Implementing USB Audio / HID

[joseph.anand]

Most microcontrollers will not support USB 2.0 High speed (their clock speeds are too low to handle) which is what you will need to be able to implement UAC2. Instead try using the Beaglebone/Beaglebone black (https://groups.google.com/d/topic/beagleboard/qdLcceqH3ms). Also avoid using multiple codecs and decide on one that supports multiple audio input/outputs like the Analog Device's AD193x series (http://www.analog.com/en/codec-afe-mxfe/audio-codecs/ad1937/products/product.html) or the TI's PCM3168A .

I've come to the same conclusion (as a plan). I am going to use 4 CS4270 chips and some sort of FPGA or microcontroller to interface the chips to the PC. My problem is that there doesn't seem to be much information on which boards support UAC1, UAC2, isochronous transfers, or USB communication in general...

[ve7xen]

USB2-HS is not required for UAC2.

[MLM]

Instead try using the Beaglebone/Beaglebone black (https://groups.google.com/d/topic/beagleboard/qdLcceqH3ms). Also avoid using multiple codecs and decide on one that supports multiple audio input/outputs like the Analog Device's AD193x series (http://www.analog.com/en/codec-afe-mxfe/audio-codecs/ad1937/products/product.html) or the TI's PCM3168A .

Multiple people have mentioned the Beaglebone Black but I have found no information on using it as a USB peripheral, UAC 1.0. Maybe it is because I do not have it in hand or used it before but could someone explain how to implement this functionality. I am guessing you have to use the USB client port on the bottom.

[elektrinis]

Old topic. Anyone managed to pull off an easy multichannel I2S solution?
I am interested in a 5.1 audio amp with I2S class-D power stages, so no analog signals inside.

[EverydayMuffin]

Old topic. Anyone managed to pull off an easy multichannel I2S solution?
I am interested in a 5.1 audio amp with I2S class-D power stages, so no analog signals inside.

I would think the XMOS xcore-200 devices would be perfect for this application?

https://www.xmos.ai/xcore-200/

[ua1arn]

I can share own USB descriptors as example...
https://github.com/ua1arn/hftrx/blob/master/src/usb/usbd_descriptors.c
At OUT direction no feedback methods utilized, only resampling.

[Doctorandus_P]

Have you thought about using a complete Linux PC as your sound device?

With USB OTG it can be used as a USB device to your windows USB Host, and there is all kinds of software for audio manipulation for Linux available. You can do most software development on a regular Linux box, or emulator or VM in Windows.

A potential problem with with any digital audio is latency. An AES/EBU or S/Pdif stream has very low latency, but when you add buffering of data, extra buffers for changing protocols such as going to USB, and buffers needed to do actual filtering, then they all add up.

Relating to this question also "minidsp" popped up in my memory:
https://www.minidsp.com/
It's just an example, other companies make similar products.

[ve7xen]

Old topic. Anyone managed to pull off an easy multichannel I2S solution?
I am interested in a 5.1 audio amp with I2S class-D power stages, so no analog signals inside.

You can buy an XMOS solution off the shelf from DIYINHK for example https://www.diyinhk.com/shop/eol-product/101-xmos-multichannel-high-quality-usb-tofrom-i2sdsd-spdif-pcb.html

Implementing the XMOS reference code for UAC2 if you wanted to design your own isn't too terribly difficult either.

[SiliconWizard]

The OP can also refer to this thread: https://www.eevblog.com/forum/microcontrollers/usb-audio-class-2-0-on-a-microcontroller/