os_time.c

lpc2368-keil环境下的ucos的移植例程

/*
*********************************************************************************************************
*   											 uC/OS-II
*   									   The Real-Time Kernel
*   										  TIME MANAGEMENT
*
*   					   (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL
*   										All Rights Reserved
*
* File : OS_TIME.C
* By   : Jean J. Labrosse
*********************************************************************************************************
*/

#ifndef  OS_MASTER_FILE
#include "..\APP\includes.h"
#endif

/*
*********************************************************************************************************
*   							 DELAY TASK 'n' TICKS   (n from 0 to 65535)
*
* Description: This function is called to delay execution of the currently running task until the
*   		   specified number of system ticks expires.  This, of course, directly equates to delaying
*   		   the current task for some time to expire.  No delay will result If the specified delay is
*   		   0.  If the specified delay is greater than 0 then, a context switch will result.
*
* Arguments  : ticks	 is the time delay that the task will be suspended in number of clock 'ticks'.
*   					 Note that by specifying 0, the task will not be delayed.
*
* Returns    : none
*********************************************************************************************************
*/

void OSTimeDly(INT16U ticks)
{
#if OS_CRITICAL_METHOD == 3 					 /* Allocate storage for CPU status register		   */
	OS_CPU_SR  cpu_sr;
#endif    


	if (ticks > 0)
	{
		/* 0 means no delay!		 */
		OS_ENTER_CRITICAL();
		if ((OSRdyTbl[OSTCBCur->OSTCBY] &= ~OSTCBCur->OSTCBBitX) == 0)
		{
			/* Delay current task   	 */
			OSRdyGrp &= ~OSTCBCur->OSTCBBitY;
		}
		OSTCBCur->OSTCBDly = ticks; 									  /* Load ticks in TCB  	   */
		OS_EXIT_CRITICAL();
		OS_Sched(); 													  /* Find next task to run!    */
	}
}
/*$PAGE*/
/*
*********************************************************************************************************
*   								  DELAY TASK FOR SPECIFIED TIME
*
* Description: This function is called to delay execution of the currently running task until some time
*   		   expires.  This call allows you to specify the delay time in HOURS, MINUTES, SECONDS and
*   		   MILLISECONDS instead of ticks.
*
* Arguments  : hours	 specifies the number of hours that the task will be delayed (max. is 255)
*   		   minutes   specifies the number of minutes (max. 59)
*   		   seconds   specifies the number of seconds (max. 59)
*   		   milli	 specifies the number of milliseconds (max. 999)
*
* Returns    : OS_NO_ERR
*   		   OS_TIME_INVALID_MINUTES
*   		   OS_TIME_INVALID_SECONDS
*   		   OS_TIME_INVALID_MS
*   		   OS_TIME_ZERO_DLY
*
* Note(s)    : The resolution on the milliseconds depends on the tick rate.  For example, you can't do
*   		   a 10 mS delay if the ticker interrupts every 100 mS.  In this case, the delay would be
*   		   set to 0.  The actual delay is rounded to the nearest tick.
*********************************************************************************************************
*/

#if OS_TIME_DLY_HMSM_EN > 0
INT8U OSTimeDlyHMSM(INT8U hours, INT8U minutes, INT8U seconds, INT16U milli)
{
	INT32U ticks;
	INT16U loops;


