diff --git a/demos/host/src/cdc_serial_app.c b/demos/host/src/cdc_serial_app.c
index 5a5733c9c..cd58da74d 100644
--- a/demos/host/src/cdc_serial_app.c
+++ b/demos/host/src/cdc_serial_app.c
@@ -70,7 +70,7 @@ void tusbh_cdc_unmounted_isr(uint8_t dev_addr)
   // application tear-down
 }
 
-void tusbh_cdc_isr(uint8_t dev_addr, tusb_event_t event)
+void tusbh_cdc_xfer_isr(uint8_t dev_addr, tusb_event_t event, cdc_pipeid_t pipe_id, uint32_t xferred_bytes)
 {
   switch(event)
   {
@@ -83,7 +83,9 @@ void tusbh_cdc_isr(uint8_t dev_addr, tusb_event_t event)
       tusbh_cdc_receive(dev_addr, buffer_in, sizeof(buffer_in), true); // ignore & continue
     break;
 
+    case TUSB_EVENT_XFER_STALLED:
     default :
+      ASSERT(false, (void) 0); // error
     break;
   }
 }
diff --git a/demos/host/src/main.c b/demos/host/src/main.c
index 51148d052..6c15c024b 100644
--- a/demos/host/src/main.c
+++ b/demos/host/src/main.c
@@ -52,6 +52,7 @@
 
 #include "mouse_app.h"
 #include "keyboard_app.h"
+#include "cdc_serial_app.h"
 
 #if defined(__CODE_RED)
   #include <cr_section_macros.h>
diff --git a/tests/lpc18xx_43xx/test/host/hid/test_hidh_keyboard.c b/tests/lpc18xx_43xx/test/host/hid/test_hidh_keyboard.c
index 62bcc8b45..733c1ab73 100644
--- a/tests/lpc18xx_43xx/test/host/hid/test_hidh_keyboard.c
+++ b/tests/lpc18xx_43xx/test/host/hid/test_hidh_keyboard.c
@@ -215,7 +215,7 @@ void test_keyboard_isr_event_complete(void)
   tusbh_hid_keyboard_isr_Expect(dev_addr, TUSB_EVENT_XFER_COMPLETE);
 
   //------------- Code Under TEST -------------//
-  hidh_isr(p_hidh_kbd->pipe_hdl, TUSB_EVENT_XFER_COMPLETE);
+  hidh_isr(p_hidh_kbd->pipe_hdl, TUSB_EVENT_XFER_COMPLETE, 8);
 
   tusbh_device_get_state_IgnoreAndReturn(TUSB_DEVICE_STATE_CONFIGURED);
   TEST_ASSERT_EQUAL(TUSB_INTERFACE_STATUS_COMPLETE, tusbh_hid_keyboard_status(dev_addr));
diff --git a/tests/lpc18xx_43xx/test/host/hid/test_hidh_mouse.c b/tests/lpc18xx_43xx/test/host/hid/test_hidh_mouse.c
index 0156f5a58..88aa9351f 100644
--- a/tests/lpc18xx_43xx/test/host/hid/test_hidh_mouse.c
+++ b/tests/lpc18xx_43xx/test/host/hid/test_hidh_mouse.c
@@ -205,7 +205,7 @@ void test_mouse_isr_event_xfer_complete(void)
   tusbh_hid_mouse_isr_Expect(dev_addr, TUSB_EVENT_XFER_COMPLETE);
 
   //------------- Code Under TEST -------------//
-  hidh_isr(p_hidh_mouse->pipe_hdl, TUSB_EVENT_XFER_COMPLETE);
+  hidh_isr(p_hidh_mouse->pipe_hdl, TUSB_EVENT_XFER_COMPLETE, 8);
 
   tusbh_device_get_state_IgnoreAndReturn(TUSB_DEVICE_STATE_CONFIGURED);
   TEST_ASSERT_EQUAL(TUSB_INTERFACE_STATUS_COMPLETE, tusbh_hid_mouse_status(dev_addr));
@@ -216,7 +216,7 @@ void test_mouse_isr_event_xfer_error(void)
   tusbh_hid_mouse_isr_Expect(dev_addr, TUSB_EVENT_XFER_ERROR);
 
