diff --git a/src/common/tusb_common.h b/src/common/tusb_common.h
new file mode 100644
index 0000000..9b9e2b0
--- /dev/null
+++ b/src/common/tusb_common.h
@@ -0,0 +1,406 @@
+/*
+ * 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_COMMON_H_
+#define _TUSB_COMMON_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Macros Helper
+//--------------------------------------------------------------------+
+#define TU_ARRAY_SIZE(_arr)   ( sizeof(_arr) / sizeof(_arr[0]) )
+#define TU_MIN(_x, _y)        ( ( (_x) < (_y) ) ? (_x) : (_y) )
+#define TU_MAX(_x, _y)        ( ( (_x) > (_y) ) ? (_x) : (_y) )
+
+#define TU_U16_HIGH(_u16)     ((uint8_t) (((_u16) >> 8) & 0x00ff))
+#define TU_U16_LOW(_u16)      ((uint8_t) ((_u16)       & 0x00ff))
+#define U16_TO_U8S_BE(_u16)   TU_U16_HIGH(_u16), TU_U16_LOW(_u16)
+#define U16_TO_U8S_LE(_u16)   TU_U16_LOW(_u16), TU_U16_HIGH(_u16)
+
+#define TU_U32_BYTE3(_u32)    ((uint8_t) ((((uint32_t) _u32) >> 24) & 0x000000ff)) // MSB
+#define TU_U32_BYTE2(_u32)    ((uint8_t) ((((uint32_t) _u32) >> 16) & 0x000000ff))
+#define TU_U32_BYTE1(_u32)    ((uint8_t) ((((uint32_t) _u32) >>  8) & 0x000000ff))
+#define TU_U32_BYTE0(_u32)    ((uint8_t) (((uint32_t)  _u32)        & 0x000000ff)) // LSB
+
+#define U32_TO_U8S_BE(_u32)   TU_U32_BYTE3(_u32), TU_U32_BYTE2(_u32), TU_U32_BYTE1(_u32), TU_U32_BYTE0(_u32)
+#define U32_TO_U8S_LE(_u32)   TU_U32_BYTE0(_u32), TU_U32_BYTE1(_u32), TU_U32_BYTE2(_u32), TU_U32_BYTE3(_u32)
+
+#define TU_BIT(n)             (1UL << (n))
+#define TU_GENMASK(h, l)      ( (UINT32_MAX << (l)) & (UINT32_MAX >> (31 - (h))) )
+
+//--------------------------------------------------------------------+
+// Includes
+//--------------------------------------------------------------------+
+
+// Standard Headers
+#include <stdbool.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdio.h>
+
+// Tinyusb Common Headers
+#include "tusb_option.h"
+#include "tusb_compiler.h"
+#include "tusb_verify.h"
+#include "tusb_types.h"
+
+#include "tusb_error.h"   // TODO remove
+#include "tusb_timeout.h" // TODO remove
+
+//--------------------------------------------------------------------+
+// Internal Helper used by Host and Device Stack
+//--------------------------------------------------------------------+
+
+// Check if endpoint descriptor is valid per USB specs
+bool tu_edpt_validate(tusb_desc_endpoint_t const * desc_ep, tusb_speed_t speed);
+
+// Bind all endpoint of a interface descriptor to class driver
+void tu_edpt_bind_driver(uint8_t ep2drv[][2], tusb_desc_interface_t const* p_desc, uint16_t desc_len, uint8_t driver_id);
+
+// Calculate total length of n interfaces (depending on IAD)
+uint16_t tu_desc_get_interface_total_len(tusb_desc_interface_t const* desc_itf, uint8_t itf_count, uint16_t max_len);
+
+//--------------------------------------------------------------------+
+// Internal Inline Functions
+//--------------------------------------------------------------------+
+
+//------------- Mem -------------//
+#define tu_memclr(buffer, size)  memset((buffer), 0, (size))
+#define tu_varclr(_var)          tu_memclr(_var, sizeof(*(_var)))
+
+//------------- Bytes -------------//
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_u32(uint8_t b3, uint8_t b2, uint8_t b1, uint8_t b0)
+{
+  return ( ((uint32_t) b3) << 24) | ( ((uint32_t) b2) << 16) | ( ((uint32_t) b1) << 8) | b0;
+}
+
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_u16(uint8_t high, uint8_t low)
+{
+  return (uint16_t) ((((uint16_t) high) << 8) | low);
+}
+
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_u32_byte3(uint32_t ui32) { return TU_U32_BYTE3(ui32); }
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_u32_byte2(uint32_t ui32) { return TU_U32_BYTE2(ui32); }
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_u32_byte1(uint32_t ui32) { return TU_U32_BYTE1(ui32); }
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_u32_byte0(uint32_t ui32) { return TU_U32_BYTE0(ui32); }
+
