[PD] raspberry pi user experience

[katja]

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
>> >>>>>
>> >>>>> _______________________________________________
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>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>> --
>> >>>> Thomas Grill
>> >>>> http://grrrr.org
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>> --
>> >>> Thomas Grill
>> >>> http://grrrr.org
>> >>>
>> >>> _______________________________________________
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>> >>
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