/*This program is used to test prototype board 
that blinks the LEDs on PORTB every second on a 
Mega32 MCU*/

#include <mega32.h>     
#include <stdio.h>
#include <stdlib.h>

#define begin {
#define end }

// Declare your global variables here
unsigned char reload;
unsigned int time0;
   
//**********************************************************
//timer 0 overflow ISR
interrupt [TIM0_OVF] void timer0_overflow(void)
begin
   //reload to force 1 mSec overflow
   TCNT0=reload;
   //clear the flag, task1 should be executed
   time0++;
end   
     
//**********************************************************
void initialize(void)
{
	//output LED
	DDRB=0xff;
	PORTB=0xff;

	// Timer/Counter 0 initialization
	time0=0;
	reload=256-125;
	TCCR0=0x03 ;
	TCNT0=reload;
	TIMSK=1;
	OCR0=0x00;
   
     #asm ("sei");
 

}
 
void main(void)
{
      initialize();    
   
      while (1)
      {   	       
    
     	 if (time0==2000) 
     	 {               
     	    PORTB=~PORTB;
     	    time0=0;
     	 }  
      }                 
}