Re: [avr-gcc-list] hi guys a new bie having prob with IAR format

[Bjarne Laursen]

gaurav ajwani wrote:

> hi,
>  
You have some data in flash, you will need to study how to do that in 
avr-gcc
<>

> extern char __hugeflash *packed;


It appear that timer/counter 3 is set up to generate interrupts with 
some interval,

>  
>  // Timer/Counter 3 to CTC mode 
>  TCCR3B = (1<<WGM32) | (0<<CS12) | (0<<CS11) |
> (1<<CS10); 
>  // Count to 4*0x1FF -> 7.8125 KHz freq.
>  OCR3A = 0x1FF * 4;
>  // Reset counter
>  TCNT3 = 0;
>  // Enable Output Compare Match A Interrupt on TC3
>  ETIMSK |= (1<<OCIE3A); 
> }
>  

This is how IAR would declare the interrupt, you will need to study how 
to do that in avr-gcc

> #pragma vector = TIMER3_COMPA_vect
> __interrupt void TIMER3_COMPA(void)
> {
>  

> i m not able to figure out what is TCNT3,16bit in
> atmeg128, doing in this particular code
>  
You will probaly also need to study the theory behind the code.

-Bjarne