// Copyright 2006 Yamane Akira
//ICC-AVR 
// Target : M48
// Crystal: 1.0000Mhz
// Fast PWM Example Program
// PD6->500uS low Pulse
// PD5->300uS low Pulse
// PB0->Start of Cycle 

#include <iom48v.h>
#include <macros.h>

void port_init(void)
{
 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0x7F; //m103 output only
 DDRC  = 0x00;
 PORTD = 0xFF;
 DDRD  = 0x60;
}

//TIMER0 initialize - prescale:64
// WGM: PWM Fast
// desired value: 16mSec
// actual value: 16.384mSec (-2.4%)
void timer0_init(void)
{
 TCCR0B = 0x00; //stop
 TCNT0 = 0x01; //set count
 OCR0A = 0xC1;
 OCR0B = 0xDB;
 TCCR0A = 0xA3; // 
 TCCR0B = 0x02; //start timer
}

#pragma interrupt_handler timer0_ovf_isr:17
void timer0_ovf_isr(void)
{
 PORTB ^=0x01;
}

//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;
 EICRA = 0x00; //extended ext ints
 EIMSK = 0x00;
 
 TIMSK0 = 0x01; //timer 0 interrupt sources
 TIMSK1 = 0x00; //timer 1 interrupt sources
 TIMSK2 = 0x00; //timer 2 interrupt sources
 
 PCMSK0 = 0x00; //pin change mask 0 
 PCMSK1 = 0x00; //pin change mask 1 
 PCMSK2 = 0x00; //pin change mask 2
 PCICR = 0x00; //pin change enable 
 PRR = 0x00; //power controller
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

//
void main(void)
{
 init_devices();
  while(1)
   ;
}