Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Real time embedded FreeRTOS mailing list 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem TCP & FAT Training


Some task unexpected stops

Posted by sminder on August 15, 2014

I have a number tasks and they run fine as long as something does happen. Then some tasks has "Ready" state and highest priority but never executed, and some task have less priority but executed. The table of the states of tasks is given below:

TskNum  TskName     Prio    TskStatus 7       IDLE        0       Ready 5       taskbuf    2       Ready 1       taskkeys   3       Running 2       taskzb   4       Ready 8       Tmr Svc     4       Blocked 3       taskptt    3       Suspended 4       taskled    1       Suspended 6       taskusb    2       Suspended

I'm interested in a "taskzb" task which has a highest priority and the "Ready" state but never executed. At the same time the "taskkeys" task which has less priority running as well as an "IDLE" task (the "task_buf" task also never executed). That the problem?

P.S. RTOS port is ARM Cortex M3, version is 7.4.2

Some task unexpected stops

Posted by rtel on August 15, 2014

This is normally a symptom of incorrect interrupt priority assignments. I would recommend updating your FreeRTOS version, ideally to V8.0.1 (should just be a drop in replacement), but at least to one of the later V7.x.x versions, then ensure configASSERT() is defined. This is because the latest versions have additional assert calls specifically designed to trap interrupt priority issues.

You can also look through the My application does not run section of the FAQ to ensure you are also complying with the normal API usage requirements.


Some task unexpected stops

Posted by sminder on August 22, 2014

Thanks a lot for your advice! I just replaced my old RTOS version by a new one and I've got a great tool for the interrupt priority diagnosis so I found the problem.

[ Back to the top ]    [ About FreeRTOS ]    [ Sitemap ]    [ ]

Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.

Free TCP/IP and file system demos for the RTOS

Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists