Oh, now here is an interesting bit of trivia....
TimerC overflows a 16bit count every 2 sec.
But the interface has a resolution of 1ms,
and there has been talk about what the max
timeout when using the i/f is?
And the lack of wiring vs not including in
the config file...hmmm? Is the Timer always
started in StdControl.init() even if not used?
I've probably missed a really important piece
of documentation...Can you elucidate a bit?
thx
MS
Cory Sharp wrote:
None of the drivers in TinyOS are written to be able to sustain a task
taking long seconds or more to complete. Blocking the task queue for
a long time is bad. Read the discussion pointed to my Michael. You
must split your long task into multiple tasks, each task incrementally
doing more processing.
For the MSP430 TimerC in particlar, every two seconds, for each
overflow of a 32khz 16-bit counter, a task is posted to process that
overflow. The current overflow MUST be processed before the next
overflow occurs.
For a healthy, reactive system, I recommend no one task take longer
than, say, tens of milliseconds to complete.
Cory
On 2/5/06, Matt Thompson <[EMAIL PROTECTED]> wrote:
Hi,
It appears that TimerC is filling the task queue while a long task is
running (ie Elliptic Curve DSA signature verification). After the ECDSA
task completes, the telosb is unable to process any more tasks. Is
there a way to stop the timer from posting tasks before a long operation
is started? It seems that even if I do not start the timer (and it is
not wired to StdControl), the task queue still fills up. I have to
completely remove it from the configuration for this behaviour to disappear.
Why does the mote not continue to process the task queue after the long
task completes, and then allow me to post more tasks when some of them
have completed?
Has anyone else expereienced similar behaviour?
Cheers,
Matt
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