S12 / MagniV MicrocontrollersのトピックRe: Debug unused ISR using BGND instruction

Debug unused ISR using BGND instruction MC9S12XDP512

sbelanger — Sat, 26 Jul 2008 01:47:08 GMT

Hi,

For unused ISR, the Processor Expert will generate code with the following form :

/*
** ===================================================================
** Method : Cpu_PE_Cpu_PE_ivVsi (bean MC9S12XDP512_112)
**
** Description :
** The method services unhandled interrupt vectors.
** This method is internal. It is used by Processor Expert only.
** ===================================================================
*/
ISR(Cpu_PE_ivVsi)
{
asm(BGND);
}

I've tried many things like putting my own "assert" method call in the ISR with a regular breakpoint. It won't trigger if in an ISR.

I would like to know how can I set the Hiwave debugger to break on those BGND instruction?

Thanks

Added p/n to subject.

Message Edited by NLFSJ on 2008-07-28 08:47 AM

Re: Debug unused ISR using BGND instruction

JimDon — Sat, 26 Jul 2008 02:17:18 GMT

You can't put jmp some where the set a break point on somewhere?

Re: Debug unused ISR using BGND instruction

sbelanger — Sat, 26 Jul 2008 02:24:34 GMT

Well, I did the following to check if it would work :

ISR(Cpu_PE_ivVsi)
{
ASSERT_ALWAYS(0);
}

I've set a breakpoint in the ASSERT_ALWAYS() method. However the breakpoint won't trigger if the method is called within an ISR. Please note that if ASSERT_ALWAYS is called elsewhere than an ISR, the Hiwave debugger will halt the excecution and allow me to step into the code.

Re: Debug unused ISR using BGND instruction

JimDon — Sat, 26 Jul 2008 02:41:45 GMT

Not sure what that macro does, not sure what you mean by method.

About all that you can figure out from a unexpected interrupt is which one it was.

If you jump to some address (or perhaps call a "C" function) you will be able to set a break point there.

Re: Debug unused ISR using BGND instruction

sbelanger — Sat, 26 Jul 2008 02:46:47 GMT

Hi Don,

In fact the "ASSERT_ALWAYS()" macro is a wrapper for a C function that already has a breakpoint set on it. So if we hit an unexpected condition in our software, the assert function is called and the Hiwave debugger halts the execution right there.

For the previous case, I'm just wondering why a breakpoint set on a "C" function won't trigger if this function is called withing an ISR.

Re: Debug unused ISR using BGND instruction

JimDon — Sat, 26 Jul 2008 02:54:45 GMT

I see. Well as far as know there should not be an issue with a break point in an ISR on a function that is called.

You might try an asm jump to a function just to see if that does work. No need to pass any parameters, just set the break point at the top of the function.
I might also suggest that perhaps something else is a play here, and it is not an unexpected interrupt after all.
You didn't say much about the problem itself.

Re: Debug unused ISR using BGND instruction

sbelanger — Sat, 26 Jul 2008 03:00:21 GMT

Thanks for the reply Don.

The problem I'm facing is that during development some interrupts might occur and I would like to trap them with the Hiwave debugger. Having this, I might have a valid stack and be able to pinpoint from which area of the code the interrupt was triggered. This will enable me to find null pointers, floating point exception, page faults, etc...