USB Audio Device/Host Class 2.0 Middleware support?

Graduate II

Imen.D, it's now 2023 and STM are still working in USB 2.0 now only for RTOS, what are we meant to think about this?

J

JoyabbAuthor

Visitor II

@Imen DAHMEN Is there a timeline available? This will help us plan a tentative project schedule.

I

Imen.D

Technical Moderator

Hi @Joyabb ,

It’s still under dev for the moment. I can't give you any target date for the moment.

Imen

https://github.com/bouffalolab/bouffalo_sdk/blob/master/components/usb/cherryusb/class/audio/usbh_audio.c

Graduate II

Very poor support from STM, they still don't have USB 2.0 class 2 support now in 2023, unlike NXP

P

Piranha

Graduate II

Just drop the broken bloatware and start using a decent software developed by people, who actually know what they are doing:

https://github.com/hathach/tinyusb

Post edited to adhere community guidelines.

A

AScha.3

Super User

...but also no audio host !

on tinyusb.

the only audio host i found is cherryusb ->

https://github.com/CherryUSB/cherryusb_apm32

for STM : https://github.com/CherryUSB/cherryusb_stm32

Graduate II

I looked now at that page, the readme has one line, not exactly encouraging. Have you got it working on an H-series for 192KHz+ audio streaming?

ST Employee

USB Audio UAC 2.0 is supported in USBX class in both Device and Host modes (GitHub or from X-CUBE-AZRTOS package, or from STM32U5/STM32H5 CubeFW packages or STM32CubeMX).

Latest version (6.2.1) of USBX Middleware available here: USBX GitHub

btw, USB Audio UAC2.0 (Device only) available also on Classic CoreMW USB class (legacy) on X-CUBE-USB-AUDIO

S

SP9WB

Visitor II

Where is UAC2.0 on Device only ? On official website X-CUBE-USB-AUDIO is old UAC1.0 ...

Hello ST? Few months and you didn't change it ?

ST Employee

Hi @Robmar , yes 192KHz is supported

ST Employee

Yes, I confirm that standalone mode (ie. without RTOS) is not supported yet for the audio class. I can't provide a committed plan to offer this option.

ST Employee

After a deeper discussion with the team we confirm following points:

We will provide an alpha example implementation of the USBX Host Audio2.0 on GitHub in the coming 2 weeks.
We confirm that it is not possible to implement USB Host Audio (or Video) without RTOS usage unless changing deeply the USB Audio Class implementation in the stack. So, RTOS is mandatory when using Audio or Video classes (at least with current implementation of the stacks).

A

AScha.3

Super User

ok, i installed Azure rtos and enabled audio/host , on new H563-nucleo 144 board.

fine, compile, no errors. no work also. there is nothing, than set up , no enumeration, no functions are called, the name "audio host " is all.

looking at MS original Azure examples, this seems like a copy. But i didnt find a working example.

so how to find out, which functions to call, without an example ?

Is there any working example from STM ? i didnt find it. i might giving up now, to do any audio host with STM.

https://www.gd32mcu.com/en/download/0?kw=GD32H7

Graduate II

I've been discussing USB support with STM support for over a month as I also found no useful examples, and the USB middleware installed for the H7 is very incomplete.

Yesterday I was informed that STM hope to have the USBX UAC 2 driver for AzRTOS H7 ready by the end of this year, 2023, but it might slip to next year.

What surprised me was that STM haven't had a USB UAC 2 driver available long ago, as UAC 3.0 is already available.

It seems that the USB support is outsourced and STM staff haven't pushed it. There seems to be a minimal investment in support software for their MCUs, which is a shame because if they hang around too long, the Raspberry market is liable to take much of STM's MCU market share as it is now heavily focusing on embedded IoT, industrial and AI.

A

AScha.3

Super User

full consent.

what i found so far:

in STM audio host :

so (if i am right) this can only connect to a headset, as is a demo for the H7..dk board. thats it.

and in Azure audio host:

so this might connect to most "typical" audio devices... if you get it running !

because the state machine (or however its called) is empty:

so maybe (!) with a lot of searching and try and error can find some useful things...like:

we will see. :)

+ about the market: i think, the Raspberry or Arduino market is big, but not for industrial applications .

BUT sooner or later other companies will ( or already do ) make very similar cpu , even pin and function compatible : see Nuvotron F4 series or GigaDevice H723 ...

https://direct.nuvoton.com/de/numaker-m463kg

STM is not world market leader by law . :)

Graduate II

Interesting, the GDI H7 has up to 3MB of flash, not bad at all, just a pity they couldn't double the RAM to 2MB!

I agree with you about the competition, ST need to move fast or they risk losing market share. Mouser have just taken on the new Raspberry PI boards, which are industrialized with a lot of IO and full USB UAC 2 support, and of course AI is fully supported for IoT given it runs linux on the quad core A53 processor. All it lacks is the 16-bit ADCs.