IAR PowerPac RTOS User Guide

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Task routine API function overviewRoutineOS_CREATETASK()OS_CreateTask()OS_CREATETASK_EX()OS_CreateTaskEx()OS_Delay()OS_DelayUntil()OS_SetPriority()OS_GetPriority()OS_SetTimeSlice()OS_Suspend()OS_Resume()OS_GetSuspendCnt()OS_Terminate()OS_WakeTask()OS_IsTask()OS_GetTaskID()OS_GetpCurrentTask()Table 3: Task routine API listOS_CREATETASK()DescriptionCreates a task.Prototypevoid OS_CREATETASK (OS_TASK* pTask,char* pName,void* pRoutine,unsigned char Priority,void* pStack);ParameterDescriptionpTaskpNamepRoutinePriorityAdditional InformationDescriptionCreates a task.Creates a task.Creates a task with parameter.Creates a task with parameter.Suspends the calling task for a specified period of time.Suspends the calling task until a specified time.Assigns a specified priority to a specified task.Returns the priority of a specified taskAssigns a specified timeslice value to a specified task.Suspends the specified task.Decrements the suspend count of specified task and resumes the task, if the suspendcount reaches zero.Returns the suspension count.Ends (terminates) a task.Ends delay of a task immediately.Determines whether a task control block actually belongs to a valid task.Returns the ID of the currently running task.Returns a pointer to the task control block structure of the currently running task.Pointer to a data structure of type OS_TASK which will be used as task control block (andreference) for this task.Pointer to the name of the task. Can be NULL (or 0) if not used.Pointer to a routine that should run as a taskPriority of the task. Must be within the following range:1
Task routinesOS_CREATETASK() can be called at any time, either from main() during initialization or from any other task. Therecommended strategy is to create all tasks during initialization in main() to keep the structure of your tasks easy tounderstand.The absolute value of Priority is of no importance, only the value in comparison to the priorities of other tasks.OS_CREATETASK() determines the size of the stack automatically, using sizeof. This is possible only if the memoryarea has been defined at compile time.ImportantThe stack that you define has to reside in an area that the CPU can actually use as stack. Most CPUs cannot use theentire memory area as stack.Most CPUs require alignment of stack in multiples of bytes. This is automatically done,when the task stack is defined as an array of integers.ExampleOS_STACKPTR int UserStack[150]; /* Stack-space */OS_TASK UserTCB; /* Task-control-blocks */void UserTask(void) {while (1) {Delay (100);}}void InitTask(void) {OS_CREATETASK(&UserTCB, "UserTask", UserTask, 100, UserStack);}OS_CreateTask()DescriptionCreates a task.Prototypevoid OS_CreateTask (OS_TASK* pTask,char*pName,unsigned char Priority,voidRoutine* pRoutine,void*pStack,unsigned StackSize,unsigned char TimeSlice);)ParameterDescriptionpTaskpNamePrioritypRoutinepStackStackSizeTimeSliceAdditional InformationPointer to a data structure of type OS_TASK which will be used as the task control block (andreference) for this task.Pointer to the name of the task. Can be NULL (or 0) if not used.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: Task routinesIntroductionA task tha
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
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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(
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Heap type memory managementANSI C o
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Fixed block size memory poolsIntrod
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Fixed block size memory poolsProtot
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Fixed block size memory poolsProtot
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StacksIntroductionThe stack is the
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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:
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FAQ (frequently asked questions)Q:
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GlossaryActive TaskCooperativemulti
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IndexIndexAAdditional modules . . .
Page 147:
IndexOS_WaitSingleEventTimed(). . .
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