diff --git a/los_sys.c b/los_sys.c
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index 0000000..4235560
--- /dev/null
+++ b/los_sys.c
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+/*
+ * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2021 Huawei Device Co., Ltd. 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 holder 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 AND CONTRIBUTORS
+ * "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 OR
+ * CONTRIBUTORS 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.
+ */
+
+
+/*
+LOS_TickCountGet()：获取当前的系统节拍数。通过调用OsGetCurrSchedTimeCycle()函数获取当前调度时间周期，并将其除以每个节拍的周期数，得到节拍数。
+
+LOS_CyclePerTickGet()：获取每个节拍的周期数。通过将系统时钟频率除以每秒节拍数，得到每个节拍的周期数。
+
+LOS_MS2Tick()：将毫秒转换为节拍数。将给定的毫秒数乘以每秒节拍数，再除以每秒毫秒数，得到节拍数。
+
+LOS_Tick2MS()：将节拍数转换为毫秒。将给定的节拍数乘以每秒毫秒数，再除以每秒节拍数，得到毫秒数。
+
+OsNS2Tick()：将纳秒转换为节拍数。首先计算每个节拍的纳秒数，然后将给定的纳秒数加上每个节拍的纳秒数减1，再除以每个节拍的纳秒数，得到节拍数。如果节拍数超过最大值，则将其设置为最大值。
+*/
+
+#include "los_sys_pri.h"
+#include "los_sched_pri.h"
+
+ // 定义最大值
+#define OS_MAX_VALUE    0xFFFFFFFFUL
+
+// 获取当前的系统节拍数
+LITE_OS_SEC_TEXT_MINOR UINT64 LOS_TickCountGet(VOID)
+{
+    // 调用内部函数获取当前调度时间周期并除以每个节拍的周期数，得到节拍数
+    return OsGetCurrSchedTimeCycle() / OS_CYCLE_PER_TICK;
+}
+
+// 获取每个节拍的周期数
+LITE_OS_SEC_TEXT_MINOR UINT32 LOS_CyclePerTickGet(VOID)
+{
+    // 返回系统时钟频率除以每秒节拍数，得到每个节拍的周期数
+    return g_sysClock / LOSCFG_BASE_CORE_TICK_PER_SECOND;
+}
+
+// 将毫秒转换为节拍数
+LITE_OS_SEC_TEXT_MINOR UINT32 LOS_MS2Tick(UINT32 millisec)
+{
+    // 如果毫秒数等于最大值，直接返回最大值
+    if (millisec == OS_MAX_VALUE) {
+        return OS_MAX_VALUE;
+    }
+
+    // 将毫秒数乘以每秒节拍数，再除以每秒毫秒数，得到节拍数
+    return ((UINT64)millisec * LOSCFG_BASE_CORE_TICK_PER_SECOND) / OS_SYS_MS_PER_SECOND;
+}
+
+// 将节拍数转换为毫秒
+LITE_OS_SEC_TEXT_MINOR UINT32 LOS_Tick2MS(UINT32 tick)
+{
+    // 将节拍数乘以每秒毫秒数，再除以每秒节拍数，得到毫秒数
+    return ((UINT64)tick * OS_SYS_MS_PER_SECOND) / LOSCFG_BASE_CORE_TICK_PER_SECOND;
+}
+
+// 将纳秒转换为节拍数
+LITE_OS_SEC_TEXT_MINOR UINT32 OsNS2Tick(UINT64 nanoseconds)
+{
+    // 每个节拍的纳秒数
+    const UINT32 nsPerTick = OS_SYS_NS_PER_SECOND / LOSCFG_BASE_CORE_TICK_PER_SECOND;
+
+    // 将纳秒数加上每个节拍的纳秒数减1，再除以每个节拍的纳秒数，得到节拍数
+    UINT64 ticks = (nanoseconds + nsPerTick - 1) / nsPerTick;
+
+    // 如果节拍数超过最大值，将其设置为最大值
+    if (ticks > OS_MAX_VALUE) {
+        ticks = OS_MAX_VALUE;
+    }
+
+    // 将节拍数转换为32位整数并返回
+    return (UINT32)ticks;
+}
+
+
+
+