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diff --git a/tinyusb/src/host/hcd.h b/tinyusb/src/host/hcd.h
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+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef _TUSB_HCD_H_
+#define _TUSB_HCD_H_
+
+#include "common/tusb_common.h"
+#include "osal/osal.h"
+#include "common/tusb_fifo.h"
+#include "hcd_attr.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+ //--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+typedef enum
+{
+  HCD_EVENT_DEVICE_ATTACH,
+  HCD_EVENT_DEVICE_REMOVE,
+  HCD_EVENT_XFER_COMPLETE,
+
+  // Not an HCD event, just a convenient way to defer ISR function
+  USBH_EVENT_FUNC_CALL,
+
+  HCD_EVENT_COUNT
+} hcd_eventid_t;
+
+typedef struct
+{
+  uint8_t rhport;
+  uint8_t event_id;
+  uint8_t dev_addr;
+
+  union
+  {
+    // Attach, Remove
+    struct {
+      uint8_t hub_addr;
+      uint8_t hub_port;
+      uint8_t speed;
+    } connection;
+
+    // XFER_COMPLETE
+    struct {
+      uint8_t ep_addr;
+      uint8_t result;
+      uint32_t len;
+    } xfer_complete;
+
+    // FUNC_CALL
+    struct {
+      void (*func) (void*);
+      void* param;
+    }func_call;
+  };
+
+} hcd_event_t;
+
+#if TUSB_OPT_HOST_ENABLED
+// Max number of endpoints per device
+enum {
+  // TODO better computation
+  HCD_MAX_ENDPOINT = CFG_TUH_DEVICE_MAX*(CFG_TUH_HUB + CFG_TUH_HID*2 + CFG_TUH_MSC*2 + CFG_TUH_CDC*3),
+  HCD_MAX_XFER     = HCD_MAX_ENDPOINT*2,
+};
+
+//#define HCD_MAX_ENDPOINT 16
+//#define HCD_MAX_XFER 16
+
+typedef struct {
+  uint8_t rhport;
+  uint8_t hub_addr;
+  uint8_t hub_port;
+  uint8_t speed;
+} hcd_devtree_info_t;
+
+#endif
+
+//--------------------------------------------------------------------+
+// Controller API
+//--------------------------------------------------------------------+
+
+// Initialize controller to host mode
+bool hcd_init(uint8_t rhport);
+
+// Interrupt Handler
+void hcd_int_handler(uint8_t rhport);
+
+// Enable USB interrupt
+void hcd_int_enable (uint8_t rhport);
+
+// Disable USB interrupt
+void hcd_int_disable(uint8_t rhport);
+
+// Get frame number (1ms)
+uint32_t hcd_frame_number(uint8_t rhport);
+
+//--------------------------------------------------------------------+
+// Port API
+//--------------------------------------------------------------------+
+
+// Get the current connect status of roothub port
+bool hcd_port_connect_status(uint8_t rhport);
+
+// Reset USB bus on the port
+void hcd_port_reset(uint8_t rhport);
+
+// TODO implement later
+void hcd_port_reset_end(uint8_t rhport);
+
+// Get port link speed
+tusb_speed_t hcd_port_speed_get(uint8_t rhport);
+
+// HCD closes all opened endpoints belong to this device
+void hcd_device_close(uint8_t rhport, uint8_t dev_addr);
+
+//--------------------------------------------------------------------+
+// Endpoints API
+//--------------------------------------------------------------------+
+
+bool hcd_setup_send(uint8_t rhport, uint8_t dev_addr, uint8_t const setup_packet[8]);
+bool hcd_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const * ep_desc);
+bool hcd_edpt_xfer(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr, uint8_t * buffer, uint16_t buflen);
+bool hcd_edpt_clear_stall(uint8_t dev_addr, uint8_t ep_addr);
+
+//--------------------------------------------------------------------+
+// USBH implemented API
+//--------------------------------------------------------------------+
+
+// Get device tree information of a device
+// USB device tree can be complicated and manged by USBH, this help HCD to retrieve
+// needed topology info to carry out its work
+extern void hcd_devtree_get_info(uint8_t dev_addr, hcd_devtree_info_t* devtree_info);
+
+//------------- Event API -------------//
+
+// Called by HCD to notify stack
+extern void hcd_event_handler(hcd_event_t const* event, bool in_isr);
+
+// Helper to send device attach event
+extern void hcd_event_device_attach(uint8_t rhport, bool in_isr);
+
+// Helper to send device removal event
+extern void hcd_event_device_remove(uint8_t rhport, bool in_isr);
+
+// Helper to send USB transfer event
+extern void hcd_event_xfer_complete(uint8_t dev_addr, uint8_t ep_addr, uint32_t xferred_bytes, xfer_result_t result, bool in_isr);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_HCD_H_ */