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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [May 2006 Threads] Unscheduled Scheduler StoppagePosted by John W. on May 16, 2006 Richard,
After my target runs for awhile - I get a stoppage:
My call stack looks like this:
main() prvIdleTask(_A_IE1(0x0) [PC=Memory:0x3082]
In main: ... vTaskStartScheduler();
// shouldn't get past this point unless a task calls vTaskEndScheduler()
// Note - I have a breakpoint on this first NOOP but it doesn't stop there __no_operation(); __no_operation(); while (1) { __no_operation(); __no_operation(); // I have a breakpoint on the 2nd NOOP (just above) and the debugger stops here.
// turn Debug LED's on: asm("bis.b #0x80,&0x1d"); asm("bis.b #0x01,&0x1d"); }
I run the Idle Hook as well - this (crash) doesn't always happen either - but I assume all of my targets will eventually fail.
What are some reasons this can happen? I know this may seem a bit nebulous - but the Scheduler is exiting (even though the vTaskEndScheduler() function) - isn't being called.
It seems that somehow the return address from the vTaskStartScheduler(); call is getting popped into the PC and executed - or at least an address+2 or something.
From my linker map file:
DATA16_Z Relative segment, address: 3082 - 3085 (0x4 bytes), align: 1 Segment part 5. Intra module refs: pvPortMalloc LOCAL ADDRESS ===== ======= xEnd 3082
I'm using heap_2.c as my memory manager:
/* xEnd is used to mark the end of the list of free blocks. */
I'm also saying that the IdleTask & Hook should yield - it seems this problem may be occurring during that.
Thanks In Advance, John W.
RE: Unscheduled Scheduler StoppagePosted by Nobody/Anonymous on May 16, 2006 I understand not the sentense "I'm also saying that the IdleTask & Hook should yield". The idle task must always be in a ready state and not blocked so just yield must be ok. Sorry to state obvious but sometimes it can help. Otherwise is the idle task stack causing a problem under some interrupt conditions?
RE: Unscheduled Scheduler StoppagePosted by John W. on May 16, 2006 Idle task doesn't block - correct.
I think the Idle Task Stack may be causing a problem under some interrupt conditions - yes.
Thanks, John
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