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

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~

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