1、在 TI 的 BLE 协议栈 中，即 OSAL 中 获取当前 系统 tick 的方法如下
/*
* Read the system clock - returns milliseconds
*/
extern uint32 osal_GetSystemClock( void );
2、32位 的变量 用于表示 ms ,可以表示多少天那？关系如下：
2^32 ms =
4294967296 ms =
4294967.296 S =
71582.788266666666666666666666667 分钟 =
1193.0464711111111111111111111111 小时 =
49.71026962962962962962962962963 天
/****************************************************************************** @file OSAL_Timers.h @brief This file contains the OSAL Timer definition and manipulation functions. Group: WCS, BTS
Target Device: CC2540, CC2541 ****************************************************************************** Copyright (c) 2004-2016, Texas Instruments Incorporated
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Release Name: ble_sdk_1.4.2.2
Release Date: 2016-06-09 06:57:09
*****************************************************************************/ #ifndef OSAL_TIMERS_H
#define OSAL_TIMERS_H #ifdef __cplusplus
extern "C"
{
#endif /*********************************************************************
* INCLUDES
*/ /*********************************************************************
* MACROS
*/ /*********************************************************************
* CONSTANTS
* the unit is chosen such that the 320us tick equivalent can fit in
* 32 bits.
*/
#define OSAL_TIMERS_MAX_TIMEOUT 0x28f5c28e /* unit is ms*/ /*********************************************************************
* TYPEDEFS
*/ /*********************************************************************
* GLOBAL VARIABLES
*/ /*********************************************************************
* FUNCTIONS
*/ /*
* Initialization for the OSAL Timer System.
*/
extern void osalTimerInit( void ); /*
* Set a Timer
*/
extern uint8 osal_start_timerEx( uint8 task_id, uint16 event_id, uint32 timeout_value ); /*
* Set a timer that reloads itself.
*/
extern uint8 osal_start_reload_timer( uint8 taskID, uint16 event_id, uint32 timeout_value ); /*
* Stop a Timer
*/
extern uint8 osal_stop_timerEx( uint8 task_id, uint16 event_id ); /*
* Get the tick count of a Timer.
*/
extern uint32 osal_get_timeoutEx( uint8 task_id, uint16 event_id ); /*
* Simulated Timer Interrupt Service Routine
*/ extern void osal_timer_ISR( void ); /*
* Adjust timer tables
*/
extern void osal_adjust_timers( void ); /*
* Update timer tables
*/
extern void osalTimerUpdate( uint32 updateTime ); /*
* Count active timers
*/
extern uint8 osal_timer_num_active( void ); /*
* Set the hardware timer interrupts for sleep mode.
* These functions should only be called in OSAL_PwrMgr.c
*/
extern void osal_sleep_timers( void );
extern void osal_unsleep_timers( void ); /*
* Read the system clock - returns milliseconds
*/
extern uint32 osal_GetSystemClock( void ); /*
* Get the next OSAL timer expiration.
* This function should only be called in OSAL_PwrMgr.c
*/
extern uint32 osal_next_timeout( void ); /*********************************************************************
*********************************************************************/ #ifdef __cplusplus
}
#endif #endif /* OSAL_TIMERS_H */