AVR-Chat

Richard,

I have not programmed a 'mega32, but have used the 16 bit timer on the
tiny2313. It appears that you are incorrectly programming the timer as
an 8 bit timer. Timer1 is 16 bits. This may be your problem (or I may
be way off base).

Best regards,

Paul H.

--- In AVR-Chat@yahoogroups.com, "rlrsmith" <rlrsmith@y...> wrote:
> 
> Having a problem with the Compare Output functions in Timer1 on an 
> ATMega32.
> Have simulated the code under AVRStudio with various combinations of 
> the top 4 bits of the TCCR1A register - the code only appears to 
> affect the PIND register rather than the PORTD register.  I can't 
> spot the deliberate mistake - can anyone else help?
> 
> Thanks,
> 
> Richard Smith
> rlrsmith@y...
> 
> Code listing below:
> 
> #include <avr/io.h>
> #include <avr/interrupt.h>
> #include <avr/signal.h>
> 
> INTERRUPT(SIG_OUTPUT_COMPARE1A)
> {
> }
> 
> INTERRUPT(SIG_OUTPUT_COMPARE1B)
> {
> }
> 
> int main(void)
> {
> 	DDRD=0xFF;
> 	PORTD = 0xFF;
> 	
> 	//Reset counter
> 	TCNT1 = 0;
> 
> 	//Initiate timers
> 	TCCR1A = 0b10101100;	//See pg.105
> 	TCCR1B = 0b00000000;	//See pg.105
> 
> 	//Clear output compare interrupt flags
> 	TIFR = (_BV(OCF1A)|_BV(OCF1B));	//See pg. 111
> 	
> 	//Enable output compare interrupts
> 	TIMSK = (_BV(OCIE1A)|_BV(OCIE1B));	//See pg. 110
> 	
> 	OCR1A = 0x00FF;
> 	OCR1B = 0x000F;
> 	
> 	// Start timer
> 	TCCR1B |= 0b00000010;
> 	
> 	sei();
> 	for(;;);
> }