On Thu, 12 Aug 2010 15:46:51 +0530 wrote
>>2010/8/12 prakash srinivasan
>>
>> Deal All,
>> I am executing a simple for() loop and like to calculate the time period for
>> this loop. I used rt_timer_read(). As per the document, it mentioned that
>> rt_timer_read() returns the current time expressed in clock ticks. I could
>> not able to get an clear idea about it. Suppose if i convert it by using
>> rt_timer_ticks2ns(), I am not getting the proper output. My code is,
>> RTIME start, end;
>> ...
>> ...
>> start=rt_timer_read();
>> for()
>> {}
>> end=rt_timer_read();
>> printf(TOTAL LOOP TIMING=%ld usn",
>> (long)((rt_timer_ticks2ns(end-start))/1000);
>>
>> I would like to convert the ticks into nano seconds first and then into
>> micro seconds. The final result is irrelevant. I am not sure, where is the
>> issue. Help me to find the timings details properly.
>Irrelevant how? Not repeatable?
Early I gave (long)(start). The output was in negative.
>What are the printed values?
>Did you try without rt_timer_ticks2ns first?
Output without rt_time_ticks2ns()::
printf("Starting time: %ld\n",(long)start);
Starting time: 445465374
printf("End time: %ld\n",(long)end);
End time: 927680697
printf (Difference time:%ld\n",(long)(end-start))
Difference time: 482215323
Output with rt_timer_ticks2ns()::
printf("Starting time: %ld\n",(long)rt_timer_ticks2ns(start));
Starting time: -2090279950
printf("End time: %ld\n",(long)rt_timer_ticks2ns(end));
End time: -1168915612
printf (Difference time:%ld\n",(long)rt_timer_ticks2ns(end-start))
Difference time: 921364338
whether my call is correct, (long) rt_timerticks2ns(end-start)?
-Prakash_______________________________________________
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