μC/OS-II---时间管理（os_time.c）

时间管理相关（os_time.c）

Task延迟

void  OSTimeDly (INT32U ticks)
{
	INT8U      y;
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register           */
	OS_CPU_SR  cpu_sr = 0u;
#endif
	
	if (OSIntNesting > 0u)                       /* See if trying to call from an ISR                  */
	{
		return;
	}
	
	if (OSLockNesting > 0u)                      /* See if called with scheduler locked                */
	{
		return;
	}
	
	if (ticks > 0u)                              /* 0 means no delay!                                  */
	{
		OS_ENTER_CRITICAL();
		y            =  OSTCBCur->OSTCBY;        /* Delay current task                                 */
		OSRdyTbl[y] &= (OS_PRIO)~OSTCBCur->OSTCBBitX;
		
		if (OSRdyTbl[y] == 0u)
		{
			OSRdyGrp &= (OS_PRIO)~OSTCBCur->OSTCBBitY;
		}
		
		OSTCBCur->OSTCBDly = ticks;              /* Load ticks in TCB                                  */
		OS_EXIT_CRITICAL();
		OS_Sched();                              /* Find next task to run!                             */
	}
}

按时、分、秒、毫秒延时

#if OS_TIME_DLY_HMSM_EN > 0u
INT8U  OSTimeDlyHMSM (INT8U   hours,
											INT8U   minutes,
											INT8U   seconds,
											INT16U  ms)
{
	INT32U ticks;
	
	if (OSIntNesting > 0u)                       /* See if trying to call from an ISR                  */
	{
		return (OS_ERR_TIME_DLY_ISR);
	}
	
	if (OSLockNesting > 0u)                      /* See if called with scheduler locked                */
	{
		return (OS_ERR_SCHED_LOCKED);
	}
	
#if OS_ARG_CHK_EN > 0u
	
	if (hours == 0u)
	{
		if (minutes == 0u)
		{
			if (seconds == 0u)
			{
				if (ms == 0u)
				{
					return (OS_ERR_TIME_ZERO_DLY);
				}
			}
		}
	}
	
	if (minutes > 59u)
	{
		return (OS_ERR_TIME_INVALID_MINUTES);    /* Validate arguments to be within range              */
	}
	
	if (seconds > 59u)
	{
		return (OS_ERR_TIME_INVALID_SECONDS);
	}
	
	if (ms > 999u)
	{
		return (OS_ERR_TIME_INVALID_MS);
	}
	
#endif
	/* Compute the total number of clock ticks required.. */
	/* .. (rounded to the nearest tick)                   */
	ticks = ((INT32U)hours * 3600uL + (INT32U)minutes * 60uL + (INT32U)seconds) * OS_TICKS_PER_SEC
					+ OS_TICKS_PER_SEC * ((INT32U)ms + 500uL / OS_TICKS_PER_SEC) / 1000uL;
	OSTimeDly (ticks);
	return (OS_ERR_NONE);
}
#endif

恢复被延时的Task

#if OS_TIME_DLY_RESUME_EN > 0u
INT8U  OSTimeDlyResume (INT8U prio)
{
	OS_TCB    *ptcb;
#if OS_CRITICAL_METHOD == 3u                                   /* Storage for CPU status register      */
	OS_CPU_SR  cpu_sr = 0u;
#endif
	
	if (prio >= OS_LOWEST_PRIO)
	{
		return (OS_ERR_PRIO_INVALID);
	}
	
	OS_ENTER_CRITICAL();
	ptcb = OSTCBPrioTbl[prio];                                 /* Make sure that task exist            */
	
	if (ptcb == (OS_TCB *)0)
	{
		OS_EXIT_CRITICAL();
		return (OS_ERR_TASK_NOT_EXIST);                        /* The task does not exist              */
	}
	
	if (ptcb == OS_TCB_RESERVED)
	{
		OS_EXIT_CRITICAL();
		return (OS_ERR_TASK_NOT_EXIST);                        /* The task does not exist              */
	}
	
	if (ptcb->OSTCBDly == 0u)                                  /* See if task is delayed               */
	{
		OS_EXIT_CRITICAL();
		return (OS_ERR_TIME_NOT_DLY);                          /* Indicate that task was not delayed   */
	}
	
	ptcb->OSTCBDly = 0u;                                       /* Clear the time delay                 */
	
	if ((ptcb->OSTCBStat & OS_STAT_PEND_ANY) != OS_STAT_RDY)
	{
		ptcb->OSTCBStat     &= ~OS_STAT_PEND_ANY;              /* Yes, Clear status flag               */
		ptcb->OSTCBStatPend  =  OS_STAT_PEND_TO;               /* Indicate PEND timeout                */
	}
	
	else
	{
		ptcb->OSTCBStatPend  =  OS_STAT_PEND_OK;
	}
	
	if ((ptcb->OSTCBStat & OS_STAT_SUSPEND) == OS_STAT_RDY)    /* Is task suspended?                   */
	{
		OSRdyGrp               |= ptcb->OSTCBBitY;             /* No,  Make ready                      */
		OSRdyTbl[ptcb->OSTCBY] |= ptcb->OSTCBBitX;
		OS_EXIT_CRITICAL();
		OS_Sched();                                            /* See if this is new highest priority  */
	}
	
	else
	{
		OS_EXIT_CRITICAL();                                    /* Task may be suspended                */
	}
	
	return (OS_ERR_NONE);
}
#endif

返回系统当前的Tick计数值

#if OS_TIME_GET_SET_EN > 0u
INT32U  OSTimeGet (void)
{
	INT32U     ticks;
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register           */
	OS_CPU_SR  cpu_sr = 0u;
#endif
	OS_ENTER_CRITICAL();
	ticks = OSTime;
	OS_EXIT_CRITICAL();
	return (ticks);
}
#endif

设置系统的Tick计数值

#if OS_TIME_GET_SET_EN > 0u
void  OSTimeSet (INT32U ticks)
{
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register           */
	OS_CPU_SR  cpu_sr = 0u;
#endif
	OS_ENTER_CRITICAL();
	OSTime = ticks;
	OS_EXIT_CRITICAL();
}
#endif