| Author |
Message |
Roman Mashak
Guest
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 Posted:
Tue Dec 07, 2004 12:29 pm Post subject:
Atmega162: to check the Timer0 ticking |
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Hello, All!
When I initialize Timer0/1, how can I check amount of time spent by timer
ticking, for example, if timer is configured for 10ms, how can I verify that
10ms really have gone. I suppose, I can attach probe of oscilloscope to
pin1 of ATmega162 (according to datasheet it's OC0), but I don't see
anything. Here is my code:
....
// ISR for Timer0
SIGNAL(SIG_OUTPUT_COMPARE0)
{
LED0_blink(); //my function
/*
Timer/Counter0 initialization
CLock source: system clock
Prescaler value: 8
Clock value:
Mode: increment CTC top=OCR0
Interrupt: enable
*/
void Timer0_Init(void)
{
TCCR0 = 0x00; //stop timer
TCNT0 = 0x00;
TCCR0 = _BV(CS01) | _BV(WGM01);
OCR0 = 0xFF;
TIMSK = _BV(OCIE0);
}
int main(void)
{
Timer0_Init();
sei();
while (1)
{
..........
}
return 1;
}
With best regards, Roman Mashak. E-mail: mrv@tusur.ru |
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Leon Heller
Guest
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| Posted:
Tue Dec 07, 2004 4:44 pm Post subject:
Re: Atmega162: to check the Timer0 ticking |
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"Roman Mashak" <mrv@tusur.ru> wrote in message
news:cp3m57$drb$1@mpeks.tomsk.su...
| Quote: | Hello, All!
When I initialize Timer0/1, how can I check amount of time spent by timer
ticking, for example, if timer is configured for 10ms, how can I verify
that 10ms really have gone. I suppose, I can attach probe of oscilloscope
to pin1 of ATmega162 (according to datasheet it's OC0), but I don't see
anything. Here is my code:
|
I'd use the simulator. The CPU has a stopwatch option.
Leon |
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Roman Mashak
Guest
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| Posted:
Tue Dec 07, 2004 5:50 pm Post subject:
Re: Atmega162: to check the Timer0 ticking |
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Hello, Leon!
You wrote on Tue, 7 Dec 2004 11:44:07 -0000:
??>> When I initialize Timer0/1, how can I check amount of time spent by
??>> timer ticking, for example, if timer is configured for 10ms, how can I
??>> verify that 10ms really have gone. I suppose, I can attach probe of
??>> oscilloscope to pin1 of ATmega162 (according to datasheet it's OC0),
??>> but I don't see anything. Here is my code:
LH> I'd use the simulator. The CPU has a stopwatch option.
Could you please explain how to use this feature of simulator? I guess, I
need to set up breakpoint for function I'm going to check, then run, after
reaching breakpoint zero'ing stopwatch option, then run again? Hm...
With best regards, Roman Mashak. E-mail: mrv@tusur.ru |
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Leon Heller
Guest
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| Posted:
Tue Dec 07, 2004 9:39 pm Post subject:
Re: Atmega162: to check the Timer0 ticking |
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| Quote: |
LH> I'd use the simulator. The CPU has a stopwatch option.
Could you please explain how to use this feature of simulator? I guess, I
need to set up breakpoint for function I'm going to check, then run, after
reaching breakpoint zero'ing stopwatch option, then run again? Hm...
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I'm using AVR Studio 4.10.
In Debug mode, select the I/O Workspace tab and open Processor. You should
see a Stop Watch at the bottom. Right click on it and you will find lots of
options. I run to a breakpoint, reset it, then run again to the breakpoint,
or a second breakpoint, to get accurate timings. You need to set the correct
clock rate for the simulator, of course. It should do what you want. You
could use a 'scope as well, just to make sure.
Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller
http://www.kasamba.com/viewExpert.asp?conMemID=105725&Catid=1111&banID=2100 |
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Roman Mashak
Guest
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| Posted:
Wed Dec 08, 2004 4:49 am Post subject:
Re: Atmega162: to check the Timer0 ticking |
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Hello, Leon!
You wrote on Tue, 7 Dec 2004 16:39:28 -0000:
LH> I'm using AVR Studio 4.10.
i'm using 4.8 build 310
LH> In Debug mode, select the I/O Workspace tab and open Processor. You
LH> should see a Stop Watch at the bottom. Right click on it and you will
LH> find lots of options. I run to a breakpoint, reset it, then run again
LH> to the breakpoint, or a second breakpoint, to get accurate timings. You
LH> need to set the correct clock rate for the simulator, of course. It
LH> should do what you want. You could use a 'scope as well, just to make
LH> sure.
I've done everything you said, and got the following effect: after I reached
the breakpoint 'stopwatch' value is changed and quickly resets to 0, so I
have no time to see the value.
And I didn't find where to change simulator frequency, though I see its
value in Processor window.
LH> Leon
With best regards, Roman Mashak. E-mail: mrv@tusur.ru |
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Roman Mashak
Guest
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| Posted:
Wed Dec 08, 2004 9:40 am Post subject:
Re: Atmega162: to check the Timer0 ticking |
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Hello, Leon!
You wrote on Tue, 7 Dec 2004 16:39:28 -0000:
LH> In Debug mode, select the I/O Workspace tab and open Processor. You
LH> should see a Stop Watch at the bottom. Right click on it and you will
LH> find lots of options. I run to a breakpoint, reset it, then run again
LH> to the breakpoint, or a second breakpoint, to get accurate timings. You
LH> need to set the correct clock rate for the simulator, of course. It
LH> should do what you want. You could use a 'scope as well, just to make
LH> sure.
OK, I set up frequency in simulator correctly and run the code, but I get
some strange values in 'stop watch' field,, they are not what I expect. I'm
doing the following steps:
1) set breakpoint
2) run (F5)
2) upon reaching breakpoint I zero'd the 'stop-watch' value (right click and
choose reset)
3) press F5 again
4) see 'stop watch' value
With best regards, Roman Mashak. E-mail: mrv@tusur.ru |
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