Hi, Where can I find the ISR for each interrupt, e.g., SFD interrupt when a packet is received? Is it part of TinyOS implementation? Thanks.
On Wed, Aug 10, 2011 at 11:04 AM, Janos Sallai <[email protected]>wrote: > Have you thought of modifying each and every ISR routine to store (and > accumulate) the time spent serving interrupts? This accumulated value > should then be subtracted from the running time of the code snippet. > > I suggest that you directly read the counter registers in the ISRs > (vs. calling LocalTime.get(), which may have additional overhead). The > counter registers should not overflow more than once while the > interrupt handler is running. > > This gets a little tricky, though, if there are nested interrupts. > AFAIK it's only the ADC subsystem that uses nested interrupts on the > AVR platforms. If your application doesn't use the ADC, the above > simple solution would suffice. > > Janos > > > > On Tue, Aug 9, 2011 at 10:27 PM, Xiaohui Liu <[email protected]> wrote: > > Hi everyone, > > How can I measure the time for a snippet of code (e.g., a function call > > foo), either synchronous or asynchronous, to execute? > > A straight forward way can be: > > start_time = Call LocalTime.get(); > > foo(); > > end_time = call LocalTime.get(); > > (end_time - start_time) is regarded as the execution time of function > call > > foo(). However, asynchronous code can preempt foo() during its execution, > > thus (end_time - start_time) may be overestimation of foo()'s actual > > execution time. > > An alternative can be something like the following: > > disable interrupt; > > start_time = Call LocalTime.get(); > > foo(); > > end_time = call LocalTime.get(); > > enable interrupt; > > However, this can be problematic also if some critical interrupts (e.g., > > packet reception) occur when the interrupt is disabled. Can anyone have > some > > idea on how execution time can be measured without the above issues? Any > > help is appreciated. > > -- > > -Xiaohui Liu > > > > _______________________________________________ > > Tinyos-help mailing list > > [email protected] > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > -- -Xiaohui Liu
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