[Tinyos-devel] strange behaviour in turning the radio on and off on MicaZ in tinyos-2.x

[Razvan Musaloiu-E.]

Hi!

On Wed, 28 Jun 2006, Jonathan Hui wrote:

> After some testing, I noticed that the FIFOP interrupt was firing
> prematurely on the micaz platform (right after enabling the FIFOP
> interrupt). I've changed the atm128 GPIO interrupt implementation to
> disable and clear interrupt flag before setting the interrupt sense
> control and enabling interrupts again. This seems to have solved the
> issue with the node freezing in your simple test app. See if it makes
> any difference in your full app.

Yup, the fix also works for my full appplication. Super thanks! :-)

--
Razvan ME

> On 6/28/06, Philip Levis <pal at cs.stanford.edu> wrote:
> > On Jun 28, 2006, at 6:15 PM, Razvan Musaloiu-E. wrote:
> >
> > > Hi!
> > >
> > > I noticed a strange behavior when the radio is turned on and off on a
> > > MicaZ. The observable thing is that the mote resets itself on the second
> > > attempt to turn the radio on. I attached a program that
> > > demonstrates this.
> > > The program has a component (MyLocalTime) that blinks the red led very
> > > fast and another one (RadioControl) that turns the radio on and off. When
> > > the radio is turned on for the second time the red led freezes for a few
> > > moments and the green one is quickly turned off and then back to on (which
> > > means the counter maintained by the blinking component was reset to0).
> > >
> > > There are two implementation of the RadioControlP: one that turns the
> > > radio on and off (_off) and one that doesn't (_nooff). The ./off and
> > > ./nooff will make the proper symlink.
> > >
> > > Could someone test this? :-)
> > >
> > > Notes: on TelosB the program runs correctly. I'm using the latest CVS of
> > > tinyos-2.x.
> > >
> > > Thank you!
> > > Razvan ME
> >
> > This is interesting. The net2 group has recently been testing its
> > collection code and has seen similar behavior, even though the radio
> > is not powered on and off. Telos nodes behave fine, but micaz nodes
> > seem to periodically reboot. I've forwarded your message along to
> > Jonathan Hui (the author of the CC2420 stack) and will take a look.
> >
> > Phil
> >
>