[Tinyos-devel] Question about Msp430DcoCalibP

[Jan Hauer]

The problem is that currently TimerA is not correctly arbitrated and
interrupts are left enabled even if there is no client. Vlado, Kevin
and I have discussed this last friday and agreed on a solution which
we will soon commit to CVS.

Jan

On Thu, Feb 14, 2008 at 2:48 AM, Rodrigo Fonseca
<rfonseca at cs.berkeley.edu> wrote:
> Hi,
>
>  I instrumented a simple application that uses a timer in the Telos
>  platform, and I observe interrupt TIMERA1_VECTOR fire 16 times a
>  second with some small deviation.
>  My most likely suspect is the event TimerMicro.overflow() in Msp430DcoCalibP.
>
>  I have three questions that I am looking at, but it would be great if
>  someone can help me here:
>
>  1. Why is TIMERA1 firing 16 times a second?
>  2. Am I right to think that it's due to DCO calibration? (If this is
>  the case, the commend in Msp430DcoCalibP is wrong, as it says that it
>  will fire *32* times a second)
>  3. Is it always needed? (It seems that this is on whenever we use any
>  of the timers)
>
>  Thanks,
>  Rodrigo
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