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diff --git a/src/device/usbd_pvt.h b/src/device/usbd_pvt.h
new file mode 100644
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+++ b/src/device/usbd_pvt.h
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+/**************************************************************************/
+/*!
+    @file     usbd_pvt.h
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, hathach (tinyusb.org)
+    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. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''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 COPYRIGHT HOLDER 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 tinyusb stack.
+*/
+/**************************************************************************/
+#ifndef USBD_PVT_H_
+#define USBD_PVT_H_
+
+#include "osal/osal.h"
+#include "common/tusb_fifo.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+// Either point to tud_desc_set or usbd_auto_desc_set depending on CFG_TUD_DESC_AUTO
+extern tud_desc_set_t const* usbd_desc_set;
+
+//--------------------------------------------------------------------+
+// INTERNAL API for stack management
+//--------------------------------------------------------------------+
+bool usbd_init (void);
+void usbd_task (void* param);
+
+
+// Carry out Data and Status stage of control transfer
+// - If len = 0, it is equivalent to sending status only
+// - If len > wLength : it will be truncated
+bool usbd_control_xfer(uint8_t rhport, tusb_control_request_t const * request, void* buffer, uint16_t len);
+
+// Send STATUS (zero length) packet
+bool usbd_control_status(uint8_t rhport, tusb_control_request_t const * request);
+
+// Stall control endpoint until new setup packet arrived
+void usbd_control_stall(uint8_t rhport);
+
+/*------------------------------------------------------------------*/
+/* Helper
+ *------------------------------------------------------------------*/
+// helper to parse an pair of In and Out endpoint descriptors. They must be consecutive
+bool usbd_open_edpt_pair(uint8_t rhport, tusb_desc_endpoint_t const* p_desc_ep, uint8_t xfer_type, uint8_t* ep_out, uint8_t* ep_in);
+
+void usbd_defer_func( osal_task_func_t func, void* param, bool in_isr );
+
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* USBD_PVT_H_ */