[Contiki-developers] MSP430 watchdog mode (was: Re: MSP430 watchdog_start()/watchdog_stop() in TimerA vectors)

[Oskar N. <osk...@cr...>]

Hello,

While what you are saying is true, the watchdog will not work in ISR:s
for MSP430 platforms. The reason for this is that the watchdog is
configured in timer interval mode which generates interrupts. This means
watchdog will not reset CPU when hanged in an interrupt vector unless
nested interrupts are enabled.

>From what I can see, the timer interval mode is only used to print a
stack trace on the TMote Sky. We propose that the watchdog should be in
watchdog mode by default.

Best regards,
Oskar

On Mon, 2011-09-26 at 14:15 +0200, Joakim Eriksson wrote:
> Hello,
> 
> This is handled by the counter in watchdog.c. So the call to
> start does not actually start it if it already is started and
> vice versa (with stop).
> 
> Best regards,
> -- Joakim Eriksson, SICS
> 
> 
> Oskar Nordquist skrev 2011-09-26 11:20:
> > Hi,
> > This question is really directed directly to Adam, so excuse me for
> > CC:ing you directly. I just think it is important.
> >
> > In cpu/msp430/{clock,rtimer_arch}.c, the TimerA vectors now starts and
> > stops the watchdog. I understand from Sky and Z1 platforms that this is
> > because you want the watchdog to be enabled during TimerA interrupts
> > during LPM (as watchdog is disabled in LPM).
> >
> > My question is: What happens when TimerA interrupts occurs when *not* i
> > LPM? Would this not result in the watchdog being inactive upon return?
> >
> > Best regards,
> > Oskar
> >
> >
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