diff --git a/SConscript b/SConscript
new file mode 100644
index 000000000..b5043f437
--- /dev/null
+++ b/SConscript
@@ -0,0 +1,11 @@
+# RT-Thread building script for bridge
+
+import os
+from building import *
+
+objs = []
+cwd  = GetCurrentDir()
+
+objs = objs + SConscript(cwd + '/lib/rt-thread/SConscript')
+
+Return('objs')
diff --git a/lib/rt-thread/SConscript b/lib/rt-thread/SConscript
new file mode 100644
index 000000000..14fbf5549
--- /dev/null
+++ b/lib/rt-thread/SConscript
@@ -0,0 +1,42 @@
+import rtconfig
+from building import *
+
+cwd     = GetCurrentDir()
+src     = Split("""
+../../src/tusb.c
+../../src/common/tusb_fifo.c
+../../src/device/usbd.c
+../../src/device/usbd_control.c
+./tusb_rt_thread_port.c
+""")
+path = [cwd, cwd + "/../../src"]
+
+# BSP
+if GetDepend(["SOC_FAMILY_STM32"]):
+    src += ["../../src/portable/synopsys/dwc2/dcd_dwc2.c",
+            "../../src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c"]
+
+if GetDepend(["SOC_NRF52840"]):
+    src += ["../../src/portable/nordic/nrf5x/dcd_nrf5x.c"]
+
+if GetDepend(["SOC_FAMILY_RENESAS"]):
+    src += ["../../src/portable/renesas/rusb2/dcd_rusb2.c",
+            "../../src/portable/renesas/rusb2/rusb2_common.c"]
+
+# Device class
+if GetDepend(["PKG_TINYUSB_DEVICE_CDC"]):
+    src += ["../../src/class/cdc/cdc_device.c"]
+
+if GetDepend(["PKG_TINYUSB_DEVICE_MSC"]):
+    src += ["../../src/class/msc/msc_device.c", "port/msc_device_port.c"]
+
+LOCAL_CFLAGS = ''
+
+if rtconfig.PLATFORM == 'gcc' or rtconfig.PLATFORM == 'armclang': # GCC or Keil AC6
+    LOCAL_CFLAGS += ' -std=c99'
+elif rtconfig.PLATFORM == 'armcc': # Keil AC5
+    LOCAL_CFLAGS += ' --c99 --gnu'
+    
+group = DefineGroup('TinyUSB', src, depend = ['PKG_USING_TINYUSB'], CPPPATH = path, LOCAL_CFLAGS = LOCAL_CFLAGS)
+
+Return('group')
diff --git a/lib/rt-thread/port/msc_device_port.c b/lib/rt-thread/port/msc_device_port.c
new file mode 100644
index 000000000..6af3c4f61
--- /dev/null
+++ b/lib/rt-thread/port/msc_device_port.c
@@ -0,0 +1,171 @@
+/*
+ * 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.
