1 /* 2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved. 3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this list of 9 * conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list 12 * of conditions and the following disclaimer in the documentation and/or other materials 13 * provided with the distribution. 14 * 15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used 16 * to endorse or promote products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LOS_TICK_PRI_H 33 #define _LOS_TICK_PRI_H 34 35 #include "los_base.h" 36 #include "los_tick.h" 37 #include "los_spinlock.h" 38 39 #ifdef __cplusplus 40 #if __cplusplus 41 extern "C" { 42 #endif /* __cplusplus */ 43 #endif /* __cplusplus */ 44 45 /** 46 * @ingroup los_tick 47 * Cycle to nanosecond scale 48 */ 49 extern DOUBLE g_cycle2NsScale; 50 51 /** 52 * @ingroup los_tick 53 * @brief Handle the system tick timeout. 54 * 55 * @par Description: 56 * This API is called when the system tick timeout and triggers the interrupt. 57 * 58 * @attention 59 * <ul> 60 * <li>None.</li> 61 * </ul> 62 * 63 * @param none. 64 * 65 * @retval None. 66 * @par Dependency: 67 * <ul><li>los_tick.h: the header file that contains the API declaration.</li></ul> 68 * @see None. 69 */ 70 extern VOID OsTickHandler(VOID); 71 72 /** 73 * @ingroup los_tick 74 * Convert from the cycle count to nanosecond. 75 */ 76 #define CYCLE_TO_NS(cycles) ((cycles) * g_cycle2NsScale) 77 78 /** 79 * Current system timer register is 32 bit, therefore TIMER_MAXLOAD define just in order to avoid ambiguity. 80 */ 81 #define TIMER_MAXLOAD 0xffffffff 82 83 #ifdef __cplusplus 84 #if __cplusplus 85 } 86 #endif /* __cplusplus */ 87 #endif /* __cplusplus */ 88 89 #endif /* _LOS_TICK_PRI_H */ 90