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Re: problem about interrupt end


I think i have excluded the reason of repeating interrupt causing this problem...
I prolong the timer to a very big number..so I can see for the first timer interrput the breakdown occurs...
since the board and cpu is designed by ourself, I doubt if the assembly code for processing the interrupt needed to be modified(I refer to the code process :__defualt_intterrupt_vsr-->hal_interrupt_handlers-->isr--here code crashed))???is it possible?


thanks a lot

jet jiang

From: Nick Garnett <nickg@ecoscentric.com>
To: "jiang jet" <jetjiang@hotmail.com>
CC: ecos-discuss@ecos.sourceware.org
Subject: Re: [ECOS] problem about interrupt end
Date: 23 Nov 2006 09:43:34 +0000

"jiang jet" <jetjiang@hotmail.com> writes:

> thank you for answering my question...
> I trace the interrupt progress, and I found the number is changed when
> the code is going from assembly code to c code(call isr through
> hal_interrupt_handlers)..
> it's the first time for timer to interrupt and then the program breaks
> down..
> do you mean there are some other interrupts or the same intererupts
> happened during this period(from system bootup to the time of the
> first timer interrupt happening)?

It may be the same interrupt happening again. If the interrupt
condition has not been cancelled, it is possible for the interrupt to
be re-delivered as soon as interrupts are re-enabled. If this is
before the stack has been totally unwound, then it will chew its way
down the stack and on into other data.

Note that this is only a suggestion, I have no idea whether this is
what is actually happening in your case.


> and I adjust the stack size ,but it seems it doesn't work :(


It is unlikely that this will have any effect, the stack corruption
will chew up any size of stack very quickly.

--
Nick Garnett                                     eCos Kernel Architect
http://www.ecoscentric.com                The eCos and RedBoot experts


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