[Tinyos-host-mote-wg] Re: [Tinyos-2.0wg] Timer.fired

[Cory Sharp]

On 5/23/05, Philip Levis <pal at cs.berkeley.edu> wrote:
> On May 23, 2005, at 11:30 AM, Cory Sharp wrote:
> Ah, OK. I think I understand. Your description is a little unclear.
> If I have it wrong, let me know and I'll just look at the code. The
> state it keeps is "last time I fired." From this it can determine how
> many firings remain, up to time wraparound, etc.?

Yeah, I opted for brevity over verbose clarity.  You've got it pretty
much right.

Note that there are five pieces of state per timer that you just must have:

    uint8_t id
    uint32_t t0
    uint32_t dt
    bool is_periodic
    bool is_running

id isn't kept around because it's implicit in the wiring/indexing. 
t0+dt is when a timer will or did fire ("last time I fired"). 
Everything is calculated from those five state values.  You can look
at the code in tos/lib/timer/VirtualizeTimerC.nc -- there's not a
whole lot of code there.

Cory

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