diff --git a/src/host/hcd.h b/src/host/hcd.h
new file mode 100644
index 0000000..eb53d2e
--- /dev/null
+++ b/src/host/hcd.h
@@ -0,0 +1,179 @@
+/* 
+ * 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_ */
diff --git a/src/host/hcd_attr.h b/src/host/hcd_attr.h
new file mode 100644
index 0000000..06011c6
--- /dev/null
+++ b/src/host/hcd_attr.h
@@ -0,0 +1,105 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, 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_ATTR_H_
+#define TUSB_HCD_ATTR_H_
+
+#include "tusb_option.h"
+
+// Attribute includes
+// - ENDPOINT_MAX: max (logical) number of endpoint
+// - PORT_HIGHSPEED: mask to indicate which port support highspeed mode, bit0 for port0 and so on.
+
+//------------- NXP -------------//
+#if TU_CHECK_MCU(OPT_MCU_LPC175X_6X, OPT_MCU_LPC177X_8X, OPT_MCU_LPC40XX)
+  #define HCD_ATTR_OHCI
+
+#elif TU_CHECK_MCU(OPT_MCU_LPC18XX, OPT_MCU_LPC43XX)
+  #define HCD_ATTR_EHCI_TRANSDIMENSION
+
+#elif TU_CHECK_MCU(OPT_MCU_LPC54XXX)
+  // #define HCD_ATTR_EHCI_NXP_PTD
+
+#elif TU_CHECK_MCU(OPT_MCU_LPC55XX)
+  // #define HCD_ATTR_EHCI_NXP_PTD
+
+#elif TU_CHECK_MCU(OPT_MCU_MIMXRT10XX)
+  #define HCD_ATTR_EHCI_TRANSDIMENSION
+
+#elif TU_CHECK_MCU(OPT_MCU_MKL25ZXX)
+
+//------------- Microchip -------------//
+#elif TU_CHECK_MCU(OPT_MCU_SAMD21, OPT_MCU_SAMD51, OPT_MCU_SAME5X) || \
+      TU_CHECK_MCU(OPT_MCU_SAMD11, OPT_MCU_SAML21, OPT_MCU_SAML22)
+
+#elif TU_CHECK_MCU(OPT_MCU_SAMG)
+
+#elif TU_CHECK_MCU(OPT_MCU_SAMX7X)
+
+//------------- ST -------------//
+#elif TU_CHECK_MCU(OPT_MCU_STM32F0, OPT_MCU_STM32F1, OPT_MCU_STM32F3) || \
+      TU_CHECK_MCU(OPT_MCU_STM32L0, OPT_MCU_STM32L1, OPT_MCU_STM32L4)
+
+#elif TU_CHECK_MCU(OPT_MCU_STM32F2, OPT_MCU_STM32F3, OPT_MCU_STM32F4)
+
+#elif TU_CHECK_MCU(OPT_MCU_STM32F7)
+
+#elif TU_CHECK_MCU(OPT_MCU_STM32H7)
+
+//------------- Sony -------------//
+#elif TU_CHECK_MCU(OPT_MCU_CXD56)
+
+//------------- Nuvoton -------------//
+#elif TU_CHECK_MCU(OPT_MCU_NUC505)
+
+//------------- Espressif -------------//
+#elif TU_CHECK_MCU(OPT_MCU_ESP32S2, OPT_MCU_ESP32S3)
+
+//------------- Raspberry Pi -------------//
+#elif TU_CHECK_MCU(OPT_MCU_RP2040)
+
+//------------- Silabs -------------//
+#elif TU_CHECK_MCU(OPT_MCU_EFM32GG)
+
+//------------- Renesas -------------//
+#elif TU_CHECK_MCU(OPT_MCU_RX63X, OPT_MCU_RX65X, OPT_MCU_RX72N)
+
+//#elif TU_CHECK_MCU(OPT_MCU_MM32F327X)
+//  #define DCD_ATTR_ENDPOINT_MAX not known yet
+
+//------------- GigaDevice -------------//
+#elif TU_CHECK_MCU(OPT_MCU_GD32VF103)
+
+#else
+//  #warning "DCD_ATTR_ENDPOINT_MAX is not defined for this MCU, default to 8"
+#endif
+
+// Default to fullspeed if not defined
+//#ifndef PORT_HIGHSPEED
+//  #define DCD_ATTR_PORT_HIGHSPEED 0x00
+//#endif
+
+#endif
diff --git a/src/host/hub.c b/src/host/hub.c
new file mode 100644
index 0000000..fd4dbd0
--- /dev/null
+++ b/src/host/hub.c
@@ -0,0 +1,388 @@
+/* 
+ * 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.
+ */
+
+#include "tusb_option.h"
+
+#if (TUSB_OPT_HOST_ENABLED && CFG_TUH_HUB)
+
+#include "usbh.h"
+#include "usbh_classdriver.h"
+#include "hub.h"
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+typedef struct
+{
+  uint8_t itf_num;
+  uint8_t ep_in;
+  uint8_t port_count;
+  uint8_t status_change; // data from status change interrupt endpoint
+
+  hub_port_status_response_t port_status;
+} hub_interface_t;
+
+CFG_TUSB_MEM_SECTION static hub_interface_t hub_data[CFG_TUH_HUB];
+CFG_TUSB_MEM_SECTION TU_ATTR_ALIGNED(4) static uint8_t _hub_buffer[sizeof(descriptor_hub_desc_t)];
+
+TU_ATTR_ALWAYS_INLINE
+static inline hub_interface_t* get_itf(uint8_t dev_addr)
+{
+  return &hub_data[dev_addr-1-CFG_TUH_DEVICE_MAX];
+}
+
+#if CFG_TUSB_DEBUG
+static char const* const _hub_feature_str[] =
+{
+  [HUB_FEATURE_PORT_CONNECTION          ] = "PORT_CONNECTION",
+  [HUB_FEATURE_PORT_ENABLE              ] = "PORT_ENABLE",
+  [HUB_FEATURE_PORT_SUSPEND             ] = "PORT_SUSPEND",
+  [HUB_FEATURE_PORT_OVER_CURRENT        ] = "PORT_OVER_CURRENT",
+  [HUB_FEATURE_PORT_RESET               ] = "PORT_RESET",
+  [HUB_FEATURE_PORT_POWER               ] = "PORT_POWER",
+  [HUB_FEATURE_PORT_LOW_SPEED           ] = "PORT_LOW_SPEED",
+  [HUB_FEATURE_PORT_CONNECTION_CHANGE   ] = "PORT_CONNECTION_CHANGE",
+  [HUB_FEATURE_PORT_ENABLE_CHANGE       ] = "PORT_ENABLE_CHANGE",
+  [HUB_FEATURE_PORT_SUSPEND_CHANGE      ] = "PORT_SUSPEND_CHANGE",
+  [HUB_FEATURE_PORT_OVER_CURRENT_CHANGE ] = "PORT_OVER_CURRENT_CHANGE",
+  [HUB_FEATURE_PORT_RESET_CHANGE        ] = "PORT_RESET_CHANGE",
+  [HUB_FEATURE_PORT_TEST                ] = "PORT_TEST",
+  [HUB_FEATURE_PORT_INDICATOR           ] = "PORT_INDICATOR",
+};
+#endif
+
+//--------------------------------------------------------------------+
+// HUB
+//--------------------------------------------------------------------+
+bool hub_port_clear_feature(uint8_t hub_addr, uint8_t hub_port, uint8_t feature, tuh_control_complete_cb_t complete_cb)
+{
+  tusb_control_request_t const request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_OTHER,
+      .type      = TUSB_REQ_TYPE_CLASS,
+      .direction = TUSB_DIR_OUT
+    },
+    .bRequest = HUB_REQUEST_CLEAR_FEATURE,
+    .wValue   = feature,
+    .wIndex   = hub_port,
+    .wLength  = 0
+  };
+
+  TU_LOG2("HUB Clear Feature: %s, addr = %u port = %u\r\n", _hub_feature_str[feature], hub_addr, hub_port);
+  TU_ASSERT( tuh_control_xfer(hub_addr, &request, NULL, complete_cb) );
+  return true;
+}
+
+bool hub_port_set_feature(uint8_t hub_addr, uint8_t hub_port, uint8_t feature, tuh_control_complete_cb_t complete_cb)
+{
+  tusb_control_request_t const request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_OTHER,
+      .type      = TUSB_REQ_TYPE_CLASS,
+      .direction = TUSB_DIR_OUT
+    },
+    .bRequest = HUB_REQUEST_SET_FEATURE,
+    .wValue   = feature,
+    .wIndex   = hub_port,
+    .wLength  = 0
+  };
+
+  TU_LOG2("HUB Set Feature: %s, addr = %u port = %u\r\n", _hub_feature_str[feature], hub_addr, hub_port);
+  TU_ASSERT( tuh_control_xfer(hub_addr, &request, NULL, complete_cb) );
+  return true;
+}
+
+bool hub_port_reset(uint8_t hub_addr, uint8_t hub_port, tuh_control_complete_cb_t complete_cb)
+{
+  return hub_port_set_feature(hub_addr, hub_port, HUB_FEATURE_PORT_RESET, complete_cb);
+}
+
+bool hub_port_get_status(uint8_t hub_addr, uint8_t hub_port, void* resp, tuh_control_complete_cb_t complete_cb)
+{
+  tusb_control_request_t const request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_OTHER,
+      .type      = TUSB_REQ_TYPE_CLASS,
+      .direction = TUSB_DIR_IN
+    },
+    .bRequest = HUB_REQUEST_GET_STATUS,
+    .wValue   = 0,
+    .wIndex   = hub_port,
+    .wLength  = 4
+  };
+
+  TU_LOG2("HUB Get Port Status: addr = %u port = %u\r\n", hub_addr, hub_port);
+  TU_ASSERT( tuh_control_xfer( hub_addr, &request, resp, complete_cb) );
+  return true;
+}
+
+//--------------------------------------------------------------------+
+// CLASS-USBH API (don't require to verify parameters)
+//--------------------------------------------------------------------+
+void hub_init(void)
+{
+  tu_memclr(hub_data, sizeof(hub_data));
+}
+
+bool hub_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *itf_desc, uint16_t max_len)
+{
+  TU_VERIFY(TUSB_CLASS_HUB == itf_desc->bInterfaceClass &&
+            0              == itf_desc->bInterfaceSubClass);
+
+  // hub driver does not support multiple TT yet
+  TU_VERIFY(itf_desc->bInterfaceProtocol <= 1);
+
