diff --git a/tests/test/host/test_usbd_host.c b/tests/test/host/test_usbd_host.c
index 944dc40f1..fc59769f0 100644
--- a/tests/test/host/test_usbd_host.c
+++ b/tests/test/host/test_usbd_host.c
@@ -46,7 +46,7 @@ tusb_handle_device_t dev_hdl;
 void setUp(void)
 {
   dev_hdl = 0;
-  device_info_pool[dev_hdl].status = TUSB_DEVICE_STATUS_READY;
+  memset(device_info_pool, 0, TUSB_CFG_HOST_DEVICE_MAX*sizeof(usbh_device_info_t));
 }
 
 void tearDown(void)
@@ -133,10 +133,60 @@ void queue_recv_stub (osal_queue_handle_t const queue_hdl, uint32_t *p_data, uin
   (*p_error) = TUSB_ERROR_NONE;
 }
 
+tusb_error_t pipe_control_stub(pipe_handle_t pipe_hdl, const tusb_std_request_t * const p_request, uint8_t data[], int num_call)
+{
+  tusb_descriptor_device_t dev_desc =
+  {
+      .bLength            = sizeof(tusb_descriptor_device_t),
+      .bDescriptorType    = TUSB_DESC_DEVICE,
+      .bcdUSB             = 0x0200,
+      .bDeviceClass       = 0x00,
+      .bDeviceSubClass    = 0x00,
+      .bDeviceProtocol    = 0x00,
+
+      .bMaxPacketSize0    = 64,
+
+      .idVendor           = 0x1FC9,
+      .idProduct          = 0x4000,
+      .bcdDevice          = 0x0100,
+
+      .iManufacturer      = 0x01,
+      .iProduct           = 0x02,
+      .iSerialNumber      = 0x03,
+
+      .bNumConfigurations = 0x02
+  };
+
+  if (p_request->bRequest == TUSB_REQUEST_GET_DESCRIPTOR)
+  {
+    switch (p_request->wValue >> 8)
+    {
+      case TUSB_DESC_DEVICE:
+        memcpy(data, &dev_desc, p_request->wLength);
+      break;
+
+      default:
+        TEST_FAIL();
+      break;
+    }
+  }
+
+  return TUSB_ERROR_NONE;
+}
+
 void test_enum_task_connect(void)
 {
+  pipe_handle_t pipe_addr0 = 12;
+
+
+
   osal_queue_receive_StubWithCallback(queue_recv_stub);
   hcd_port_connect_status_ExpectAndReturn(enum_connect.core_id, true);
+  hcd_port_speed_ExpectAndReturn(enum_connect.core_id, TUSB_SPEED_FULL);
+  hcd_pipe_addr0_open_ExpectAndReturn(enum_connect.core_id, TUSB_SPEED_FULL, 0, 0, pipe_addr0);
+
+  hcd_pipe_control_xfer_StubWithCallback(pipe_control_stub);
+//  hcd_pipe_control_open_ExpectAnd(1, );
 
   usbh_enumeration_task();
 }
diff --git a/tests/test/test_osal_none.c b/tests/test/test_osal_none.c
index 3a5d5b812..b49d9eae2 100644
--- a/tests/test/test_osal_none.c
+++ b/tests/test/test_osal_none.c
@@ -108,27 +108,25 @@ void test_queue_send(void)
 void sample_task_semaphore(void)
 {
   tusb_error_t error = TUSB_ERROR_NONE;
-  OSAL_TASK_LOOP
-  {
-    OSAL_TASK_LOOP_BEGIN
 
-    statements[0]++;
+  OSAL_TASK_LOOP_BEGIN
 
-    osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_WAIT_FOREVER, &error);
-    statements[1]++;
+  statements[0]++;
 
-    osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_WAIT_FOREVER, &error);
-    statements[2]++;
+  osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_WAIT_FOREVER, &error);
+  statements[1]++;
 
-    osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_WAIT_FOREVER, &error);
-    statements[3]++;
+  osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_WAIT_FOREVER, &error);
+  statements[2]++;
 
-    osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_NORMAL, &error);
-    statements[4]++;
-    TEST_ASSERT_EQUAL(TUSB_ERROR_OSAL_TIMEOUT, error);
+  osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_WAIT_FOREVER, &error);
+  statements[3]++;
 
