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KERNEL
Home
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Coding, Testing, & Style
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Developer Docs
Tasks and Co-routines
Tasks Introduction
Task States
Task Priorities
Implementing a Task
Co-routine States
Implementing a Co-routine
Co-routine Priorities
Scheduling Co-routines
Limitations and Restrictions
More About Co-routines...
Quick Co-routine Example
Standard Demo Examples
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
Introduction
...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")
Source Code Organization
FreeRTOSConfig.h
Static Vs Dynamic Memory
Heap Memory Management
Stack Overflow Protection
Creating a New Project
Secondary Docs
Idle Task
Hooks (Callbacks)
Memory Protection Support
Thread Local Storage Pointers
Blocking on Multiple Objects
Deferred Interrupt Handling
Low Power Support
Trace Features
Run Time Stats
Porting Guide
Legacy Trace Facility
FreeRTOS Concepts
RTOS Fundamentals
Multitasking Basics
Scheduling 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
Introduction
Solution 1
Solution 2
Solution 3
Solution 4
Import and Build an RTOS Demo Project in Eclipse
Windows Simulator
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Kernel Ports
Demos
Supported Demos
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Modifying a Demo
API Reference
Task Creation
TaskHandle_t (type)
xTaskCreate()
xTaskCreateStatic()
xTaskCreateRestrictedStatic()
vTaskDelete()
Task Control
vTaskDelay()
vTaskDelayUntil()
xTaskDelayUntil()
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()
xTaskCatchUpTicks()
Direct To Task Notifications
xTaskNotifyGive()
vTaskNotifyGiveFromISR()
ulTaskNotifyTake()
xTaskNotify()
xTaskNotifyAndQuery()
xTaskNotifyAndQueryFromISR()
xTaskNotifyFromISR()
xTaskNotifyWait()
xTaskNotifyStateClear()
ulTaskNotifyValueClear()
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()
uxTimerGetReloadMode()
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()
Licensing
WHAT'S NEW
FreeRTOS:
The latest release now includes the SNTP library, see
blog post
.
AWS Reference Integrations:
See our latest 202107.00 release's
blog post
.
FreeRTOS SMP:
See our
blog post
on the latest development.
Embedded World track keynote:
Watch
Richard Barry's 2021 talk on future proofing MCU devices.
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Kernel
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Secondary Docs
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FreeRTOS Concepts
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RTOS Fundamentals
RTOS Fundamentals
Pages
Multitasking
Scheduling
Context Switching
Real Time Applications
Real Time Scheduling
Detailed Description
This section provides a very brief introduction to real time and multitasking concepts. These must be understood before reading section 2.
Next:
RTOS Fundamentals - Multitasking
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