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  • FreeRTOS Books and Manuals
  • FreeRTOS
    • About FreeRTOS
      • What is an RTOS/FreeRTOS?
      • A Compelling Free Solution
      • A Better Type of Open Source
      • Coding Standard/MISRA/Testing
      • Features Overview
      • Licensing
      • Site Map
    • Features / Getting Started...
      • Quick Start Guide
      • Tasks & Co-routines
      • More About Tasks...
        • Task States
        • Task Priorities
        • Implementing a Task
        • Idle Task and Idle Hook
      • Queues, Mutexes, Semaphores...
        • Queues
        • Binary Semaphores
        • Counting Semaphores
        • Mutexes
        • Recursive Mutexes
      • Direct To Task Notifications
        • Introduction
        • ...As Binary Semaphore
        • ...As Counting Semaphore
        • ...As Event Group
        • ...As Mailbox
      • Stream & Message Buffers
        • ...ISR to Task Streams
        • ...Core to Core Messages
      • Software Timers
        • Introduction
        • Timer Service Daemon Task
        • Timer Daemon Configuration
        • One-Shot Vs Auto-Reload
        • Resetting a Timer
      • Event Groups (or 'flags')
      • More About Co-routines...
        • Co-routine Status
        • Co-routine Priorities
        • Implementing a Co-routine
        • Scheduling Co-routines
        • Limitations and Restrictions
        • Quick Co-routine Example
        • Standard Demo Examples
      • Source Code Organisation
    • More Advanced...
      • Creating a New Project
      • FreeRTOSConfig.h
      • Trace Features
      • Low Power Support
      • Run Time Stats
      • Blocking on Multiple Objects
      • Deferred Interrupt Handling
      • Static Vs Dynamic Memory
      • Memory Management
      • Memory Protection Support
      • Stack Overflow Protection
      • Hook Functions
      • Thread Local Storage Pointers
      • How FreeRTOS Works
        • Introduction
        • Fundamentals
          • Multitasking Basics
          • Schedulinig Basics
          • Context Switching
          • Real Time Applications
          • Real Time Scheduling
        • Implementation
          • Building Blocks
            • Development Tools
            • The RTOS Tick
            • GCC Signal Attribute
            • GCC Naked Attribute
            • FreeRTOS Tick Code
            • AVR Context
            • Saving the Context
            • Restoring the Context
          • Detailed Example
            • Putting It All Together
            • Step 1
            • Step 2
            • Step 3
            • Step 4
            • Step 5
            • Step 6
            • Step 7
      • RAM Constrained Design Tips
        • Page 1
        • Page 2
        • Page 3
        • Page 4
        • Page 5
      • Porting Guide
      • Windows Simulator
      • Posix/Linux Simulator
      • Legacy Trace Facility
    • Demo Projects
      • Standard Demos
      • Basic Demos
      • Hardware Independent
      • Modifying a Demo
      • TCP/IP Demos
    • Supported Devices & Demos
      • Official & Contributed Definitions
      • Simple List of Ports
      • Officially Supported Demos
      • TCP/IP Demos
    • API Reference
      • PDF Reference Manual
      • Task Creation
        • TaskHandle_t (type)
        • xTaskCreate()
        • xTaskCreateStatic()
        • vTaskDelete()
      • Task Control
        • vTaskDelay()
        • vTaskDelayUntil()
        • uxTaskPriorityGet()
        • vTaskPrioritySet()
        • vTaskSuspend()
        • vTaskResume()
        • xTaskResumeFromISR()
        • xTaskAbortDelay()
      • Task Utilities
        • uxTaskGetSystemState()
        • vTaskGetInfo()
        • xTaskGetApplicationTaskTag()
        • xTaskGetCurrentTaskHandle()
        • xTaskGetHandle()
        • xTaskGetIdleTaskHandle()
        • uxTaskGetStackHighWaterMark()
        • eTaskGetState()
        • pcTaskGetName()
        • xTaskGetTickCount()
        • xTaskGetTickCountFromISR()
        • xTaskGetSchedulerState()
        • uxTaskGetNumberOfTasks()
        • vTaskList()
        • vTaskStartTrace()
        • ulTaskEndTrace()
        • vTaskGetRunTimeStats()
        • vTaskSetApplicationTaskTag()
        • xTaskCallApplicationTaskHook()
        • 'SetThreadLocalStoragePointer()
        • 'GetThreadLocalStoragePointer()
        • vTaskSetTimeOutState()
        • xTaskGetCheckForTimeOut()
      • RTOS Kernel Control
        • taskYIELD()
        • taskENTER_CRITICAL()
        • taskEXIT_CRITICAL()
        • taskENTER_CRITICAL_FROM_ISR()
        • taskEXIT_CRITICAL_FROM_ISR()
        • taskDISABLE_INTERRUPTS()
        • taskENABLE_INTERRUPTS()
