Dmitry Panin

I am developing a open-source project of DDC/SDR Radio, and I plan to make sound output through USB. Also, now the project has 2 virtual COM ports for debugging output...

Thank you for the information provided! Descriptors are successfully registered and the device is detected. But the isochronous transfer does not occur, the data is not transmitted. class file https://github.com/XGudron/UA3REO-DDC-Transceiver/blob/master/STM32/USBDevice/Class/AUDIO/usbd_audio.c...

https://github.com/XGudron/UA3REO-DDC-Transceiver/blob/1.4/STM32/USBDevice/Class/AUDIO/usbd_audio.c https://github.com/XGudron/UA3REO-DDC-Transceiver/blob/1.4/STM32/USBDevice/Include/usbd_audio.h I could not make isochronous transfers, I had to rewrite the standard solution from stm32cube to the composite structure (CDC+CDC+Audio). https://github.com/XGudron/UA3REO-DDC-Transceiver/blob/master/STM32/Src/usbd_ua3reo.c

Exactly, thank you! my mistake...