+ */
+#ifdef __RTTHREAD__
+#include <tusb.h>
+#include <stdint.h>
+
+#include <board.h>
+#include <rtdevice.h>
+
+static bool ejected = false;
+static rt_device_t flash_device;
+static struct rt_device_blk_geometry blk_geom;
+
+#ifdef __CC_ARM
+uint16_t __builtin_bswap16(uint16_t x)
+{
+    return (x << 8) | (x >> 8);
+}
+#endif
+
+void tud_msc_inquiry_cb(uint8_t lun, uint8_t vendor_id[8], uint8_t product_id[16], uint8_t product_rev[4])
+{
+    (void) lun;
+
+    const char vid[] = PKG_TINYUSB_DEVICE_MSC_VID;
+    const char pid[] = PKG_TINYUSB_DEVICE_MSC_PID;
+    const char rev[] = PKG_TINYUSB_DEVICE_MSC_REV;
+
+    memcpy(vendor_id, vid, strlen(vid));
+    memcpy(product_id, pid, strlen(pid));
+    memcpy(product_rev, rev, strlen(rev));
+}
+
+bool tud_msc_test_unit_ready_cb(uint8_t lun)
+{
+    (void) lun;
+
+    if (ejected)
+    {
+        tud_msc_set_sense(lun, SCSI_SENSE_NOT_READY, 0x3a, 0x00);
+        return false;
+    }
+
+    if (flash_device == NULL)
+    {
+        flash_device = rt_device_find(PKG_TINYUSB_DEVICE_MSC_NAME);
+    }
+    if (flash_device != NULL)
+    {
+        static uint8_t open_flg = 0;
+        if (!open_flg)
+        {
+            open_flg = 1;
+            rt_device_open(flash_device, 0);
+        }
+
+        rt_device_control(flash_device, RT_DEVICE_CTRL_BLK_GETGEOME, &blk_geom);
+        return true;
+    }
+
+    return false;
+}
+
+void tud_msc_capacity_cb(uint8_t lun, uint32_t *block_count, uint16_t *block_size)
+{
+    (void) lun;
+
+    *block_count = blk_geom.sector_count;
+    *block_size  = blk_geom.bytes_per_sector;
+}
+
+bool tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject)
+{
+    (void) lun;
+    (void) power_condition;
+
+    if (load_eject)
+    {
+        if (start)
+        {
+            ejected = false;
+        } else {
+            // unload disk storage
+            ejected = true;
+        }
+    } 
+
+    return true;
+}
+
+int32_t tud_msc_read10_cb(uint8_t lun, uint32_t lba, uint32_t offset, void *buffer, uint32_t bufsize)
+{
+    (void) lun;
+    (void) offset;
+    (void) bufsize;
+
+    return (int32_t) rt_device_read(flash_device, (rt_off_t) lba, buffer, 1) * blk_geom.bytes_per_sector;
+}
+
+int32_t tud_msc_write10_cb(uint8_t lun, uint32_t lba, uint32_t offset, uint8_t *buffer, uint32_t bufsize)
+{
+    (void) lun;
+    (void) offset;
+    (void) bufsize;
+
+    return (int32_t) rt_device_write(flash_device, (rt_off_t) lba, buffer, 1) * blk_geom.bytes_per_sector;
+}
+
+int32_t tud_msc_scsi_cb(uint8_t lun, uint8_t const scsi_cmd[16], void *buffer, uint16_t bufsize)
+{
+    void const *response = NULL;
+    uint16_t resplen = 0;
+
+    // most scsi handled is input
+    bool in_xfer = true;
+
+    switch (scsi_cmd[0])
+    {
+        case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
+            // Host is about to read/write etc ... better not to disconnect disk
+            resplen = 0;
+            break;
+
+        default:
+            // Set Sense = Invalid Command Operation
+            tud_msc_set_sense(lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00);
+
