diff --git a/tinyusb/class/custom_class.h b/tinyusb/class/custom_class.h
index 9a6588a26..1d226d489 100644
--- a/tinyusb/class/custom_class.h
+++ b/tinyusb/class/custom_class.h
@@ -61,6 +61,17 @@ typedef struct {
 //--------------------------------------------------------------------+
 // USBH-CLASS DRIVER API
 //--------------------------------------------------------------------+
+STATIC_ INLINE_ bool tusbh_custom_is_mounted(uint8_t dev_addr, uint16_t vendor_id, uint16_t product_id);
+STATIC_ INLINE_ bool tusbh_custom_is_mounted(uint8_t dev_addr, uint16_t vendor_id, uint16_t product_id)
+{
+  (void) vendor_id; // TODO check this later
+  (void) product_id;
+  return (tusbh_device_get_mounted_class_flag(dev_addr) & BIT_(TUSB_CLASS_MAPPED_INDEX_END-1) ) != 0;
+}
+
+tusb_error_t tusbh_custom_read(uint8_t dev_addr, uint16_t vendor_id, uint16_t product_id, void * p_buffer, uint16_t length);
+tusb_error_t tusbh_custom_write(uint8_t dev_addr, uint16_t vendor_id, uint16_t product_id, void const * p_data, uint16_t length);
+
 #ifdef _TINY_USB_SOURCE_FILE_
 
 void         cush_init(void);
diff --git a/tinyusb/class/custom_class_host.c b/tinyusb/class/custom_class_host.c
index 723cb06ff..568c20f3f 100644
--- a/tinyusb/class/custom_class_host.c
+++ b/tinyusb/class/custom_class_host.c
@@ -56,8 +56,35 @@
 // INTERNAL OBJECT & FUNCTION DECLARATION
 //--------------------------------------------------------------------+
 custom_interface_info_t custom_interface[TUSB_CFG_HOST_DEVICE_MAX];
+
 //--------------------------------------------------------------------+
-// IMPLEMENTATION
+// APPLICATION API
+//--------------------------------------------------------------------+
+tusb_error_t tusbh_custom_read(uint8_t dev_addr, uint16_t vendor_id, uint16_t product_id, void * p_buffer, uint16_t length)
+{
+  if ( !tusbh_custom_is_mounted(dev_addr, vendor_id, product_id) )
+  {
+    return TUSB_ERROR_DEVICE_NOT_READY;
+  }
+
+  ASSERT( p_buffer != NULL && length != 0, TUSB_ERROR_INVALID_PARA);
+  if ( hcd_pipe_is_idle(custom_interface[dev_addr-1].pipe_in) )
+  {
+    return TUSB_ERROR_INTERFACE_IS_BUSY;
+  }
+
+  (void) hcd_pipe_xfer( custom_interface[dev_addr-1].pipe_in, p_buffer, length, false);
+
+  return TUSB_ERROR_NONE;
+}
+
+tusb_error_t tusbh_custom_write(uint8_t dev_addr, uint16_t vendor_id, uint16_t product_id, void const * p_data, uint16_t length)
+{
+  return TUSB_ERROR_NONE;
+}
+
+//--------------------------------------------------------------------+
+// USBH-CLASS API
 //--------------------------------------------------------------------+
 void cush_init(void)
 {
diff --git a/tinyusb/class/hid_host.c b/tinyusb/class/hid_host.c
index 3546a512a..1caea01ee 100644
--- a/tinyusb/class/hid_host.c
+++ b/tinyusb/class/hid_host.c
@@ -95,11 +95,11 @@ tusb_error_t hidh_interface_get_report(uint8_t dev_addr, void * report, hidh_int
 tusb_error_t hidh_interface_get_report(uint8_t dev_addr, void * report, hidh_interface_info_t *p_hid)
 {
   //------------- parameters validation -------------//
+  // TODO change to use is configured function
   ASSERT_INT(TUSB_DEVICE_STATE_CONFIGURED, tusbh_device_get_state(dev_addr), TUSB_ERROR_DEVICE_NOT_READY);
   ASSERT_PTR(report, TUSB_ERROR_INVALID_PARA);
   ASSERT(TUSB_INTERFACE_STATUS_BUSY != p_hid->status, TUSB_ERROR_INTERFACE_IS_BUSY);
 
