[ECOS] Re: Timer mechanism
Thu Jan 15 11:55:00 GMT 2004
> >Ok, but why do I get a very big number, even if I execute the
> >cyg_current_time() when the eCos starts?
> What is the version of eCos your are using and on what type of HW ?
I'm using eCos 2.0 for a property MIPS target platform.
I have worked with Synthetic Target ant it works fine (as you suggest),
but when I use my Board I get a wrong value (I'll investigate).
> I just ran the following code on the synthetic target:
> while (1)
> diag_printf("%d\n", cyg_current_time());
> and the output is:
> after 10 seconds.
> >>The timing device is usually a hardware timer which can generate an
> >>interrupt after a
> >>specified amount of internal ticks. This timer gets initialized with
> >>which "is" 10ms (by default) in hw timer ticks. The HAL_CLOCK_READ macro
> >>the number of hw timer internal ticks elapsed since the last interrupt.
> >Is HAL_CLOCK_PERIOD the time between two interrupts or two internal
> HAL_CLOCK_PERIOD is the number of hw timer internal ticks between two RTC
> interrupts. And it is a platform dependent value, because it depends on
> the frequency of
> hw timer.
Therefore, after an amount of internal ticks a Interrupt is generated;
when the interrupt occurs, I think that will be named the
Cyg_RealTimeClock::ISR and the Cyg_RealTimeClock::DSR methods.
What do they do?
Thanks in advance.
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