On Jan 21, 2007, at 7:33 PM, Nick Soldner wrote:
Hello,
I am using Tinyos-1.x with a MicaZ mote and trying to measure RSSI
at high rates, I've posted about this before and am slowly getting
closer to my goal. Right now when I use TimerC, I am unable to get
a measurement any faster than 4ms. Clearly I'm running into a
limitation of TimerC or need to modify something or use another
timing function (should I use AlarmC?)
Here is the relevant code:
command result_t StdControl.start() {
// Start a repeating timer that fires every 1000ms
return call Timer.start(TIMER_REPEAT, 1);
}
basically what happens is the timer simply doesn't work, i.e.
Timer.fired() isn't triggered. I'm trying to understand why this
happens, is it linked to the micaz's timer or what is it that
limits TimerC from going much faster than 4ms.
Thanks,
Please check the archives; the TinyOS 1.x timer won't fire faster
than every 3ms due to how the atmega128 hardware works. If you check
the return value of the call to Timer.start() you will find it is FAIL.
Phil
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