roboforum.ru

//ICC-AVR application builder : 04.12.2005 18:35:13
// Target : 2313
// Crystal: 1.0000Mhz

#include <io2313v.h>
#include <macros.h>

void port_init(void)
{
 PORTB = 0x80;
 DDRB  = 0x80; 
 PORTD = 0x00;
 DDRD  = 0x00; 
}

//TIMER0 initialize - prescale:1024
// desired value: 4Hz
// actual value:  4,002Hz (0,1%)
void timer0_init(void)
{
 TCCR0 = 0x00; //stop timer
 TCNT0 = 0x0C; //set count
 TCCR0 = 0x05; //start timer
}

#pragma interrupt_handler timer0_ovf_isr:7
void timer0_ovf_isr(void)
{
 PORTB ^=BIT(7);
 TCNT0 = 0x0C; //reload counter value
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer0_init();

 MCUCR = 0x00;
 GIMSK = 0x00;
 TIMSK = 0x02;
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

//
void main(void)
{
 init_devices();
 //insert your functional code here...
}