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 <[email protected]> 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, [email protected] wrote: > > Date: Tue, 6 Oct 2020 10:48:48 +0800 > From: Chris McCormick <[email protected]> > To: PD List <[email protected]> > Subject: [PD] audio interface with multiple ins on raspberry pi > Message-ID: <[email protected]> > 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 > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > https://lists.puredata.info/listinfo/pd-list >
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