Free FreeRTOS Course-Task Management

Introduction to FreeRTOS V6.0.5

About SwiftACT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Introduction to FreeRTOS V6.0.5 Amr Ali Abdel-Naby@2010

About Me ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Introduction to FreeRTOS V6.0.5 Amr Ali Abdel-Naby@2010

Copyright ,[object Object],[object Object],[object Object],[object Object],Introduction to FreeRTOS V6.0.5 Amr Ali Abdel-Naby@2010

Course Objectives ,[object Object],[object Object],[object Object],[object Object],Introduction to FreeRTOS V6.0.5 Amr Ali Abdel-Naby@2010

Course Notes ,[object Object],[object Object],[object Object],[object Object],Introduction to FreeRTOS V6.0.5 Amr Ali Abdel-Naby@2010

Course References ,[object Object],Introduction to FreeRTOS V6.0.5 Amr Ali Abdel-Naby@2010

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Task C/Cs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Task States & Transitions Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5 Blocked Ready Running Suspended Event vTaskSuspend vTaskSuspend vTaskSuspend vTaskResume Blocking API

Task Priorities Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5 Priority Task 1 Task 2 Task 3 IDLE Task 2 … configMAX_PRIORITIES - 1 … tskIDLE_PRIORITY

Implementing a Task ,[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5 /* Endless Loop Task */ void vATaskFunction (void * pvParameters){ for(;;){ /* Task Code Here */ } }

Task’s Hook ,[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5 static portBASE_TYPE prvExampleTaskHook(void * pvParameter){ /* Perform some action - this could be anything from logging a value, updating the task state, outputting a value, etc. */ return 0; }

Idle Task ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Idle Task Hook ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5 void vApplicationIdleHook (void){ /* Application Hook Code */ }

Task Management APIs ,[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5 Control vTaskDelay vTaskDelayUntil uxTaskPriorityGet vTaskPrioritySet vTaskSuspend vTaskResume xTaskResumeFromISR Creation xTaskCreate vTaskDelete Utilities tskIDLE_PRIORITY xTaskGetTickCount uxTaskGetNumberOfTasks vTaskList vTaskGetRunTimeStats vTaskStartTrace ulTaskEndTrace uxTaskGetStackHighWaterMark vTaskSetApplicationTaskTag xTaskGetApplicationTaskTag xTaskCallApplicationTaskHook

Creating a Task, xTaskCreate ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Creating a Task, xTaskCreate cont’d ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Deleting a Task, vTaskDelete ,[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Delaying a Task, vTaskDelay ,[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Delaying a Task until a Specified Time, vTaskDelayUntil ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Delaying a Task until a Specified Time, vTaskDelayUntil cont’d ,[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5 void vTaskFunction(void * vParameters{ portTickType xLastWakeTime; const portTickType xFrequency = 10; // Initialise the xLastWakeTime variable with the current time. xLastWakeTime = xTaskGetTickCount(); for( ;; ){ // Wait for the next cycle. vTaskDelayUntil(&xLastWakeTime, xFrequency); // Perform action here. } }

Getting a Task’s Priority, uxTaskPriorityGet ,[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Setting a Task’s Priority, vTaskPrioritySet ,[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Suspending a Task, vTaskSuspend ,[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Resuming a Task, vTaskResume ,[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Resuming a Task from ISR, vTaskResumeFromISR ,[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Getting System Time, xTaskGetTickCount ,[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Getting Number of Tasks in the System, uxTaskGetNumberOfTasks ,[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Listing Tasks in the System, vTaskList ,[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Getting Tasks’ Run-Time Statistics, vTaskGetRunTimeStats ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Starting Tasks’ Trace, vTaskStartTrace ,[object Object],[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Ending Tasks’ Trace, ulTaskEndTrace ,[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Getting Task’s Stack Watermark, uxTaskGetStackHighWaterMark ,[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Hooking a Task, vTaskSetApplicationTaskTag ,[object Object],[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Getting a Task’s Hook, xTaskGetApplicationTaskTag ,[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Calling a Task Hook, xTaskCallApplicationTaskHook ,[object Object],[object Object],[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Lab2: Task Management ,[object Object],Amr Ali Abdel-Naby@2010 Introduction to FreeRTOS V6.0.5

Free FreeRTOS Course-Task Management

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Free FreeRTOS Course-Task Management

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