-#define USBCAN_MESSAGE_FREE (1)
-#define USBCAN_MESSAGE_READY_TO_SEND (2)
-#define USBCAN_MESSAGE_SENDING (3)
-#define USBCAN_MESSAGE_TERMINATE (4)
-#define USBCAN_MESSAGE_ERROR (5)
-#define USBCAN_MESSAGE_DATA_READ (6)
-
-#define USBCAN_TOT_RX_URBS 8
-#define USBCAN_TOT_TX_URBS 8
+#define USBCAN_MESSAGE_FREE (1)
+#define USBCAN_MESSAGE_URB_PENDING (2)
+#define USBCAN_MESSAGE_TERMINATE (3)
+#define USBCAN_MESSAGE_ERROR (4)
+#define USBCAN_MESSAGE_DATA_OK (5)
+#define USBCAN_MESSAGE_TYPE_RX (6)
+#define USBCAN_MESSAGE_TYPE_TX (7)