IAR PowerPac RTOS User Guide

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ExampleThe task that handles the serial input and the keyboard waits for a character to be received either via the keyboard(EVENT_KEYPRESSED) or serial interface (EVENT_SERIN):/** Just a small demo for events*/#define EVENT_KEYPRESSED (1)#define EVENT_SERIN (2)OS_STACKPTR int Stack0[96], Stack1[64]; /* Task stacks */OS_TASK TCB0, TCB1; /* Data area for tasks (task control blocks) */void Task0(void) {OS_U8 MyEvent;while(1)MyEvent = OS_WaitEvent(EVENT_KEYPRESSED | EVENT_SERIN)if (MyEvent & EVENT_KEYPRESSED) {/* handle key press */}if (MyEvent & EVENT_SERIN) {/* Handle serial reception */}}}void TimerKey(void) {/* More code to find out if key has been pressed */OS_SignalEvent(EVENT_SERIN, &TCB0); /* Notify Task that key was pressed */}void InitTask(void) {OS_CREATETASK(&TCB0, 0, Task0, 100, Stack0); /* Create Task0 */}If the task was only waiting for a key to be pressed, OS_GetMail() could simply be called. The task would then bedeactivated until a key is pressed. If the task has to handle multiple mailboxes, as in this case, events are a good option.OS_GetEventsOccurred()DescriptionReturns a list of events that have occurred for a specified task.Prototypechar OS_GetEventsOccurred (OS_TASK* pTask);ParameterDescriptionpTaskTable 87: OS_getEventsOccured() parameter listReturn valueThe event mask of the events that have actually occurred.Additional InformationBy calling this function, the actual events remain signaled. The event memory is not cleared. This is one way for a taskto find out which events have been signaled. The task is not suspended if no events are available.OS_ClearEvents()DescriptionThe task who's event mask is to be returned,NULL means current task.Returns the actual state of events and then clears the events of a specified task.80IAR PowerPac RTOSfor ARM CoresPPRTOS-2
Task eventsPrototypechar OS_ClearEvents (OS_TASK* pTask);ParameterDescriptionpTaskTable 88: OS_ClearEvents() parameter listReturn valueThe task who's event mask is to be returned,NULL means current task.The events that were actually signaled before clearing.PPRTOS-281
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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
Page 29 and 30: Task routinesExampleThe following e
Page 31 and 32: Task routinesExampleint sec,min;voi
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: Task eventsExampleOS_WaitEventTimed
Page 83 and 84: Event objectsIntroductionEvent obje
Page 85 and 86: Event objectsExampleif (OS_EVENT_Wa
Page 87 and 88: 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
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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:
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FAQ (frequently asked questions)Q:
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GlossaryActive TaskCooperativemulti
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IndexIndexAAdditional modules . . .
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IndexOS_WaitSingleEventTimed(). . .
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IAR PowerPac RTOS User Guide

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