   //------------- Code Under TEST -------------//
-  hidh_isr(p_hidh_mouse->pipe_hdl, TUSB_EVENT_XFER_ERROR);
+  hidh_isr(p_hidh_mouse->pipe_hdl, TUSB_EVENT_XFER_ERROR, 0);
 
   tusbh_device_get_state_IgnoreAndReturn(TUSB_DEVICE_STATE_CONFIGURED);
   TEST_ASSERT_EQUAL(TUSB_INTERFACE_STATUS_ERROR, tusbh_hid_mouse_status(dev_addr));
diff --git a/tinyusb/class/cdc_host.c b/tinyusb/class/cdc_host.c
index d2830e41e..023c69a19 100644
--- a/tinyusb/class/cdc_host.c
+++ b/tinyusb/class/cdc_host.c
@@ -63,6 +63,16 @@ STATIC_ INLINE_ bool tusbh_cdc_is_mounted(uint8_t dev_addr)
   return (tusbh_device_get_mounted_class_flag(dev_addr) & BIT_(TUSB_CLASS_CDC)) != 0;
 }
 
+static inline cdc_pipeid_t get_app_pipeid(pipe_handle_t pipe_hdl) ATTR_PURE  ATTR_ALWAYS_INLINE;
+static inline cdc_pipeid_t get_app_pipeid(pipe_handle_t pipe_hdl)
+{
+  cdch_data_t const * p_cdc = cdch_data + (pipe_hdl.dev_addr-1);
+
+  return pipehandle_is_equal( pipe_hdl, p_cdc->pipe_notification ) ? CDC_PIPE_NOTIFICATION :
+         pipehandle_is_equal( pipe_hdl, p_cdc->pipe_in           ) ? CDC_PIPE_DATA_IN :
+         pipehandle_is_equal( pipe_hdl, p_cdc->pipe_out          ) ? CDC_PIPE_DATA_OUT : 0;
+}
+
 //--------------------------------------------------------------------+
 // APPLICATION API (parameter validation needed)
 //--------------------------------------------------------------------+
@@ -186,11 +196,11 @@ tusb_error_t cdch_open_subtask(uint8_t dev_addr, tusb_descriptor_interface_t con
   return TUSB_ERROR_NONE;
 }
 
-void cdch_isr(pipe_handle_t pipe_hdl, tusb_event_t event)
+void cdch_isr(pipe_handle_t pipe_hdl, tusb_event_t event, uint32_t xferred_bytes)
 {
-  if (tusbh_cdc_isr)
+  if (tusbh_cdc_xfer_isr)
   {
-    tusbh_cdc_isr(pipe_hdl.dev_addr, event);
+    tusbh_cdc_xfer_isr( pipe_hdl.dev_addr, event, get_app_pipeid(pipe_hdl), xferred_bytes );
   }
 }
 
diff --git a/tinyusb/class/cdc_host.h b/tinyusb/class/cdc_host.h
index 100042b50..fc21fcc25 100644
--- a/tinyusb/class/cdc_host.h
+++ b/tinyusb/class/cdc_host.h
@@ -72,7 +72,7 @@ tusb_error_t tusbh_cdc_receive(uint8_t dev_addr, void * p_buffer, uint32_t lengt
 void tusbh_cdc_mounted_isr(uint8_t dev_addr) ATTR_WEAK;
 void tusbh_cdc_unmounted_isr(uint8_t dev_addr) ATTR_WEAK;
 void tusbh_cdc_isr(uint8_t dev_addr, tusb_event_t event) ATTR_WEAK;
-void tusbh_cdc_xfer_isr(uint8_t dev_addr, tusb_event_t event) ATTR_WEAK;
+void tusbh_cdc_xfer_isr(uint8_t dev_addr, tusb_event_t event, cdc_pipeid_t pipe_id, uint32_t xferred_bytes) ATTR_WEAK;
 //--------------------------------------------------------------------+
 // USBH-CLASS API
 //--------------------------------------------------------------------+
@@ -91,7 +91,7 @@ extern cdch_data_t cdch_data[TUSB_CFG_HOST_DEVICE_MAX]; // TODO consider to move
 
