Added >64 byte USB_RecvControl() support

Author: NicoHood

Diff for: hardware/arduino/avr/cores/arduino/USBCore.cpp

@@ -425,13 +425,24 @@ static bool USB_SendStringDescriptor(const u8*string_P, u8 string_len, uint8_t f
 }
 
 //	Does not timeout or cross fifo boundaries
-//	Will only work for transfers <= 64 bytes
-//	TODO
 int USB_RecvControl(void* d, int len)
 {
-	WaitOUT();
-	Recv((u8*)d,len);
-	ClearOUT();
+	auto length = len;
+	while(length)
+	{
+		// Dont receive more than the USB Control EP has to offer
+		// Use fixed 64 because control EP always have 64 bytes even on 16u2.
+		auto recvLength = length;
+		if(recvLength > 64){
+			recvLength = 64;
+		}
+		length -= recvLength;
+
+		// Write data to fit to the end (not the beginning) of the array
+		WaitOUT();
+		Recv((u8*)d + length, recvLength);
+		ClearOUT();
+	}
 	return len;
 }