Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


Stm34F4: Infinite_Loop after memset

Posted by Christoph on August 31, 2012
Hey. I am really not an expert, I am an hobbyist trying to work with FreeRTOS + STM32F4 (discovery board)
I managed to set up the toolchain (summon arm) and Eclipse IDE. "Plain" LED Blinking works fine.
I tried to add the FreeRTOS code to my project. I managed to compile the Source but when it comes to creating a task, I get stuck while debugging.

I fgured that eventually after 'memset' I end up in the "Infinite_Loop" trap in startup_stm32f3xx.S which is the processors handler for "unexpected interrupts".

Ehm ... I am lost. Totally.

These are the steps of my debugging session which lead to the trap.
main.c: xTaskCreate( testtask, ( signed char * ) "test", configMINIMAL_STACK_SIZE, NULL, mainQUEUE_RECEIVE_TASK_PRIORITY, NULL );
-> task.c(406): pxNewTCB = prvAllocateTCBAndStack( usStackDepth, puxStackBuffer );
-> -> task.c(2154): memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) usStackDepth * sizeof( portSTACK_TYPE ) );
-> -> -> startup_stm32f3xx.S(121): b Infinite_Loop


RE: Stm34F4: Infinite_Loop after memset

Posted by MEdwards on August 31, 2012
Have you installed the interrupt handlers?





RE: Stm34F4: Infinite_Loop after memset

Posted by Christoph on September 1, 2012

no I did not install the interrupt handlers correctly. Adding the #defines as mentioned in your linked threads did not solve the problem, however lead to some confusion (see below).

xTaskCreate() leads to a call of memset and strncpy in task.c (line 2154 and 1957) which then ends up in the handler for unexpected interrupts.
Reclessy removing those two calls from task.c worked, and two tasks are running as expected (as far as I can tell right now).
Of course thats not the way to go, so what is to blame for this problem?

There's one thing I don't get:
With and without the #defines for the interrupt handlers the code is working. Without it's slower, but a breakpoint in xPortSysTickHandler() is reached in both cases. Why is xPortSysTickHandler() called in both cases?


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

Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

Meet us at Embedded World. Hall 3A-525.

Hear from Richard Barry at Embedded World. Feb 28, 16:00, Hall 4-428.

Video: Watch James Gosling & Richard Barry at re:Invent, Las Vegas 2017.

FreeRTOS kernel V10.0.1 is available for immediate download. Now MIT licensed.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

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

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

OpenRTOS and SafeRTOS