// Clear the data toggle bit to (set to 0) and clear buffers before clear stall of
// the endpoint.
wEPCFG = ISP1581_GetEndpointConfig(endp);
ISP1581_SetEndpointConfig(endp, 0); // disable endpoint *
// Enable endpoint, clear the buffer and set the data toggle bit to 0.
ISP1581_SetEndpointConfig(endp, wEPCFG);
ISP1581_SetEndpointStatus(endp, 0); // clear the Stall condition of the
//endpoint.
Chap9_ControlWriteHandshake();

CONFIGURATION_DESCRIPTOR config_descriptor = {
        SIZEOF_USB_CONFIGURATION_DESCRIPTOR,//...bLength
        USB_CONFIGURATION_DESCRIPTOR_TYPE,  //...bDescriptorType
        CONFIG_DESCRIPTOR_LENGTH,
        0,                             //...wTotalLength
        0x01,                               //...bNumInterfaces
        0x01,                               //...bConfigurationValue
        0x00,                               //...iConfiguration
        0x60,                               //...bmAttributes
        0x01                               //...MaxPower
};  

INTERFACE_DESCRIPTOR interface_descriptor = {
        SIZEOF_USB_INTERFACE_DESCRIPTOR,    //...bLength
        USB_INTERFACE_DESCRIPTOR_TYPE,      //...bDescriptorType
        0x00,                               //...bInterfaceNumber
        0x00,                               //...bAlternateSetting
        NUM_ENDPOINTS,                      //...bNumEndpoints
        USB_CLASS_CODE_TEST_CLASS_DEVICE,   //...bInterfaceClass
        USB_SUBCLASS_CODE_TEST_CLASS,       //...bInterfaceSubClass
        USB_PROTOCOL_CODE_TEST_CLASS,       //...bInterfaceProtocol
        0x00                               //...iInterface
};  

ENDPOINT_DESCRIPTOR EP2_TXDescr = {
        SIZEOF_USB_ENDPOINT_DESCRIPTOR,     //...bLength
        USB_ENDPOINT_DESCRIPTOR_TYPE,       //...bDescriptorType
        0x82,                               //...bEndpointAddress
        USB_ENDPOINT_TYPE_BULK,                 //...bmAttributes
        EP2_PACKET_SIZE&0xff,EP2_PACKET_SIZE/256,//...wMaxPacketSize    
//      0x20,0x3,                           //...wMaxPacketSize
        0x0A                               //...bInterval
};        
        
ENDPOINT_DESCRIPTOR EP2_RXDescr = {
        SIZEOF_USB_ENDPOINT_DESCRIPTOR,     //...bLength
        USB_ENDPOINT_DESCRIPTOR_TYPE,       //...bDescriptorType
        0x02,                               //...bEndpointAddress
        USB_ENDPOINT_TYPE_BULK,                             //...bmAttributes
        EP2_PACKET_SIZE&0xff,EP2_PACKET_SIZE/256,               //...wMaxPacketSize    
//      0x40,0x4,                           //...wMaxPacketSize
        0x0A                               //...bInterval
};