[PD] RPI stereo USB audio was: audio interface with multiple ins on raspberry pi

[Dan Wilcox]

Thanks Josh, good to know. Now that the RPI 4 has a controller chip, I should probably try one again.

I had some success for a project using a quad-core Udoo board circa 2013 but it was also more expensive than the Pis at that time and a bit overkill. It *did* however have a USB controller chip.

> On Oct 7, 2020, at 3:42 PM, Josh Moore <kh405.7h30ry at gmail.com> wrote:
> 
> The Pi 2 and 3's usb were very much hacks due to the limitations of the Broadcom chip. It's fixed in the Pi4. See here for info: https://www.raspberrypi.org/documentation/hardware/raspberrypi/usb/README.md <https://www.raspberrypi.org/documentation/hardware/raspberrypi/usb/README.md> 
> 
> 
> 
> 
> On Wed, Oct 7, 2020 at 5:18 AM Dan Wilcox <danomatika at gmail.com <mailto:danomatika at gmail.com>> wrote:
> To add on to Chris's question with a tangent, have any of you had good experience with bog-standard stereo USB Audio interfaces and RPI 3 or 4?
> 
> Some years ago now, I tried to use an RPI 2 with my trusty USB 1.1 standard audio interface (Roland Edirol UA-25) which is full-duplex stereo, 2 in / 2 out. I could never get it to work well in full-duplex mode without dropouts, even with a low-latency kernel and other real-time tweaks. In the end, it seemed the USB driver on the RPI was simply not designed for the "isynchronous audio" this requires.
> 
> The same device worked well on my original wearable, a Pentium 3 500 MHz machine but with a dedicated USB controller chip.
> 
> In the end, I decided to move toward iOS for embedded/wearable (hence PdParty) and the same device works very well at low-latencies on iPads and my (now old) iPhone 5S.
> 
> I'd like to still be able to run the setup with alternate systems, so does anyone have experience that the USB drivers have been improved? Thanks in advance
> 
>> On Oct 6, 2020, at 12:00 PM, pd-list-request at lists.iem.at <mailto:pd-list-request at lists.iem.at> wrote:
>> 
>> Date: Tue, 6 Oct 2020 10:48:48 +0800
>> From: Chris McCormick <chris at mccormick.cx <mailto:chris at mccormick.cx>>
>> To: PD List <pd-list at iem.at <mailto:pd-list at iem.at>>
>> Subject: [PD] audio interface with multiple ins on raspberry pi
>> Message-ID: <5f3198d4-6210-4b41-d3a6-2cccbd3aae0a at mccormick.cx <mailto:5f3198d4-6210-4b41-d3a6-2cccbd3aae0a at mccormick.cx>>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>> 
>> Hey all,
>> 
>> Same question as the previous poster but I was wondering about inputs 
>> rather than outputs. Ideal solution:
>> 
>>  * USB.
>>  * Low cost.
>>  * More than 2 channels in.
>>  * Headphone sized jacks.
>>  * Works with Raspberry Pi.
>> 
>> I've searched but could not find such a beast. Any hints?
>> 
>> Cheers,
>> 
>> Chris.
> 
> --------
> Dan Wilcox
> @danomatika <http://twitter.com/danomatika>
> danomatika.com <http://danomatika.com/>
> robotcowboy.com <http://robotcowboy.com/>
> 
> 
> 
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--------
Dan Wilcox
@danomatika <http://twitter.com/danomatika>
danomatika.com <http://danomatika.com/>
robotcowboy.com <http://robotcowboy.com/>



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