IAR PowerPac RTOS User Guide

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Additional InformationThis function works the same way as OS_CreateTask(), except that a parameter is passed to the task function.An example of parameter passing to tasks is shown under OS_CREATETASK_EX().OS_Delay()DescriptionSuspends the calling task for a specified period of time.Prototypevoid OS_Delay (int ms);ParameterDescriptionmsTable 8: OS_Delay() parameter listAdditional InformationThe calling task will be put into the TS_DELAY state for the period of time specified. The task will stay in the delayedstate until the specified time has expired. The parameter ms specifies the precise interval during which the task has tobe suspended given in basic time intervals (usually 1/1000 sec). The actual delay (in basic time intervals) will be in thefollowing range: ms - 1
Task routinesExampleint sec,min;void TaskShowTime() {int t0 = OS_GetTime();while (1) {ShowTime(); /* Routine to display time */OS_DelayUntil (t0 += 1000);if (sec < 59) sec++;else {sec=0;min++;}}}In the example above, the use of OS_Delay() could lead to accumulating delays and would cause the simple "clock"to be slow.OS_SetPriority()DescriptionAssigns a specified priority to a specified task.Prototypevoid OS_SetPriority (OS_TASK* pTask,unsigned char Priority);ParameterDescriptionpTaskPriorityTable 10: OS_SetPriority() parameter listAdditional InformationCan be called at any time from any task or software timer. Calling this function might lead to an immediate task switch.ImportantThis function may not be called from within an interrupt handler.OS_GetPriority()DescriptionReturns the priority of a specified task.Prototypeunsigned char OS_GetPriority (OS_TASK* pTask);ParameterDescriptionpTaskTable 11: OS_GetPriority() parameter listReturn valuePriority of the specified task as an "unsigned character" (range 1 to 255).Additional InformationIf pTask is the NULL pointer, the function returns the priority of the currently running task. If pTask does not specifya valid task, the debug version of IAR PowerPac RTOS calls OS_Error(). The release version of IAR PowerPac RTOScannot check the validity of pTask and may therefore return invalid values if pTask does not specify a valid task.ImportantPointer to a data structure of type OS_TASK.Priority of the task. Must be within the following range:1
Page 1 and 2: IAR PowerPac RTOSUser GuidePPRTOS-2
Page 3 and 4: PrefaceWelcome to the IAR PowerPac
Page 5 and 6: ContentsPreface ...................
Page 7 and 8: ContentsOS_WaitCSema() ............
Page 9 and 10: ContentsOS_LeaveInterrupt() .......
Page 11 and 12: Introduction to IAR PowerPacRTOSWha
Page 13 and 14: Basic conceptsTasksIn this context,
Page 15 and 16: Basic conceptsPREEMPTIVES MULTITASK
Page 17 and 18: Basic conceptsMAILBOXES AND QUEUESA
Page 19 and 20: Basic conceptsThe active task may b
Page 21 and 22: Basic conceptsThe flowchart below i
Page 23 and 24: Basic conceptsLIST OF LIBRARIESIn y
Page 25 and 26: Task routinesIntroductionA task tha
Page 27 and 28: Task routinesOS_CREATETASK() can be
Page 29: Task routinesExampleThe following e
Page 33 and 34: Task routinesAdditional Information
Page 35 and 36: Task routinesReturn valueOS_TASKID:
Page 37 and 38: Software timersSoftware timerA soft
Page 39 and 40: Software timers#define OS_CREATETIM
Page 41 and 42: Software timersOS_SetTimerPeriod()D
Page 43 and 44: Software timersAdditional Informati
Page 45 and 46: Software timersAdditional Informati
Page 47 and 48: Software timersExampleOS_TIMER TIME
Page 49 and 50: Resource semaphoresIntroductionReso
Page 51 and 52: Resource semaphoresResource semapho
Page 53 and 54: Resource semaphoresOS_Request()Desc
Page 55 and 56: Counting SemaphoresIntroductionCoun
Page 57 and 58: Counting SemaphoresPrototypevoid OS
Page 59 and 60: Counting SemaphoresReturn value0: I
Page 61 and 62: MailboxesWhy mailboxes?In the prece
Page 63 and 64: MailboxesMailboxes API function ove
Page 65 and 66: MailboxesExampleSingle-byte mailbox
Page 67 and 68: MailboxesPrototypevoid OS_GetMail (
Page 69 and 70: MailboxesOS_WaitMail()DescriptionWa
Page 71 and 72: QueuesWhy queues?In the preceding c
Page 73 and 74: QueuesReturn valueThe size of the r
Page 75 and 76: QueuesExamplestatic void MemoryTask
Page 77 and 78: Task eventsIntroductionTask events
Page 79 and 80: Task eventsExampleOS_WaitEventTimed
Page 81 and 82:
Task eventsPrototypechar OS_ClearEv
Page 83 and 84:
Event objectsIntroductionEvent obje
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Event objectsExampleif (OS_EVENT_Wa
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Event objectsExampleOS_EVENT_Reset(
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Heap type memory managementANSI C o
Page 91 and 92:
Fixed block size memory poolsIntrod
Page 93 and 94:
Fixed block size memory poolsProtot
Page 95 and 96:
Fixed block size memory poolsProtot
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StacksIntroductionThe stack is the
Page 99 and 100:
InterruptsIntroductionIn this chapt
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InterruptsRules for interrupt handl
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InterruptsOS_LeaveInterruptNoSwitch
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InterruptsNesting interrupt routine
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Critical RegionsIntroductionCritica
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System variablesIntroductionThe sys
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Configuration for your targetsystem
Page 113 and 114:
Time measurementIntroductionIAR Pow
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Time measurementPrototypeU32 OS_Get
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Time measurementPrototypeOS_U32 OS_
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RTOS-aware debuggingThis chapter de
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RTOS-aware debuggingTimersA softwar
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DebuggingRuntime errorsSome error c
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DebuggingValue Define Description17
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Performance and resource usageThis
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Performance and resource usageThe c
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Performance and resource usage*/sta
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ReentranceAll routines that can be
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LimitationsThe following limitation
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Source code of kernel and libraryIn
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Additional modulesKeyboard manager:
Page 141 and 142:
FAQ (frequently asked questions)Q:
Page 143 and 144:
GlossaryActive TaskCooperativemulti
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IndexIndexAAdditional modules . . .
Page 147:
IndexOS_WaitSingleEventTimed(). . .
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IAR PowerPac RTOS User Guide

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