-    OSAL_TASK_LOOP_END
-  }
+  osal_semaphore_wait(sem_hdl, OSAL_TIMEOUT_NORMAL, &error);
+  statements[4]++;
+  TEST_ASSERT_EQUAL(TUSB_ERROR_OSAL_TIMEOUT, error);
+
+  OSAL_TASK_LOOP_END
 }
 
 void test_task_with_semaphore(void)
@@ -168,30 +166,27 @@ void sample_task_with_queue(void)
   uint32_t data;
   tusb_error_t error;
 
-  OSAL_TASK_LOOP
-  {
-    OSAL_TASK_LOOP_BEGIN
+  OSAL_TASK_LOOP_BEGIN
 
-    statements[0]++;
+  statements[0]++;
 
-    osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_WAIT_FOREVER, &error);
-    TEST_ASSERT_EQUAL(0x1111, data);
-    statements[1]++;
+  osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_WAIT_FOREVER, &error);
+  TEST_ASSERT_EQUAL(0x1111, data);
+  statements[1]++;
 
-    osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_WAIT_FOREVER, &error);
-    TEST_ASSERT_EQUAL(0x2222, data);
-    statements[2]++;
+  osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_WAIT_FOREVER, &error);
+  TEST_ASSERT_EQUAL(0x2222, data);
+  statements[2]++;
 
-    osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_WAIT_FOREVER, &error);
-    TEST_ASSERT_EQUAL(0x3333, data);
-    statements[3]++;
+  osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_WAIT_FOREVER, &error);
+  TEST_ASSERT_EQUAL(0x3333, data);
+  statements[3]++;
 
-    osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_NORMAL, &error);
-    statements[4]++;
-    TEST_ASSERT_EQUAL(TUSB_ERROR_OSAL_TIMEOUT, error);
+  osal_queue_receive(queue_hdl, &data, OSAL_TIMEOUT_NORMAL, &error);
+  statements[4]++;
+  TEST_ASSERT_EQUAL(TUSB_ERROR_OSAL_TIMEOUT, error);
 
-    OSAL_TASK_LOOP_END
-  }
+  OSAL_TASK_LOOP_END
 }
 
 void test_task_with_queue(void)
diff --git a/tinyusb/common/assertion.h b/tinyusb/common/assertion.h
index 4f3678a50..c507d3a2a 100644
--- a/tinyusb/common/assertion.h
+++ b/tinyusb/common/assertion.h
@@ -70,7 +70,7 @@ extern "C"
 //--------------------------------------------------------------------+
 #define ASSERT_FILENAME  __FILE__
 #define ASSERT_FUNCTION  __PRETTY_FUNCTION__
-#define ASSERT_STATEMENT(format, ...)\
+#define ASSERT_MESSAGE(format, ...)\
     _PRINTF("Assert at %s: %s:%d: " format "\n", ASSERT_FILENAME, ASSERT_FUNCTION, __LINE__, __VA_ARGS__)
 
 #ifndef _TEST_ASSERT_
@@ -83,7 +83,7 @@ extern "C"
   do{\
     setup_statement;\
 	  if (!(condition)) {\
-	    ASSERT_STATEMENT(format, __VA_ARGS__);\
+	    ASSERT_MESSAGE(format, __VA_ARGS__);\
 	    ASSERT_ERROR_HANDLE(error);\
 	  }\
 	}while(0)
diff --git a/tinyusb/common/common.h b/tinyusb/common/common.h
index e6550e586..09a82a217 100644
--- a/tinyusb/common/common.h
+++ b/tinyusb/common/common.h
@@ -70,6 +70,7 @@
 #include "hal/hal.h"
 #include "core/tusb_types.h"
 #include "core/std_descriptors.h"
+#include "core/std_request.h"
 
 // TODO try to manipulate gcc cmd option instead
 #ifndef _TEST_
diff --git a/tinyusb/core/std_descriptors.h b/tinyusb/core/std_descriptors.h
index db7ba4110..dc43bce76 100644
--- a/tinyusb/core/std_descriptors.h
+++ b/tinyusb/core/std_descriptors.h
@@ -54,6 +54,9 @@
 
