//引用在USBfunctions.c中定義的全局變量的外部聲明
typedef struct flags
{
	unsigned char bus_reset;	    //總線復(fù)位標志
	unsigned char suspend;	            //掛起改變標志
	unsigned char setup_packet;	    //收到SETUP包
	unsigned char remote_wakeup;
	unsigned char in_isr;	            //USB中斷服務(wù)標志
	unsigned char control_state;	    //控制端點處理標志
													//0: IDLE	   空閑狀態(tài)
													//1: TRANSMIT  數(shù)據(jù)發(fā)送狀態(tài)
													//2: RECEIVE   數(shù)據(jù)接收狀態(tài)
 	unsigned char configuration;	    //配置標志(0: 未配置; 1: 已經(jīng)配置)		
	unsigned char ep1_rxdone;	    //端點 1 收到數(shù)據(jù)標志
	unsigned char ep2_rxdone;	    //端點 2 收到數(shù)據(jù)標志
	unsigned char ep2buf_full;	    //端點 2 接收雙緩沖區(qū)滿標志
} All_Usb_Flags;

extern All_Usb_Flags USB_FLAG;     
extern unsigned char Ep1Buf[16];			//端點1接收緩沖區(qū)
extern unsigned char Ep2Buf[64];			//端點2接收緩沖區(qū)

#define INT_ENDP0OUT		        0x01
#define INT_ENDP0IN			0x02
#define INT_ENDP1OUT	                0x04
#define INT_ENDP1IN			0x08
#define INT_ENDP2OUT		        0x10
#define INT_ENDP2IN			0x20
#define INT_BUSRESET		        0x40
#define INT_SUSPENDCHANGE	        0x80