+  // msc driver length is fixed
+  uint16_t const drv_len = sizeof(tusb_desc_interface_t) + sizeof(tusb_desc_endpoint_t);
+  TU_ASSERT(drv_len <= max_len);
+
+  //------------- Interrupt Status endpoint -------------//
+  tusb_desc_endpoint_t const *desc_ep = (tusb_desc_endpoint_t const *) tu_desc_next(itf_desc);
+
+  TU_ASSERT(TUSB_DESC_ENDPOINT  == desc_ep->bDescriptorType &&
+            TUSB_XFER_INTERRUPT == desc_ep->bmAttributes.xfer, 0);
+  
+  TU_ASSERT(usbh_edpt_open(rhport, dev_addr, desc_ep));
+
+  hub_interface_t* p_hub = get_itf(dev_addr);
+
+  p_hub->itf_num = itf_desc->bInterfaceNumber;
+  p_hub->ep_in   = desc_ep->bEndpointAddress;
+
+  return true;
+}
+
+void hub_close(uint8_t dev_addr)
+{
+  TU_VERIFY(dev_addr > CFG_TUH_DEVICE_MAX, );
+  hub_interface_t* p_hub = get_itf(dev_addr);
+
+  if (p_hub->ep_in) tu_memclr(p_hub, sizeof( hub_interface_t));
+}
+
+bool hub_status_pipe_queue(uint8_t dev_addr)
+{
+  hub_interface_t* hub_itf = get_itf(dev_addr);
+  return usbh_edpt_xfer(dev_addr, hub_itf->ep_in, &hub_itf->status_change, 1);
+}
+
+
+//--------------------------------------------------------------------+
+// Set Configure
+//--------------------------------------------------------------------+
+
+static bool config_set_port_power (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool config_port_power_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+
+bool hub_set_config(uint8_t dev_addr, uint8_t itf_num)
+{
+  hub_interface_t* p_hub = get_itf(dev_addr);
+  TU_ASSERT(itf_num == p_hub->itf_num);
+
+  // Get Hub Descriptor
+  tusb_control_request_t const request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_CLASS,
+      .direction = TUSB_DIR_IN
+    },
+    .bRequest = HUB_REQUEST_GET_DESCRIPTOR,
+    .wValue   = 0,
+    .wIndex   = 0,
+    .wLength  = sizeof(descriptor_hub_desc_t)
+  };
+
+  TU_ASSERT( tuh_control_xfer(dev_addr, &request, _hub_buffer, config_set_port_power) );
+
+  return true;
+}
+
+static bool config_set_port_power (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  hub_interface_t* p_hub = get_itf(dev_addr);
+
+  // only use number of ports in hub descriptor
+  descriptor_hub_desc_t const* desc_hub = (descriptor_hub_desc_t const*) _hub_buffer;
+  p_hub->port_count = desc_hub->bNbrPorts;
+
+  // May need to GET_STATUS
+
+  // Set Port Power to be able to detect connection, starting with port 1
+  uint8_t const hub_port = 1;
+  return hub_port_set_feature(dev_addr, hub_port, HUB_FEATURE_PORT_POWER, config_port_power_complete);
+}
+
+static bool config_port_power_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+   hub_interface_t* p_hub = get_itf(dev_addr);
+
+  if (request->wIndex == p_hub->port_count)
+  {
+    // All ports are power -> queue notification status endpoint and
+    // complete the SET CONFIGURATION
+    TU_ASSERT( usbh_edpt_xfer(dev_addr, p_hub->ep_in, &p_hub->status_change, 1) );
+
+    usbh_driver_set_config_complete(dev_addr, p_hub->itf_num);
+  }else
+  {
+    // power next port
+    uint8_t const hub_port = (uint8_t) (request->wIndex + 1);
+    return hub_port_set_feature(dev_addr, hub_port, HUB_FEATURE_PORT_POWER, config_port_power_complete);
+  }
+
+  return true;
+}
+
+//--------------------------------------------------------------------+
+// Connection Changes
+//--------------------------------------------------------------------+
+
+static bool connection_get_status_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool connection_clear_conn_change_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool connection_port_reset_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+
+// callback as response of interrupt endpoint polling
+bool hub_xfer_cb(uint8_t dev_addr, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes)
+{
+  (void) xferred_bytes; // TODO can be more than 1 for hub with lots of ports
+  (void) ep_addr;
+  TU_ASSERT(result == XFER_RESULT_SUCCESS);
+
+  hub_interface_t* p_hub = get_itf(dev_addr);
+
+  TU_LOG2("  Port Status Change = 0x%02X\r\n", p_hub->status_change);
+
+  // Hub ignore bit0 in status change
+  for (uint8_t port=1; port <= p_hub->port_count; port++)
+  {
+    if ( tu_bit_test(p_hub->status_change, port) )
+    {
+      hub_port_get_status(dev_addr, port, &p_hub->port_status, connection_get_status_complete);
+      break;
+    }
+  }
+
+  // NOTE: next status transfer is queued by usbh.c after handling this request
+
+  return true;
+}
+
+static bool connection_get_status_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  TU_ASSERT(result == XFER_RESULT_SUCCESS);
+
+  hub_interface_t* p_hub = get_itf(dev_addr);
+  uint8_t const port_num = (uint8_t) request->wIndex;
+
+  // Connection change
+  if (p_hub->port_status.change.connection)
+  {
+    // Port is powered and enabled
+    //TU_VERIFY(port_status.status_current.port_power && port_status.status_current.port_enable, );
+
+    // Acknowledge Port Connection Change
+    hub_port_clear_feature(dev_addr, port_num, HUB_FEATURE_PORT_CONNECTION_CHANGE, connection_clear_conn_change_complete);
+  }else
+  {
+    // Other changes are: Enable, Suspend, Over Current, Reset, L1 state
+    // TODO clear change
+
+    // prepare for next hub status
+    // TODO continue with status_change, or maybe we can do it again with status
+    hub_status_pipe_queue(dev_addr);
+  }
+
+  return true;
+}
+
+static bool connection_clear_conn_change_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  TU_ASSERT(result == XFER_RESULT_SUCCESS);
+
+  hub_interface_t* p_hub = get_itf(dev_addr);
+  uint8_t const port_num = (uint8_t) request->wIndex;
+
+  if ( p_hub->port_status.status.connection )
+  {
+    // Reset port if attach event
+    hub_port_reset(dev_addr, port_num, connection_port_reset_complete);
+  }else
+  {
+    // submit detach event
+    hcd_event_t event =
+    {
+      .rhport     = usbh_get_rhport(dev_addr),
+      .event_id   = HCD_EVENT_DEVICE_REMOVE,
+      .connection =
+       {
+         .hub_addr = dev_addr,
+         .hub_port = port_num
+       }
+    };
+
+    hcd_event_handler(&event, false);
+  }
+
+  return true;
+}
+
+static bool connection_port_reset_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  TU_ASSERT(result == XFER_RESULT_SUCCESS);
+
+  // hub_interface_t* p_hub = get_itf(dev_addr);
+  uint8_t const port_num = (uint8_t) request->wIndex;
+
+  // submit attach event
+  hcd_event_t event =
+  {
+    .rhport     = usbh_get_rhport(dev_addr),
+    .event_id   = HCD_EVENT_DEVICE_ATTACH,
+    .connection =
+    {
+      .hub_addr = dev_addr,
+      .hub_port = port_num
+    }
+  };
+
+  hcd_event_handler(&event, false);
+
+  return true;
+}
+
+#endif
diff --git a/src/host/hub.h b/src/host/hub.h
new file mode 100644
index 0000000..c4d5441
--- /dev/null
+++ b/src/host/hub.h
@@ -0,0 +1,196 @@
+/*
+ * 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.
+ */
+
+/** \ingroup group_class
+ *  \defgroup ClassDriver_Hub Hub (Host only)
+ *  \details  Like most PC's OS, Hub support is completely hidden from Application. In fact, application cannot determine whether
+ *            a device is mounted directly via roothub or via a hub's port. All Hub-related procedures are performed and managed
+ *            by tinyusb stack. Unless you are trying to develop the stack itself, there are nothing else can be used by Application.
+ *  \note     Due to my laziness, only 1-level of Hub is supported. In other way, the stack cannot mount a hub via another hub.
