[PD] raspberry pi user experience

Thomas Grill gr at grrrr.org
Sat Jan 26 20:54:25 CET 2013


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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