AVR-Chat

I modify your previous code from counter0 to counter2, but it still
fails to use the real time clock.  Can anyone give me a hand?

Many thanks to wbounce


>   TIFR  |= BV(OCIE2);
>   TIMSK |= BV(OCIE2);    /* enable output compare interrupt */
>   ASSR  |= BV(AS2);      /* use asynchronous clock source */
>   TCNT2  = 0;
>   OCR2   = MS_OCRMATCH;     /* non debug use 32 match in 0.9765625 ms */
>   TCCR2  = BV(WGM21) | BV(CS20); /* CTC, no prescale */
>   
>   while (ASSR & 0x07)
>     ;
> 
> Then I use a interupt routine 
> 
>  */
> SIGNAL(SIG_OUTPUT_COMPARE2)
> {
> ms_count++;
> }
> 




--- In AVR-Chat@yahoogroups.com, "wbounce" <wbounce@s...> wrote:
> Here is some code for initializing timer0 
> 
>   /*
>    * Initialize timer0 to use the 32.768 kHz real-time clock crystal
>    * attached to TOSC1 & 2.  Enable output compare interrupt and set
>    * the output compare register to 32 which will cause an interrupt
>    * to be generated every 0.9765625 milliseconds - close enough to a
>    * millisecond. 
>    */
>   TIFR  |= BV(OCIE0);
>   TIMSK |= BV(OCIE0);    /* enable output compare interrupt */
>   ASSR  |= BV(AS0);      /* use asynchronous clock source */
>   TCNT0  = 0;
>   OCR0   = MS_OCRMATCH;     /* non debug use 32 match in 0.9765625 ms */
>   TCCR0  = BV(WGM01) | BV(CS00); /* CTC, no prescale */
>   
>   while (ASSR & 0x07)
>     ;
> 
> Then I use a interupt routine 
> 
>  */
> SIGNAL(SIG_OUTPUT_COMPARE0)
> {
> ms_count++;
> }
> 
> 
> 
> -----Original Message-----
> From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On
> Behalf Of ttse7
> Sent: Monday, May 30, 2005 4:38 AM
> To: AVR-Chat@yahoogroups.com
> Subject: [AVR-Chat] Atmega16 Real time clock
> 
> 
> Hi all,
> 
> I cannot turn on the real time clock of atmega16, I am sure I put the
> 32K crystal at TOSC1 and TOSC2, here is a portion of my source code:
> 
> ....
> ASSR |= _BV(AS2);
> TCCR2 =0x05;
> TCNT2 =0x00;
> ....
> sei();
> 
> Can anyone help? Many thanks
> 
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