+ *  @{
+ */
+
+#ifndef _TUSB_HUB_H_
+#define _TUSB_HUB_H_
+
+#include "common/tusb_common.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//D1...D0: Logical Power Switching Mode
+//00:  Ganged power switching (all ports’power at
+//once)
+//01:  Individual port power switching
+//1X:  Reserved. Used only on 1.0 compliant hubs
+//that implement no power switching
+//D2:  Identifies a Compound Device
+//0: Hub is not part of a compound device.
+//1: Hub is part of a compound device.
+//D4...D3: Over-current Protection Mode
+//00: Global Over-current Protection. The hub
+//reports over-current as a summation of all
+//ports’current draw, without a breakdown of
+//individual port over-current status.
+//01: Individual Port Over-current Protection. The
+//hub reports over-current on a per-port basis.
+//Each port has an over-current status.
+//1X: No Over-current Protection. This option is
+//allowed only for bus-powered hubs that do not
+//implement over-current protection.
+//
+//D6...D5: TT Think TIme
+//00:  TT requires at most 8 FS bit times of inter
+//transaction gap on a full-/low-speed
+//downstream bus.
+//01:  TT requires at most 16 FS bit times.
+//10:  TT requires at most 24 FS bit times.
+//11:  TT requires at most 32 FS bit times.
+//D7: Port Indicators Supported
+//0:  Port Indicators are not supported on its
+//downstream facing ports and the
+//PORT_INDICATOR request has no effect.
+//1:  Port Indicators are supported on its
+//downstream facing ports and the
+//PORT_INDICATOR request controls the
+//indicators. See Section 11.5.3.
+//D15...D8: Reserved
+
+typedef struct TU_ATTR_PACKED{
+  uint8_t  bLength           ; ///< Size of descriptor
+  uint8_t  bDescriptorType   ; ///< Other_speed_Configuration Type
+  uint8_t  bNbrPorts;
+  uint16_t wHubCharacteristics;
+  uint8_t  bPwrOn2PwrGood;
+  uint8_t  bHubContrCurrent;
+  uint8_t  DeviceRemovable; // bitmap each bit for a port (from bit1)
+  uint8_t  PortPwrCtrlMask; // just for compatibility, should be 0xff
+} descriptor_hub_desc_t;
+
+TU_VERIFY_STATIC( sizeof(descriptor_hub_desc_t) == 9, "size is not correct");
+
+enum {
+  HUB_REQUEST_GET_STATUS      = 0  ,
+  HUB_REQUEST_CLEAR_FEATURE   = 1  ,
+
+  HUB_REQUEST_SET_FEATURE     = 3  ,
+
+  HUB_REQUEST_GET_DESCRIPTOR  = 6  ,
+  HUB_REQUEST_SET_DESCRIPTOR  = 7  ,
+  HUB_REQUEST_CLEAR_TT_BUFFER = 8  ,
+  HUB_REQUEST_RESET_TT        = 9  ,
+  HUB_REQUEST_GET_TT_STATE    = 10 ,
+  HUB_REQUEST_STOP_TT         = 11
+};
+
+enum {
+  HUB_FEATURE_HUB_LOCAL_POWER_CHANGE = 0,
+  HUB_FEATURE_HUB_OVER_CURRENT_CHANGE
+};
+
+enum{
+  HUB_FEATURE_PORT_CONNECTION          = 0,
+  HUB_FEATURE_PORT_ENABLE              = 1,
+  HUB_FEATURE_PORT_SUSPEND             = 2,
+  HUB_FEATURE_PORT_OVER_CURRENT        = 3,
+  HUB_FEATURE_PORT_RESET               = 4,
+
+  HUB_FEATURE_PORT_POWER               = 8,
+  HUB_FEATURE_PORT_LOW_SPEED           = 9,
+
+  HUB_FEATURE_PORT_CONNECTION_CHANGE   = 16,
+  HUB_FEATURE_PORT_ENABLE_CHANGE       = 17,
+  HUB_FEATURE_PORT_SUSPEND_CHANGE      = 18,
+  HUB_FEATURE_PORT_OVER_CURRENT_CHANGE = 19,
+  HUB_FEATURE_PORT_RESET_CHANGE        = 20,
+  HUB_FEATURE_PORT_TEST                = 21,
+  HUB_FEATURE_PORT_INDICATOR           = 22
+};
+
+// data in response of HUB_REQUEST_GET_STATUS, wIndex = 0 (hub)
+typedef struct {
+  union{
+    struct TU_ATTR_PACKED {
+      uint16_t local_power_source : 1;
+      uint16_t over_current       : 1;
+      uint16_t : 14;
+    };
+
+    uint16_t value;
+  } status, change;
+} hub_status_response_t;
+
+TU_VERIFY_STATIC( sizeof(hub_status_response_t) == 4, "size is not correct");
+
+// data in response of HUB_REQUEST_GET_STATUS, wIndex = Port num
+typedef struct {
+  union {
+    struct TU_ATTR_PACKED {
+      uint16_t connection             : 1;
+      uint16_t port_enable            : 1;
+      uint16_t suspend                : 1;
+      uint16_t over_current           : 1;
+      uint16_t reset                  : 1;
+
+      uint16_t                        : 3;
+      uint16_t port_power             : 1;
+      uint16_t low_speed              : 1;
+      uint16_t high_speed             : 1;
+      uint16_t port_test_mode         : 1;
+      uint16_t port_indicator_control : 1;
+      uint16_t TU_RESERVED            : 3;
+    };
+
+    uint16_t value;
+  } status, change;
+} hub_port_status_response_t;
+
+TU_VERIFY_STATIC( sizeof(hub_port_status_response_t) == 4, "size is not correct");
+
+bool hub_port_clear_feature(uint8_t hub_addr, uint8_t hub_port, uint8_t feature, tuh_control_complete_cb_t complete_cb);
+bool hub_port_set_feature(uint8_t hub_addr, uint8_t hub_port, uint8_t feature, tuh_control_complete_cb_t complete_cb);
+
+bool hub_port_reset(uint8_t hub_addr, uint8_t hub_port, tuh_control_complete_cb_t complete_cb);
+bool hub_port_get_status(uint8_t hub_addr, uint8_t hub_port, void* resp, tuh_control_complete_cb_t complete_cb);
+bool hub_status_pipe_queue(uint8_t dev_addr);
+
+//--------------------------------------------------------------------+
+// Internal Class Driver API
+//--------------------------------------------------------------------+
+void hub_init       (void);
+bool hub_open       (uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *itf_desc, uint16_t max_len);
+bool hub_set_config (uint8_t dev_addr, uint8_t itf_num);
+bool hub_xfer_cb    (uint8_t dev_addr, uint8_t ep_addr, xfer_result_t event, uint32_t xferred_bytes);
+void hub_close      (uint8_t dev_addr);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_HUB_H_ */
+
+/** @} */
diff --git a/src/host/usbh.c b/src/host/usbh.c
new file mode 100644
index 0000000..b8439ad
--- /dev/null
+++ b/src/host/usbh.c
@@ -0,0 +1,1204 @@
+/* 
+ * 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.
