How stm32wb usb to active usb test mode for eye diagram measuring?

[akckwang]

Hi,

Our project adopt stm32wb35cc, since we need to measure usb diagram,

so we do like to consult that how to active usb test mode?

any document describe that?

I found a function USBD_RunTestMode(), but it's empty and do nothing?

is't need to implement code of USBD_RunTestMode() for eye diagram?

Thanks~