diff --git a/tests/lpc18xx_43xx/test/host/ehci/test_pipe_bulk_xfer.c b/tests/lpc18xx_43xx/test/host/ehci/test_pipe_bulk_xfer.c
index ccf30d724..ff68be458 100644
--- a/tests/lpc18xx_43xx/test/host/ehci/test_pipe_bulk_xfer.c
+++ b/tests/lpc18xx_43xx/test/host/ehci/test_pipe_bulk_xfer.c
@@ -208,7 +208,7 @@ void test_bulk_xfer_complete_isr(void)
   ehci_qtd_t* p_head = p_qhd_bulk->p_qtd_list_head;
   ehci_qtd_t* p_tail = p_qhd_bulk->p_qtd_list_tail;
 
-  usbh_isr_Expect(pipe_hdl_bulk, TUSB_CLASS_MSC, TUSB_EVENT_XFER_COMPLETE);
+  usbh_xfer_isr_Expect(pipe_hdl_bulk, TUSB_CLASS_MSC, TUSB_EVENT_XFER_COMPLETE);
 
   //------------- Code Under Test -------------//
   ehci_controller_run(hostid);
diff --git a/tests/lpc18xx_43xx/test/host/ehci/test_pipe_control_xfer.c b/tests/lpc18xx_43xx/test/host/ehci/test_pipe_control_xfer.c
index 266cf0ef2..bb1ca6692 100644
--- a/tests/lpc18xx_43xx/test/host/ehci/test_pipe_control_xfer.c
+++ b/tests/lpc18xx_43xx/test/host/ehci/test_pipe_control_xfer.c
@@ -227,7 +227,7 @@ void test_control_xfer_complete_isr(void)
 {
   TEST_ASSERT_STATUS( hcd_pipe_control_xfer(dev_addr, &request_get_dev_desc, xfer_data) );
 
-  usbh_isr_Expect(((pipe_handle_t){.dev_addr = dev_addr}), 0, TUSB_EVENT_XFER_COMPLETE);
+  usbh_xfer_isr_Expect(((pipe_handle_t){.dev_addr = dev_addr}), 0, TUSB_EVENT_XFER_COMPLETE);
 
   //------------- Code Under TEST -------------//
   ehci_controller_run(hostid);
@@ -245,7 +245,7 @@ void test_control_xfer_error_isr(void)
 {
   TEST_ASSERT_STATUS( hcd_pipe_control_xfer(dev_addr, &request_get_dev_desc, xfer_data) );
 
-  usbh_isr_Expect(((pipe_handle_t){.dev_addr = dev_addr}), 0, TUSB_EVENT_XFER_ERROR);
+  usbh_xfer_isr_Expect(((pipe_handle_t){.dev_addr = dev_addr}), 0, TUSB_EVENT_XFER_ERROR);
 
   //------------- Code Under TEST -------------//
   ehci_controller_run_error(hostid);
diff --git a/tests/lpc18xx_43xx/test/host/ehci/test_pipe_interrupt_xfer.c b/tests/lpc18xx_43xx/test/host/ehci/test_pipe_interrupt_xfer.c
index f72b5d3ae..d367292a8 100644
--- a/tests/lpc18xx_43xx/test/host/ehci/test_pipe_interrupt_xfer.c
+++ b/tests/lpc18xx_43xx/test/host/ehci/test_pipe_interrupt_xfer.c
@@ -200,7 +200,7 @@ void test_interrupt_xfer_complete_isr_interval_less_than_1ms(void)
 
   TEST_ASSERT_STATUS( hcd_pipe_xfer(pipe_hdl_interrupt, data2, sizeof(data2), true) );
 
-  usbh_isr_Expect(pipe_hdl_interrupt, TUSB_CLASS_HID, TUSB_EVENT_XFER_COMPLETE);
+  usbh_xfer_isr_Expect(pipe_hdl_interrupt, TUSB_CLASS_HID, TUSB_EVENT_XFER_COMPLETE);
 
   ehci_qtd_t* p_head = p_qhd_interrupt->p_qtd_list_head;
   ehci_qtd_t* p_tail = p_qhd_interrupt->p_qtd_list_tail;
diff --git a/tinyusb/class/cdc_host.h b/tinyusb/class/cdc_host.h
index a40cea64e..5eee3670b 100644
--- a/tinyusb/class/cdc_host.h
+++ b/tinyusb/class/cdc_host.h
@@ -57,6 +57,11 @@
 //--------------------------------------------------------------------+
 // APPLICATION PUBLIC API
 //--------------------------------------------------------------------+
+bool tusbh_cdc_acm_is_mounted(uint8_t dev_addr) ATTR_PURE ATTR_WARN_UNUSED_RESULT;
+bool tusbh_cdc_serial_is_mounted(uint8_t dev_addr) ATTR_PURE ATTR_WARN_UNUSED_RESULT;
+bool tusbh_cdc_rndis_is_mounted(uint8_t dev_addr) ATTR_PURE ATTR_WARN_UNUSED_RESULT;
+
+tusb_interface_status_t tusbh_cdc_send(void const * p_data, uint32_t length);
 
