AVR-Chat

--- In AVR-Chat@yahoogroups.com, "Andrew" <ajellisuk@...> wrote:
>
> Hi,
> 
> I have a project using an Atmega16 where the timer should be interrupting once a second, but my sconds variable in not being incremented. If I use this line:
> 
> PORTD = ~PORTD;
See: http://www.atmel.com/dyn/resources/prod_documents/doc2466.pdf
Figure 23 for help

> 
> The leds connected to that port flash, if I write my seconds variable to that port only bianry one is indicated, whcih suggests to me that the timer is not running or the firmware is being reset.
> 
> Could someone shed some light on this for me please? I have disabled the watch dog timer too My code is below:

What is your compiler ?

> 
> Andrew
> 
> const uint16_t interval = 4000000/65536;//Work out interval from CPU frequency
> 
> void Init_Timer1()
> {
> 	// Set up counter.  Fclk = 4Mz
> 	TCCR1B = 1 << WGM12 | 1 << CS12;	// Fclk / 256, clear on match
> 	OCR1A  = interval;				// Timer ticks at 4000000/(256*interval) (1s)	
> 	TIMSK  |= (1 << OCIE1A | 1 << TOIE1);
> 	asm("sei");
> }
> 
> ISR(TIMER1_COMPA_vect)
> {	
> 	wdt_reset();
> 	power_save_timer++;
> 	seconds = seconds+1;
> 	PORTD = seconds << 2;// Used to verify timer is running	
> 
> 	if (seconds>59)
> 	{
> 		seconds=0;
> 		minutes++;
> 	}
> 		
> 	if(minutes>59)
> 	{
> 		minutes=0;
> 		hours++;
> 	}
> 
> 	if(hours>23) hours=0;
> }
>