[ECOS]Strongarm rtc and oscr

[ECOS]Strongarm rtc and oscr

[Andrea Acquaviva]

Hi,

I want to measure eCos multi-threading energy costs. I use it on the
assabet board.
In order to measure context switch overhead, I need some infos about
timeslicing:

- the option CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS refers to 3.6864MHz
    clock ticks?

- How does eCos use real time clock (RTC) and operating system timer
(OSCR) of
    StrongARM 1110?

Andrea.

--
Ing. Andrea Acquaviva
D.E.I.S. - Universita' di Bologna
V.le Risorgimento, 2    40136 BOLOGNA (ITALY)
Tel: (+39) 051 20 93787 Fax: (+39) 051 2093786

Re: [ECOS]Strongarm rtc and oscr

[Jonathan Larmour]

Andrea Acquaviva wrote:
> 
> I want to measure eCos multi-threading energy costs. I use it on the
> assabet board.

Have you looked at the tm_basic kernel test?

> In order to measure context switch overhead, I need some infos about
> timeslicing:
> 
> - the option CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS refers to 3.6864MHz
>    clock ticks?

Yes.

> - How does eCos use real time clock (RTC) and operating system timer
> (OSCR) of
>     StrongARM 1110?

An interesting question because we are considering changing the way it
operates right now! The interesting part is in
hal/arm/sa11x0/var/current/src/sa11x0_misc.c and hal_clock_rest() and
hal_clock_read(). Currently it resets it to 0 each interrupt, but we may be
about to change it to make it a freerunning counter.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

Re: [ECOS]Strongarm rtc and oscr

[Andrea Acquaviva]

Jonathan Larmour wrote:

> Andrea Acquaviva wrote:
> >
> > I want to measure eCos multi-threading energy costs. I use it on the
> > assabet board.
>
> Have you looked at the tm_basic kernel test?
>
> > In order to measure context switch overhead, I need some infos about
> > timeslicing:
> >
> > - the option CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS refers to 3.6864MHz
> >    clock ticks?
>
> Yes.
>
> > - How does eCos use real time clock (RTC) and operating system timer
> > (OSCR) of
> >     StrongARM 1110?
>
> An interesting question because we are considering changing the way it
> operates right now! The interesting part is in
> hal/arm/sa11x0/var/current/src/sa11x0_misc.c and hal_clock_rest() and
> hal_clock_read(). Currently it resets it to 0 each interrupt, but we may be
> about to change it to make it a freerunning counter.
>
> Jifl
> --
> Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
> Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

Hi,

OK. I see that eCos uses oscr timer0 as a real time clock instead of RTC.

Now I'm looked at tm_basic test, and I have some additional questions:

- Can you explain me how the alarm_cb2 function is called? In the ref man
   I found that it should be the DSR routine defined in clock.cxx
   that calls the function which responds to an alarm. It's that right?

- When I want to install an rtc based alarm, what's the steps I must follow?

Thanks a lot for your help.
Andrea.

--
Ing. Andrea Acquaviva
D.E.I.S. - Universita' di Bologna
V.le Risorgimento, 2    40136 BOLOGNA (ITALY)
Tel: (+39) 051 20 93787 Fax: (+39) 051 2093786

Re: [ECOS]Strongarm rtc and oscr

[Jonathan Larmour]

Andrea Acquaviva wrote:
> 
> Now I'm looked at tm_basic test, and I have some additional questions:
> 
> - Can you explain me how the alarm_cb2 function is called? In the ref man
>    I found that it should be the DSR routine defined in clock.cxx
>    that calls the function which responds to an alarm. It's that right?

Yes.

> - When I want to install an rtc based alarm, what's the steps I must follow?

http://sources.redhat.com/ecos/docs-latest/tutorials/arm/ecos-tutorial.14.html#pgfId=1741808

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

[ECOS] Bluetooth on eCos - available

[Nilendu Pal]

Hi, 

Just wanted to let you know that "Wipro Technologies" has
a complete Bluetooth stack, running on eCos.  It includes the 
hardware baseband as well as the software stack.  

If any of your eCos projects need a bluetooth solution, send
us a mail, or visit this website. 

	Wipro Bluetooth
	http://bluetooth.wipro.com 

regards,
-Nilendu.