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




Loading

can't create/run new task in demo

Posted by biker126 on September 14, 2007
hi everyone

i've successfully installed the "ethernet demo" for eclipse / gcc and the LPC2368. however, when i m trying to implement my own simple task (it does nothing but incrementing and resetting a counter variable) openOCD crashes a few seconds after flashing with:

Error: armv4_5.c:186 armv4_5_mode_to_number(): invalid mode value encountered
Error: arm7_9_common.c:1075 arm7_9_debug_entry(): cpsr contains invalid mode value - communication failure
Error: target.c:1157 handle_target(): couldn't poll target, exiting

so i can't even start a GDB session to debug the program...

could anyone give me some beginners tips on what i have to focus when implementing my own code for freeRTOS?

RE: can't create/run new task in demo

Posted by Dave on September 14, 2007
I presume you can successfully run the demo as it is in the download without any modification?

main() creates a lot of standard demo tasks. In some of the demos these tasks use up all the available RTOS heap. The size of the heap being set by parameter configTOTAL_HEAP_SIZE within FreeRTOSConfig.h. If you run out of memory then try starting the scheduler the call to vTaskStartScheduler() will simply return and you will run off the bottom of main().

Try preventing some of the standard demo tasks from being created so you have RAM left over to create your own task. Also try placing a null loop (while(1)) after vTaskStartScheduler() within main() so you can see if the function returns.

RE: can't create/run new task in demo

Posted by biker126 on September 15, 2007
i think you are probably right (with the "not enough memory") as in some cases (when i can debug the demo) the program indeed ends up in and asm-endless-loop which is reached as far as i know by the "return 0" in main() (after the startscheduler() ).

could it also have something to do with a wrong memory map/linker script file?


[ 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