-  // TODO abstract to use hidh service
   ASSERT_STATUS( hcd_pipe_xfer(p_hid->pipe_hdl, report, p_hid->report_size, true) ) ;
 
   p_hid->status = TUSB_INTERFACE_STATUS_BUSY;
diff --git a/tinyusb/host/ehci/ehci.c b/tinyusb/host/ehci/ehci.c
index 4a030cbbe..b023fafed 100644
--- a/tinyusb/host/ehci/ehci.c
+++ b/tinyusb/host/ehci/ehci.c
@@ -444,6 +444,12 @@ tusb_error_t  hcd_pipe_close(pipe_handle_t pipe_hdl)
   return TUSB_ERROR_NONE;
 }
 
+bool hcd_pipe_is_idle(pipe_handle_t pipe_hdl)
+{
+  ehci_qhd_t *p_qhd = qhd_get_from_pipe_handle( pipe_hdl );
+  return (p_qhd->p_qtd_list_head == NULL);
+}
+
 //--------------------------------------------------------------------+
 // EHCI Interrupt Handler
 //--------------------------------------------------------------------+
diff --git a/tinyusb/host/hcd.h b/tinyusb/host/hcd.h
index fed45bf8a..33582dc61 100644
--- a/tinyusb/host/hcd.h
+++ b/tinyusb/host/hcd.h
@@ -96,6 +96,7 @@ tusb_error_t  hcd_pipe_control_close(uint8_t dev_addr) ATTR_WARN_UNUSED_RESULT;
 pipe_handle_t hcd_pipe_open(uint8_t dev_addr, tusb_descriptor_endpoint_t const * endpoint_desc, uint8_t class_code) ATTR_WARN_UNUSED_RESULT;
 tusb_error_t  hcd_pipe_xfer(pipe_handle_t pipe_hdl, uint8_t buffer[], uint16_t total_bytes, bool int_on_complete)  ATTR_WARN_UNUSED_RESULT;
 tusb_error_t  hcd_pipe_close(pipe_handle_t pipe_hdl) ATTR_WARN_UNUSED_RESULT;
+bool hcd_pipe_is_idle(pipe_handle_t pipe_hdl);
 
 #if 0
 tusb_error_t hcd_pipe_cancel()ATTR_WARN_UNUSED_RESULT;
diff --git a/tinyusb/host/usbh.c b/tinyusb/host/usbh.c
index 33e68b5ed..bbddfef8a 100644
--- a/tinyusb/host/usbh.c
+++ b/tinyusb/host/usbh.c
@@ -130,6 +130,11 @@ tusb_device_state_t tusbh_device_get_state (uint8_t const dev_addr)
   return usbh_devices[dev_addr].state;
 }
 
+uint32_t tusbh_device_get_mounted_class_flag(uint8_t dev_addr)
+{
+  return tusbh_device_is_configured(dev_addr) ? usbh_devices[dev_addr].flag_supported_class : 0;
+}
+
 //--------------------------------------------------------------------+
 // CLASS-USBD API (don't require to verify parameters)
 //--------------------------------------------------------------------+
diff --git a/tinyusb/host/usbh.h b/tinyusb/host/usbh.h
index 6dcf12066..5879e7321 100644
--- a/tinyusb/host/usbh.h
+++ b/tinyusb/host/usbh.h
@@ -86,13 +86,14 @@ typedef struct {
 //--------------------------------------------------------------------+
 // APPLICATION API
 //--------------------------------------------------------------------+
-tusb_error_t tusbh_configuration_set     (uint8_t dev_addr, uint8_t configure_number) ATTR_WARN_UNUSED_RESULT;
+//tusb_error_t tusbh_configuration_set     (uint8_t dev_addr, uint8_t configure_number) ATTR_WARN_UNUSED_RESULT;
 tusb_device_state_t tusbh_device_get_state (uint8_t dev_addr) ATTR_WARN_UNUSED_RESULT ATTR_PURE;
 static inline bool tusbh_device_is_configured(uint8_t dev_addr) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_PURE;
 static inline bool tusbh_device_is_configured(uint8_t dev_addr)
 {
   return tusbh_device_get_state(dev_addr) == TUSB_DEVICE_STATE_CONFIGURED;
 }
+uint32_t tusbh_device_get_mounted_class_flag(uint8_t dev_addr);
 
 //--------------------------------------------------------------------+
 // APPLICATION CALLBACK
@@ -106,6 +107,7 @@ void         tusbh_device_mount_failed_cb(tusb_error_t error, tusb_descriptor_de
 //--------------------------------------------------------------------+
 #ifdef _TINY_USB_SOURCE_FILE_
 
+
 OSAL_TASK_FUNCTION (usbh_enumeration_task) (void* p_task_para);
 tusb_error_t usbh_init(void);