	if (hours > 0 || minutes > 0 || seconds > 0 || milli > 0)
	{
		if (minutes > 59)
		{
			return (OS_TIME_INVALID_MINUTES);    /* Validate arguments to be within range   		   */
		}
		if (seconds > 59)
		{
			return (OS_TIME_INVALID_SECONDS);
		}
		if (milli > 999)
		{
			return (OS_TIME_INVALID_MILLI);
		}
		/* Compute the total number of clock ticks required.. */
		/* .. (rounded to the nearest tick) 				  */
		ticks = ((INT32U) hours * 3600L + (INT32U) minutes * 60L + (INT32U) seconds) * OS_TICKS_PER_SEC + OS_TICKS_PER_SEC * ((INT32U) milli + 500L / OS_TICKS_PER_SEC) / 1000L;
		loops = (INT16U) (ticks / 65536L);  	  /* Compute the integral number of 65536 tick delays   */
		ticks = ticks % 65536L; 				 /* Obtain  the fractional number of ticks  		   */
		OSTimeDly((INT16U) ticks);
		while (loops > 0)
		{
			OSTimeDly(32768);
			OSTimeDly(32768);
			loops--;
		}
		return (OS_NO_ERR);
	}
	return (OS_TIME_ZERO_DLY);
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
*   									  RESUME A DELAYED TASK
*
* Description: This function is used resume a task that has been delayed through a call to either
*   		   OSTimeDly() or OSTimeDlyHMSM().  Note that you MUST NOT call this function to resume a
*   		   task that is waiting for an event with timeout.  This situation would make the task look
*   		   like a timeout occurred (unless you desire this effect).  Also, you cannot resume a task
*   		   that has called OSTimeDlyHMSM() with a combined time that exceeds 65535 clock ticks.  In
*   		   other words, if the clock tick runs at 100 Hz then, you will not be able to resume a
*   		   delayed task that called OSTimeDlyHMSM(0, 10, 55, 350) or higher.
*
*   			   (10 Minutes * 60 + 55 Seconds + 0.35) * 100 ticks/second.
*
* Arguments  : prio 	 specifies the priority of the task to resume
*
* Returns    : OS_NO_ERR				 Task has been resumed
*   		   OS_PRIO_INVALID  		 if the priority you specify is higher that the maximum allowed
*   									 (i.e. >= OS_LOWEST_PRIO)
*   		   OS_TIME_NOT_DLY  		 Task is not waiting for time to expire
*   		   OS_TASK_NOT_EXIST		 The desired task has not been created
*********************************************************************************************************
*/

#if OS_TIME_DLY_RESUME_EN > 0
INT8U OSTimeDlyResume(INT8U prio)
{
#if OS_CRITICAL_METHOD == 3 					 /* Allocate storage for CPU status register		   */
	OS_CPU_SR  cpu_sr;
#endif    
	OS_TCB    *ptcb;


	if (prio >= OS_LOWEST_PRIO)
	{
		return (OS_PRIO_INVALID);
	}
	OS_ENTER_CRITICAL();
	ptcb = (OS_TCB *) OSTCBPrioTbl[prio];   				/* Make sure that task exist				*/
	if (ptcb != (OS_TCB *) 0)
	{
		if (ptcb->OSTCBDly != 0)
		{
			/* See if task is delayed   				*/
			ptcb->OSTCBDly = 0; 						  /* Clear the time delay   				  */
			if ((ptcb->OSTCBStat & OS_STAT_SUSPEND) == OS_STAT_RDY)
			{
				/* See if task is ready to run  */
				OSRdyGrp |= ptcb->OSTCBBitY;			 /* Make task ready to run  	 */
				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_NO_ERR);
		}
		else
		{
			OS_EXIT_CRITICAL();
			return (OS_TIME_NOT_DLY);   				   /* Indicate that task was not delayed	   */
		}
	}
	OS_EXIT_CRITICAL();
	return (OS_TASK_NOT_EXIST); 						   /* The task does not exist   			   */
}
#endif    
/*$PAGE*/
/*
*********************************************************************************************************
*   									  GET CURRENT SYSTEM TIME
*
* Description: This function is used by your application to obtain the current value of the 32-bit
*   		   counter which keeps track of the number of clock ticks.
*
* Arguments  : none
*
* Returns    : The current value of OSTime
*********************************************************************************************************
*/

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


	OS_ENTER_CRITICAL();
	ticks = OSTime;
	OS_EXIT_CRITICAL();
	return (ticks);
}
#endif    

/*
*********************************************************************************************************
*   										 SET SYSTEM CLOCK
*
* Description: This function sets the 32-bit counter which keeps track of the number of clock ticks.
*
* Arguments  : ticks	  specifies the new value that OSTime needs to take.
*
* Returns    : none
*********************************************************************************************************
*/

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


	OS_ENTER_CRITICAL();
	OSTime = ticks;
	OS_EXIT_CRITICAL();
}
#endif