[ECOS] changing the length of a tick
Fri Mar 1 01:34:00 GMT 2002
Jonathan Larmour wrote:
> Tom Coremans wrote:
> > Hi,
> > I`m trying to change the length of tick to 50 milli seconds with the
> > following code:
> > ________________________
> > cyg_handle_t rclock;
> > cyg_resolution_t res;
> > cyg_uint32 nsec_per_tick = 50000000;
> > res.dividend = nsec_per_tick;
> > res.divisor = 1;
> > rclock = cyg_real_time_clock();
> > cyg_clock_set_resolution(rclock,res);
> > _____________________
> > but when I run a test this doesn`t seem to work.
> > It seems there are still 100 ticks in a second, the default
> > configuration.
> > Does anybody know whats wrong with this?
> The configured resolution has to reflect what the clock actually does. In
> this case there is nothing that actually tells the clock hardware to do
> anything other than 100 ticks per second (10000000 ns/tick). It's just that
> now eCos will *think* when it got a tick that is 20 ticks per second.
> Look at how the kernel uses the HAL to configure the real hardware and do
> the same thing.
I have changed the resolution of the real time clock in the configtool under
an option concerning the hal and now it works fine and the tests run correct.
Is there a way to do this in the code of your application program?
And what do you accomplish by the fact that ecos *thinks* it got 20 ticks a
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