        • vTaskStartScheduler()
        • vTaskEndScheduler()
        • vTaskSuspendAll()
        • xTaskResumeAll()
        • vTaskStepTick()
      • Direct To Task Notifications
        • xTaskNotifyGive()
        • vTaskNotifyGiveFromISR()
        • ulTaskNotifyTake()
        • xTaskNotify()
        • xTaskNotifyAndQuery()
        • xTaskNotifyAndQueryFromISR()
        • xTaskNotifyFromISR()
        • xTaskNotifyWait()
        • xTaskNotifyStateClear()
      • Queues
        • xQueueCreate()
        • xQueueCreateStatic()
        • vQueueDelete()
        • xQueueSend()
        • xQueueSendFromISR()
        • xQueueSendToBack()
        • xQueueSendToBackFromISR()
        • xQueueSendToFront()
        • xQueueSendToFrontFromISR()
        • xQueueReceive()
        • xQueueReceiveFromISR()
        • uxQueueMessagesWaiting()
        • uxQueueMessagesWaitingFromISR()
        • uxQueueSpacesAvailable()
        • xQueueReset()
        • xQueueOverwrite()
        • xQueueOverwriteFromISR()
        • xQueuePeek()
        • xQueuePeekFromISR()
        • vQueueAddToRegistry()
        • vQueueUnregisterQueue()
        • pcQueueGetName()
        • xQueueIsQueueFullFromISR()
        • xQueueIsQueueEmptyFromISR()
      • Queue Sets
        • xQueueCreateSet()
        • xQueueAddToSet()
        • xQueueRemoveFromSet()
        • xQueueSelectFromSet()
        • xQueueSelectFromSetFromISR()
      • Stream Buffers
        • xStreamBufferCreate()
        • xStreamBufferCreateStatic()
        • xStreamBufferSend()
        • xStreamBufferSendFromISR()
        • xStreamBufferReceive()
        • xStreamBufferReceiveFromISR()
        • vStreamBufferDelete()
        • xStreamBufferBytesAvailable()
        • xStreamBufferSpacesAvailable()
        • xStreamBufferSetTriggerLevel()
        • xStreamBufferReset()
        • xStreamBufferIsEmpty()
        • xStreamBufferIsFull()
      • Message Buffers
        • xMessageBufferCreate()
        • xMessageBufferCreateStatic()
        • xMessageBufferSend()
        • xMessageBufferSendFromISR()
        • xMessageBufferReceive()
        • xMessageBufferReceiveFromISR()
        • vMessageBufferDelete()
        • xMessageBufferSpacesAvailable()
        • xMessageBufferReset()
        • xMessageBufferIsEmpty()
        • xMessageBufferIsFull()
      • Semaphore / Mutexes
        • xSemaphoreCreateBinary()
        • xSemaphoreCreateBinaryStatic()
        • vSemaphoreCreateBinary()
        • xSemaphoreCreateCounting()
        • xSemaphoreCreateCountingStatic()
        • xSemaphoreCreateMutex()
        • xSemaphoreCreateMutexStatic()
        • xSem'CreateRecursiveMutex()
        • xSem'CreateRecursiveMutexStatic()
        • vSemaphoreDelete()
        • xSemaphoreGetMutexHolder()
        • uxSemaphoreGetCount()
        • xSemaphoreTake()
        • xSemaphoreTakeFromISR()
        • xSemaphoreTakeRecursive()
        • xSemaphoreGive()
        • xSemaphoreGiveRecursive()
        • xSemaphoreGiveFromISR()
      • Software Timers
        • xTimerCreate()
        • xTimerCreateStatic()
        • xTimerIsTimerActive()
        • xTimerStart()
        • xTimerStop()
        • xTimerChangePeriod()
        • xTimerDelete()
        • xTimerReset()
        • xTimerStartFromISR()
        • xTimerStopFromISR()
        • xTimerChangePeriodFromISR()
        • xTimerResetFromISR()
        • pvTimerGetTimerID()
        • vTimerSetReloadMode()
        • vTimerSetTimerID()
        • xTimerGetTimerDaemonTaskHandle()
        • xTimerPendFunctionCall()
        • xTimerPendFunctionCallFromISR()
        • pcTimerGetName()
        • xTimerGetPeriod()
        • xTimerGetExpiryTime()
      • Event Groups (or 'flags')
        • xEventGroupCreate()
        • xEventGroupCreateStatic()
        • vEventGroupDelete()
        • xEventGroupWaitBits()
        • xEventGroupSetBits()
        • xEventGroupSetBitsFromISR()
        • xEventGroupClearBits()
        • xEventGroupClearBitsFromISR()
        • xEventGroupGetBits()
        • xEventGroupGetBitsFromISR()
        • xEventGroupSync()
      • FreeRTOS-MPU Specific
        • xTaskCreateRestricted()
        • vTaskAllocateMPURegions()
        • 'SWITCH_TO_USER_MODE()
      • Co-routines
        • CoRoutineHandle_t (type)
        • xCoRoutineCreate()
        • crDELAY()
        • crQUEUE_SEND()
        • crQUEUE_RECEIVE()
        • crQUEUE_SEND_FROM_ISR()
        • crQUEUE_RECEIVE_FROM_ISR()
        • vCoRoutineSchedule()
    • Contact & Support
      • Contact
      • Free Support Forum
      • Commercial Support
      • FAQ
  • FreeRTOS Interactive!
    • Contributed Vs Official Code
    • Contributing Source Code
    • Upload / Download Contributions

