IAR PowerPac RTOS User Guide

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Example ............................................................................................................................................117RTOS-aware debugging............................................................................................................................... 119Enabling the C-SPY plug-in module...............................................................................................119Overview...........................................................................................................................................119Task list .............................................................................................................................................120Mailboxes ..........................................................................................................................................120Timers...............................................................................................................................................121Resource semaphores .....................................................................................................................121System information .........................................................................................................................122Settings .............................................................................................................................................122Debugging...................................................................................................................................................... 123Runtime errors.................................................................................................................................123List of error codes............................................................................................................................124Performance and resource usage............................................................................................................. 127Introduction......................................................................................................................................127Memory requirements ....................................................................................................................127Benchmarking ..................................................................................................................................127Measurement with port pins and oscilloscope .....................................................................................128Reentrance .................................................................................................................................................... 133Limitations..................................................................................................................................................... 135Source code of kernel and library ........................................................................................................... 137Introduction......................................................................................................................................137Building IAR PowerPac RTOS libraries.........................................................................................137Major compile time switches..........................................................................................................137OS_RR_SUPPORTED ........................................................................................................................137OS_SUPPORT_CLEANUP_ON_TERMINATE................................................................................138Additional modules...................................................................................................................................... 139Keyboard manager: KEYMAN.C....................................................................................................139FAQ (frequently asked questions)............................................................................................................ 141Glossary......................................................................................................................................................... 143Index............................................................................................................................................................... 14510IAR PowerPac RTOSfor ARM CoresPPRTOS-2
Introduction to IAR PowerPacRTOSWhat is IAR PowerPac RTOSIAR PowerPac RTOS is a priority-controlled multitasking system, designed to be used as an embedded operatingsystem for the development of real-time applications.IAR PowerPac RTOS is a high-performance tool that has been optimized for minimum memory consumption in bothRAM and ROM, as well as high speed and versatility.FeaturesThroughout the development process of IAR PowerPac RTOS, the limited resources of microcontrollers have alwaysbeen kept in mind. The internal structure of the realtime operating system (RTOS) has been optimized in a variety ofapplications with different customers, to fit the needs of the industry.IAR PowerPac RTOS is highly modular, which means that only those functions that are needed are linked, keeping theROM size very small. A couple of files are supplied in source code to make sure that you do not loose any flexibilityby using embOS and that you can customize the system to fully fit your needs.The tasks you create can easily and safely communicate with each other using a complete palette of communicationmechanisms such as semaphores, mailboxes, and events.Some features of IAR PowerPac RTOS include:● Preemptive scheduling:Guarantees that of all tasks in READY state the one with the highest priority executes, except for situations wherepriority inversion applies.● Round-robin scheduling for tasks with identical priorities.● Preemptions can be disabled for entire tasks or for sections of a program.● Up to 255 priorities.● Every task can have an individual priority => the response of tasks can be precisely defined according to therequirements of the application.● Unlimited number of tasks(limited only by the amount of available memory).● Unlimited number of semaphores(limited only by the amount of available memory).● 2 types of semaphores: resource and counting.● Unlimited number of mailboxes(limited only by the amount of available memory).● Size and number of messages can be freely defined when initializing mailboxes.● Unlimited number of software timers(limited only by the amount of available memory).● 8-bit events for every task.● Time resolution can be freely selected (default is 1ms).● Easily accessible time variable.● Power management.● Unused calculation time can automatically be spent in halt mode .power-consumption is minimized.PPRTOS-2 11
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: ContentsOS_LeaveInterrupt() .......
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 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
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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(
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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
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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:
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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