AVR-Chat

Hi all,

First of all, I really double check that crystal 32.768K is plugged
between PC7 and PC6.  

Previously I did ont put the printf statement in the overflow function. 

Actually, I put a variable inside the overflow2 function, every time
overflow occurs, the counter increases by 1.  Then the main function
keeps sending out the content of that counter.  But I find the counter
did not increase at all.  Even I adjust the overflow period.  Then I
add one printf statement inside the overflow function to see what
happen.  Even I put the printf statement in the main loop.  The
counter remains the same.  I think the problem is relates to the timer
initialization.  If the cross out the statement 
ASSR|=BV(AS2), every thing is OK.  Where I put printf statement do not
affect the program.  It makes me belive the problem is comes from the
timer initialization.  So my original post just presents my timer
initialization.

Many experts here point out the problem of printf.  It is really good
I learn a lot.  Wbounce, I apologize if my wording is strong.

Once again, I really thank your kindly suggestions on it. I think I
better voice out my needs here again:

"Is anyone has any sucessful experience in using Atmega16 together
with real time clock. Please share with me."

The purpose of last message is just to get everyone on topic.



--- In AVR-Chat@yahoogroups.com, Brian Dean <bsd@b...> wrote:
> On Fri, Jun 03, 2005 at 02:01:29AM -0000, ttse7 wrote:
> 
> > I really want to get back my question but not other stuffs,i.e. turn
> > on the real time clock.  Really thanks to those reply and offer help
> > in this forum.
> 
> As wbounce suggested, please let us know that you actually have an
> actual RTC crystal connected to the TOSC1 and TOSC2 lines of your
> controller (PORTC6 and PORTC7).  Oh, and double check that you don't
> initalized those pins for output or something.  Without an actual
> second crystal on those pins, there's no chance of the timer working
> in asynchronous mode.
> 
> -Brian
> -- 
> Brian Dean
> BDMICRO - ATmega128 Based MAVRIC Controllers
> http://www.bdmicro.com/