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_u32_high16(uint32_t ui32) { return (uint16_t) (ui32 >> 16); }
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_u32_low16 (uint32_t ui32) { return (uint16_t) (ui32 & 0x0000ffffu); }
+
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_u16_high(uint16_t ui16) { return TU_U16_HIGH(ui16); }
+TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_u16_low (uint16_t ui16) { return TU_U16_LOW(ui16); }
+
+//------------- Bits -------------//
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_bit_set  (uint32_t value, uint8_t pos) { return value | TU_BIT(pos);                  }
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_bit_clear(uint32_t value, uint8_t pos) { return value & (~TU_BIT(pos));               }
+TU_ATTR_ALWAYS_INLINE static inline bool     tu_bit_test (uint32_t value, uint8_t pos) { return (value & TU_BIT(pos)) ? true : false; }
+
+//------------- Min -------------//
+TU_ATTR_ALWAYS_INLINE static inline uint8_t  tu_min8  (uint8_t  x, uint8_t y ) { return (x < y) ? x : y; }
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_min16 (uint16_t x, uint16_t y) { return (x < y) ? x : y; }
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_min32 (uint32_t x, uint32_t y) { return (x < y) ? x : y; }
+
+//------------- Max -------------//
+TU_ATTR_ALWAYS_INLINE static inline uint8_t  tu_max8  (uint8_t  x, uint8_t y ) { return (x > y) ? x : y; }
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_max16 (uint16_t x, uint16_t y) { return (x > y) ? x : y; }
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_max32 (uint32_t x, uint32_t y) { return (x > y) ? x : y; }
+
+//------------- Align -------------//
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_align(uint32_t value, uint32_t alignment)
+{
+  return value & ((uint32_t) ~(alignment-1));
+}
+
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_align16 (uint32_t value) { return (value & 0xFFFFFFF0UL); }
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_align32 (uint32_t value) { return (value & 0xFFFFFFE0UL); }
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_align4k (uint32_t value) { return (value & 0xFFFFF000UL); }
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_offset4k(uint32_t value) { return (value & 0xFFFUL); }
+
+//------------- Mathematics -------------//
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_div_ceil(uint32_t v, uint32_t d) { return (v + d -1)/d; }
+
+/// inclusive range checking TODO remove
+TU_ATTR_ALWAYS_INLINE static inline bool tu_within(uint32_t lower, uint32_t value, uint32_t upper)
+{
+  return (lower <= value) && (value <= upper);
+}
+
+// log2 of a value is its MSB's position
+// TODO use clz TODO remove
+static inline uint8_t tu_log2(uint32_t value)
+{
+  uint8_t result = 0;
+  while (value >>= 1) { result++; }
+  return result;
+}
+
+//------------- Unaligned Access -------------//
+#if TUP_ARCH_STRICT_ALIGN
+
+// Rely on compiler to generate correct code for unaligned access
+typedef struct { uint16_t val; } TU_ATTR_PACKED tu_unaligned_uint16_t;
+typedef struct { uint32_t val; } TU_ATTR_PACKED tu_unaligned_uint32_t;
+
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_unaligned_read32(const void* mem)
+{
+  tu_unaligned_uint32_t const* ua32 = (tu_unaligned_uint32_t const*) mem;
+  return ua32->val;
+}
+
+TU_ATTR_ALWAYS_INLINE static inline void tu_unaligned_write32(void* mem, uint32_t value)
+{
+  tu_unaligned_uint32_t* ua32 = (tu_unaligned_uint32_t*) mem;
+  ua32->val = value;
+}
+
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_unaligned_read16(const void* mem)
+{
+  tu_unaligned_uint16_t const* ua16 = (tu_unaligned_uint16_t const*) mem;
+  return ua16->val;
+}
+
+TU_ATTR_ALWAYS_INLINE static inline void tu_unaligned_write16(void* mem, uint16_t value)
+{
+  tu_unaligned_uint16_t* ua16 = (tu_unaligned_uint16_t*) mem;
+  ua16->val = value;
+}
+
+#elif TUP_MCU_STRICT_ALIGN
+
+// MCU such as LPC_IP3511 Highspeed cannot access unaligned memory on USB_RAM although it is ARM M4.
