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.
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@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@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@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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>>> http://lists.puredata.info/listinfo/pd-list
>>
>>
>>
>>
>> --
>> Thomas Grill
>> http://grrrr.org
>
>
>
>
> --
> Thomas Grill
> http://grrrr.org
>
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