[PD] raspberry pi user experience

Tue Jan 29 13:29:03 CET 2013

hello,

both 44.1K and 48K works.
cheers
c

Le 29/01/2013 10:32, Peter P. a écrit :
> * 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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