Quick Start Guide
Support Forum
⇓ Download Source ⇓

FreeRTOS+ Ecosystem
 FreeRTOS+ TCP:
 Thread safe TCP/IP stack
 SafeRTOS:
 TUV certified RTOS
 OpenRTOS:
 Commercial Licensed RTOS
 Fail Safe File System:
 Ensures data integrity
 FreeRTOS BSPs:
 3rd party driver packages
 Trace & Visualisation:
 Tracealyzer for FreeRTOS
 CLI:
 Command line interface
 WolfSSL SSL / TLS:
 Networking security protocols
 RTOS Training:
 Delivered online or on-site
 IO:
 read(), write(), ioctl() interface

FreeRTOS+ Lab Projects
 IoT MQTT:
 PubSub messaging protocol
 IoT HTTPS
 Request + response msging
 IoT Task Pool:
 A shared collection of tasks
 FreeRTOS+POSIX:
 POSIX threading API
 FreeRTOS+FAT:
 Thread aware file system
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FreeRTOS Support Archive

The FreeRTOS support forum can be used for active support both from Amazon Web Services and the community. In return for using our software for free, we request you play fair and do your bit to help others! Sign up to receive notifications of new support topics then help where you can.

 

 

This is a read-only archive of threads posted to the FreeRTOS support forum. The archive is updated every week, so will not always contain the very latest posts. Use these archive pages to search previous posts. Use the Live FreeRTOS Forum link to reply to a post, or start a new support thread .



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  • Threads from 2004
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Latest News

FreeRTOS v10.2.1 is available for immediate download. MIT licensed, includes 64-bit RISC-V, NXP Cortex-M33 demo & Nuvoton Cortex-M23 demo & STM32H745 dual core (AMP) demo.

New Updates to MIT licensed IoT MQTT and POSIX libraries are now available. New library IoT HTTPS is available.  Includes demo projects.

View a recording of the “OTA Update Security and Reliability” webinar, presented by TI and AWS.

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