+ */
+
+#include "tusb_option.h"
+
+#if TUSB_OPT_HOST_ENABLED
+
+#include "tusb.h"
+#include "host/usbh.h"
+#include "host/usbh_classdriver.h"
+#include "hub.h"
+
+//--------------------------------------------------------------------+
+// USBH Configuration
+//--------------------------------------------------------------------+
+
+// TODO remove,update
+#ifndef CFG_TUH_EP_MAX
+#define CFG_TUH_EP_MAX          9
+#endif
+
+#ifndef CFG_TUH_TASK_QUEUE_SZ
+#define CFG_TUH_TASK_QUEUE_SZ   16
+#endif
+
+// Debug level of USBD
+#define USBH_DBG_LVL   2
+
+//--------------------------------------------------------------------+
+// USBH-HCD common data structure
+//--------------------------------------------------------------------+
+
+// device0 struct must be strictly a subset of normal device struct
+typedef struct
+{
+  // port
+  uint8_t rhport;
+  uint8_t hub_addr;
+  uint8_t hub_port;
+  uint8_t speed;
+
+  volatile struct TU_ATTR_PACKED
+  {
+    uint8_t connected    : 1;
+    uint8_t addressed    : 1;
+    uint8_t configured   : 1;
+    uint8_t suspended    : 1;
+  };
+} usbh_dev0_t;
+
+typedef struct {
+  // port
+  uint8_t rhport;
+  uint8_t hub_addr;
+  uint8_t hub_port;
+  uint8_t speed;
+
+  volatile struct TU_ATTR_PACKED
+  {
+    uint8_t connected    : 1;
+    uint8_t addressed    : 1;
+    uint8_t configured   : 1;
+    uint8_t suspended    : 1;
+  };
+
+  //------------- device descriptor -------------//
+  uint16_t vid;
+  uint16_t pid;
+
+  uint8_t  ep0_size;
+  uint8_t  i_manufacturer;
+  uint8_t  i_product;
+  uint8_t  i_serial;
+
+  //------------- configuration descriptor -------------//
+  // uint8_t interface_count; // bNumInterfaces alias
+
+  //------------- device -------------//
+  volatile uint8_t state;            // device state, value from enum tusbh_device_state_t
+
+  uint8_t itf2drv[16];               // map interface number to driver (0xff is invalid)
+  uint8_t ep2drv[CFG_TUH_EP_MAX][2]; // map endpoint to driver ( 0xff is invalid )
+
+  struct TU_ATTR_PACKED
+  {
+    volatile bool busy    : 1;
+    volatile bool stalled : 1;
+    volatile bool claimed : 1;
+
+    // TODO merge ep2drv here, 4-bit should be sufficient
+  }ep_status[CFG_TUH_EP_MAX][2];
+
+  // Mutex for claiming endpoint, only needed when using with preempted RTOS
+#if CFG_TUSB_OS != OPT_OS_NONE
+  osal_mutex_def_t mutexdef;
+  osal_mutex_t mutex;
+#endif
+
+} usbh_device_t;
+
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+
+// Invalid driver ID in itf2drv[] ep2drv[][] mapping
+enum { DRVID_INVALID = 0xFFu };
+enum { ADDR_INVALID  = 0xFFu };
+
+#if CFG_TUSB_DEBUG >= 2
+  #define DRIVER_NAME(_name)    .name = _name,
+#else
+  #define DRIVER_NAME(_name)
+#endif
+
+static usbh_class_driver_t const usbh_class_drivers[] =
+{
+  #if CFG_TUH_CDC
+    {
+      DRIVER_NAME("CDC")
+      .init       = cdch_init,
+      .open       = cdch_open,
+      .set_config = cdch_set_config,
+      .xfer_cb    = cdch_xfer_cb,
+      .close      = cdch_close
+    },
+  #endif
+
+  #if CFG_TUH_MSC
+    {
+      DRIVER_NAME("MSC")
+      .init       = msch_init,
+      .open       = msch_open,
+      .set_config = msch_set_config,
+      .xfer_cb    = msch_xfer_cb,
+      .close      = msch_close
+    },
+  #endif
+
+  #if CFG_TUH_HID
+    {
+      DRIVER_NAME("HID")
+      .init       = hidh_init,
+      .open       = hidh_open,
+      .set_config = hidh_set_config,
+      .xfer_cb    = hidh_xfer_cb,
+      .close      = hidh_close
+    },
+  #endif
+
+  #if CFG_TUH_HUB
+    {
+      DRIVER_NAME("HUB")
+      .init       = hub_init,
+      .open       = hub_open,
+      .set_config = hub_set_config,
+      .xfer_cb    = hub_xfer_cb,
+      .close      = hub_close
+    },
+  #endif
+
+  #if CFG_TUH_VENDOR
+    {
+      DRIVER_NAME("VENDOR")
+      .init       = cush_init,
+      .open       = cush_open_subtask,
+      .xfer_cb    = cush_isr,
+      .close      = cush_close
+    }
+  #endif
+};
+
+enum { USBH_CLASS_DRIVER_COUNT = TU_ARRAY_SIZE(usbh_class_drivers) };
+
+enum { RESET_DELAY = 500 };  // 200 USB specs say only 50ms but many devices require much longer
+
+enum { CONFIG_NUM = 1 }; // default to use configuration 1
+
+
+//--------------------------------------------------------------------+
+// INTERNAL OBJECT & FUNCTION DECLARATION
+//--------------------------------------------------------------------+
+
+static bool _usbh_initialized = false;
+
+// Device with address = 0 for enumeration
+static usbh_dev0_t _dev0;
+
+// all devices excluding zero-address
+// hub address start from CFG_TUH_DEVICE_MAX+1
+CFG_TUSB_MEM_SECTION usbh_device_t _usbh_devices[CFG_TUH_DEVICE_MAX + CFG_TUH_HUB];
+
+// Event queue
+// role device/host is used by OS NONE for mutex (disable usb isr)
+OSAL_QUEUE_DEF(OPT_MODE_HOST, _usbh_qdef, CFG_TUH_TASK_QUEUE_SZ, hcd_event_t);
+static osal_queue_t _usbh_q;
+
+CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN static uint8_t _usbh_ctrl_buf[CFG_TUH_ENUMERATION_BUFSIZE];
+
+//------------- Helper Function -------------//
+
+TU_ATTR_ALWAYS_INLINE
+static inline usbh_device_t* get_device(uint8_t dev_addr)
+{
+  TU_ASSERT(dev_addr, NULL);
+  return &_usbh_devices[dev_addr-1];
+}
+
+static bool enum_new_device(hcd_event_t* event);
+static void process_device_unplugged(uint8_t rhport, uint8_t hub_addr, uint8_t hub_port);
+static bool usbh_edpt_control_open(uint8_t dev_addr, uint8_t max_packet_size);
+
+// from usbh_control.c
+extern bool usbh_control_xfer_cb (uint8_t dev_addr, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes);
+
+//--------------------------------------------------------------------+
+// PUBLIC API (Parameter Verification is required)
+//--------------------------------------------------------------------+
+bool tuh_mounted(uint8_t dev_addr)
+{
+  return get_device(dev_addr)->configured;
+}
+
+bool tuh_vid_pid_get(uint8_t dev_addr, uint16_t* vid, uint16_t* pid)
+{
+  *vid = *pid = 0;
+
+  TU_VERIFY(tuh_mounted(dev_addr));
+
+  usbh_device_t const* dev = get_device(dev_addr);
+
+  *vid = dev->vid;
+  *pid = dev->pid;
+
+  return true;
+}
+
+tusb_speed_t tuh_speed_get (uint8_t dev_addr)
+{
+  return (tusb_speed_t) (dev_addr ? get_device(dev_addr)->speed : _dev0.speed);
+}
+
+#if CFG_TUSB_OS == OPT_OS_NONE
+void osal_task_delay(uint32_t msec)
+{
+  (void) msec;
+
+  const uint32_t start = hcd_frame_number(TUH_OPT_RHPORT);
+  while ( ( hcd_frame_number(TUH_OPT_RHPORT) - start ) < msec ) {}
+}
+#endif
+
+//--------------------------------------------------------------------+
+// CLASS-USBD API (don't require to verify parameters)
+//--------------------------------------------------------------------+
+
+bool tuh_inited(void)
+{
+  return _usbh_initialized;
+}
+
+bool tuh_init(uint8_t rhport)
+{
+  // skip if already initialized
+  if (_usbh_initialized) return _usbh_initialized;
+
+  TU_LOG2("USBH init\r\n");
+
+  tu_memclr(_usbh_devices, sizeof(_usbh_devices));
+  tu_memclr(&_dev0, sizeof(_dev0));
+
+  //------------- Enumeration & Reporter Task init -------------//
+  _usbh_q = osal_queue_create( &_usbh_qdef );
+  TU_ASSERT(_usbh_q != NULL);
+
+  //------------- Semaphore, Mutex for Control Pipe -------------//
+  for(uint8_t i=0; i<TU_ARRAY_SIZE(_usbh_devices); i++)
+  {
+    usbh_device_t * dev = &_usbh_devices[i];
+
+#if CFG_TUSB_OS != OPT_OS_NONE
+    dev->mutex = osal_mutex_create(&dev->mutexdef);
+    TU_ASSERT(dev->mutex);
+#endif
+
+    memset(dev->itf2drv, DRVID_INVALID, sizeof(dev->itf2drv)); // invalid mapping
+    memset(dev->ep2drv , DRVID_INVALID, sizeof(dev->ep2drv )); // invalid mapping
+  }
+
+  // Class drivers init
+  for (uint8_t drv_id = 0; drv_id < USBH_CLASS_DRIVER_COUNT; drv_id++)
+  {
+    TU_LOG2("%s init\r\n", usbh_class_drivers[drv_id].name);
+    usbh_class_drivers[drv_id].init();
+  }
+
+  TU_ASSERT(hcd_init(rhport));
+  hcd_int_enable(rhport);
+
+  _usbh_initialized = true;
+  return true;
+}
+
+/* USB Host Driver task
+ * This top level thread manages all host controller event and delegates events to class-specific drivers.
+ * This should be called periodically within the mainloop or rtos thread.
+ *
+   @code
+    int main(void)
+    {
+      application_init();
+      tusb_init();
+
+      while(1) // the mainloop
+      {
+        application_code();
+        tuh_task(); // tinyusb host task
+      }
+    }
+    @endcode
+ */
+void tuh_task(void)
+{
+  // Skip if stack is not initialized
+  if ( !tusb_inited() ) return;
+
+  // Loop until there is no more events in the queue
+  while (1)
+  {
+    hcd_event_t event;
+    if ( !osal_queue_receive(_usbh_q, &event) ) return;
+
+    switch (event.event_id)
+    {
+      case HCD_EVENT_DEVICE_ATTACH:
+        // TODO due to the shared _usbh_ctrl_buf, we must complete enumerating
+        // one device before enumerating another one.
