void USBDeviceEndPointCfg()
{
    UEP1_DMA = Ep1Buffer;                                                      //Endpoint 1 sends the data transfer address
    UEP2_DMA = Ep2Buffer;                                                      //Endpoint 2 IN data transfer address
    UEP2_3_MOD = 0xCC;                                                         //Endpoint 2/3 Single Buffer Transceiver Enable
    UEP2_CTRL = bUEP_AUTO_TOG | UEP_T_RES_NAK | UEP_R_RES_ACK;                 //Endpoint 2 automatically flips the sync flag, IN 
                                                                                //transaction returns NAK, OUT returns ACK

    UEP1_CTRL = bUEP_AUTO_TOG | UEP_T_RES_NAK;                                 //Endpoint 1 automatically flips the sync flag, 
                                                                               //and the IN transaction returns NAK.
    UEP0_DMA = Ep0Buffer;                                                      //Endpoint 0 data transfer address
    UEP4_1_MOD = 0X40;                                                         //Endpoint 1 upload buffer; endpoint 0 single 64 byte send and receive buffer
    UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;                                 //Manual flip, OUT transaction returns ACK, IN transaction returns NAK
}

//Configuration descriptor, interface descriptor, endpoint descriptor
UINT8C CfgDesc[39]={0x09,0x02,0x27,0x00,0x01,0x01,0x00,0x80,0xf0,         
                    0x09,0x04,0x00,0x00,0x03,0xff,0x01,0x02,0x00,           
                    0x07,0x05,0x82,0x02,0x20,0x00,0x00,                  //Bulk upload endpoint
                    0x07,0x05,0x02,0x02,0x20,0x00,0x00,                  //Batch downlink endpoint    
                    0x07,0x05,0x81,0x03,0x08,0x00,0x01};                 //Interrupt upload endpoint

 case UIS_TOKEN_OUT | 2:                                                 //Endpoint 2# Endpoint Batch Down
            if ( U_TOG_OK )                                                     // Out of sync packets will be dropped
            {
                len = USB_RX_LEN;                                               //Receive data length, data is stored from the first address of Ep2Buffer
            	  printf( "\nlen=%u\n",(UINT8)len );
                for ( i = 0; i < len; i ++ )
                {
                    Ep2Buffer[MAX_PACKET_SIZE+i] = Ep2Buffer[i];         // OUT data is inverted to IN verified by computer
                	  printf( "%c",Ep2Buffer[i]);
                }
                UEP2_T_LEN = len;
                UEP2_CTRL = UEP2_CTRL & ~ MASK_UEP_T_RES | UEP_T_RES_ACK;       // Allow upload
            }