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diff --git a/src/common/tusb_txbuf.h b/src/common/tusb_txbuf.h
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+++ b/src/common/tusb_txbuf.h
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+/**************************************************************************/
+/*!
+    @file     tusb_txbuf.h
+    @author   Scott Shawcroft
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, Scott Shawcroft
+    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.
+*/
+/**************************************************************************/
+
+/** \ingroup Group_Common
+ * \defgroup group_txbuf txbuf
+ *  @{ */
+
+#ifndef _TUSB_TXBUF_H_
+#define _TUSB_TXBUF_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+typedef bool (*edpt_xfer) (uint8_t rhport, uint8_t ep_addr, uint8_t* buffer, uint16_t total_bytes);
+
+
+/** \struct tu_txbuf_t
+ * \brief Circular transmit buffer that manages USB transfer memory. It is not threadsafe and is
+ *        only meant for use in the main task.
+ */
+typedef struct
+{
+    uint8_t* buffer    ; ///< buffer pointer
+    uint16_t buf_len;
+    uint16_t first_free;
+    uint16_t pending_count;
+    uint16_t transmitting_count;
+    uint16_t padding;
+    uint8_t ep_addr;
+    edpt_xfer xfer;
+} tu_txbuf_t;
+
+bool tu_txbuf_clear(tu_txbuf_t *f);
+bool tu_txbuf_config(tu_txbuf_t *f, uint8_t* buffer, uint16_t depth, edpt_xfer xfer);
+
+uint16_t tu_txbuf_write_n (tu_txbuf_t* txbuf, uint8_t const * buffer, uint32_t length);
+void tu_txbuf_set_ep_addr(tu_txbuf_t* txbuf, uint8_t ep_addr);
+uint32_t tu_txbuf_transmit_done_cb(tu_txbuf_t* buf, uint32_t bufsize);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_TXBUF_H_ */