+        TU_LOG2("USBH DEVICE ATTACH\r\n");
+        enum_new_device(&event);
+      break;
+
+      case HCD_EVENT_DEVICE_REMOVE:
+        TU_LOG2("USBH DEVICE REMOVED\r\n");
+        process_device_unplugged(event.rhport, event.connection.hub_addr, event.connection.hub_port);
+
+        #if CFG_TUH_HUB
+        // TODO remove
+        if ( event.connection.hub_addr != 0)
+        {
+          // done with hub, waiting for next data on status pipe
+          (void) hub_status_pipe_queue( event.connection.hub_addr );
+        }
+        #endif
+      break;
+
+      case HCD_EVENT_XFER_COMPLETE:
+      {
+        uint8_t const ep_addr = event.xfer_complete.ep_addr;
+        uint8_t const epnum   = tu_edpt_number(ep_addr);
+        uint8_t const ep_dir  = tu_edpt_dir(ep_addr);
+
+        TU_LOG2("on EP %02X with %u bytes\r\n", ep_addr, (unsigned int) event.xfer_complete.len);
+
+        if (event.dev_addr == 0)
+        {
+          // device 0 only has control endpoint
+          TU_ASSERT(epnum == 0, );
+          usbh_control_xfer_cb(event.dev_addr, ep_addr, event.xfer_complete.result, event.xfer_complete.len);
+        }
+        else
+        {
+          usbh_device_t* dev = get_device(event.dev_addr);
+          dev->ep_status[epnum][ep_dir].busy = false;
+          dev->ep_status[epnum][ep_dir].claimed = 0;
+
+          if ( 0 == epnum )
+          {
+            usbh_control_xfer_cb(event.dev_addr, ep_addr, event.xfer_complete.result, event.xfer_complete.len);
+          }else
+          {
+            uint8_t drv_id = dev->ep2drv[epnum][ep_dir];
+            TU_ASSERT(drv_id < USBH_CLASS_DRIVER_COUNT, );
+
+            TU_LOG2("%s xfer callback\r\n", usbh_class_drivers[drv_id].name);
+            usbh_class_drivers[drv_id].xfer_cb(event.dev_addr, ep_addr, event.xfer_complete.result, event.xfer_complete.len);
+          }
+        }
+      }
+      break;
+
+      case USBH_EVENT_FUNC_CALL:
+        if ( event.func_call.func ) event.func_call.func(event.func_call.param);
+      break;
+
+      default: break;
+    }
+  }
+}
+
+//--------------------------------------------------------------------+
+// USBH API For Class Driver
+//--------------------------------------------------------------------+
+
+uint8_t usbh_get_rhport(uint8_t dev_addr)
+{
+  return (dev_addr == 0) ? _dev0.rhport : get_device(dev_addr)->rhport;
+}
+
+uint8_t* usbh_get_enum_buf(void)
+{
+  return _usbh_ctrl_buf;
+}
+
+//--------------------------------------------------------------------+
+// HCD Event Handler
+//--------------------------------------------------------------------+
+
+void hcd_devtree_get_info(uint8_t dev_addr, hcd_devtree_info_t* devtree_info)
+{
+  if (dev_addr)
+  {
+    usbh_device_t const* dev = get_device(dev_addr);
+
+    devtree_info->rhport   = dev->rhport;
+    devtree_info->hub_addr = dev->hub_addr;
+    devtree_info->hub_port = dev->hub_port;
+    devtree_info->speed    = dev->speed;
+  }else
+  {
+    devtree_info->rhport   = _dev0.rhport;
+    devtree_info->hub_addr = _dev0.hub_addr;
+    devtree_info->hub_port = _dev0.hub_port;
+    devtree_info->speed    = _dev0.speed;
+  }
+}
+
+void hcd_event_handler(hcd_event_t const* event, bool in_isr)
+{
+  switch (event->event_id)
+  {
+    default:
+      osal_queue_send(_usbh_q, event, in_isr);
+    break;
+  }
+}
+
+void hcd_event_xfer_complete(uint8_t dev_addr, uint8_t ep_addr, uint32_t xferred_bytes, xfer_result_t result, bool in_isr)
+{
+  hcd_event_t event =
+  {
+    .rhport   = 0, // TODO correct rhport
+    .event_id = HCD_EVENT_XFER_COMPLETE,
+    .dev_addr = dev_addr,
+    .xfer_complete =
+    {
+      .ep_addr = ep_addr,
+      .result  = result,
+      .len     = xferred_bytes
+    }
+  };
+
+  hcd_event_handler(&event, in_isr);
+}
+
+void hcd_event_device_attach(uint8_t rhport, bool in_isr)
+{
+  hcd_event_t event =
+  {
+    .rhport   = rhport,
+    .event_id = HCD_EVENT_DEVICE_ATTACH
+  };
+
+  event.connection.hub_addr = 0;
+  event.connection.hub_port = 0;
+
+  hcd_event_handler(&event, in_isr);
+}
+
+void hcd_event_device_remove(uint8_t hostid, bool in_isr)
+{
+  hcd_event_t event =
+  {
+    .rhport   = hostid,
+    .event_id = HCD_EVENT_DEVICE_REMOVE
+  };
+
+  event.connection.hub_addr = 0;
+  event.connection.hub_port = 0;
+
+  hcd_event_handler(&event, in_isr);
+}
+
+
+// a device unplugged on hostid, hub_addr, hub_port
+// return true if found and unmounted device, false if cannot find
+void process_device_unplugged(uint8_t rhport, uint8_t hub_addr, uint8_t hub_port)
+{
+  //------------- find the all devices (star-network) under port that is unplugged -------------//
+  // TODO mark as disconnected in ISR, also handle dev0
+  for ( uint8_t dev_id = 0; dev_id < TU_ARRAY_SIZE(_usbh_devices); dev_id++ )
+  {
+    usbh_device_t* dev = &_usbh_devices[dev_id];
+    uint8_t const dev_addr = dev_id+1;
+
+    // TODO Hub multiple level
+    if (dev->rhport == rhport   &&
+        (hub_addr == 0 || dev->hub_addr == hub_addr) && // hub_addr == 0 & hub_port == 0 means roothub
+        (hub_port == 0 || dev->hub_port == hub_port) &&
+        dev->state    != TUSB_DEVICE_STATE_UNPLUG)
+    {
+      // Invoke callback before close driver
+      if (tuh_umount_cb) tuh_umount_cb(dev_addr);
+
+      // Close class driver
+      for (uint8_t drv_id = 0; drv_id < USBH_CLASS_DRIVER_COUNT; drv_id++)
+      {
+        TU_LOG2("%s close\r\n", usbh_class_drivers[drv_id].name);
+        usbh_class_drivers[drv_id].close(dev_addr);
+      }
+
+      hcd_device_close(rhport, dev_addr);
+
+      // release all endpoints associated with the device
+      memset(dev->itf2drv, DRVID_INVALID, sizeof(dev->itf2drv)); // invalid mapping
+      memset(dev->ep2drv , DRVID_INVALID, sizeof(dev->ep2drv )); // invalid mapping
+      tu_memclr(dev->ep_status, sizeof(dev->ep_status));
+
+      dev->state = TUSB_DEVICE_STATE_UNPLUG;
+    }
+  }
+}
+
+//--------------------------------------------------------------------+
+// INTERNAL HELPER
+//--------------------------------------------------------------------+
+static uint8_t get_new_address(bool is_hub)
+{
+  uint8_t const start = (is_hub ? CFG_TUH_DEVICE_MAX : 0) + 1;
+  uint8_t const count = (is_hub ? CFG_TUH_HUB : CFG_TUH_DEVICE_MAX);
+
+  for (uint8_t i=0; i < count; i++)
+  {
+    uint8_t const addr = start + i;
+    if (get_device(addr)->state == TUSB_DEVICE_STATE_UNPLUG) return addr;
+  }
+  return ADDR_INVALID;
+}
+
+void usbh_driver_set_config_complete(uint8_t dev_addr, uint8_t itf_num)
+{
+  usbh_device_t* dev = get_device(dev_addr);
+
+  for(itf_num++; itf_num < sizeof(dev->itf2drv); itf_num++)
+  {
+    // continue with next valid interface
+    // TODO skip IAD binding interface such as CDCs
+    uint8_t const drv_id = dev->itf2drv[itf_num];
+    if (drv_id != DRVID_INVALID)
+    {
+      usbh_class_driver_t const * driver = &usbh_class_drivers[drv_id];
+      TU_LOG2("%s set config: itf = %u\r\n", driver->name, itf_num);
+      driver->set_config(dev_addr, itf_num);
+      break;
+    }
+  }
+
+  // all interface are configured
+  if (itf_num == sizeof(dev->itf2drv))
+  {
+    // Invoke callback if available
+    if (tuh_mount_cb) tuh_mount_cb(dev_addr);
+  }
+}
+
+//--------------------------------------------------------------------+
+// Enumeration Process
+// is a lengthy process with a seires of control transfer to configure
+// newly attached device. Each step is handled by a function in this
+// section
+// TODO due to the shared _usbh_ctrl_buf, we must complete enumerating
+// one device before enumerating another one.
