Difference between revisions of "FreeRTOS"

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[[Main_Page|Wiki Main Page]] | [[User:Ted#.5E_Linux_Packages|User Page of Ted]] | [https://www.google.com Google search engine]
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<font size="4">
 
FreeRTOS notes<br />
 
FreeRTOS notes<br />
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operating system used and recommended by Neil M.<br />
 
operating system used and recommended by Neil M.<br />
 
2017-12-08
 
2017-12-08
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== Overview ==
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Ted starting a wiki page to hold notes and findings from working through demos and tutorials on FreeRTOS operating system.  First goals include:
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*  Learning what target CPUs, dev boards and systems run FreeRTOS
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*  Learning what emulators run and support testing of FreeRTOS instances
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<!-- comment -->
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== [[#top|^]] First Topics Explored ==
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RTOS fundamentals covered in pages of FreeRTOS site:
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*  https://www.freertos.org/implementation/a00002.html
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These initial links will likely be moved or removed, they're just first places Ted checked out at FreeRTOS site:
  
 
*  https://www.freertos.org/rtos-trace-macros.html
 
*  https://www.freertos.org/rtos-trace-macros.html
 
*  https://freertos.org/a00110.html#configASSERT
 
*  https://freertos.org/a00110.html#configASSERT
  
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- 2017-12-27 WED -
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FreeRTOS demo applications described in overview fashion at https://www.freertos.org/a00102.html.
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*  https://www.freertos.org/a00017.html . . . source code organization,
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*  https://www.freertos.org/a00090.html . . . FreeRTOS ports, each its own web page,
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- 2018-05-11 FRI -
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Quick-start page and configAssert():
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*  https://www.freertos.org/a00110.html#configASSERT
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<!-- comment -->
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== [[#top|^]] FreeRTOS Ported To Microcontroller Families ==
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- 2017-12-15 FRI -
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FreeRTOS ports to various microcontroller families:
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*  https://www.freertos.org/a00090.html
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*  https://www.freertos.org/FreeRTOS-for-Cortex-M0-LPC1114-LPCXpresso.html NXP LPC1114 ARM Cortex-M0 Demo
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*  https://www.freertos.org/FreeRTOS-for-STM32F4xx-Cortex-M4F-IAR.html
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<!-- comment -->
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== [[#top|^]] Specific Boards Usable with FreeRTOS ==
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2018-04-10
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Singleton Pattern mentioned in section named "Basics" in the following wiki document about San Jose State University LPC1758 dev board:
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*  http://socialledge.com/sjsu/index.php/SJ_One_Board
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**  http://socialledge.com/sjsu/index.php/Main_Page
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**  http://socialledge.com/sjsu/images/d/de/2012SJOneBoardSchematic.pdf
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*  https://www.freertos.org/FreeRTOS-Plus/BSP_Solutions/ST/index.html
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**  https://www.freertos.org/FreeRTOS-Plus/BSP_Solutions/ST/STM32Cube.html#examples
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*  https://www.freertos.org/FreeRTOS_Support_Forum_Archive/April_2010/freertos_STM32F10X-128k-Eval_freeRTOS_V6.0.4_OK_3669009.html
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*  https://github.com/atgreen/FreeRTOS/tree/master/Demo/CORTEX_STM32F100_Atollic
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<!-- # # # Trouble-shooting Related Notes Follow # # #
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&num; # # Trouble-shooting Related Notes Follow # # # -->
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&#35; # # Trouble-shooting Related Notes Follow # # #
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<!-- comment -->
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== [[#top|^]] FreeRTOS Architecture ==
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Context switchting, how context switched between tasks in FreeRTOS . . .
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*  https://www.freertos.org/implementation/a00003.html
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*  https://www.freertos.org/implementation/a00011.html
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Task Control Block (TCB) memory allocation . . .
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*  https://www.freertos.org/FreeRTOS_Support_Forum_Archive/January_2018/freertos_Task_control_block_memory_allocation_55c3c1a5j.html
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Task priorities assignable defined in tasks.h:
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<pre>
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~/Downloads/freertos/FreeRTOSv10.0.1/FreeRTOS/Source$ grep -nr tskIDLE_PRIORITY ./*
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./include/task.h:154:#define tskIDLE_PRIORITY ( ( UBaseType_t ) 0U )
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./include/task.h:307: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, &ucParameterToPass, tskIDLE_PRIORITY, &xHandle );
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./include/task.h:423:                      tskIDLE_PRIORITY,// Priority at which the task is created.
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./include/task.h:688: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
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./include/task.h:856: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
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./include/task.h:861: // It was created with tskIDLE_PRIORITY, but may have changed
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./include/task.h:863: if( uxTaskPriorityGet( xHandle ) != tskIDLE_PRIORITY )
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./include/task.h:988: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
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./include/task.h:993: vTaskPrioritySet( xHandle, tskIDLE_PRIORITY + 1 );
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./include/task.h:998: vTaskPrioritySet( NULL, tskIDLE_PRIORITY + 1 );
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./include/task.h:1030: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
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./include/task.h:1079: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, &xHandle );
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./include/task.h:1154: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
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./include/task.h:1208: xTaskCreate( vTaskCode, "NAME", STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
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./queue.c:2031: uxHighestPriorityOfWaitingTasks = tskIDLE_PRIORITY;
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</pre>
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<!-- comment -->
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== [[#top|^]] Task Control Block - TCB ==
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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:
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*  https://www.freertos.org/FreeRTOS_Support_Forum_Archive/December_2012/freertos_pxCurrentTCB_corrupted_6477695.html
  
  
 
<!-- comment -->
 
<!-- comment -->
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== [[#top|^]] Memory Management and Heap ==
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https://stackoverflow.com/questions/58746081/how-do-i-select-a-memory-allocation-implementation-heap-c-file-in-freertos
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<!-- comment -->
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== [[#top|^]] Software Timers ==
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<ul>
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*  https://www.freertos.org/RTOS-software-timer.html
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*  https://mcuoneclipse.com/2018/05/27/tutorial-understanding-and-using-freertos-software-timers/
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</ul>
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Useful forum post regarding xTaskGetTickCount():
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2020-07-20
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*  https://www.freertos.org/FreeRTOS_Support_Forum_Archive/September_2018/freertos_Measure_Time_within_a_Task_with_xTaskGetTickCount_6d2307a0j.html
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<!-- comment -->
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== [[#top|^]] References ==
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*  https://www.freertos.org/History.txt . . . change history in text format gives a list of FreeRTOS stable releases
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*  https://www.freertos.org/a00104.html . . . source code download instructions
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2018-06-08 - Friday
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*  http://www.aosabook.org/en/freertos.html
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<!-- comment -->
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[[#top|- - - top of page - - -]]
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</center>
  
  
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Latest revision as of 18:14, 19 September 2022

Wiki Main Page | User Page of Ted | Google search engine



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


- - - top of page - - -


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