static assert to check OSAL_QUEUE_DEF's queue_depth parameter < 256

enable HOST_HCD_XFER_INTERRUPT by default (previously only enabled with HID), as it is widely used
implement tusbh_cdc_is_busy
add compilation switch in usbh enumeration for hub
rewrite CDC serial application to address usb-serial race condition

tinyusb/host/usbh.c

@@ -392,6 +392,7 @@ tusb_error_t enumeration_body_subtask(void)
       SUBTASK_EXIT(TUSB_ERROR_NONE); // restart task
     }
   }
+  #if TUSB_CFG_HOST_HUB
   else
   { // connected/disconnected via hub
     //------------- Get Port Status -------------//
@@ -428,6 +429,7 @@ tusb_error_t enumeration_body_subtask(void)
       OSAL_SUBTASK_INVOKED_AND_WAIT( hub_port_clear_feature_subtask(usbh_devices[0].hub_addr, usbh_devices[0].hub_port, HUB_FEATURE_PORT_RESET_CHANGE), error );
     }
   }
+  #endif
 
   SUBTASK_ASSERT_STATUS( usbh_pipe_control_open(0, 8) );
   usbh_devices[0].state = TUSB_DEVICE_STATE_ADDRESSED;
@@ -446,7 +448,9 @@ tusb_error_t enumeration_body_subtask(void)
     SUBTASK_ASSERT_STATUS(error); // TODO some slow device is observed to fail the very fist controller xfer, can try more times
     hcd_port_reset( usbh_devices[0].core_id ); // reset port after 8 byte descriptor
 //  osal_task_delay(50); // TODO reset is recommended to last 50 ms (NXP EHCI passes this)
-  }else
+  }
+  #if TUSB_CFG_HOST_HUB
+  else
   { // connected via a hub
     SUBTASK_ASSERT_STATUS_WITH_HANDLER(error, hub_status_pipe_queue( usbh_devices[0].hub_addr) ); // TODO hub refractor
     OSAL_SUBTASK_INVOKED_AND_WAIT ( hub_port_reset_subtask(usbh_devices[0].hub_addr, usbh_devices[0].hub_port), error );
@@ -458,6 +462,7 @@ tusb_error_t enumeration_body_subtask(void)
 
     (void) hub_status_pipe_queue( usbh_devices[0].hub_addr ); // done with hub, waiting for next data on status pipe
   }
+  #endif
 
   //------------- Set new address -------------//
   new_addr = get_new_address();