los_tick_pri.h

浏览该文件的文档.

/*
 * 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.
 */
 
#ifndef _LOS_TICK_PRI_H
#define _LOS_TICK_PRI_H
 
#include "los_base.h"
#include "los_tick.h"
#include "los_spinlock.h"
 
#ifdef __cplusplus
#if __cplusplus
extern "C" {
#endif /* __cplusplus */
#endif /* __cplusplus */
 
/**
 * @ingroup los_tick
 * Cycle to nanosecond scale
 */
extern DOUBLE g_cycle2NsScale;
 
/**
* @ingroup  los_tick
* @brief Handle the system tick timeout.
*
* @par Description:
* This API is called when the system tick timeout and triggers the interrupt.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @param none.
*
* @retval None.
* @par Dependency:
* <ul><li>los_tick.h: the header file that contains the API declaration.</li></ul>
* @see None.
*/
extern VOID OsTickHandler(VOID);
 
/**
 * @ingroup los_tick
 * Convert from the cycle count to nanosecond.
 */
#define CYCLE_TO_NS(cycles) ((cycles) * g_cycle2NsScale)
 
/**
 * Current system timer register is 32 bit, therefore TIMER_MAXLOAD define just in order to avoid ambiguity.
 */
#define TIMER_MAXLOAD 0xffffffff
 
#ifdef __cplusplus
#if __cplusplus
}
#endif /* __cplusplus */
#endif /* __cplusplus */
 
#endif /* _LOS_TICK_PRI_H */