+//--------------------------------------------------------------------+
+
+static bool enum_request_addr0_device_desc(void);
+static bool enum_request_set_addr(void);
+
+static bool enum_get_addr0_device_desc_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool enum_set_address_complete           (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool enum_get_device_desc_complete       (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool enum_get_9byte_config_desc_complete (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool enum_get_config_desc_complete       (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool enum_set_config_complete            (uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+static bool parse_configuration_descriptor      (uint8_t dev_addr, tusb_desc_configuration_t const* desc_cfg);
+
+#if CFG_TUH_HUB
+static bool enum_hub_clear_reset0_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) dev_addr; (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+  enum_request_addr0_device_desc();
+  return true;
+}
+
+static bool enum_hub_clear_reset1_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) dev_addr; (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  enum_request_set_addr();
+
+  // done with hub, waiting for next data on status pipe
+  (void) hub_status_pipe_queue( _dev0.hub_addr );
+
+  return true;
+}
+
+static bool enum_hub_get_status1_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) dev_addr; (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  hub_port_status_response_t port_status;
+  memcpy(&port_status, _usbh_ctrl_buf, sizeof(hub_port_status_response_t));
+
+  // Acknowledge Port Reset Change if Reset Successful
+  if (port_status.change.reset)
+  {
+    TU_ASSERT( hub_port_clear_feature(_dev0.hub_addr, _dev0.hub_port, HUB_FEATURE_PORT_RESET_CHANGE, enum_hub_clear_reset1_complete) );
+  }
+
+  return true;
+}
+
+static bool enum_hub_get_status0_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) dev_addr; (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  hub_port_status_response_t port_status;
+  memcpy(&port_status, _usbh_ctrl_buf, sizeof(hub_port_status_response_t));
+
+  if ( !port_status.status.connection )
+  {
+    // device unplugged while delaying, nothing else to do, queue hub status
+    return hub_status_pipe_queue(dev_addr);
+  }
+
+  _dev0.speed = (port_status.status.high_speed) ? TUSB_SPEED_HIGH :
+                (port_status.status.low_speed ) ? TUSB_SPEED_LOW  : TUSB_SPEED_FULL;
+
+  // Acknowledge Port Reset Change
+  if (port_status.change.reset)
+  {
+    hub_port_clear_feature(_dev0.hub_addr, _dev0.hub_port, HUB_FEATURE_PORT_RESET_CHANGE, enum_hub_clear_reset0_complete);
+  }
+
+  return true;
+}
+#endif
+
+static bool enum_new_device(hcd_event_t* event)
+{
+  _dev0.rhport   = event->rhport; // TODO refractor integrate to device_pool
+  _dev0.hub_addr = event->connection.hub_addr;
+  _dev0.hub_port = event->connection.hub_port;
+
+  //------------- connected/disconnected directly with roothub -------------//
+  if (_dev0.hub_addr == 0)
+  {
+    // wait until device is stable TODO non blocking
+    osal_task_delay(RESET_DELAY);
+
+    // device unplugged while delaying
+    if ( !hcd_port_connect_status(_dev0.rhport) ) return true;
+
+    _dev0.speed = hcd_port_speed_get(_dev0.rhport );
+
+    enum_request_addr0_device_desc();
+  }
+#if CFG_TUH_HUB
+  //------------- connected/disconnected via hub -------------//
+  else
+  {
+    // wait until device is stable
+    osal_task_delay(RESET_DELAY);
+    TU_ASSERT( hub_port_get_status(_dev0.hub_addr, _dev0.hub_port, _usbh_ctrl_buf, enum_hub_get_status0_complete) );
+  }
+#endif // CFG_TUH_HUB
+
+  return true;
+}
+
+static bool enum_request_addr0_device_desc(void)
+{
+  // TODO probably doesn't need to open/close each enumeration
+  uint8_t const addr0 = 0;
+  TU_ASSERT( usbh_edpt_control_open(addr0, 8) );
+
+  //------------- Get first 8 bytes of device descriptor to get Control Endpoint Size -------------//
+  TU_LOG2("Get 8 byte of Device Descriptor\r\n");
+  tusb_control_request_t const request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_STANDARD,
+      .direction = TUSB_DIR_IN
+    },
+    .bRequest = TUSB_REQ_GET_DESCRIPTOR,
+    .wValue   = TUSB_DESC_DEVICE << 8,
+    .wIndex   = 0,
+    .wLength  = 8
+  };
+  TU_ASSERT( tuh_control_xfer(addr0, &request, _usbh_ctrl_buf, enum_get_addr0_device_desc_complete) );
+
+  return true;
+}
+
+// After Get Device Descriptor of Address 0
+static bool enum_get_addr0_device_desc_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) request;
+  TU_ASSERT(0 == dev_addr);
+
+  if (XFER_RESULT_SUCCESS != result)
+  {
+#if CFG_TUH_HUB
+    // TODO remove, waiting for next data on status pipe
+    if (_dev0.hub_addr != 0) hub_status_pipe_queue(_dev0.hub_addr);
+#endif
+
+    return false;
+  }
+
+  tusb_desc_device_t const * desc_device = (tusb_desc_device_t const*) _usbh_ctrl_buf;
+  TU_ASSERT( tu_desc_type(desc_device) == TUSB_DESC_DEVICE );
+
+  // Reset device again before Set Address
+  TU_LOG2("Port reset \r\n");
+
+  if (_dev0.hub_addr == 0)
+  {
+    // connected directly to roothub
+    hcd_port_reset( _dev0.rhport ); // reset port after 8 byte descriptor
+    osal_task_delay(RESET_DELAY);
+
+    enum_request_set_addr();
+  }
+#if CFG_TUH_HUB
+  else
+  {
+    // after RESET_DELAY the hub_port_reset() already complete
+    TU_ASSERT( hub_port_reset(_dev0.hub_addr, _dev0.hub_port, NULL) );
+    osal_task_delay(RESET_DELAY);
+
+    tuh_task(); // FIXME temporarily to clean up port_reset control transfer
+
+    TU_ASSERT( hub_port_get_status(_dev0.hub_addr, _dev0.hub_port, _usbh_ctrl_buf, enum_hub_get_status1_complete) );
+  }
+#endif
+
+  return true;
+}
+
+static bool enum_request_set_addr(void)
+{
+  uint8_t const addr0 = 0;
+  tusb_desc_device_t const * desc_device = (tusb_desc_device_t const*) _usbh_ctrl_buf;
+
+  // Get new address
+  uint8_t const new_addr = get_new_address(desc_device->bDeviceClass == TUSB_CLASS_HUB);
+  TU_ASSERT(new_addr != ADDR_INVALID);
+
+  TU_LOG2("Set Address = %d\r\n", new_addr);
+
+  usbh_device_t* new_dev = get_device(new_addr);
+
+  new_dev->rhport    = _dev0.rhport;
+  new_dev->hub_addr  = _dev0.hub_addr;
+  new_dev->hub_port  = _dev0.hub_port;
+  new_dev->speed     = _dev0.speed;
+  new_dev->connected = 1;
+  new_dev->ep0_size  = desc_device->bMaxPacketSize0;
+
+  tusb_control_request_t const new_request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_STANDARD,
+      .direction = TUSB_DIR_OUT
+    },
+    .bRequest = TUSB_REQ_SET_ADDRESS,
+    .wValue   = new_addr,
+    .wIndex   = 0,
+    .wLength  = 0
+  };
+
+  TU_ASSERT( tuh_control_xfer(addr0, &new_request, NULL, enum_set_address_complete) );
+
+  return true;
+}
+
+// After SET_ADDRESS is complete
+static bool enum_set_address_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  TU_ASSERT(0 == dev_addr);
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  uint8_t const new_addr = (uint8_t const) request->wValue;
+
+  usbh_device_t* new_dev = get_device(new_addr);
+  new_dev->addressed = 1;
+
+  // TODO close device 0, may not be needed
+  hcd_device_close(_dev0.rhport, 0);
+
+  // open control pipe for new address
+  TU_ASSERT( usbh_edpt_control_open(new_addr, new_dev->ep0_size) );
+
+  // Get full device descriptor
+  TU_LOG2("Get Device Descriptor\r\n");
+  tusb_control_request_t const new_request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_STANDARD,
+      .direction = TUSB_DIR_IN
+    },
+    .bRequest = TUSB_REQ_GET_DESCRIPTOR,
+    .wValue   = TUSB_DESC_DEVICE << 8,
+    .wIndex   = 0,
+    .wLength  = sizeof(tusb_desc_device_t)
+  };
+
+  TU_ASSERT(tuh_control_xfer(new_addr, &new_request, _usbh_ctrl_buf, enum_get_device_desc_complete));
+
+  return true;
+}
+
+static bool enum_get_device_desc_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  tusb_desc_device_t const * desc_device = (tusb_desc_device_t const*) _usbh_ctrl_buf;
+  usbh_device_t* dev = get_device(dev_addr);
+
+  dev->vid            = desc_device->idVendor;
+  dev->pid            = desc_device->idProduct;
+  dev->i_manufacturer = desc_device->iManufacturer;
+  dev->i_product      = desc_device->iProduct;
+  dev->i_serial       = desc_device->iSerialNumber;
+
+//  if (tuh_attach_cb) tuh_attach_cb((tusb_desc_device_t*) _usbh_ctrl_buf);
+
+  TU_LOG2("Get 9 bytes of Configuration Descriptor\r\n");
+  tusb_control_request_t const new_request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_STANDARD,
+      .direction = TUSB_DIR_IN
+    },
+    .bRequest = TUSB_REQ_GET_DESCRIPTOR,
+    .wValue   = (TUSB_DESC_CONFIGURATION << 8) | (CONFIG_NUM - 1),
+    .wIndex   = 0,
+    .wLength  = 9
+  };
+
+  TU_ASSERT( tuh_control_xfer(dev_addr, &new_request, _usbh_ctrl_buf, enum_get_9byte_config_desc_complete) );
+
+  return true;
+}
+
+static bool enum_get_9byte_config_desc_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  // TODO not enough buffer to hold configuration descriptor
+  uint8_t const * desc_config = _usbh_ctrl_buf;
+
+  // Use offsetof to avoid pointer to the odd/misaligned address
+  uint16_t const total_len = tu_le16toh( tu_unaligned_read16(desc_config + offsetof(tusb_desc_configuration_t, wTotalLength)) );
+
+  TU_ASSERT(total_len <= CFG_TUH_ENUMERATION_BUFSIZE);
+
+  // Get full configuration descriptor
+  TU_LOG2("Get Configuration Descriptor\r\n");
+  tusb_control_request_t const new_request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_STANDARD,
+      .direction = TUSB_DIR_IN
+    },
+    .bRequest = TUSB_REQ_GET_DESCRIPTOR,
+    .wValue   = (TUSB_DESC_CONFIGURATION << 8) | (CONFIG_NUM - 1),
+    .wIndex   = 0,
+    .wLength  = total_len
+
+  };
+
+  TU_ASSERT( tuh_control_xfer(dev_addr, &new_request, _usbh_ctrl_buf, enum_get_config_desc_complete) );
+
+  return true;
+}
+
+static bool enum_get_config_desc_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  // Parse configuration & set up drivers
+  // Driver open aren't allowed to make any usb transfer yet
+  TU_ASSERT( parse_configuration_descriptor(dev_addr, (tusb_desc_configuration_t*) _usbh_ctrl_buf) );
+
+  TU_LOG2("Set Configuration = %d\r\n", CONFIG_NUM);
+  tusb_control_request_t const new_request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_STANDARD,
+      .direction = TUSB_DIR_OUT
+    },
+    .bRequest = TUSB_REQ_SET_CONFIGURATION,
+    .wValue   = CONFIG_NUM,
+    .wIndex   = 0,
+    .wLength  = 0
+  };
+
+  TU_ASSERT( tuh_control_xfer(dev_addr, &new_request, NULL, enum_set_config_complete) );
+
+  return true;
+}
+
+static bool enum_set_config_complete(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result)
+{
+  (void) request;
+  TU_ASSERT(XFER_RESULT_SUCCESS == result);
+
+  TU_LOG2("Device configured\r\n");
+  usbh_device_t* dev = get_device(dev_addr);
+  dev->configured = 1;
+  dev->state = TUSB_DEVICE_STATE_CONFIGURED;
+
+  // Start the Set Configuration process for interfaces (itf = DRVID_INVALID)
+  // Since driver can perform control transfer within its set_config, this is done asynchronously.
