Tick

Tick 的协作图:

函数
VOID	OsTickHandler (VOID)
	Handle the system tick timeout. 更多...
VOID	LOS_GetCpuCycle (UINT32 *puwCntHi, UINT32 *puwCntLo)
	Obtain system cycle count. 更多...
UINT64	LOS_CurrNanosec (VOID)
	Obtain system time in nanoseconds. 更多...
VOID	LOS_Udelay (UINT32 usecs)
	spinning-delay in microsecond (us). 更多...
VOID	LOS_Mdelay (UINT32 usecs)
	spinning-delay in millisecond (ms). 更多...

变量
DOUBLE	g_cycle2NsScale
	周期转纳秒级 更多...

详细描述

函数说明

LOS_CurrNanosec()

UINT64 LOS_CurrNanosec

(

VOID

)

Obtain system time in nanoseconds.

Description:

This API is used to obtain system time in nanoseconds.

注意

None.

参数

None.

返回值

UINT64

system time in nanoseconds.

Dependency:

• los_tick.h: the header file that contains the API declaration.

参见

Obtain system time in nanoseconds.

在文件 los_hw_tick.c 第 62 行定义.

{
    UINT64 cycle = HalClockGetCycles();
    return (cycle / g_sysClock) * OS_SYS_NS_PER_SECOND + (cycle % g_sysClock) * OS_SYS_NS_PER_SECOND / g_sysClock;
}

函数调用图:

这是这个函数的调用关系图:

LOS_GetCpuCycle()

VOID LOS_GetCpuCycle	(	UINT32 *	highCnt,
		UINT32 *	lowCnt
	)

Obtain system cycle count.

Description:

This API is used to obtain system cycle count.

注意

• This count is determined by the tick source.

参数

puwCntHi	[OUT] Type UINT32 Pointer to the higher 32bit of cycles to be obtained.
puwCntLo	[OUT] Type UINT32 Pointer to the lower 32bit of cycles to be obtained.

返回值

None.

Dependency:

• los_tick.h: the header file that contains the API declaration.

参见

Obtain system cycle count.

在文件 los_hw_tick.c 第 54 行定义.

{
    UINT64 cycle = HalClockGetCycles();
 
    *highCnt = cycle >> 32; /* 32: offset 32 bits and retain high bits */
    *lowCnt = cycle & 0xFFFFFFFFU;
}

函数调用图:

这是这个函数的调用关系图:

LOS_Mdelay()

VOID LOS_Mdelay

(

UINT32

msecs

)

spinning-delay in millisecond (ms).

Description:

This API is used to delay in millisecond.

注意

None.

参数

UINT32

millisecond needs to delay.

返回值

None.

Dependency:

• los_tick.h: the header file that contains the API declaration.

参见

spinning-delay in millisecond (ms).

在文件 los_hw_tick.c 第 73 行定义.

{
    HalDelayUs(msecs * 1000); /* 1000 : 1ms = 1000us */
}

函数调用图:

这是这个函数的调用关系图:

LOS_Udelay()

VOID LOS_Udelay

(

UINT32

usecs

)

spinning-delay in microsecond (us).

Description:

This API is used to delay in microsecond.

注意

None.

参数

UINT32

microsecond needs to delay.

返回值

None.

Dependency:

• los_tick.h: the header file that contains the API declaration.

参见

spinning-delay in microsecond (us).

在文件 los_hw_tick.c 第 68 行定义.

{
    HalDelayUs(usecs);
}

函数调用图:

OsTickHandler()

VOID OsTickHandler

(

VOID

)

Handle the system tick timeout.

Description:

This API is called when the system tick timeout and triggers the interrupt.

注意

• None.

参数

none.

返回值

None.

Dependency:

• los_tick.h: the header file that contains the API declaration.

参见

None.

在文件 los_tick.c 第 50 行定义.

{
#ifdef LOSCFG_SCHED_TICK_DEBUG 
    OsSchedDebugRecordData();
#endif
 
#ifdef LOSCFG_KERNEL_VDSO
    OsVdsoTimevalUpdate();//更新vdso数据页时间,vdso可以直接在用户进程空间绕过系统调用获取系统时间(例如:gettimeofday)
#endif
 
#ifdef LOSCFG_BASE_CORE_TICK_HW_TIME
    HalClockIrqClear(); /* diff from every platform */
#endif
 
    OsSchedTick();//由时钟发起的调度
}

函数调用图:

这是这个函数的调用关系图:

变量说明

g_cycle2NsScale

DOUBLE g_cycle2NsScale

extern

周期转纳秒级

Cycle to nanosecond scale

在文件 los_tick.c 第 42 行定义.