//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中斷服務標志
	unsigned char control_state;	    //控制端點處理標志
													//0: IDLE	   空閑狀態
													//1: TRANSMIT  數據發送狀態
													//2: RECEIVE   數據接收狀態
 	unsigned char configuration;	    //配置標志(0: 未配置; 1: 已經配置)		
	unsigned char ep1_rxdone;	    //端點 1 收到數據標志
	unsigned char ep2_rxdone;	    //端點 2 收到數據標志
	unsigned char ep2buf_full;	    //端點 2 接收雙緩沖區滿標志
} All_Usb_Flags;

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

#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