 void         cdch_init(void);
 tusb_error_t cdch_open_subtask(uint8_t dev_addr, tusb_descriptor_interface_t const *p_interface_desc, uint16_t *p_length) ATTR_WARN_UNUSED_RESULT;
-void         cdch_isr(pipe_handle_t pipe_hdl, tusb_event_t event);
+void         cdch_isr(pipe_handle_t pipe_hdl, tusb_event_t event, uint32_t xferred_bytes);
 void         cdch_close(uint8_t dev_addr);
 
 #endif
diff --git a/tinyusb/class/hid_host.c b/tinyusb/class/hid_host.c
index 9328ba782..13949c0d4 100644
--- a/tinyusb/class/hid_host.c
+++ b/tinyusb/class/hid_host.c
@@ -288,7 +288,7 @@ tusb_error_t hidh_open_subtask(uint8_t dev_addr, tusb_descriptor_interface_t con
   OSAL_SUBTASK_END
 }
 
-void hidh_isr(pipe_handle_t pipe_hdl, tusb_event_t event)
+void hidh_isr(pipe_handle_t pipe_hdl, tusb_event_t event, uint32_t xferred_bytes)
 {
 #if TUSB_CFG_HOST_HID_KEYBOARD
   if ( pipehandle_is_equal(pipe_hdl, keyboard_data[pipe_hdl.dev_addr-1].pipe_hdl) )
diff --git a/tinyusb/class/hid_host.h b/tinyusb/class/hid_host.h
index e9337b5c1..510cbc950 100644
--- a/tinyusb/class/hid_host.h
+++ b/tinyusb/class/hid_host.h
@@ -99,7 +99,7 @@ typedef struct {
 
 void         hidh_init(void);
 tusb_error_t hidh_open_subtask(uint8_t dev_addr, tusb_descriptor_interface_t const *p_interface_desc, uint16_t *p_length) ATTR_WARN_UNUSED_RESULT;
-void         hidh_isr(pipe_handle_t pipe_hdl, tusb_event_t event);
+void         hidh_isr(pipe_handle_t pipe_hdl, tusb_event_t event, uint32_t xferred_bytes);
 void         hidh_close(uint8_t dev_addr);
 
 #endif
diff --git a/tinyusb/host/usbh.c b/tinyusb/host/usbh.c
index 794fd3be7..11c8ec302 100644
--- a/tinyusb/host/usbh.c
+++ b/tinyusb/host/usbh.c
@@ -245,7 +245,7 @@ void usbh_xfer_isr(pipe_handle_t pipe_hdl, uint8_t class_code, tusb_event_t even
     osal_semaphore_post( usbh_devices[ pipe_hdl.dev_addr ].control.sem_hdl );
   }else if (usbh_class_drivers[class_index].isr)
   {
-    usbh_class_drivers[class_index].isr(pipe_hdl, event);
+    usbh_class_drivers[class_index].isr(pipe_hdl, event, xferred_bytes);
   }else
   {
     ASSERT(false, (void) 0); // something wrong, no one claims the isr's source
diff --git a/tinyusb/host/usbh.h b/tinyusb/host/usbh.h
index 97eb4542b..31efcd536 100644
--- a/tinyusb/host/usbh.h
+++ b/tinyusb/host/usbh.h
@@ -76,7 +76,7 @@ typedef enum tusb_interface_status_{
 typedef struct {
   void (* const init) (void);
   tusb_error_t (* const open_subtask)(uint8_t, tusb_descriptor_interface_t const *, uint16_t*);
-  void (* const isr) (pipe_handle_t, tusb_event_t);
+  void (* const isr) (pipe_handle_t, tusb_event_t, uint32_t);
   void (* const close) (uint8_t);
 } host_class_driver_t;
 //--------------------------------------------------------------------+