[Tinyos-host-mote-wg] Re: [Tinyos-2.0wg] proposed mica timer changes

[Joe Polastre]

It is used to get precise timing on one-wire devices.  If it hasn't
been implemented yet, it should be.

-Joe

On 10/21/05, Phil Buonadonna <pbuonadonna at archedrock.com> wrote:
> This seems fine.
>
> What about busywait?  It's required by the TEP, but I don't see it in any of
> the implementations.  Is this 'going away'?
>
> pb
>
>
> > -----Original Message-----
> > From: tinyos-2.0wg-bounces at Mail.Millennium.Berkeley.EDU
> > [mailto:tinyos-2.0wg-bounces at Mail.Millennium.Berkeley.EDU] On
> > Behalf Of David Gay
> > Sent: Friday, October 21, 2005 3:22 PM
> > To: tinyos2 group
> > Subject: [Tinyos-2.0wg] proposed mica timer changes
> >
> > Based on my many days of fighting T2 on mica2 weirdnesses+performance
> > issues, I'd like to propose the following changes to the T2 atmega128
> > subsystem:
> >
> > - HplTimer0C becomes HplTimer0AsyncC and has weird hacks to defeat
> > ATmega128 weirdnesses. You'll all be happy to know this requires one
> > byte of state ;-) In a semi-ideal world, they'd also be an HplTimer0C
> > for those using timer 0 in non-async (i.e., not the external 32kHz
> > crystal) mode, but I doubt there's much need for it.
> >
> > - Atm128Capture/Alarm/CounterP become Atm128Capture/Alarm/CounterC -
> > these aren't private components.
> >
> > - AlarmCounter32khzC and AlarmCounterMilliC are two ways of using the
> > atmel's 8-bit timer 0 w/ 32kHz crystal. You can't use both (not
> > enforced). They provide the Alarm, Counter and Localtime interfaces in
> > 32-bit forms, at 32kHz or 1kHz.
> >
> > - TimerMilliC is the standard 1kHz timer, built on
> > AlarmCounterMilliC (for now)
> >
> > - Timer32khzC is temporarily gone - it didn't work as it was trying to
> > use the same alarm as TimerMilliC. Ultimately, if we want this, we'll
> > have to do some sharing of the alarm with TimerMilliC as there's only
> > one compare register (the best solution would seem to be a hacked
> > version of VirtualiseTimerC which can virtualise to two different
> > rates - I'll look into this after pldi).
> >
> > All this requires a TransformAlarmCounterC component to be
> > added to lib/timer.
> >
> > David
> >
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> >
> >
>
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