📄 os_core.lst
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571 *
572 * Returns : none
573 *
574 * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
575 *********************************************************************************************************
576 */
577 #if OS_EVENT_EN > 0
578 INT8U OS_EventTaskRdy (OS_EVENT *pevent, void *msg, INT8U msk) reentrant
579 {
580 1 OS_TCB *ptcb;
581 1 INT8U x;
582 1 INT8U y;
583 1 INT8U bitx;
584 1 INT8U bity;
585 1 INT8U prio;
586 1
587 1
588 1 y = OSUnMapTbl[pevent->OSEventGrp]; /* Find highest prio. task waiting for message */
589 1 bity = OSMapTbl[y];
590 1 x = OSUnMapTbl[pevent->OSEventTbl[y]];
591 1 bitx = OSMapTbl[x];
592 1 prio = (INT8U)((y << 3) + x); /* Find priority of task getting the msg */
593 1 if ((pevent->OSEventTbl[y] &= ~bitx) == 0x00) { /* Remove this task from the waiting list */
594 2 pevent->OSEventGrp &= ~bity; /* Clr group bit if this was only task pending */
595 2 }
596 1 ptcb = OSTCBPrioTbl[prio]; /* Point to this task's OS_TCB */
597 1 ptcb->OSTCBDly = 0; /* Prevent OSTimeTick() from readying task */
598 1 ptcb->OSTCBEventPtr = (OS_EVENT *)0; /* Unlink ECB from this task */
599 1 #if ((OS_Q_EN > 0) && (OS_MAX_QS > 0)) || (OS_MBOX_EN > 0)
ptcb->OSTCBMsg = msg; /* Send message directly to waiting task */
#else
602 1 msg = msg; /* Prevent compiler warning if not used */
603 1 #endif
604 1 ptcb->OSTCBStat &= ~msk; /* Clear bit associated with event type */
605 1 if (ptcb->OSTCBStat == OS_STAT_RDY) { /* See if task is ready (could be susp'd) */
606 2 OSRdyGrp |= bity; /* Put task in the ready to run list */
607 2 OSRdyTbl[y] |= bitx;
608 2 }
609 1 return (prio);
610 1 }
611 #endif
612 /*$PAGE*/
613 /*
614 *********************************************************************************************************
615 * MAKE TASK WAIT FOR EVENT TO OCCUR
616 *
617 * Description: This function is called by other uC/OS-II services to suspend a task because an event has
618 * not occurred.
619 *
620 * Arguments : pevent is a pointer to the event control block for which the task will be waiting for.
621 *
622 * Returns : none
623 *
C51 COMPILER V8.18 OS_CORE 11/30/2009 13:25:39 PAGE 12
624 * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
625 *********************************************************************************************************
626 */
627 #if OS_EVENT_EN > 0
628 void OS_EventTaskWait (OS_EVENT *pevent) reentrant
629 {
630 1 OSTCBCur->OSTCBEventPtr = pevent; /* Store pointer to event control block in TCB */
631 1 if ((OSRdyTbl[OSTCBCur->OSTCBY] &= ~OSTCBCur->OSTCBBitX) == 0x00) { /* Task no longer ready */
632 2 OSRdyGrp &= ~OSTCBCur->OSTCBBitY; /* Clear event grp bit if this was only task pending */
633 2 }
634 1 pevent->OSEventTbl[OSTCBCur->OSTCBY] |= OSTCBCur->OSTCBBitX; /* Put task in waiting list */
635 1 pevent->OSEventGrp |= OSTCBCur->OSTCBBitY;
636 1 }
637 #endif
638 /*$PAGE*/
639 /*
640 *********************************************************************************************************
641 * MAKE TASK READY TO RUN BASED ON EVENT TIMEOUT
642 *
643 * Description: This function is called by other uC/OS-II services to make a task ready to run because a
644 * timeout occurred.
645 *
646 * Arguments : pevent is a pointer to the event control block which is readying a task.
647 *
648 * Returns : none
649 *
650 * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
651 *********************************************************************************************************
652 */
653 #if OS_EVENT_EN > 0
654 void OS_EventTO (OS_EVENT *pevent) reentrant
655 {
656 1 if ((pevent->OSEventTbl[OSTCBCur->OSTCBY] &= ~OSTCBCur->OSTCBBitX) == 0x00) {
657 2 pevent->OSEventGrp &= ~OSTCBCur->OSTCBBitY;
658 2 }
659 1 OSTCBCur->OSTCBStat = OS_STAT_RDY; /* Set status to ready */
660 1 OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0; /* No longer waiting for event */
661 1 }
662 #endif
663 /*$PAGE*/
664 /*
665 *********************************************************************************************************
666 * INITIALIZE EVENT CONTROL BLOCK'S WAIT LIST
667 *
668 * Description: This function is called by other uC/OS-II services to initialize the event wait list.