+  // The process continue with next interface when class driver complete its sequence with usbh_driver_set_config_complete()
+  // TODO use separated API instead of using DRVID_INVALID
+  usbh_driver_set_config_complete(dev_addr, DRVID_INVALID);
+
+  return true;
+}
+
+static bool parse_configuration_descriptor(uint8_t dev_addr, tusb_desc_configuration_t const* desc_cfg)
+{
+  usbh_device_t* dev = get_device(dev_addr);
+
+  uint8_t const* desc_end = ((uint8_t const*) desc_cfg) + tu_le16toh(desc_cfg->wTotalLength);
+  uint8_t const* p_desc   = tu_desc_next(desc_cfg);
+
+  // parse each interfaces
+  while( p_desc < desc_end )
+  {
+    uint8_t assoc_itf_count = 1;
+
+    // Class will always starts with Interface Association (if any) and then Interface descriptor
+    if ( TUSB_DESC_INTERFACE_ASSOCIATION == tu_desc_type(p_desc) )
+    {
+      tusb_desc_interface_assoc_t const * desc_iad = (tusb_desc_interface_assoc_t const *) p_desc;
+      assoc_itf_count = desc_iad->bInterfaceCount;
+
+      p_desc = tu_desc_next(p_desc); // next to Interface
+
+      // IAD's first interface number and class should match with opened interface
+      //TU_ASSERT(desc_iad->bFirstInterface == desc_itf->bInterfaceNumber &&
+      //          desc_iad->bFunctionClass  == desc_itf->bInterfaceClass);
+    }
+
+    TU_ASSERT( TUSB_DESC_INTERFACE == tu_desc_type(p_desc) );
+    tusb_desc_interface_t const* desc_itf = (tusb_desc_interface_t const*) p_desc;
+
+#if CFG_TUH_MIDI
+    // MIDI has 2 interfaces (Audio Control v1 + MIDIStreaming) but does not have IAD
+    // manually increase the associated count
+    if (1                              == assoc_itf_count              &&
+        TUSB_CLASS_AUDIO               == desc_itf->bInterfaceClass    &&
+        AUDIO_SUBCLASS_CONTROL         == desc_itf->bInterfaceSubClass &&
+        AUDIO_FUNC_PROTOCOL_CODE_UNDEF == desc_itf->bInterfaceProtocol)
+    {
+      assoc_itf_count = 2;
+    }
+#endif
+
+    uint16_t const drv_len = tu_desc_get_interface_total_len(desc_itf, assoc_itf_count, desc_end-p_desc);
+    TU_ASSERT(drv_len >= sizeof(tusb_desc_interface_t));
+
+    if (desc_itf->bInterfaceClass == TUSB_CLASS_HUB && dev->hub_addr != 0)
+    {
+      // TODO Attach hub to Hub is not currently supported
+      // skip this interface
+      TU_LOG(USBH_DBG_LVL, "Only 1 level of HUB is supported\r\n");
+    }
+    else
+    {
+      // Find driver for this interface
+      uint8_t drv_id;
+      for (drv_id = 0; drv_id < USBH_CLASS_DRIVER_COUNT; drv_id++)
+      {
+        usbh_class_driver_t const * driver = &usbh_class_drivers[drv_id];
+
+        if ( driver->open(dev->rhport, dev_addr, desc_itf, drv_len) )
+        {
+          // open successfully
+          TU_LOG2("  %s opened\r\n", driver->name);
+
+          // bind (associated) interfaces to found driver
+          for(uint8_t i=0; i<assoc_itf_count; i++)
+          {
+            uint8_t const itf_num = desc_itf->bInterfaceNumber+i;
+
+            // Interface number must not be used already
+            TU_ASSERT( DRVID_INVALID == dev->itf2drv[itf_num] );
+            dev->itf2drv[itf_num] = drv_id;
+          }
+
+          // bind all endpoints to found driver
+          tu_edpt_bind_driver(dev->ep2drv, desc_itf, drv_len, drv_id);
+
+          break; // exit driver find loop
+        }
+      }
+
+      if( drv_id >= USBH_CLASS_DRIVER_COUNT )
+      {
+        TU_LOG(USBH_DBG_LVL, "Interface %u: class = %u subclass = %u protocol = %u is not supported\r\n",
+               desc_itf->bInterfaceNumber, desc_itf->bInterfaceClass, desc_itf->bInterfaceSubClass, desc_itf->bInterfaceProtocol);
+      }
+    }
+
+    // next Interface or IAD descriptor
+    p_desc += drv_len;
+  }
+
+  return true;
+}
+
+//--------------------------------------------------------------------+
+// Endpoint API
+//--------------------------------------------------------------------+
+
+// TODO has some duplication code with device, refactor later
+bool usbh_edpt_claim(uint8_t dev_addr, uint8_t ep_addr)
+{
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
+  usbh_device_t* dev = get_device(dev_addr);
+
+#if CFG_TUSB_OS != OPT_OS_NONE
+  // pre-check to help reducing mutex lock
+  TU_VERIFY((dev->ep_status[epnum][dir].busy == 0) && (dev->ep_status[epnum][dir].claimed == 0));
+  osal_mutex_lock(dev->mutex, OSAL_TIMEOUT_WAIT_FOREVER);
+#endif
+
+  // can only claim the endpoint if it is not busy and not claimed yet.
+  bool const ret = (dev->ep_status[epnum][dir].busy == 0) && (dev->ep_status[epnum][dir].claimed == 0);
+  if (ret)
+  {
+    dev->ep_status[epnum][dir].claimed = 1;
+  }
+
+#if CFG_TUSB_OS != OPT_OS_NONE
+  osal_mutex_unlock(dev->mutex);
+#endif
+
+  return ret;
+}
+
+// TODO has some duplication code with device, refactor later
+bool usbh_edpt_release(uint8_t dev_addr, uint8_t ep_addr)
+{
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
+  usbh_device_t* dev = get_device(dev_addr);
+
+#if CFG_TUSB_OS != OPT_OS_NONE
+  osal_mutex_lock(dev->mutex, OSAL_TIMEOUT_WAIT_FOREVER);
+#endif
+
+  // can only release the endpoint if it is claimed and not busy
+  bool const ret = (dev->ep_status[epnum][dir].busy == 0) && (dev->ep_status[epnum][dir].claimed == 1);
+  if (ret)
+  {
+    dev->ep_status[epnum][dir].claimed = 0;
+  }
+
+#if CFG_TUSB_OS != OPT_OS_NONE
+  osal_mutex_unlock(dev->mutex);
+#endif
+
+  return ret;
+}
+
+// TODO has some duplication code with device, refactor later
+bool usbh_edpt_xfer(uint8_t dev_addr, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)
+{
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
+  usbh_device_t* dev = get_device(dev_addr);
+
+  TU_LOG2("  Queue EP %02X with %u bytes ... ", ep_addr, total_bytes);
+
+  // Attempt to transfer on a busy endpoint, sound like an race condition !
