Timers in Eth board 1.3H

[Prasad.Nagapati]

Hi All,

I have many doubts regarding the Timer and counter in the Eth board.
Since I am very new to this area (Not the timer and counter :-) but in
the board level programming)

I want to measure the events in microseconds, so I need a much bigger
resolution timer. The nut OS Api's provides me only the time in
milliseconds.

Hence I request you to provide me the details of Timer1 and Timer2 which
is available to user and to configure them. I want to use them as
separately configuring the

registers and starting and stopping the timers. (As a low level driver),
please help me where can I get these details? And any examples of
configuring timers like this?

I went in NutWiki but if I click the samples I am not getting any
information even though I have logged in.

Please help me since I am very new in this area and just started to
using this board 1.3H

Thanks

Warm Regards
Prasad
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[Matthias Ringwald]

Hi

If you're using the standard nut/os configuration and are happy with  
30.5 us resolution, you can use btn_get_rtc() from here: http://btnode.cvs.sourceforge.net/viewvc/btnode/btnut/btnode/time/btn-time.c?revision=1.4&view=markup

m.

On 02.06.2009, at 10:48, <Prasad.Nagapati@...> wrote:

> Hi All,
>
> I have many doubts regarding the Timer and counter in the Eth board.
> Since I am very new to this area (Not the timer and counter :-) but in
> the board level programming)
>
> I want to measure the events in microseconds, so I need a much bigger
> resolution timer. The nut OS Api's provides me only the time in
> milliseconds.
>
> Hence I request you to provide me the details of Timer1 and Timer2  
> which
> is available to user and to configure them. I want to use them as
> separately configuring the
>
> registers and starting and stopping the timers. (As a low level  
> driver),
> please help me where can I get these details? And any examples of
> configuring timers like this?
>
> I went in NutWiki but if I click the samples I am not getting any
> information even though I have logged in.
>
> Please help me since I am very new in this area and just started to
> using this board 1.3H
>
> Thanks
>
> Warm Regards
> Prasad
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion

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[Dusan Ferbas]

Hi Prasad,

I used a prepared page title to store a code snippet to the NutWiki:
  http://www.ethernut.de/nutwiki/Timer_and_Counter_Interrupts.
This example shows how to setup timer1 for ms periods.

How exact microsecond period you need ?
If not too exact, use following calculations:
number_of_required_counts = 1/(period_ms/1000000)
freq_divisor = 14745600/number_of_required_counts
timer_divisor = 14745600/freq_divisor (rounded value if integer
arithmetics was used)


#define TIMER1_DIVISOR_20us             14745600/295    //NUT_CPU_FREQ/...
#define TIMER1_DIVISOR_50us             14745600/737

Note: For details look for TCCR1B register description (page 134 -
135 in ATmega128 data sheet).==========================
 >http://www.ethernut.de/nutwiki/Talk:Nut/OS_Examples

At 12:00 2.6.2009, you wrote:
 >From: <Prasad.Nagapati@...>
 >Date: Tue, 2 Jun 2009 16:48:37 +0800
 >Hi All,
 >
 >I have many doubts regarding the Timer and counter in the Eth board.
 >Since I am very new to this area (Not the timer and counter :-) but in
 >the board level programming)
 >
 >I want to measure the events in microseconds, so I need a much bigger
 >resolution timer. ...
 >I went in NutWiki but if I click the samples I am not getting any
 >information even though I have logged in.

Dusan  

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[Prasad.Nagapati]

 
Hi Dusan,

Thanks for the code snippet,

Now I have understood the timer functionality completely.

Since I want to measure time between two events, I will start the timer
at 1st event and stop it at the next event and count will give me the
exact time between the events.

I reffered the ATmega128 data sheet :-)

Thank you all again.

Regards
Prasad



-----Original Message-----
From: en-nut-discussion-bounces@...
[mailto:en-nut-discussion-bounces@...] On Behalf Of Dusan Ferbas
Sent: Wednesday, June 03, 2009 1:49 PM
To: en-nut-discussion@...
Subject: Re: [En-Nut-Discussion] Timers in Eth board 1.3H

Hi Prasad,

I used a prepared page title to store a code snippet to the NutWiki:
  http://www.ethernut.de/nutwiki/Timer_and_Counter_Interrupts.
This example shows how to setup timer1 for ms periods.

How exact microsecond period you need ?
If not too exact, use following calculations:
number_of_required_counts = 1/(period_ms/1000000) freq_divisor =
14745600/number_of_required_counts
timer_divisor = 14745600/freq_divisor (rounded value if integer
arithmetics was used)


#define TIMER1_DIVISOR_20us             14745600/295
//NUT_CPU_FREQ/...
#define TIMER1_DIVISOR_50us             14745600/737

Note: For details look for TCCR1B register description (page 134 -
135 in ATmega128 data sheet).==========================
 >http://www.ethernut.de/nutwiki/Talk:Nut/OS_Examples

At 12:00 2.6.2009, you wrote:
 >From: <Prasad.Nagapati@...>
 >Date: Tue, 2 Jun 2009 16:48:37 +0800
 >Hi All,
 >
 >I have many doubts regarding the Timer and counter in the Eth board.
 >Since I am very new to this area (Not the timer and counter :-) but in
 >the board level programming)
 >
 >I want to measure the events in microseconds, so I need a much bigger
 >resolution timer. ...
 >I went in NutWiki but if I click the samples I am not getting any
 >information even though I have logged in.

Dusan  

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