/* * 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; }