[PD] Raspberry Pi USB2 audio fixed (apparently)

[Pierre Massat]

Hi Julian,
This Moebius distro looks very interesting. Can you please tell us how you
installed Pd ? From the Raspbian repos ?
Have you tried it with full duplex with your soundcard yet ? What latency
are you getting (I can't get below 15 ms in Raspbian with some fft in my
patch) ?

Also is this think about the power supply true ? They mention it too on the
Satellite CCRMA webpage. Where can I buy a power cable that outputs 5.2 V ?
I'm currently using a samsung smartphone charger.

That's a lot of questions but you made me curious (and hopeful again) !

Cheers,

Pierre.


2013/7/3 Julian Brooks <jbeezez at gmail.com>

> I'm having good results from using a much leaner install - it's called
> Mobius:
> http://moebiuslinux.sourceforge.net/
>
> Obviously depends on your usage but I'm ssh'ing into the pi and works
> great.  The minimal install seems to help with overclocking too so I reckon
> I'm getting about another 35-40% out of the pi.
>
> The main project I've been working on has a pmpd patch that the regular
> raspbian wouldn't even run, on top of that I'm driving a couple of sensors
> (thanks Martin:), audio synthesis, got a reasonably complex quad
> spacialisation patch (thanks Lorenzo:) and is driving a 6 channel
> soundcard.  This is without the usb-slowdown option.
>
> Obviously it's pushing the Pi right up to the limit but it runs* just*about stably.
>
> What I do think made a significant difference was switching the power
> cable to one that outputs 5.2v so by the time it gets to the pi it's a
> solid 5v.
>
> Julian
>
>
> On 3 July 2013 09:42, Dan Wilcox <danomatika at gmail.com> wrote:
>
>> Yeah I tried that out a few months ago when we started the thread. Jack
>> adds some unnecessary overhead in my opinion and I'm surprised that a
>> device that should be more than capable to handle this is just not setup
>> correctly. I'm running a minimal commandline install and pd + realtime &
>> straight alsa should work great ... it has for me in the past.
>>
>> His jack setup basically uses *all* the cpu of the pi, so that cuts out
>> the other parts of my setup altogether .. visual, device input, etc. Again,
>> I was able to get good latency with a much lower resource machine (until it
>> just wore out), so it *should* be possible.
>> On Jul 3, 2013, at 4:35 AM, Julian Brooks <jbeezez at gmail.com> wrote:
>>
>> Hey Dan,
>>
>> Jeremy (autostatic), who setup the 'rpi and low latency, real time audio'
>> thread has a UA-25 and seems to have full duplex working with jack (this
>> was before the recent tweaks as well):
>>
>> http://www.raspberrypi.org/phpBB3/viewtopic.php?p=286222&sid=85c8b0a7cca69e35dcafaf58ff916eec#p286222
>>
>> Could be worth asking him?
>>
>> Julian
>>
>>
>> On 3 July 2013 02:58, Dan Wilcox <danomatika at gmail.com> wrote:
>>
>>> Yeah I tried the latest firmware with my Raspbian install and still have
>>> issues with my UA-25. Full stereo duplex = dropouts. :(
>>>
>>> On Jul 2, 2013, at 5:52 PM, pd-list-request at iem.at wrote:
>>>
>>> *From: *Pierre Massat <pimassat at gmail.com>
>>>  *Subject: **Re: [PD] Raspberry Pi USB2 audio fixed (apparently)*
>>>  *Date: *July 2, 2013 3:52:31 PM EDT
>>> *To: *Julian Brooks <jbeezez at gmail.com>
>>>  *Cc: *PD List <pd-list at iem.at>
>>>
>>>
>>>  Hi all,
>>>
>>> I did a fresh install of Raspbian using the NOOBS installer. The
>>> pd-extended package from puredata.info doesn't work with my soundcard
>>> (it wasn't working before). And Pd vanilla installed from the Raspbian
>>> repositories doesn't work with it either (although it was working fine
>>> before). My soundcard is an old EMU 0404 USB. By "doesn't work" I mean that
>>> it either throws an "Audio stuck/closing audio" error, or simply freezes
>>> everything (Pd, LXDE, mouse, everything) and all I can do is unplug the
>>> power chord.
>>>
>>> So for me not only did it not fix anything, but i'm actually worse off
>>> and left with the inability to use Pd at all on my Pi.
>>>
>>> I haven't tried Miller's compiled version of Vanilla yet (I still don't
>>> know how it is different from the one available in the Raspbian repos). The
>>> recent Planet CCRMA Satelite for the RPi is also an option.
>>>
>>> Pierre.
>>>
>>>
>>>  --------
>>> Dan Wilcox
>>> @danomatika
>>> danomatika.com
>>> robotcowboy.com
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Pd-list at iem.at mailing list
>>> UNSUBSCRIBE and account-management ->
>>> http://lists.puredata.info/listinfo/pd-list
>>>
>>>
>>
>>  --------
>> Dan Wilcox
>> @danomatika
>> danomatika.com
>> robotcowboy.com
>>
>>
>>
>>
>>
>>
>
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