FreeRTOS

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FreeRTOS notes
operating system used and recommended by Neil M.
2017-12-08



Overview

Ted starting a wiki page to hold notes and findings from working through demos and tutorials on FreeRTOS operating system. First goals include:

  • Learning what target CPUs, dev boards and systems run FreeRTOS
  • Learning what emulators run and support testing of FreeRTOS instances



^ First Topics Explored

RTOS fundamentals covered in pages of FreeRTOS site:


These initial links will likely be moved or removed, they're just first places Ted checked out at FreeRTOS site:


- 2017-12-27 WED - FreeRTOS demo applications described in overview fashion at https://www.freertos.org/a00102.html.

- 2018-05-11 FRI - Quick-start page and configAssert():


^ FreeRTOS Ported To Microcontroller Families

- 2017-12-15 FRI -

FreeRTOS ports to various microcontroller families:


^ Specific Boards Usable with FreeRTOS

2018-04-10

Singleton Pattern mentioned in section named "Basics" in the following wiki document about San Jose State University LPC1758 dev board:


# # # Trouble-shooting Related Notes Follow # # #



^ FreeRTOS Architecture

Context switchting, how context switched between tasks in FreeRTOS . . .

Task Control Block (TCB) memory allocation . . .

Task priorities assignable defined in tasks.h:

~/Downloads/freertos/FreeRTOSv10.0.1/FreeRTOS/Source$ grep -nr tskIDLE_PRIORITY ./*
./include/task.h:154:#define tskIDLE_PRIORITY			( ( UBaseType_t ) 0U )
./include/task.h:307:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, &ucParameterToPass, tskIDLE_PRIORITY, &xHandle );
./include/task.h:423:                      tskIDLE_PRIORITY,// Priority at which the task is created.
./include/task.h:688:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
./include/task.h:856:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
./include/task.h:861:	 // It was created with tskIDLE_PRIORITY, but may have changed
./include/task.h:863:	 if( uxTaskPriorityGet( xHandle ) != tskIDLE_PRIORITY )
./include/task.h:988:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
./include/task.h:993:	 vTaskPrioritySet( xHandle, tskIDLE_PRIORITY + 1 );
./include/task.h:998:	 vTaskPrioritySet( NULL, tskIDLE_PRIORITY + 1 );
./include/task.h:1030:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
./include/task.h:1079:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
./include/task.h:1154:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
./include/task.h:1208:	 xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
./queue.c:2031:			uxHighestPriorityOfWaitingTasks = tskIDLE_PRIORITY;


^ Task Control Block - TCB

Exploring the Task Control Block and stack implementations of FreeRTOS. Following forum post mentions stack checking as a feature of FreeRTOS 7.1 which can be enabled. This post also mentions interrupt priorities which range from 1 to 15:


^ Memory Management and Heap

https://stackoverflow.com/questions/58746081/how-do-i-select-a-memory-allocation-implementation-heap-c-file-in-freertos


^ Software Timers

Useful forum post regarding xTaskGetTickCount(): 2020-07-20


^ References

2018-06-08 - Friday


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