[PD] The dwc_otg.speed=1 issues on RPI with keyboards

Ivica Bukvic via Pd-list pd-list at lists.iem.at
Sat Jun 28 21:41:18 CEST 2014

Boot rpi without the fix, connect the soundcard, and test its audio output.
If it crackles, or simply doesn't work, then you know it doesn't work
without the fix. For good measure you can also try input (e.g. use pd's
audio tester patch).

Regarding alternative soundcards, you can also try
http://www.newegg.com/Product/Product.aspx?Item=N82E16812186035 (approx.
$8.50, tiny form factor). We got these for both rpi orchestra and a 50 rpi
installation and it works perfect.

On Jun 28, 2014 3:30 PM, "Alexandre Torres Porres via Pd-list" <
pd-list at mail.iem.at> wrote:

> I need an audio in and I got an imic griffin, it says on pd page i need to
> make this adjustment, how do I know if I don't really need to do it
> anymore? Anyway, if raspbian has changed, maybe we should update the pd
> page about it
> I dont mind getting a bluetooth keyboard if I have to, I just wonder if
> any should work fine or if there are some issues.
> thanks
> cheers
> 2014-06-28 13:21 GMT-03:00 Simon Wise via Pd-list <pd-list at lists.iem.at>:
>> On 29/06/14 01:03, Ivica Bukvic via Pd-list wrote:
>>> I unfortunately don't have the SD card with the said version of raspbian
>>> handy but FWIW I do recall not having to adjust boot parameters in the
>>> most
>>> recent install and had no problems connecting wired keyboard, mouse, and
>>> a
>>> monitor without pi crashing.
>>  *From:* Pd-list [mailto:pd-list-bounces at mail.iem.at] *On Behalf Of
>>>>>>> *Alexandre
>>>>>>> Torres Porres via Pd-list
>>>>>>> *Sent:* Friday, June 27, 2014 8:28 PM
>>>>>>> *To:* pd-lista puredata
>>>>>>> *Subject:* [PD] The dwc_otg.speed=1 issues on RPI with keyboards
>>>>>>> Hi there, so, about setting the USB to 1.1 speed in RPI with
>>>>>>> "dwc_otg.speed=1".
>>>>>>> I've only seen a mention about it conflicting with USB and wireless
>>>>>>> keyboards on the Pd page (meaning it works only with bluetooth
>>>>>>> ones), so I
>>>>>>> come here to ask you people a few questions...
>>>>>>> I wonder if this could be worked around in future versions of the
>>>>>>> raspbian operating system, seems to be some sort of a bug, right?
>>>>>>> On that note, hasn't it been already fixed by any chance? Or has
>>>>>>> anyone
>>>>>>> found a USB or wireless keyboard that eventually works?
>> Many sound cards do not require the "dwc_otg.speed=1" setting, get one of
>> those. The RPi USB is really quite awful, and many sound cards do things it
>> cannot cope with, but the simple ones are mostly fine. I believe it has
>> been improved over time, so a recent raspbian would be sensible. I've used
>> wireless keyboards or wifi with usb audio on a few occasions, but usually
>> try to make all communications via ethernet and custom interfaces via the
>> local GPIOs.
>> this audio chip has worked well, sounds clean and is cheap ...
>> http://www.ebay.com/itm/5V-USB-Powered-PCM2704-MINI-USB-
>> Sound-Card-DAC-decoder-board-for-PC-Computer-/171295902514?
>> pt=LH_DefaultDomain_0&hash=item27e2080b32
>> or
>> http://www.ebay.com/itm/PCM2704-USB-DAC-to-S-PDIF-
>> Sound-Card-Decoder-Board-3-5mm-Analog-Output-F-PC-/171295895054?pt=LH_
>> DefaultDomain_0&hash=item27e207ee0e&_sid=2048038
>>  Does it work with any bluetooth keyboard/mouse? I really don't like
>>>>>>> those tiny mini small ones, do any of you suggest a nice bigger one?
>>>>>>> It
>>>>>>> could be a compact one...
>> Some Bluetooth keyboards do a very annoying 'sleep' to save battery ..
>> but then they don't send the first couple of keystrokes when you start
>> typing again, meaning you need to hit shift before starting typing to wake
>> it up. Useless when trying to use it for cues etc. No idea how common this
>> design is, but I wasted some cash (much more than the audio card!) on mine.
>> Simon
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