+            // negative means error -> tinyusb could stall and/or response with failed status
+            resplen = -1;
+            break;
+    }
+
+    // return resplen must not larger than bufsize
+    if (resplen > bufsize) resplen = bufsize;
+
+    if (response && (resplen > 0))
+    {
+        if (in_xfer)
+        {
+            memcpy(buffer, response, resplen);
+        } else {
+            // SCSI output
+        }
+    }
+
+    return resplen;
+}
+#endif /*__RTTHREAD__*/
diff --git a/lib/rt-thread/tusb_config.h b/lib/rt-thread/tusb_config.h
new file mode 100644
index 000000000..8b145f3f7
--- /dev/null
+++ b/lib/rt-thread/tusb_config.h
@@ -0,0 +1,147 @@
+/*
+ * 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_CONFIG_H_
+#define _TUSB_CONFIG_H_
+
+#ifdef __RTTHREAD__
+#include <rtconfig.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//--------------------------------------------------------------------
+// COMMON CONFIGURATION
+//--------------------------------------------------------------------
+
+#if   defined(SOC_SERIES_STM32F0)
+#define CFG_TUSB_MCU    OPT_MCU_STM32F0
+#elif defined(SOC_SERIES_STM32F1)
+#define CFG_TUSB_MCU    OPT_MCU_STM32F1
+#elif defined(SOC_SERIES_STM32F2)
+#define CFG_TUSB_MCU    OPT_MCU_STM32F2
+#elif defined(SOC_SERIES_STM32F3)
+#define CFG_TUSB_MCU    OPT_MCU_STM32F3
+#elif defined(SOC_SERIES_STM32F4)
+#define CFG_TUSB_MCU    OPT_MCU_STM32F4
+#elif defined(SOC_SERIES_STM32F7)
+#define CFG_TUSB_MCU    OPT_MCU_STM32F7
+#elif defined(SOC_SERIES_STM32H7)
+#define CFG_TUSB_MCU    OPT_MCU_STM32H7
+#elif defined(SOC_SERIES_STM32L0)
+#define CFG_TUSB_MCU    OPT_MCU_STM32L0
+#elif defined(SOC_SERIES_STM32L1)
+#define CFG_TUSB_MCU    OPT_MCU_STM32L1
+#elif defined(SOC_SERIES_STM32L4)
+#define CFG_TUSB_MCU    OPT_MCU_STM32L4
+#elif defined(SOC_NRF52840)
+#define CFG_TUSB_MCU    OPT_MCU_NRF5X
+#elif defined(SOC_HPM6000)
+#define CFG_TUSB_MCU    OPT_MCU_HPM
+#elif defined(SOC_RP2040)
+#define CFG_TUSB_MCU    OPT_MCU_RP2040
+#elif defined(SOC_FAMILY_RENESAS)
+#define CFG_TUSB_MCU    OPT_MCU_RAXXX
+#else
+#error "Not support for current MCU"
+#endif
+
+#define CFG_TUSB_OS OPT_OS_RTTHREAD
+
+//--------------------------------------------------------------------
+// DEBUG CONFIGURATION
+//--------------------------------------------------------------------
+#ifdef CFG_TUSB_DEBUG
+#define CFG_TUSB_DEBUG_PRINTF rt_kprintf
+#endif /* CFG_TUSB_DEBUG */
+
+#ifndef BOARD_DEVICE_RHPORT_NUM
+#define BOARD_DEVICE_RHPORT_NUM     PKG_TINYUSB_RHPORT_NUM
+#endif
+
+#ifndef BOARD_DEVICE_RHPORT_SPEED
+#define BOARD_DEVICE_RHPORT_SPEED   PKG_TINYUSB_DEVICE_PORT_SPEED
+#endif
+
+#if   BOARD_DEVICE_RHPORT_NUM == 0
+#define CFG_TUSB_RHPORT0_MODE     (OPT_MODE_DEVICE | BOARD_DEVICE_RHPORT_SPEED)
+#elif BOARD_DEVICE_RHPORT_NUM == 1
+#define CFG_TUSB_RHPORT1_MODE     (OPT_MODE_DEVICE | BOARD_DEVICE_RHPORT_SPEED)
+#else
+  #error "Incorrect RHPort configuration"
+#endif
+
+/* USB DMA on some MCUs can only access a specific SRAM region with restriction on alignment.
+ * Tinyusb use follows macros to declare transferring memory so that they can be put
+ * into those specific section.
