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


Hang issue

Posted by Ananda Kumar B on April 18, 2011
Can anyone tell me, what could be the reason for the "pxIterator->pxNext->xItemValue " which is always less than the "xValueOfInsertion" as mentioned in the list.c file... which leads to the crash
for( pxIterator = ( xListItem * ) &( pxList->xListEnd ); pxIterator->pxNext->xItemValue <= xValueOfInsertion; pxIterator = pxIterator->pxNext )

RE: Hang issue

Posted by Richard on April 18, 2011
Um...I think you and I are already discussing this in another thread, aren't we?


RE: Hang issue

Posted by Ananda Kumar B on April 19, 2011
Yes true... That is specific to the application hang issue..
But I am interested to know about the internals like what can make the application to make the "pxIterator->pxNext->xItemValue" always lesser than the "xValueOfInsertion"

Can you please specify that?

RE: Hang issue

Posted by Dave on April 19, 2011
I think that line in the source file has a comment above it that states 3 or 4 causes of that, all of which are user errors, not FreeRTOS errors. The simplest cause can be just an ordinary stack overflow. Do you have stack overflow checking on in the configuration?

RE: Hang issue

Posted by Ivan on April 29, 2011
Yes, I was just about to suggest the Stack Overflow issues. This is the most common problem on the RX62N FreeRTOS v7 that I have.

I'm working on a very tight RAM memory for my application and memory budgeting for each Task is critical. You might want to look into that as well. Especially when considering the minimum amount of Stack Space that you need to keep as a buffer for a context switch to occur. This is specific to your port that you're using.

Hope it help.


RE: Hang issue

Posted by Richard on April 29, 2011
Depending on which compiler you are using, the C library functions can take up a *lot* of stack (things like sprintf(), etc.). If you only need basic printf() type functionality then consider using the printf-stdarg.c file that you will find included in many of the FreeRTOS demos instead of the standard C library version. It is extremely light weight in comparison.


[ 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