+// We have to manually pick up bytes since tu_unaligned_uint32_t will still generate unaligned code
+// NOTE: volatile cast to memory to prevent compiler to optimize and generate unaligned code
+// TODO Big Endian may need minor changes
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_unaligned_read32(const void* mem)
+{
+  volatile uint8_t const* buf8 = (uint8_t const*) mem;
+  return tu_u32(buf8[3], buf8[2], buf8[1], buf8[0]);
+}
+
+TU_ATTR_ALWAYS_INLINE static inline void tu_unaligned_write32(void* mem, uint32_t value)
+{
+  volatile uint8_t* buf8 = (uint8_t*) mem;
+  buf8[0] = tu_u32_byte0(value);
+  buf8[1] = tu_u32_byte1(value);
+  buf8[2] = tu_u32_byte2(value);
+  buf8[3] = tu_u32_byte3(value);
+}
+
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_unaligned_read16(const void* mem)
+{
+  volatile uint8_t const* buf8 = (uint8_t const*) mem;
+  return tu_u16(buf8[1], buf8[0]);
+}
+
+TU_ATTR_ALWAYS_INLINE static inline void tu_unaligned_write16(void* mem, uint16_t value)
+{
+  volatile uint8_t* buf8 = (uint8_t*) mem;
+  buf8[0] = tu_u16_low(value);
+  buf8[1] = tu_u16_high(value);
+}
+
+
+#else
+
+// MCU that could access unaligned memory natively
+TU_ATTR_ALWAYS_INLINE static inline uint32_t tu_unaligned_read32  (const void* mem) { return *((uint32_t const *) mem); }
+TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_unaligned_read16  (const void* mem) { return *((uint16_t const *) mem); }
+
+TU_ATTR_ALWAYS_INLINE static inline void     tu_unaligned_write32 (void* mem, uint32_t value ) { *((uint32_t*) mem) = value; }
+TU_ATTR_ALWAYS_INLINE static inline void     tu_unaligned_write16 (void* mem, uint16_t value ) { *((uint16_t*) mem) = value; }
+
+#endif
+
+// To be removed
+//------------- Binary constant -------------//
+#if defined(__GNUC__) && !defined(__CC_ARM)
+
+#define TU_BIN8(x)               ((uint8_t)  (0b##x))
+#define TU_BIN16(b1, b2)         ((uint16_t) (0b##b1##b2))
+#define TU_BIN32(b1, b2, b3, b4) ((uint32_t) (0b##b1##b2##b3##b4))
+
+#else
+
+//  internal macro of B8, B16, B32
+#define _B8__(x) (((x&0x0000000FUL)?1:0) \
+                +((x&0x000000F0UL)?2:0) \
+                +((x&0x00000F00UL)?4:0) \
+                +((x&0x0000F000UL)?8:0) \
+                +((x&0x000F0000UL)?16:0) \
+                +((x&0x00F00000UL)?32:0) \
+                +((x&0x0F000000UL)?64:0) \
+                +((x&0xF0000000UL)?128:0))
+
+#define TU_BIN8(d) ((uint8_t) _B8__(0x##d##UL))
+#define TU_BIN16(dmsb,dlsb) (((uint16_t)TU_BIN8(dmsb)<<8) + TU_BIN8(dlsb))
+#define TU_BIN32(dmsb,db2,db3,dlsb) \
+            (((uint32_t)TU_BIN8(dmsb)<<24) \
+            + ((uint32_t)TU_BIN8(db2)<<16) \
+            + ((uint32_t)TU_BIN8(db3)<<8) \
+            + TU_BIN8(dlsb))
+#endif
+
+//--------------------------------------------------------------------+
+// Debug Function
+//--------------------------------------------------------------------+
+
+// CFG_TUSB_DEBUG for debugging
+// 0 : no debug
+// 1 : print error
+// 2 : print warning
+// 3 : print info
+#if CFG_TUSB_DEBUG
+
+void tu_print_mem(void const *buf, uint32_t count, uint8_t indent);
+
+#ifdef CFG_TUSB_DEBUG_PRINTF
+  extern int CFG_TUSB_DEBUG_PRINTF(const char *format, ...);
