Device: STM32F411RE NUCLEO
Hello, I am having some issues with STM USBD AUDIO library. For some reason I cannot get it to stream audio data to a host device in a proper way.
The device is successfully recognized as 2 channel 16 bit microphone by my PC.
When I press the record button in windows recorder or audacity nothing happens.
So far all I know is the USBD_AUDIO_DataIn is not getting called and from what I have read so far this is the function where I am supposed to be handling the sending data to host.
I have been trying to get this working for weeks and I have had it working in the past with the following conditions: I put the LL_Transmit function in the USBD_AUDIO_SOF function. This worked as the audio data is supposed to get polled every 1ms anyway. Then I had the problem that every other packet sent was empty, so I added the LL_Transmit function back into DataIn stage and now my sine wave was being sent perfectly. Which is really weird if you think about it. I cannot imagine that the library was designed to be used this way.
The weird thing is, if I do not use the SOF cb the DataIn stage is also not called.
I tried reading documentation but I just don't get this code. Too many layers too much stuff, and fully implemented for only speakers class so I constantly need to back up my workspace in case I do any "code generation" since I cannot work in the STM pre-approved user code spaces. Honestly I feel like throwing this whole library except the USB descriptors in the thrash. I mean previously I have also found the RM and registers much easyer to work with that STM Libraries and LL/HAL documentation. I'll just tell my boss to screw him and his time constraints. Since i'm not getting anywhere anyway.
Unless anyone here has some experience with this library and could tell me what I am doing wrong.
EDIT:::
Here is a picture of some code where I am trying to send just a single array over and over again.
Here follows a picture of wireshank showing empty packets:
all packets are empty.
why?
