How to use Recv() in USBCore.cpp

Using Arduino Microcontrollers
1

Hello,

I seen that when PC send something to my Arduino, it activate this function into USBCore.cpp

static inline void Recv(volatile u8* data, u8 count)
{
	while (count--)
		*data++ = UEDATX;
	
	RXLED1;					// light the RX LED
	RxLEDPulse = TX_RX_LED_PULSE_MS;	
}

I don't know which function call this function, but I think it's an interrupt one, do you know how to use this function ?