 //--------------------------------------------------------------------+
 // USBH-CLASS API
diff --git a/tinyusb/host/ehci/ehci.c b/tinyusb/host/ehci/ehci.c
index 0a15f9355..cbac11c99 100644
--- a/tinyusb/host/ehci/ehci.c
+++ b/tinyusb/host/ehci/ehci.c
@@ -519,19 +519,24 @@ void async_list_process_isr(ehci_qhd_t * const async_head)
       {
         // TD need to be freed and removed from qhd, before invoking callback
         bool is_ioc = (p_qhd->p_qtd_list_head->int_on_complete != 0);
+        uint16_t actual_bytes_xferred = p_qhd->p_qtd_list_head->expected_bytes - p_qhd->p_qtd_list_head->total_bytes;
 
         p_qhd->p_qtd_list_head->used = 0; // free QTD
         qtd_remove_1st_from_qhd(p_qhd);
 
         if (is_ioc) // end of request
         {
-          pipe_handle_t pipe_hdl = { .dev_addr = p_qhd->device_address };
+          pipe_handle_t pipe_hdl = {
+              .dev_addr  = p_qhd->device_address,
+              .xfer_type = TUSB_XFER_CONTROL
+          };
+
           if (p_qhd->endpoint_number) // if not Control, can only be Bulk
           {
             pipe_hdl.xfer_type = TUSB_XFER_BULK;
             pipe_hdl.index = qhd_get_index(p_qhd);
           }
-          usbh_isr( pipe_hdl, p_qhd->class_code, TUSB_EVENT_XFER_COMPLETE); // call USBH callback
+          usbh_xfer_isr( pipe_hdl, p_qhd->class_code, TUSB_EVENT_XFER_COMPLETE); // call USBH callback
         }
 
       }
@@ -572,7 +577,7 @@ void period_list_process_isr(uint8_t hostid, uint8_t interval_ms)
 
             if (is_ioc) // end of request
             {
-              usbh_isr( (pipe_handle_t)
+              usbh_xfer_isr( (pipe_handle_t)
                         {
                               .dev_addr = p_qhd_int->device_address,
                               .xfer_type = TUSB_XFER_INTERRUPT,
@@ -617,13 +622,17 @@ void xfer_error_isr(uint8_t hostid)
       p_qhd->p_qtd_list_head->used = 0; // free QTD
       qtd_remove_1st_from_qhd(p_qhd);
 
-      pipe_handle_t pipe_hdl = { .dev_addr = p_qhd->device_address };
+      pipe_handle_t pipe_hdl = {
+          .dev_addr  = p_qhd->device_address,
+          .xfer_type = TUSB_XFER_CONTROL
+      };
+
       if (p_qhd->endpoint_number) // if not Control, can only be Bulk
       {
         pipe_hdl.xfer_type = TUSB_XFER_BULK;
-        pipe_hdl.index = qhd_get_index(p_qhd);
+        pipe_hdl.index     = qhd_get_index(p_qhd);
       }
-      usbh_isr( pipe_hdl, p_qhd->class_code, TUSB_EVENT_XFER_ERROR); // call USBH callback
+      usbh_xfer_isr( pipe_hdl, p_qhd->class_code, TUSB_EVENT_XFER_ERROR); // call USBH callback
     }
 
     p_qhd = (ehci_qhd_t*) align32(p_qhd->next.address);
diff --git a/tinyusb/host/ehci/ehci.h b/tinyusb/host/ehci/ehci.h
index 79526079f..ab2571df9 100644
--- a/tinyusb/host/ehci/ehci.h
+++ b/tinyusb/host/ehci/ehci.h
@@ -128,6 +128,8 @@ typedef struct {
 	  struct {
 	    uint32_t      : 5;
 	    uint32_t used : 1;
+	    uint32_t : 10;
+	    uint32_t expected_bytes : 16;
 	  };
 	};
 
diff --git a/tinyusb/host/usbh.c b/tinyusb/host/usbh.c
index 628cf637a..e4c20883b 100644
--- a/tinyusb/host/usbh.c
+++ b/tinyusb/host/usbh.c
@@ -236,7 +236,7 @@ tusb_interface_status_t usbh_pipe_status_get(pipe_handle_t pipe_hdl)
 // USBH-HCD ISR/Callback API
 //--------------------------------------------------------------------+
 // interrupt caused by a TD (with IOC=1) in pipe of class class_code
-void usbh_isr(pipe_handle_t pipe_hdl, uint8_t class_code, tusb_event_t event)
+void usbh_xfer_isr(pipe_handle_t pipe_hdl, uint8_t class_code, tusb_event_t event)
 {
   uint8_t class_index = std_class_code_to_index(class_code);
   if (class_index == 0) // Control transfer
diff --git a/tinyusb/host/usbh_hcd.h b/tinyusb/host/usbh_hcd.h
index fbb7379a7..c8b0a9f4a 100644
--- a/tinyusb/host/usbh_hcd.h
+++ b/tinyusb/host/usbh_hcd.h
@@ -113,7 +113,7 @@ extern usbh_device_info_t usbh_devices[TUSB_CFG_HOST_DEVICE_MAX+1]; // including
 //--------------------------------------------------------------------+
 // callback from HCD ISR
 //--------------------------------------------------------------------+
-void usbh_isr(pipe_handle_t pipe_hdl, uint8_t class_code, tusb_event_t event);
+void usbh_xfer_isr(pipe_handle_t pipe_hdl, uint8_t class_code, tusb_event_t event);
 void usbh_device_plugged_isr(uint8_t hostid);
 void usbh_device_unplugged_isr(uint8_t hostid);