of the audio
> >>>indeed. Now a real realtime kernel, that would probably improve things
> >>>further.
> >>>
> >>>Katja
> >>>
> >>>
> >>>
> >>>On Sun, Jan 27, 2013 at 2:33 PM, Cyrille Henry <ch at chnry.net> wrote:
> >>>>i put it in front of everything :
> >>>>
> >>>>dwc_otg.speed=1 dwc_otg.lpm_enable=0 console=ttyAMA0,115200
> >>>>kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4
> >>>>elevator=deadline rootwait
> >>>>
> >>>>cheers
> >>>>c
> >>>>
> >>>>Le 27/01/2013 11:42, katja a écrit :
> >>>>
> >>>>>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
> >>>>>>>>
> >>>>>>>>_______________________________________________
> >>>>>>>>Pd-list at iem.at mailing list
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> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>--
> >>>>>>>Thomas Grill
> >>>>>>>http://grrrr.org
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>--
> >>>>>>Thomas Grill
> >>>>>>http://grrrr.org
> >>>>>>
> >>>>>>_______________________________________________
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> >>>>>
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> >>>>
> >>>
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