 #include "common/common.h"
 
+//--------------------------------------------------------------------+
+// STANDARD DESCRIPTORS
+//--------------------------------------------------------------------+
 /// USB Standard Device Descriptor (section 9.6.1, table 9-8)
 typedef ATTR_PREPACKED struct ATTR_PACKED {
   uint8_t  bLength            ; ///< Size of this descriptor in bytes.
diff --git a/tinyusb/core/std_request.h b/tinyusb/core/std_request.h
new file mode 100644
index 000000000..7b95fed8d
--- /dev/null
+++ b/tinyusb/core/std_request.h
@@ -0,0 +1,79 @@
+/*
+ * std_request.h
+ *
+ *  Created on: Feb 1, 2013
+ *      Author: hathach
+ */
+
+/*
+ * Software License Agreement (BSD License)
+ * Copyright (c) 2012, hathach (tinyusb.net)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the tiny usb stack.
+ */
+
+/** \file
+ *  \brief TBD
+ *
+ *  \note TBD
+ */
+
+/** \ingroup TBD
+ *  \defgroup TBD
+ *  \brief TBD
+ *
+ *  @{
+ */
+
+#ifndef _TUSB_STD_REQUEST_H_
+#define _TUSB_STD_REQUEST_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#include "common/common.h"
+
+typedef ATTR_PREPACKED struct ATTR_PACKED {
+  struct {
+    uint8_t recipient :  5; /**< Recipient type. */
+    uint8_t type      :  2; /**< Request type.  */
+    uint8_t direction :  1; /**< Direction type. */
+  } bmRequestType;
+
+  uint8_t  bRequest;
+  uint16_t wValue;
+  uint16_t wIndex;
+  uint16_t wLength;
+} tusb_std_request_t;
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_STD_REQUEST_H_ */
+
+/** @} */
diff --git a/tinyusb/core/tusb_types.h b/tinyusb/core/tusb_types.h
index 9550565d0..b683b35c9 100644
--- a/tinyusb/core/tusb_types.h
+++ b/tinyusb/core/tusb_types.h
@@ -68,6 +68,11 @@ typedef enum {
   TUSB_XFER_INTERRUPT
 }tusb_transfer_type_t;
 
+typedef enum {
+  TUSB_DIR_HOST_TO_DEV = 0,
+  TUSB_DIR_DEV_TO_HOST = 1
+}tusb_direction_t;
+
 /// TBD
 typedef enum {
   TUSB_PID_SETUP,
@@ -106,6 +111,19 @@ typedef enum {
   TUSB_REQUEST_SYNCH_FRAME         ///< 12
 }tusb_std_request_code_t;
 
+typedef enum {
+  TUSB_REQUEST_TYPE_STANDARD = 0,
+  TUSB_REQUEST_TYPE_CLASS,
+  TUSB_REQUEST_TYPE_VENDOR
+} tusb_std_request_type_t;
+
+typedef enum {
+  TUSB_REQUEST_RECIPIENT_DEVICE =0,
+  TUSB_REQUEST_RECIPIENT_INTERFACE,
+  TUSB_REQUEST_RECIPIENT_ENDPOINT,
+  TUSB_REQUEST_RECIPIENT_OTHER
+} tusb_std_request_recipient_t;
+
 typedef enum {
   TUSB_CLASS_UNSPECIFIED          = 0    , ///< 0
   TUSB_CLASS_AUDIO                = 1    , ///< 1
diff --git a/tinyusb/host/hcd.h b/tinyusb/host/hcd.h
index 415bb184a..d62c9290c 100644
--- a/tinyusb/host/hcd.h
+++ b/tinyusb/host/hcd.h
@@ -56,7 +56,6 @@
 #endif
 
 #include "common/common.h"
-#include "core/tusb_types.h"
 
 typedef uint32_t pipe_handle_t;
 