+  #define tu_printf    CFG_TUSB_DEBUG_PRINTF
+#else
+  #define tu_printf    printf
+#endif
+
+static inline
+void tu_print_var(uint8_t const* buf, uint32_t bufsize)
+{
+  for(uint32_t i=0; i<bufsize; i++) tu_printf("%02X ", buf[i]);
+}
+
+// Log with Level
+#define TU_LOG(n, ...)        TU_XSTRCAT(TU_LOG, n)(__VA_ARGS__)
+#define TU_LOG_MEM(n, ...)    TU_XSTRCAT3(TU_LOG, n, _MEM)(__VA_ARGS__)
+#define TU_LOG_VAR(n, ...)    TU_XSTRCAT3(TU_LOG, n, _VAR)(__VA_ARGS__)
+#define TU_LOG_INT(n, ...)    TU_XSTRCAT3(TU_LOG, n, _INT)(__VA_ARGS__)
+#define TU_LOG_HEX(n, ...)    TU_XSTRCAT3(TU_LOG, n, _HEX)(__VA_ARGS__)
+#define TU_LOG_LOCATION()     tu_printf("%s: %d:\r\n", __PRETTY_FUNCTION__, __LINE__)
+#define TU_LOG_FAILED()       tu_printf("%s: %d: Failed\r\n", __PRETTY_FUNCTION__, __LINE__)
+
+// Log Level 1: Error
+#define TU_LOG1               tu_printf
+#define TU_LOG1_MEM           tu_print_mem
+#define TU_LOG1_VAR(_x)       tu_print_var((uint8_t const*)(_x), sizeof(*(_x)))
+#define TU_LOG1_INT(_x)       tu_printf(#_x " = %ld\r\n", (unsigned long) (_x) )
+#define TU_LOG1_HEX(_x)       tu_printf(#_x " = %lX\r\n", (unsigned long) (_x) )
+
+// Log Level 2: Warn
+#if CFG_TUSB_DEBUG >= 2
+  #define TU_LOG2             TU_LOG1
+  #define TU_LOG2_MEM         TU_LOG1_MEM
+  #define TU_LOG2_VAR         TU_LOG1_VAR
+  #define TU_LOG2_INT         TU_LOG1_INT
+  #define TU_LOG2_HEX         TU_LOG1_HEX
+#endif
+
+// Log Level 3: Info
+#if CFG_TUSB_DEBUG >= 3
+  #define TU_LOG3             TU_LOG1
+  #define TU_LOG3_MEM         TU_LOG1_MEM
+  #define TU_LOG3_VAR         TU_LOG1_VAR
+  #define TU_LOG3_INT         TU_LOG1_INT
+  #define TU_LOG3_HEX         TU_LOG1_HEX
+#endif
+
+typedef struct
+{
+  uint32_t key;
+  const char* data;
+} tu_lookup_entry_t;
+
+typedef struct
+{
+  uint16_t count;
+  tu_lookup_entry_t const* items;
+} tu_lookup_table_t;
+
+static inline const char* tu_lookup_find(tu_lookup_table_t const* p_table, uint32_t key)
+{
+  static char not_found[11];
+
+  for(uint16_t i=0; i<p_table->count; i++)
+  {
+    if (p_table->items[i].key == key) return p_table->items[i].data;
+  }
+
+  // not found return the key value in hex
+  sprintf(not_found, "0x%08lX", (unsigned long) key);
+
+  return not_found;
+}
+
+#endif // CFG_TUSB_DEBUG
+
+#ifndef TU_LOG
+#define TU_LOG(n, ...)
+#define TU_LOG_MEM(n, ...)
+#define TU_LOG_VAR(n, ...)
+#define TU_LOG_INT(n, ...)
+#define TU_LOG_HEX(n, ...)
+#define TU_LOG_LOCATION()
+#define TU_LOG_FAILED()
+#endif
+
+// TODO replace all TU_LOGn with TU_LOG(n)
+
+#define TU_LOG0(...)
+#define TU_LOG0_MEM(...)
+#define TU_LOG0_VAR(...)
+#define TU_LOG0_INT(...)
+#define TU_LOG0_HEX(...)
+
+
+#ifndef TU_LOG1
+  #define TU_LOG1(...)
+  #define TU_LOG1_MEM(...)
+  #define TU_LOG1_VAR(...)
+  #define TU_LOG1_INT(...)
+  #define TU_LOG1_HEX(...)
+#endif
+
+#ifndef TU_LOG2
+  #define TU_LOG2(...)
+  #define TU_LOG2_MEM(...)
+  #define TU_LOG2_VAR(...)
+  #define TU_LOG2_INT(...)
+  #define TU_LOG2_HEX(...)
+#endif
+
+#ifndef TU_LOG3
+  #define TU_LOG3(...)
+  #define TU_LOG3_MEM(...)
+  #define TU_LOG3_VAR(...)
+  #define TU_LOG3_INT(...)
+  #define TU_LOG3_HEX(...)
+#endif
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_COMMON_H_ */