+ * e.g
+ * - CFG_TUSB_MEM SECTION : __attribute__ (( section(".usb_ram") ))
+ * - CFG_TUSB_MEM_ALIGN   : __attribute__ ((aligned(4)))
+ */
+#ifndef CFG_TUSB_MEM_SECTION
+#define CFG_TUSB_MEM_SECTION        rt_section(PKG_TINYUSB_MEM_SECTION)
+#endif
+
+#ifndef CFG_TUSB_MEM_ALIGN
+#define CFG_TUSB_MEM_ALIGN          rt_align(PKG_TINYUSB_MEM_ALIGN)
+#endif
+
+//--------------------------------------------------------------------
+// DEVICE CONFIGURATION
+//--------------------------------------------------------------------
+
+#ifndef CFG_TUD_ENDPOINT0_SIZE
+#define CFG_TUD_ENDPOINT0_SIZE        PKG_TINYUSB_EDPT0_SIZE
+#endif
+
+// CDC FIFO size of TX and RX
+#define CFG_TUD_CDC_RX_BUFSIZE        PKG_TINYUSB_DEVICE_CDC_RX_BUFSIZE
+#define CFG_TUD_CDC_TX_BUFSIZE        PKG_TINYUSB_DEVICE_CDC_TX_BUFSIZE
+
+#define CFG_TUD_MSC_EP_BUFSIZE        PKG_TINYUSB_DEVICE_MSC_EP_BUFSIZE
+
+#define CFG_TUD_HID_EP_BUFSIZE        PKG_TINYUSB_DEVICE_HID_EP_BUFSIZE
+
+#ifndef PKG_TINYUSB_DEVICE_CDC_STRING
+#define PKG_TINYUSB_DEVICE_CDC_STRING ""
+#endif
+
+#ifndef PKG_TINYUSB_DEVICE_MSC_STRING
+#define PKG_TINYUSB_DEVICE_MSC_STRING ""
+#endif
+
+#ifndef PKG_TINYUSB_DEVICE_HID_STRING
+#define PKG_TINYUSB_DEVICE_HID_STRING ""
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /*__RTTHREAD__*/
+
+#endif /* _TUSB_CONFIG_H_ */
diff --git a/lib/rt-thread/tusb_rt_thread_port.c b/lib/rt-thread/tusb_rt_thread_port.c
new file mode 100644
index 000000000..d33e3ac60
--- /dev/null
+++ b/lib/rt-thread/tusb_rt_thread_port.c
@@ -0,0 +1,81 @@
+/*
+ * 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.
+ */
+#ifdef __RTTHREAD__
+#include <rtthread.h>
+
+#define  DBG_TAG  "TinyUSB"
+#define  DBG_LVL  DBG_INFO
+#include <rtdbg.h>
+#include <tusb.h>
+
+#ifndef RT_USING_HEAP
+/* if there is not enable heap, we should use static thread and stack. */
+static rt_uint8_t tusb_stack[PKG_TINYUSB_STACK_SIZE];
+static struct rt_thread tusb_thread;
+#endif /* RT_USING_HEAP */
+
+extern int tusb_board_init(void);
+
+static void tusb_thread_entry(void *parameter)
+{
+    (void) parameter;
+    while (1)
+    {
+        tud_task();
+    }
+}
+
+static int init_tinyusb(void)
+{
+    rt_thread_t tid;
+
+    tusb_board_init();
+    tusb_init();
+
+#ifdef RT_USING_HEAP
+    tid = rt_thread_create("tusb", tusb_thread_entry, RT_NULL,
+                           PKG_TINYUSB_STACK_SIZE,
+                           PKG_TINYUSB_THREAD_PRIORITY, 10);
+    if (tid == RT_NULL)
+#else
+    rt_err_t result;
+
+    tid = &tusb_thread;
+    result = rt_thread_init(tid, "tusb", tusb_thread_entry, RT_NULL,
+                            tusb_stack, sizeof(tusb_stack), 4, 10);
+    if (result != RT_EOK)
+#endif /* RT_USING_HEAP */
+    {
+        LOG_E("Fail to create TinyUSB thread");
+        return -1;
+    }
+
+    rt_thread_startup(tid);
+
+    return 0;
+}
+INIT_APP_EXPORT(init_tinyusb);
+#endif /*__RTTHREAD__*/