[PD] raspberry pi user experience

Mon Jan 28 10:40:39 CET 2013

hello,
i use the beringer UCA222 and got it to work with 5ms audio bufer with the pi in full duplex.
cheers
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
>>>>>>>>
>>>>>>>> _______________________________________________
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Thomas Grill
>>>>>>> http://grrrr.org
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Thomas Grill
>>>>>> http://grrrr.org
>>>>>>
>>>>>> _______________________________________________
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>>>>>
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