// Copyright 2006 Yamane Akira
//ICC-AVR application builder : 2005/09/13 13:28:55
// Target : M8
// Crystal: 4.0000Mhz

#include <iom8v.h>
#include <macros.h>

  unsigned char SW_ON;

void port_init(void)
{
 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0x7F; //m103 output only
 DDRC  = 0x00;
 PORTD = 0xFF;
 DDRD  = 0x00;
}

//TIMER0 initialize - prescale:1024
// desired value: 20mSec
// actual value:  19.964mSec (0.2%)
void timer0_init(void)
{
 TCCR0 = 0x00; //stop
 GICR = 0x00; // Int0 Disabled
}

#pragma interrupt_handler timer0_ovf_isr:10
void timer0_ovf_isr(void)
{
	TCNT0 = 0xB2; //reload counter value
	SW_ON = 0x00;
   if ((PIND & 0x04)==0)
	  {
	   SW_ON++;   
	  }
	     else 
		   {
		    SW_ON = 0xFF;
	        GICR = 0x40;
			TCCR0 = 0x00;
	       }	 
}

#pragma interrupt_handler int0_isr:2
void int0_isr(void)
{
 GICR = 0x00;   // INT0 Disabled
 TCNT0 = 0xD9;  // 10ms TCNT0 Start Value
 TCCR0 = 0x05;  
   SW_ON = 0;
}

//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;
 GICR  = 0x40;
 TIMSK = 0x01; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

//
void main(void)
{
  unsigned char i;
 init_devices();
 
   SW_ON=0;
   PORTB = ~0x00;
   i = 0x00;
  while(1)
    {
	 MCUCR = 0x80; // Sleep Enable, Idle Mode
	 asm("sleep\n");
	   if (SW_ON ==0x00)
	      {
		   i++;
           PORTB = ~i;
		  }
	}
}