RTOS TRAINING

RTOS

• INTRODUCTION AND SCOPE
• An Introduction to Multi Tasking in Small Embedded Systems
• What is FreeRTOS?

TASK MANAGEMENT

• TASK FUNCTIONS
• TOP LEVEL TASK STATES
• CREATING TASKS
• xTaskCreate() API Function
• Example 1. Creating Tasks
• Example 2. Using the Task Parameter
• TASK PRIORITIES
• Example 3. Experimenting with priorities
• EXPANDING THE NOT RUNNING’ STATE
• The Blocked State
• The Suspended State
• The Ready State
• Completing the State Transition Diagram
• Example 4. Using the Blocked state to create a delay
• vTaskDelayUntil() API function
• THE IDLE TASK AND THE IDLE TASK HOOK
• Idle Task Hook Functions
• Limitations on the Implementation of Idle Task Hook Functions
• Example 7. Defining an Idle Task Hook Function
• CHANGING THE PRIORITY OF A TASK
• vTaskPrioritySet() API function
• uxTaskPriorityGet() API
• Example 8. Changing task priorities
• DELETING A TASK
• vTaskDelete() API function
• Example 9. Deleting tasks
• THE SCHEDULING ALGORITHM – A SUMMARY
• Prioritized Preemptive Scheduling
• Selecting Task Priorities
• Co-operative Scheduling

QUEUE MANAGEMENT

• INTRODUCTION AND SCOPE
• Scope
• CHARACTERISTICS OF A QUEUE
• Data Storage
• Access by Multiple Tasks
• Blocking on Queue Reads
• Blocking on Queue Writes
• USING A QUEUE
• xQueueCreate() API Function
• xQueueSendToBack() and xQueueSendToFront() API Functions
• xQueueReceive() and xQueuePeek() API Functions
• uxQueueMessagesWaiting() API Function
• Example 10. Blocking When Receiving From a Queue
• Using Queues to Transfer Compound Types
• Example 11. Blocking When Sending to a Queue / Sending Structures on a Queue
• WORKING WITH LARGE DATA

INTERRUPT MANAGEMENT

• INTRODUCTION AND SCOPE
• Events
• Scope
• DEFERRED INTERRUPT PROCESSING
• Binary Semaphores used for Synchronization
• vSemaphoreCreateBinary() API Function
• xSemaphoreTake() API Function
• xSemaphoreGiveFromISR() API Function
• Example 12. Using a Binary Semaphore to Synchronize a Task with an Interrupt
• COUNTING SEMAPHORES
• xSemaphoreCreateCounting() API Function
• Example 13. Using a Counting Semaphore to Synchronize a Task with an
• Interrupt
• USING QUEUES WITHIN AN INTERRUPT SERVICE ROUTINE
• xQueueSendToFrontFromISR() and xQueueSendToBackFromISR() API Functions
• Efficient Queue Usage
• Example 14. Sending and Receiving on a Queue from Within an Interrupt
• INTERRUPT NESTING

RESOURCE MANAGEMENT

• INTRODUCTION AND SCOPE
• Mutual Exclusion
• Scope
• CRITICAL SECTIONS AND SUSPENDING THE SCHEDULER
• Basic Critical Sections
• Suspending (or Locking) the Scheduler
• vTaskSuspendAll() API Function
• xTaskResumeAll() API Function
• MUTEXES (AND BINARY SEMAPHORES)
• xSemaphoreCreateMutex() API Function
• Example 15. Rewriting vPrintString() to Use a Semaphore
• Priority Inversion
• Priority Inheritance
• Deadlock (or Deadly Embrace)
• GATEKEEPER TASKS
• Example 16. Re-writing vPrintString() to Use a Gatekeeper Task

MEMORY MANAGEMENT

• INTRODUCTION AND SCOPE
• Scope
• EXAMPLE MEMORY ALLOCATION SCHEMES
• Heap_1.c
• Heap_2.c
• Heap_3.c

Real Time Application Design

• Using Free RTOS in small Embedded System
• INTRODUCTION
• TOP Level software requirement
• Application Component
• Why use an RTOS kernel?
• Synopsis
• Implementation
• Scheduling application functions
• Making a fully Preemptive system
• Reducing RAM utilization
• Reducing Processor Overhead