IAR PowerPac RTOS User Guide

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140IAR PowerPac RTOSfor ARM CoresPPRTOS-2
FAQ (frequently asked questions)Q: Can I implement different priority scheduling algorithms ?A: Yes, the system is fully dynamic, which means that task priorities can be changed while the system is running(using OS_SetPriority()). This feature can be used for changing priorities in a way so that basicallyevery desired algorithm can be implemented. One way would be to have a task control task with apriority higher than that of all other tasks that dynamically changes priorities. Normally, the priority-controlledround-robin algorithm is perfect for real-time applications.Q: Can I use a different interrupt source for IAR PowerPac RTOS?A: Yes, any periodical signal can be used, that is any internal timer, but it could also be an external signal.Q: What interrupt priorities can I use for the interrupts my program uses?A: Any.PPRTOS-2 141
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IAR PowerPac RTOSUser GuidePPRTOS-2
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PrefaceWelcome to the IAR PowerPac
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ContentsPreface ...................
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ContentsOS_WaitCSema() ............
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ContentsOS_LeaveInterrupt() .......
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Introduction to IAR PowerPacRTOSWha
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Basic conceptsTasksIn this context,
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Basic conceptsPREEMPTIVES MULTITASK
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Basic conceptsMAILBOXES AND QUEUESA
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Basic conceptsThe active task may b
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Basic conceptsThe flowchart below i
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Basic conceptsLIST OF LIBRARIESIn y
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Task routinesIntroductionA task tha
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Task routinesOS_CREATETASK() can be
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Task routinesExampleThe following e
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Task routinesExampleint sec,min;voi
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Task routinesAdditional Information
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Task routinesReturn valueOS_TASKID:
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Software timersSoftware timerA soft
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Software timers#define OS_CREATETIM
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Software timersOS_SetTimerPeriod()D
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Software timersAdditional Informati
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Software timersAdditional Informati
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Software timersExampleOS_TIMER TIME
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Resource semaphoresIntroductionReso
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Resource semaphoresResource semapho
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Resource semaphoresOS_Request()Desc
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Counting SemaphoresIntroductionCoun
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Counting SemaphoresPrototypevoid OS
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Counting SemaphoresReturn value0: I
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MailboxesWhy mailboxes?In the prece
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MailboxesMailboxes API function ove
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MailboxesExampleSingle-byte mailbox
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MailboxesPrototypevoid OS_GetMail (
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MailboxesOS_WaitMail()DescriptionWa
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QueuesWhy queues?In the preceding c
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QueuesReturn valueThe size of the r
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QueuesExamplestatic void MemoryTask
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Task eventsIntroductionTask events
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Task eventsExampleOS_WaitEventTimed
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Task eventsPrototypechar OS_ClearEv
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Event objectsIntroductionEvent obje
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Event objectsExampleif (OS_EVENT_Wa
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Event objectsExampleOS_EVENT_Reset(
Page 89 and 90: 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
Page 97 and 98: StacksIntroductionThe stack is the
Page 99 and 100: InterruptsIntroductionIn this chapt
Page 101 and 102: InterruptsRules for interrupt handl
Page 103 and 104: InterruptsOS_LeaveInterruptNoSwitch
Page 105 and 106: InterruptsNesting interrupt routine
Page 107 and 108: Critical RegionsIntroductionCritica
Page 109 and 110: System variablesIntroductionThe sys
Page 111 and 112: Configuration for your targetsystem
Page 113 and 114: Time measurementIntroductionIAR Pow
Page 115 and 116: Time measurementPrototypeU32 OS_Get
Page 117 and 118: Time measurementPrototypeOS_U32 OS_
Page 119 and 120: RTOS-aware debuggingThis chapter de
Page 121 and 122: RTOS-aware debuggingTimersA softwar
Page 123 and 124: DebuggingRuntime errorsSome error c
Page 125 and 126: DebuggingValue Define Description17
Page 127 and 128: Performance and resource usageThis
Page 129 and 130: Performance and resource usageThe c
Page 131 and 132: Performance and resource usage*/sta
Page 133 and 134: ReentranceAll routines that can be
Page 135 and 136: LimitationsThe following limitation
Page 137 and 138: Source code of kernel and libraryIn
Page 139: Additional modulesKeyboard manager:
Page 143 and 144: GlossaryActive TaskCooperativemulti
Page 145 and 146: IndexIndexAAdditional modules . . .
Page 147: IndexOS_WaitSingleEventTimed(). . .
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IAR PowerPac RTOS User Guide

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