[PD] I2S audio possibilities

[Simon Wise]

On 05/02/15 10:01, Brian Fay wrote:
> Thanks for the info, my experience with USB was pretty similar - had to run
> Pd in headless mode (no X), and definitely needed to do a lot of tweaking
> before things were satisfying.
>
> The Wolfson sounds like it could be a little bit of work to get running,
> but I'm glad to hear that the quality is good. I'll keep an eye on it and
> see if they do anything to support the new model of the Pi.

a new wolfson card, to fit the B+ and A+ models is available so they are 
certainly actively developing. I have not checked the driver situation, but they 
originally aimed to support it in raspbian and I imagine both the wolfson card 
lot and the raspberry lot have been rather focussed on the new models ... so I 
hope there will be progress there. The binaries I posted work fine in the B 
model with the raspbian with:
Linux 3.10.29+ #636 PREEMPT Sun Feb 9 19:58:58 GMT 2014 armv6l

that wolson/RT kernel is:
Linux rpi-1 3.12.13-rt21+ #1 PREEMPT RT Thu Mar 27 16:58:09 CET 2014 armv6l



If you are looking for something more powerful than the Pi then the Udoo is well 
worth considering, power to price ratio is very much in Udoo's favour, but the 
Pi is certainly cheaper and physically smaller ... especially the A+ ..

- the arduino chip on the Udoo gives much wider possibilities re I/O especially 
if you are concerned with very low latency and jitter on those channels, I/O can 
go between chips or to either so you have lots of access to both chips.

- the quad-core Udoo processor would allow for a dedicated audio core if you 
wanted, by reserving one of the cores for the main Pd process

- the Udoo is much more open, there are much more detailed specs esp re the GPU

- the Udoo is based on the same chip series widely used in the faster tablets, 
they have debian and android images, and others

(I haven't checked out the newest Pi at all yet, it apparently has a very much 
more powerful processor so is quite a different beast)


Simon