Microsecond Accurate Hardware timer

KickinAezz · Post by **KickinAezz** » Mon Oct 08, 2007 1:37 am

I saw the sample in Kernel/systimer... But that's not what I need.

Could anyone guide me towards what I need to keep track of time in Microseconds?

Thanks,

Post by **TyRaNiD** » Mon Oct 08, 2007 2:07 am

RTC? cop0 clock? surely others as well :)

KickinAezz · Post by **KickinAezz** » Tue Oct 09, 2007 1:40 am

RTC... OK

cop0 clock sounds interesting.. Any samples?

Art · Post by **Art** » Tue Oct 09, 2007 6:12 pm

did you find the resolution for systimer?
I thought it would be better than microseconds.

Just use the real time clock then.

kolaaaa · Post by **kolaaaa** » Tue Oct 09, 2007 9:36 pm

For example, I read cop0 counter using this code in kernel mode :

Code: Select all

int
getCycleCounter &#40;void&#41;
&#123;
        int value;
        __asm__ __volatile__&#40;
                "mfc0 %0, $9 \n"
                &#58; "=r" &#40;value&#41;&#41;;
        return value;
&#125;

Maybe there are a better way to do this ?

KickinAezz · Post by **KickinAezz** » Wed Oct 10, 2007 4:50 am

Art wrote:did you find the resolution for systimer?
I thought it would be better than microseconds.

Just use the real time clock then.

Using clock() now. Res: defined as CYCLES_PER_SEC = 1000000

Will also try cop0 example above.

Systimer? what?

Art · Post by **Art** » Wed Oct 10, 2007 8:41 am

You said in your first post you saw the sample for systimer.
It's tick resolution is unclear at best:
http://www.geardome.com/pspsdk-doc/pspsystimer_8h.html

Was asking did you figure out the tick resolution? I assume not...

KickinAezz · Post by **KickinAezz** » Wed Oct 10, 2007 10:06 am

Art wrote:You said in your first post you saw the sample for systimer.
It's tick resolution is unclear at best:
http://www.geardome.com/pspsdk-doc/pspsystimer_8h.htmlr

Was asking did you figure out the tick resolution? I assume not...

It needs a callback thread... I wouldn't bother.

Yes, How to find the MAX accurate resolution is unclear.

I'm fixed with clock() and it's very accurate with my stopwatch;

Thanks!