.ProductStrIndex        = 0x02,\r
        .SerialNumStrIndex      = NO_DESCRIPTOR,\r
                \r
-       .NumberOfConfigurations = 1\r
+       .NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS\r
 };\r
 \r
 /** Configuration descriptor structure. This descriptor, located in FLASH memory, describes the usage\r
        .ManagementEndpoint = \r
                {\r
                        .Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},\r
-                                                                                \r
+                       \r
                        .EndpointAddress        = (ENDPOINT_DESCRIPTOR_DIR_IN | CDC_NOTIFICATION_EPNUM),\r
-                       .Attributes             = EP_TYPE_INTERRUPT,\r
+                       .Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),\r
                        .EndpointSize           = CDC_NOTIFICATION_EPSIZE,\r
                        .PollingIntervalMS      = 0x02\r
                },\r
        .DataOutEndpoint = \r
                {\r
                        .Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},\r
-                                                                                \r
+                        \r
                        .EndpointAddress        = (ENDPOINT_DESCRIPTOR_DIR_OUT | CDC_RX_EPNUM),\r
-                       .Attributes             = EP_TYPE_BULK,\r
+                       .Attributes             = (EP_TYPE_BULK | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),\r
                        .EndpointSize           = CDC_TXRX_EPSIZE,\r
                        .PollingIntervalMS      = 0x00\r
                },\r
        .DataInEndpoint = \r
                {\r
                        .Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},\r
-                                                                                \r
+                       \r
                        .EndpointAddress        = (ENDPOINT_DESCRIPTOR_DIR_IN | CDC_TX_EPNUM),\r
-                       .Attributes             = EP_TYPE_BULK,\r
+                       .Attributes             = (EP_TYPE_BULK | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),\r
                        .EndpointSize           = CDC_TXRX_EPSIZE,\r
                        .PollingIntervalMS      = 0x00\r
                }\r