On reading about usb protocol in http://www.beyondlogic.org/usbnutshell/usb4.shtml It is said that interrupt endpoint is unidirectional and periodic.
Yet, I see in the description for IN interrupt endpoint, that host initiate the IN token and then data packet is send from device to host
"If an interrupt has been queued by the device, the function will send a data packet containing data relevant to the interrupt when it receives the IN Token.".
So, If the data packet is sent on this IN endpoint from device to host, doesn't it mean that the same endpoint is used both the transmit and receive ?