@@ -66,7 +65,11 @@ tusb_error_t hcd_init(uint8_t hostid) ATTR_WARN_UNUSED_RESULT;
 //--------------------------------------------------------------------+
 // PIPE API
 //--------------------------------------------------------------------+
-//pipe_handle_t hcd_pipe_control_open(core_id, speed, hub_addr, hub_port, dev_addr, max_packet_size);
+pipe_handle_t hcd_pipe_addr0_open(uint8_t core_id, tusb_speed_t speed, uint8_t hub_addr, uint8_t hub_port);
+
+pipe_handle_t hcd_pipe_control_open(uint8_t dev_addr, uint8_t max_packet_size);
+tusb_error_t  hcd_pipe_control_xfer(pipe_handle_t pipe_hdl, const tusb_std_request_t * const p_request, uint8_t data[]);
+pipe_handle_t hcd_pipe_open(uint8_t dev_addr, tusb_descriptor_endpoint_t* endpoint_desc);
 
 #if 0
 //tusb_error_t hcd_pipe_open(
@@ -83,7 +86,7 @@ tusb_error_t hcd_pipe_cancel()ATTR_WARN_UNUSED_RESULT;
 //--------------------------------------------------------------------+
 /// return the current connect status of roothub port
 bool hcd_port_connect_status(uint8_t core_id) ATTR_WARN_UNUSED_RESULT;
-tusb_speed_t hcd_port_speed_get(uint8_t core_id) ATTR_WARN_UNUSED_RESULT;
+tusb_speed_t hcd_port_speed(uint8_t core_id) ATTR_WARN_UNUSED_RESULT;
 
 #ifdef __cplusplus
  }
diff --git a/tinyusb/host/usbd_host.c b/tinyusb/host/usbd_host.c
index 657bb28be..b8445d2b8 100644
--- a/tinyusb/host/usbd_host.c
+++ b/tinyusb/host/usbd_host.c
@@ -56,6 +56,12 @@
 //--------------------------------------------------------------------+
 // INTERNAL OBJECT & FUNCTION DECLARATION
 //--------------------------------------------------------------------+
+struct {
+  tusb_speed_t speed;
+  uint8_t hub_addr;
+  uint8_t hub_port;
+} usbh_device_addr0[TUSB_CFG_HOST_CONTROLLER_NUM];
+
 STATIC_ usbh_device_info_t device_info_pool[TUSB_CFG_HOST_DEVICE_MAX];
 
 //--------------------------------------------------------------------+
@@ -81,31 +87,39 @@ void usbh_enumeration_task(void)
   usbh_enumerate_t enum_item;
   tusb_error_t error;
 
-  OSAL_TASK_LOOP
+  OSAL_TASK_LOOP_BEGIN
+
+  osal_queue_receive(enum_queue_hdl, (uint32_t*)&enum_item, OSAL_TIMEOUT_NORMAL, &error);
+  TASK_ASSERT_STATUS(error);
+
+  if (enum_item.hub_address == 0) // direct connection
   {
-    OSAL_TASK_LOOP_BEGIN
-
-    osal_queue_receive(enum_queue_hdl, (uint32_t*)&enum_item, OSAL_TIMEOUT_NORMAL, &error);
-    if (error != TUSB_ERROR_NONE)
+    if ( enum_item.connect_status == hcd_port_connect_status(enum_item.core_id) ) // there chances the event is out-dated
     {
-      ASSERT_STATEMENT("%s", TUSB_ErrorStr[error]);
-    }
-    else
-    {
-      if (enum_item.hub_address == 0) // direct connection
+      tusb_std_request_t request_dev_desc =
       {
-        if ( enum_item.connect_status == hcd_port_connect_status(enum_item.core_id) ) // there chances the event is out-dated
-        {
+          .bmRequestType =
+          {
+              .direction = TUSB_DIR_DEV_TO_HOST,
+              .type      = TUSB_REQUEST_TYPE_STANDARD,
+              .recipient = TUSB_REQUEST_RECIPIENT_DEVICE
+          },
 
-        }
-      }else // device connect via a hub
-      {
-        ASSERT_STATEMENT("%s", "Hub is not supported yet");
-      }
+          .bRequest = TUSB_REQUEST_GET_DESCRIPTOR,
+          .wValue   = (TUSB_DESC_DEVICE << 8),
+          .wLength  = 8
+      };
+      tusb_speed_t speed = hcd_port_speed(enum_item.core_id);
+      pipe_handle_t pipe_addr0 = hcd_pipe_addr0_open(enum_item.core_id, speed, enum_item.hub_address, enum_item.hub_port);
+
+      //        hcd_pipe_control_xfer(pipe_addr0, &request_dev_desc)
     }
-
-    OSAL_TASK_LOOP_END
+  }else // device connect via a hub
+  {
+    ASSERT_MESSAGE("%s", "Hub is not supported yet");
   }
+
+  OSAL_TASK_LOOP_END
 }
 
