USB Audio Device - Stm32f4Discovery

[jbrandmeyer]

Any change re: isochronous endpoint support, or USB Audio Device class support? I'll note that the STM32F4Discovery and other boards have both digital PDM microphones and headphone jacks for testing purposes. I can contribute Apache-licensed PDM->PCM decimation code for the digital microphone if it'll help move this along.

[Giovanni]

Hi,

The driver still does not support isochronous endpoints, I am not sure about the amount of work required in order to introduce support.

There is an attached example application in this thread, it could be worth trying to understand where it fails after porting the descriptors in the newest ChibiOS.

Giovanni

[Giovanni]

I studied the documentation a bit, what is missing in the driver is the even/odd frames handling for OUT endpoints, the driver must set a flag manually depending on the frame number, this mean that the information about the last frame must be stored somewhere in the endpoint context.

Giovanni

[Spider]

Hello, Giovanni!

Any change re: isochronous endpoint support, or USB Audio Device class support?
I'm trying to make USB Microphone on STM32F103, but my device don't Configured my USB bus. Seem like usbInitEndpointI(usbp, AUDIO_STREAM_EPNUM, &epAudioconfig); have no effect.

[Giovanni]

I merged the proposed patch with no testing, please look at the demo posted at beginning

Giovanni