hi,all
now i have written a program which is used to detect body motion in MSP410.My program is a loop cycle, which every time is started by a timer and then run step by step ,at last wait another timer fired.
i downloaded my program and have done some experiments.
--1--
after several times experiment , i find a special and surprising phenomenon:
when my time is fired in 500ms which begin to repeat my program in 500ms , the data i get tell me that i just get nearly 2 times one per one second.It is nearly normal!
but when i change the timer in 100ms to fire ! what a surprise! i just get mean a little more than 4 times per second!! why ??who can help me to exlpain it ?? is it by reason of hardware ??
more surprising is that when timer is in 25ms , what i get is just similar to 100ms ,it is nearly 5 times per second!!
why ??who can help me to explain it ?? is it by reason of hardware ??
--2--
and could i get the system time of mica2( or MSP410)? so maybe i can get the runtime of my program??
--3--
in the MSP410's PIR.nc and PIRM.nc files , i find the PIR.IntEnable() and PIR.InterruptEvent() function. Any one could tell me what is their usage??when should i use them ??
best regards
--
祝好，此致
敬礼
Campbell
--------------------------------------------------------------------------------------------------------
SNARC
Sensor Networks and Application Research Center
http://snarc.gucas.ac.cn/index.htm
Our Mission
To be one of the best groups in the area of sensor networks research
, by successful completion of key projects
, publishing high quality papers and transferring technologies
and know-how to industries
--------------------------------------------------------------------------------------------------------
--
祝好，此致
敬礼
Campbell
--------------------------------------------------------------------------------------------------------
SNARC
Sensor Networks and Application Research Center
http://snarc.gucas.ac.cn/index.htm
Our Mission
To be one of the best groups in the area of sensor networks research
, by successful completion of key projects
, publishing high quality papers and transferring technologies
and know-how to industries
--------------------------------------------------------------------------------------------------------
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