669 *
670 * Arguments : pevent is a pointer to the event control block allocated to the event.
671 *
672 * Returns : none
673 *
674 * Note : This function is INTERNAL to uC/OS-II and your application should not call it.
675 *********************************************************************************************************
676 */
677 #if ((OS_Q_EN > 0) && (OS_MAX_QS > 0)) || (OS_MBOX_EN > 0) || (OS_SEM_EN > 0) || (OS_MUTEX_EN > 0)
678 void OS_EventWaitListInit (OS_EVENT *pevent) reentrant
679 {
680 1 INT8U *ptbl;
681 1
682 1
683 1 pevent->OSEventGrp = 0x00; /* No task waiting on event */
684 1 ptbl = &pevent->OSEventTbl[0];
685 1
C51 COMPILER V8.18 OS_CORE 11/30/2009 13:25:39 PAGE 13
686 1 #if OS_EVENT_TBL_SIZE > 0
687 1 *ptbl++ = 0x00;
688 1 #endif
689 1
690 1 #if OS_EVENT_TBL_SIZE > 1
*ptbl++ = 0x00;
#endif
693 1
694 1 #if OS_EVENT_TBL_SIZE > 2
*ptbl++ = 0x00;
#endif
697 1
698 1 #if OS_EVENT_TBL_SIZE > 3
*ptbl++ = 0x00;
#endif
701 1
702 1 #if OS_EVENT_TBL_SIZE > 4
*ptbl++ = 0x00;
#endif
705 1
706 1 #if OS_EVENT_TBL_SIZE > 5
*ptbl++ = 0x00;
#endif
709 1
710 1 #if OS_EVENT_TBL_SIZE > 6
*ptbl++ = 0x00;
#endif
713 1
714 1 #if OS_EVENT_TBL_SIZE > 7
*ptbl = 0x00;
#endif
717 1 }
718 #endif
719 /*$PAGE*/
720 /*
721 *********************************************************************************************************
722 * SCHEDULER
723 *
724 * Description: This function is called by other uC/OS-II services to determine whether a new, high
725 * priority task has been made ready to run. This function is invoked by TASK level code
726 * and is not used to reschedule tasks from ISRs (see OSIntExit() for ISR rescheduling).
727 *
728 * Arguments : none
729 *
730 * Returns : none
731 *
732 * Notes : 1) This function is INTERNAL to uC/OS-II and your application should not call it.
733 * 2) Rescheduling is prevented when the scheduler is locked (see OSSchedLock())
734 *********************************************************************************************************
735 */
736
737 void OS_Sched (void) reentrant
738 {
739 1 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
742 1 INT8U y;
743 1
744 1
745 1 OS_ENTER_CRITICAL();
746 1 if ((OSIntNesting == 0) && (OSLockNesting == 0)) { /* Sched. only if all ISRs done & not locked */
747 2 y = OSUnMapTbl[OSRdyGrp]; /* Get pointer to HPT ready to run */
C51 COMPILER V8.18 OS_CORE 11/30/2009 13:25:39 PAGE 14
748 2 OSPrioHighRdy = (INT8U)((y << 3) + OSUnMapTbl[OSRdyTbl[y]]);
749 2 if (OSPrioHighRdy != OSPrioCur) { /* No Ctx Sw if current task is highest rdy */
750 3 OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
751 3 OSCtxSwCtr++; /* Increment context switch counter */
752 3 OS_TASK_SW(); /* Perform a context switch */
753 3 }
754 2 }
755 1 OS_EXIT_CRITICAL();
756 1 }
757 /*$PAGE*/
758 /*
759 *********************************************************************************************************
760 * IDLE TASK
761 *
762 * Description: This task is internal to uC/OS-II and executes whenever no other higher priority tasks
763 * executes because they are ALL waiting for event(s) to occur.
764 *
765 * Arguments : none
766 *
767 * Returns : none
768 *
769 * Note(s) : 1) OSTaskIdleHook() is called after the critical section to ensure that interrupts will be
770 * enabled for at least a few instructions. On some processors (ex. Philips XA), enabling
771 * and then disabling interrupts didn't allow the processor enough time to have interrupts
772 * enabled before they were disabled again. uC/OS-II would thus never recognize
773 * interrupts.
774 * 2) This hook has been added to allow you to do such things as STOP the CPU to conserve
775 * power.
776 *********************************************************************************************************
777 */
778
779 void OS_TaskIdle (void *ppdata) reentrant
780 {
781 1 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
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