The standard STM32F407 USB audio driver only supports 48k, is there any info available to up it to higher speed?

[Robmar]

The standard STM32F407 USB audio driver only supports 48k, is there any info available to up it to higher speed?

[Robmar]

Found it! In usbd_conf.h:-

#define USBD_AUDIO_FREQ   48000

Could it be as easy as just changing that to 96000, or 192000?

Could it be made selectable at boot time by replacing with a variable?

[Robmar]

Do you think I could set higher board rates in usbd_conf.h ?

#define USBD_AUDIO_FREQ   48000

[AScha.3]

see in main.c :

[Piranha]

> Not much of a description on that site

https://docs.tinyusb.org/en/latest/reference/getting_started.html

Together with the examples... enough for me.

> any idea what it does?

Isn't it obvious even by the folder name?

> Could it be as easy as just changing that to 96000, or 192000?

https://github.com/STMicroelectronics/STM32CubeF4/blob/e92669fc501fb8b7512fd6890a6eb379b6ae90c5/Middlewares/ST/STM32_USB_Device_Library/Class/AUDIO/Src/usbd_audio.c#L38

> Could it be made selectable at boot time by replacing with a variable?

Other people have already implemented that and more necessary features. That's why, instead of messing with a broken bloatware, they developed an actually usable USB stack, like TinyUSB.

> Worst case you get some blue screens

An externally connectable device cannot make BSOD. If it can, that's a bug in the host OS or drivers.

[Robmar]

All the STM32F407V-DISC1 Discovery boards world-wide have been sold out for some weeks, impossible to find apart from crazy prices from some Chinese suppliers!

[LCE]

>> Worst case you get some blue screens

> An externally connectable device cannot make BSOD. If it can, that's a bug in the host OS or drivers.

Well, that's my USB experience from about 15 years ago when working with Cypress FX2 and the Cypress driver and Windows x (was that still XP?).

At that time, one error in the descriptors and Windows was very blue...

[Piranha]

It's definitely a bug in some component. Most likely in the Cypress driver, less likely in a Windows integrated drivers or USB stack.

[Robmar]

Not sure the rtos overhead or memory requirements would fit unfortunately ​

[Robmar]

PC rejected it, bad wave format when set to anything above 47k

[AScha.3]

47k ?? you mean : 48k - right?