RE: [ECOS] clock_settime() help

[Sam Pham <anhmn at yahoo dot com>]

Thanks for your response.  My application needs to
have timestamp of milli-seconds resolution.  Wallclock
is only seconds.


--- Jay Foster <jay.foster@systech.com> wrote:

> Perhaps you should use cyg_libc_time_settime()
> instead.  I have not had any
> problems using this to set the system time of day. 
> This does require a
> wallclock package to be included in your
> configuration
> (CYGPKG_IO_WALLCLOCK).  You can use the default
> wallclock emulation device.
> Jay
> 
> -----Original Message-----
> From: Sam Pham [mailto:anhmn@yahoo.com]
> Sent: Thursday, October 28, 2004 9:55 AM
> To: eCos Discuss
> Subject: [ECOS] clock_settime() help
> 
> 
> Hi all,
> 
> I'm having trouble with calling the clock_settime()
> function.  My application has the need of setting
> the
> clock to the current time.  At first, I called
> clock_settime() inside my ISR, and then outside of
> this ISR, I called clock_gettime() to verify if the
> current time was set.  I noticed that sometimes
> clock_settime() failed because clock_gettime()
> returned a non-current time value.  So I decided to
> call clock_settime() in a thread with all interrupts
> disabled by calling function
> cyg_interrupt_disable(). 
> However, I still observed the same failure as
> before.
> 
> Could anyone explain to me how I should be using
> function clock_settime()?  Its implementation is
> very
> simple - just change the counter value.  However, it
> looks like if the kernel is in certain states, then
> it
> won't allow anything to change this counter value.
> 
> Thanks.
> 
> 
> 		
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