[Tinyos-devel] micaz (atm128?) serial problem in 2.x

[eweddington at cso.atmel.com]

Hi Phil,

I would rule out a stray memory bug causing the watchdog to be enabled.
On the mega128, it requires a specific code sequence to enable the
watchdog, which a stray memory bug probably won't be able to do.

IIRC, there is a register in the m128 that allows you to discover the
source of a reset. Sorry, I don't have the datasheet in front of me, so
I don't know the specific register. But I would suggest putting in some
debug code to take a look at that and see if that provides any further
clues.

HTH
Eric Weddington

----- Original Message -----
From: Philip Levis <pal at cs.stanford.edu>
Date: Monday, October 2, 2006 8:25 pm
Subject: [Tinyos-devel] micaz (atm128?) serial problem in 2.x

> This came up during net2's testing of collection. It looks like 
> when  
> a micaz app puts heavy load on the serial port (and there's lots of 
> 
> traffic) in 2.x, the mote can reboot. I don't know if this occurs  
> with the mica2. I don't believe this ever happens on just the 
> serial  
> bandwidth app, but this might be due to rate-limited 
> (send/sendDone)  
> vs. not-limited (multiple senders) load, interactions with the 
> radio,  
> or something which the semantics of that app just don't tickle.
> 
> I remember going through the atm128 manual and seeing the reboot  
> causes were pretty narrow. I was hard pressed to come up with a  
> reason why it might be happening, besides something really weird 
> like  
> a memory bug enabling the watchdog timer.
> 
> Has anyone else encountered this or have any insights?
> 
> Phil
> 
> 
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