 //--------------------------------------------------------------------+
diff --git a/tinyusb/host/usbd_host.h b/tinyusb/host/usbd_host.h
index 73a40f16b..9c02378dd 100644
--- a/tinyusb/host/usbd_host.h
+++ b/tinyusb/host/usbd_host.h
@@ -110,16 +110,21 @@ enum {
 typedef uint8_t  tusbh_device_status_t;
 typedef uint32_t tusbh_flag_class_t;
 
-typedef struct { // TODO internal structure
+typedef struct { // TODO internal structure, re-order members
   uint8_t core_id;
-  tusbh_device_status_t status;
-  pipe_handle_t pipe_control;
+  tusb_speed_t speed;
+  uint8_t hub_addr;
+  uint8_t hub_port;
 
-#if 0 // TODO allow configure for vendor/product
   uint16_t vendor_id;
   uint16_t product_id;
-
   uint8_t configure_count;
+
+  tusbh_device_status_t status;
+  pipe_handle_t pipe_control;
+  tusb_std_request_t request_control;
+
+#if 0 // TODO allow configure for vendor/product
   struct {
     uint8_t interface_count;
     uint8_t attributes;
diff --git a/tinyusb/osal/osal.h b/tinyusb/osal/osal.h
index 298a54f3e..707a74bff 100644
--- a/tinyusb/osal/osal.h
+++ b/tinyusb/osal/osal.h
@@ -82,9 +82,12 @@ typedef uint32_t osal_task_t;
 #define OSAL_TASK_DEF(name, code, stack_depth, prio) \
     osal_task_t name
 
-#define OSAL_TASK_LOOP
 #define OSAL_TASK_LOOP_BEGIN
 #define OSAL_TASK_LOOP_END
+#define TASK_ASSERT_STATUS(sts) \
+    ASSERT_DEFINE(tusb_error_t status = (tusb_error_t)(sts),\
+                  TUSB_ERROR_NONE == status, (void) 0, "%s", TUSB_ErrorStr[status])
+
 
 tusb_error_t osal_task_create(osal_task_t *task);
 
diff --git a/tinyusb/osal/osal_none.h b/tinyusb/osal/osal_none.h
index 56277d90c..682f60efa 100644
--- a/tinyusb/osal/osal_none.h
+++ b/tinyusb/osal/osal_none.h
@@ -79,18 +79,31 @@ uint32_t osal_tick_get(void);
 //--------------------------------------------------------------------+
 //#define osal_task_create(code, name, stack_depth, parameters, prio)
 
-#define OSAL_TASK_LOOP  \
+#define OSAL_TASK_LOOP_BEGIN \
   static uint32_t timeout = 0;\
   static uint16_t state = 0;\
-  switch(state)\
-
-#define OSAL_TASK_LOOP_BEGIN \
-  case 0:
+  switch(state) {\
+    case 0:\
 
 #define OSAL_TASK_LOOP_END \
   default:\
-    state = 0;
+    state = 0;\
+  }
 
+#define TASK_ASSERT_DEFINE(setup_statement, condition, error, format, ...) \
+  do{\
+    setup_statement;\
+	  if (!(condition)) {\
+	    ASSERT_MESSAGE(format, __VA_ARGS__);\
+	    state = 0; /* reset task loop */\
+	    break;\
+	  }\
+	}while(0)
+
+#define TASK_ASSERT(condition, error)  TASK_ASSERT_DEFINE( , (condition), error, "%s", "evaluated to false")
+#define TASK_ASSERT_STATUS(sts) \
+    TASK_ASSERT_DEFINE(tusb_error_t status = (tusb_error_t)(sts),\
+                  TUSB_ERROR_NONE == status, status, "%s", TUSB_ErrorStr[status])
 //--------------------------------------------------------------------+
 // Semaphore API
 //--------------------------------------------------------------------+