+  TU_ASSERT(dev->ep_status[epnum][dir].busy == 0);
+
+  // Set busy first since the actual transfer can be complete before hcd_edpt_xfer()
+  // could return and USBH task can preempt and clear the busy
+  dev->ep_status[epnum][dir].busy = true;
+
+  if ( hcd_edpt_xfer(dev->rhport, dev_addr, ep_addr, buffer, total_bytes) )
+  {
+    TU_LOG2("OK\r\n");
+    return true;
+  }else
+  {
+    // HCD error, mark endpoint as ready to allow next transfer
+    dev->ep_status[epnum][dir].busy = false;
+    dev->ep_status[epnum][dir].claimed = 0;
+    TU_LOG2("failed\r\n");
+    TU_BREAKPOINT();
+    return false;
+  }
+}
+
+static bool usbh_edpt_control_open(uint8_t dev_addr, uint8_t max_packet_size)
+{
+  TU_LOG2("Open EP0 with Size = %u (addr = %u)\r\n", max_packet_size, dev_addr);
+
+  tusb_desc_endpoint_t ep0_desc =
+  {
+    .bLength          = sizeof(tusb_desc_endpoint_t),
+    .bDescriptorType  = TUSB_DESC_ENDPOINT,
+    .bEndpointAddress = 0,
+    .bmAttributes     = { .xfer = TUSB_XFER_CONTROL },
+    .wMaxPacketSize   = max_packet_size,
+    .bInterval        = 0
+  };
+
+  return hcd_edpt_open(usbh_get_rhport(dev_addr), dev_addr, &ep0_desc);
+}
+
+bool usbh_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const * desc_ep)
+{
+  usbh_device_t* dev = get_device(dev_addr);
+  TU_ASSERT(tu_edpt_validate(desc_ep, (tusb_speed_t) dev->speed));
+
+  return hcd_edpt_open(rhport, dev_addr, desc_ep);
+}
+
+bool usbh_edpt_busy(uint8_t dev_addr, uint8_t ep_addr)
+{
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
+  usbh_device_t* dev = get_device(dev_addr);
+
+  return dev->ep_status[epnum][dir].busy;
+}
+
+
+
+#endif
diff --git a/src/host/usbh.h b/src/host/usbh.h
new file mode 100644
index 0000000..8411cad
--- /dev/null
+++ b/src/host/usbh.h
@@ -0,0 +1,99 @@
+/* 
+ * 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_USBH_H_
+#define _TUSB_USBH_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#include "common/tusb_common.h"
+#include "hcd.h"
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+
+typedef bool (*tuh_control_complete_cb_t)(uint8_t dev_addr, tusb_control_request_t const * request, xfer_result_t result);
+
+//--------------------------------------------------------------------+
+// APPLICATION API
+//--------------------------------------------------------------------+
+
+// Init host stack
+bool tuh_init(uint8_t rhport);
+
+// Check if host stack is already initialized
+bool tuh_inited(void);
+
+// Task function should be called in main/rtos loop
+void tuh_task(void);
+
+// Interrupt handler, name alias to HCD
+extern void hcd_int_handler(uint8_t rhport);
+#define tuh_int_handler   hcd_int_handler
+
+bool tuh_vid_pid_get(uint8_t dev_addr, uint16_t* vid, uint16_t* pid);
+tusb_speed_t tuh_speed_get(uint8_t dev_addr);
+
+// Check if device is connected and configured
+bool tuh_mounted(uint8_t dev_addr);
+
+// Check if device is suspended
+static inline bool tuh_suspended(uint8_t dev_addr)
+{
+  // TODO implement suspend & resume on host
+  (void) dev_addr;
+  return false;
+}
+
+// Check if device is ready to communicate with
+TU_ATTR_ALWAYS_INLINE
+static inline bool tuh_ready(uint8_t dev_addr)
+{
+  return tuh_mounted(dev_addr) && !tuh_suspended(dev_addr);
+}
+
+// Carry out control transfer
+bool tuh_control_xfer (uint8_t dev_addr, tusb_control_request_t const* request, void* buffer, tuh_control_complete_cb_t complete_cb);
+
+//--------------------------------------------------------------------+
+// APPLICATION CALLBACK
+//--------------------------------------------------------------------+
+//TU_ATTR_WEAK uint8_t tuh_attach_cb (tusb_desc_device_t const *desc_device);
+
+// Invoked when device is mounted (configured)
+TU_ATTR_WEAK void tuh_mount_cb (uint8_t dev_addr);
+
+/// Invoked when device is unmounted (bus reset/unplugged)
+TU_ATTR_WEAK void tuh_umount_cb(uint8_t dev_addr);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
diff --git a/src/host/usbh_classdriver.h b/src/host/usbh_classdriver.h
new file mode 100644
index 0000000..8bc2622
--- /dev/null
+++ b/src/host/usbh_classdriver.h
@@ -0,0 +1,83 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, 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_USBH_CLASSDRIVER_H_
+#define _TUSB_USBH_CLASSDRIVER_H_
+
+#include "osal/osal.h"
+#include "common/tusb_fifo.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Class Driver API
+//--------------------------------------------------------------------+
+
+typedef struct {
+  #if CFG_TUSB_DEBUG >= 2
+  char const* name;
+  #endif
+
+  void (* const init       )(void);
+  bool (* const open       )(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
+  bool (* const set_config )(uint8_t dev_addr, uint8_t itf_num);
+  bool (* const xfer_cb    )(uint8_t dev_addr, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes);
+  void (* const close      )(uint8_t dev_addr);
+} usbh_class_driver_t;
+
+// Call by class driver to tell USBH that it has complete the enumeration
+void usbh_driver_set_config_complete(uint8_t dev_addr, uint8_t itf_num);
+
+uint8_t usbh_get_rhport(uint8_t dev_addr);
+
+uint8_t* usbh_get_enum_buf(void);
+
+//--------------------------------------------------------------------+
+// USBH Endpoint API
+//--------------------------------------------------------------------+
+
+// Open an endpoint
+bool usbh_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const * desc_ep);
+
+// Submit a usb transfer
+bool usbh_edpt_xfer(uint8_t dev_addr, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes);
+
+// Claim an endpoint before submitting a transfer.
+// If caller does not make any transfer, it must release endpoint for others.
+bool usbh_edpt_claim(uint8_t dev_addr, uint8_t ep_addr);
+
+bool usbh_edpt_release(uint8_t dev_addr, uint8_t ep_addr);
+
+// Check if endpoint transferring is complete
+bool usbh_edpt_busy(uint8_t dev_addr, uint8_t ep_addr);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
diff --git a/src/host/usbh_control.c b/src/host/usbh_control.c
new file mode 100644
index 0000000..9204576
--- /dev/null
+++ b/src/host/usbh_control.c
@@ -0,0 +1,138 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, 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.
+ */
+
+#include "tusb_option.h"
+
+#if TUSB_OPT_HOST_ENABLED
+
+#include "tusb.h"
+#include "usbh_classdriver.h"
+
+enum
+{
+  STAGE_SETUP,
+  STAGE_DATA,
+  STAGE_ACK
+};
+
+typedef struct
+{
+  tusb_control_request_t request TU_ATTR_ALIGNED(4);
+
+  uint8_t stage;
+  uint8_t* buffer;
+  tuh_control_complete_cb_t complete_cb;
+} usbh_control_xfer_t;
+
+static usbh_control_xfer_t _ctrl_xfer;
+
+//CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN
+//static uint8_t _tuh_ctrl_buf[CFG_TUH_ENUMERATION_BUFSIZE];
+
+//--------------------------------------------------------------------+
+// MACRO TYPEDEF CONSTANT ENUM DECLARATION
+//--------------------------------------------------------------------+
+
+bool tuh_control_xfer (uint8_t dev_addr, tusb_control_request_t const* request, void* buffer, tuh_control_complete_cb_t complete_cb)
+{
+  // TODO need to claim the endpoint first
+  const uint8_t rhport = usbh_get_rhport(dev_addr);
+
+  _ctrl_xfer.request     = (*request);
+  _ctrl_xfer.buffer      = buffer;
+  _ctrl_xfer.stage       = STAGE_SETUP;
+  _ctrl_xfer.complete_cb = complete_cb;
+
+  TU_LOG2("Control Setup (addr = %u): ", dev_addr);
+  TU_LOG2_VAR(request);
+  TU_LOG2("\r\n");
+
+  // Send setup packet
+  TU_ASSERT( hcd_setup_send(rhport, dev_addr, (uint8_t const*) &_ctrl_xfer.request) );
+
+  return true;
+}
+
+static void _xfer_complete(uint8_t dev_addr, xfer_result_t result)
+{
+  TU_LOG2("\r\n");
+  if (_ctrl_xfer.complete_cb) _ctrl_xfer.complete_cb(dev_addr, &_ctrl_xfer.request, result);
+}
+
+bool usbh_control_xfer_cb (uint8_t dev_addr, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes)
+{
+  (void) ep_addr;
+  (void) xferred_bytes;
+
+  const uint8_t rhport = usbh_get_rhport(dev_addr);
+
+  tusb_control_request_t const * request = &_ctrl_xfer.request;
+
+  if (XFER_RESULT_SUCCESS != result)
+  {
+    TU_LOG2("Control failed: result = %d\r\n", result);
+
+    // terminate transfer if any stage failed
+    _xfer_complete(dev_addr, result);
+  }else
+  {
+    switch(_ctrl_xfer.stage)
+    {
+      case STAGE_SETUP:
+        _ctrl_xfer.stage = STAGE_DATA;
+        if (request->wLength)
+        {
+          // DATA stage: initial data toggle is always 1
+          hcd_edpt_xfer(rhport, dev_addr, tu_edpt_addr(0, request->bmRequestType_bit.direction), _ctrl_xfer.buffer, request->wLength);
+          return true;
+        }
+        __attribute__((fallthrough));
+
+      case STAGE_DATA:
+        _ctrl_xfer.stage = STAGE_ACK;
+
+        if (request->wLength)
+        {
+          TU_LOG2("Control data (addr = %u):\r\n", dev_addr);
+          TU_LOG2_MEM(_ctrl_xfer.buffer, request->wLength, 2);
+        }
+
+        // ACK stage: toggle is always 1
+        hcd_edpt_xfer(rhport, dev_addr, tu_edpt_addr(0, 1-request->bmRequestType_bit.direction), NULL, 0);
+      break;
+
+      case STAGE_ACK:
+        _xfer_complete(dev_addr, result);
+      break;
+
+      default: return false;
+    }
+  }
+
+  return true;
+}
+
+#endif