diff --git a/src/osal/osal_rtthread.h b/src/osal/osal_rtthread.h
new file mode 100644
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--- /dev/null
+++ b/src/osal/osal_rtthread.h
@@ -0,0 +1,130 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 tfx2001 (2479727366@qq.com)
+ *
+ * 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_OSAL_RTTHREAD_H_
+#define _TUSB_OSAL_RTTHREAD_H_
+
+// RT-Thread Headers
+#include "rtthread.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// TASK API
+//--------------------------------------------------------------------+
+static inline void osal_task_delay(uint32_t msec) {
+  rt_thread_mdelay(msec);
+}
+
+//--------------------------------------------------------------------+
+// Semaphore API
+//--------------------------------------------------------------------+
+typedef struct rt_semaphore osal_semaphore_def_t;
+typedef rt_sem_t osal_semaphore_t;
+
+static inline osal_semaphore_t
+osal_semaphore_create(osal_semaphore_def_t *semdef) {
+    rt_sem_init(semdef, "tusb", 0, RT_IPC_FLAG_FIFO);
+    return semdef;
+}
+
+static inline bool osal_semaphore_post(osal_semaphore_t sem_hdl, bool in_isr) {
+    (void) in_isr;
+    return rt_sem_release(sem_hdl) == RT_EOK;
+}
+
+static inline bool osal_semaphore_wait(osal_semaphore_t sem_hdl, uint32_t msec) {
+    return rt_sem_take(sem_hdl, rt_tick_from_millisecond(msec)) == RT_EOK;
+}
+
+static inline void osal_semaphore_reset(osal_semaphore_t const sem_hdl) {
+    // TODO: implement
+}
+
+//--------------------------------------------------------------------+
+// MUTEX API (priority inheritance)
+//--------------------------------------------------------------------+
+typedef struct rt_mutex osal_mutex_def_t;
+typedef rt_mutex_t osal_mutex_t;
+
+static inline osal_mutex_t osal_mutex_create(osal_mutex_def_t *mdef) {
+    rt_mutex_init(mdef, "tusb", RT_IPC_FLAG_FIFO);
+    return mdef;
+}
+
+static inline bool osal_mutex_lock(osal_mutex_t mutex_hdl, uint32_t msec) {
+    return rt_mutex_take(mutex_hdl, rt_tick_from_millisecond(msec)) == RT_EOK;
+}
+
+static inline bool osal_mutex_unlock(osal_mutex_t mutex_hdl) {
+    return rt_mutex_release(mutex_hdl) == RT_EOK;
+}
+
+//--------------------------------------------------------------------+
+// QUEUE API
+//--------------------------------------------------------------------+
+
+// role device/host is used by OS NONE for mutex (disable usb isr) only
+#define OSAL_QUEUE_DEF(_role, _name, _depth, _type) \
+    static _type _name##_##buf[_depth]; \
+    osal_queue_def_t _name = { .depth = _depth, .item_sz = sizeof(_type), .buf = _name##_##buf };
+
+typedef struct {
+    uint16_t depth;
+    uint16_t item_sz;
+    void *buf;
+
+    struct rt_messagequeue sq;
+} osal_queue_def_t;
+
+typedef rt_mq_t osal_queue_t;
+
+static inline osal_queue_t osal_queue_create(osal_queue_def_t *qdef) {
+    rt_mq_init(&(qdef->sq), "tusb", qdef->buf, qdef->item_sz,
+               qdef->item_sz * qdef->depth, RT_IPC_FLAG_FIFO);
+    return &(qdef->sq);
+}
+
+static inline bool osal_queue_receive(osal_queue_t qhdl, void *data) {
+    return rt_mq_recv(qhdl, data, qhdl->msg_size, RT_WAITING_FOREVER) == RT_EOK;
+}
+
+static inline bool osal_queue_send(osal_queue_t qhdl, void const *data, bool in_isr) {
+    (void) in_isr;
+    return rt_mq_send(qhdl, (void *)data, qhdl->msg_size) == RT_EOK;
+}
+
+static inline bool osal_queue_empty(osal_queue_t qhdl) {
+    return (qhdl->entry) == 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _TUSB_OSAL_RTTHREAD_H_ */