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/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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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。
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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。
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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。
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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。
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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。
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*/
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#include "los_sys_pri.h"
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#include "los_sched_pri.h"
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// 定义最大值
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#define OS_MAX_VALUE 0xFFFFFFFFUL
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// 获取当前的系统节拍数
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LITE_OS_SEC_TEXT_MINOR UINT64 LOS_TickCountGet(VOID)
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{
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// 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
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return OsGetCurrSchedTimeCycle() / OS_CYCLE_PER_TICK;
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}
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// 获取每个节拍的周期数
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LITE_OS_SEC_TEXT_MINOR UINT32 LOS_CyclePerTickGet(VOID)
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{
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// 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
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return g_sysClock / LOSCFG_BASE_CORE_TICK_PER_SECOND;
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}
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// 将毫秒转换为节拍数
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LITE_OS_SEC_TEXT_MINOR UINT32 LOS_MS2Tick(UINT32 millisec)
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{
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// 如果毫秒数等于最大值，直接返回最大值
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if (millisec == OS_MAX_VALUE) {
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return OS_MAX_VALUE;
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}
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// 将毫秒数乘以每秒节拍数，再除以每秒毫秒数，得到节拍数
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return ((UINT64)millisec * LOSCFG_BASE_CORE_TICK_PER_SECOND) / OS_SYS_MS_PER_SECOND;
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}
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// 将节拍数转换为毫秒
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LITE_OS_SEC_TEXT_MINOR UINT32 LOS_Tick2MS(UINT32 tick)
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{
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// 将节拍数乘以每秒毫秒数，再除以每秒节拍数，得到毫秒数
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return ((UINT64)tick * OS_SYS_MS_PER_SECOND) / LOSCFG_BASE_CORE_TICK_PER_SECOND;
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}
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// 将纳秒转换为节拍数
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LITE_OS_SEC_TEXT_MINOR UINT32 OsNS2Tick(UINT64 nanoseconds)
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{
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// 每个节拍的纳秒数
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const UINT32 nsPerTick = OS_SYS_NS_PER_SECOND / LOSCFG_BASE_CORE_TICK_PER_SECOND;
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// 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
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UINT64 ticks = (nanoseconds + nsPerTick - 1) / nsPerTick;
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// 如果节拍数超过最大值，将其设置为最大值
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if (ticks > OS_MAX_VALUE) {
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ticks = OS_MAX_VALUE;
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}
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// 将节拍数转换为32位整数并返回
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return (UINT32)ticks;
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}
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