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

[Josh Moore]

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





On Wed, Oct 7, 2020 at 5:18 AM Dan Wilcox <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 wrote:
>
> Date: Tue, 6 Oct 2020 10:48:48 +0800
> From: Chris McCormick <chris at mccormick.cx>
> To: PD List <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>
> 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
> robotcowboy.com
>
>
>
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